Delphi Indy sending email - delphi

I have a problem with sending a mail with Indy. The message is a cyrillic and there is a also a file attached to the mail but the when I send the file in the received email there is no file attached. Only some strange symbols. I googled all the information for Indy but nothing wasn't useful.
My question is how to send a message with file attached to it in cyrillic?
Thanks in advance!

Here's my emailer code unit. Hope it helps:
// ****************************************************
// Mass Emailer v1.0
//
// by: Steve Faleiro email: steve_goa#yahoo.com
// date: 14 Apr 2009
//
// Special thanks / dedications to:
// Remy Lebau of Team Indy,
// Nick Hodges of Codegear,
// Andy (Andreas Hausladen),
// & the JEDI JVCL project.
// ****************************************************
unit u_functions;
interface
uses SysUtils, Classes, IDMessageBuilder, Forms, StrUtils,
IDMessage, IDSmtp, IdSSLOpenSSL, IdExplicitTLSClientServerBase,
Windows, StdCtrls, DB, dialogs, ShellAPI;
type
smtpserverdetails = record
Host: string; // 'smtp.gmail.com';
Port: integer; // 465;
needAuthentication: string; // Y or N
secureMode: string; // Y or N
Username: string; // 'xx#gmail.com';
Password: string; // 'pp';
end;
type
TEmailMessageType = (HTMLMessage, PlainTextMessage);
type
emailmessage = record
EmailMessageType: TEmailMessageType;
FromAddress: string;
FromName: string;
ReplyToAddress: string;
ReplyToName: string;
ReceiptRecipientAddress: string;
ReceiptRecipientName: string;
RecipientAddress: string;
MsgSubject: string;
MsgBody: TMemoryStream;
Footer: TMemoryStream;
HTMLImages: TStringList;
Attachmnts: TStringList;
procedure copyTo(var dst: emailmessage);
constructor Create(Sender: TObject);
procedure Destroy;
end;
type
substList = record
findList: TStringList;
replaceList: TStringList;
end;
type
emailSender = class
constructor Create(srvr: smtpserverdetails);
procedure setEmail(emlmessg: emailmessage);
procedure customizeEmail(emlmessg: emailmessage; replaceables: substList);
procedure sendEmail;
destructor Destroy; override;
private
IDSMTP1: TIDSmtp;
IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL;
IDMessage1: TIDMessage;
FEmlMsg: emailmessage;
public
end;
procedure DeleteFileToRecycleBin(f: String);
procedure delAllFiles(d: string);
procedure getAllFileNames(d: string; out lstfn: TStringList);
function IsNumeric(const s: string): boolean;
function quotedString(s: string; c: Char): string;
procedure populateComboBox(c: TComboBox; ds: TDataSet;
KeyColumnIndex, DisplayColumnIndex: integer); overload;
procedure populateComboBox(c: TComboBox; sl: TStrings); overload;
procedure disposeComboBoxObjects(c: TComboBox);
procedure disposeStringListObjects(c: TStringList);
procedure disposeListBoxObjects(l: TListBox);
procedure populateListBox(l: TListBox; ds: TDataSet; KeyColumnIndex, DisplayColumnIndex: integer);
implementation
procedure DeleteFileToRecycleBin(f: String);
var
FileOpStruc: TSHFileOpStruct;
begin
FillChar(FileOpStruc, SizeOf(FileOpStruc), 0);
with FileOpStruc do begin
Wnd := 0;
wFunc := FO_DELETE;
pFrom := PChar(f + #0);
fFlags := FOF_ALLOWUNDO or FOF_NOCONFIRMATION or FOF_SILENT;
end;
try
SHFileOperation(FileOpStruc);
except
on E: Exception do
showmessage('Error!' + e.Message);
end;
end;
procedure emailmessage.copyTo(var dst: emailmessage);
begin
dst.EmailMessageType := EmailMessageType;
dst.FromName := FromName;
dst.FromAddress := FromAddress;
dst.ReplyToAddress := ReplyToAddress;
dst.ReplyToName := ReplyToName;
dst.ReceiptRecipientAddress := ReceiptRecipientAddress;
dst.ReceiptRecipientName := ReceiptRecipientName;
dst.RecipientAddress := RecipientAddress;
dst.MsgSubject := MsgSubject;
dst.HTMLImages.Assign(HTMLImages);
dst.Attachmnts.Assign(Attachmnts);
MsgBody.Position := 0;
dst.MsgBody.LoadFromStream(MsgBody);
if Assigned(Footer) then begin
Footer.Position := 0;
dst.Footer.LoadFromStream(Footer);
end;
end;
constructor emailmessage.Create(Sender: TObject);
begin
MsgBody := TMemoryStream.Create;
Footer := TMemoryStream.Create;
HTMLImages := TStringList.Create;
Attachmnts := TStringList.Create;
end;
procedure emailmessage.Destroy;
begin
MsgBody.Free;
Footer.Free;
HTMLImages.Free;
Attachmnts.Free;
end;
constructor emailSender.Create(srvr: smtpserverdetails);
begin
IDSMTP1 := TIDSMTP.Create;
IdSSLIOHandlerSocketOpenSSL1 := TIdSSLIOHandlerSocketOpenSSL.Create;
with IDSMTP1 do begin
Host := srvr.Host;
Port := srvr.Port;
if (srvr.needAuthentication = 'Y') then
AuthType := satDefault
else
AuthType := satNone;
IOHandler := IdSSLIOHandlerSocketOpenSSL1;
if (srvr.secureMode = 'Y') then
UseTLS := utUseRequireTLS
else
UseTLS := utNoTLSSupport;
Username := srvr.Username;
Password := srvr.Password;
end;
FEmlMsg.Create(nil);
end;
destructor emailSender.Destroy;
begin
FEmlMsg.Destroy;
IdSSLIOHandlerSocketOpenSSL1.Free;
IDSMTP1.Free;
inherited Destroy;
end;
//Author: Steve Faleiro. June 21, 2008.
procedure emailSender.customizeEmail(emlmessg: emailmessage; replaceables: substList);
var
buffer: pointer;
begin
emlmessg.copyTo(FEmlMsg);
//move to last position and insert Email signature
if Assigned(FEmlMsg.Footer) then //only if footer is populated
begin
getmem(buffer, FEmlMsg.Footer.size);
FEmlMsg.footer.Write(buffer, FEmlMsg.footer.size);
FEmlMsg.MsgBody.seek(0, soFromEnd);
FEmlMsg.MsgBody.Read(buffer, FEmlMsg.footer.size);
end;
// ReplaceData(emlmsg.MsgBody, replaceables);
FEmlMsg.MsgBody.Position := 0;
end;
procedure ReplaceData(Data: TStringList; replaceables: substList);
var
i, d: integer;
s: string;
begin
for i := 0 to Data.Count - 1 do begin
s := Data[i];
for d := 0 to replaceables.FindList.Count - 1 do
s := StringReplace(s, replaceables.FindList[d], replaceables.replaceList[d], [rfReplaceAll]);
Data[i] := s;
end;
end;
//Author: Steve Faleiro. June 21, 2008.
procedure emailSender.sendEmail;
var
idMBHTML: TIdMessageBuilderHTML;
c: integer;
pic, tempPath: string;
enc: TEncoding;
begin
idMBHTML := TIdMessageBuilderHTML.Create;
tempPath := extractfilepath(application.exename) + 'temp';
if not DirectoryExists(tempPath) then begin
if not CreateDir(tempPath) then
exit//showmessage('error');
;
end
else //directory exists
delAllFiles(tempPath);
FEmlMsg.MsgBody.Position := 0;
Idmessage1 := TIDMessage.Create;
with idMBHTML do begin
if (FEmlMsg.EmailMessageType = HTMLMessage) then begin
// enc := nil;
// TEncoding.GetBufferEncoding(FEmlMsg.MsgBody.Memory, enc) ;
enc := TEncoding.Unicode;
HTML.LoadFromStream(FEmlMsg.MsgBody, enc);
// showmessage(Html.Text);
// for c := 0 to FEmlMsg.HTMLImages.Count - 1 do
// HTMLFiles.Add(FEmlMsg.HTMLImages.Strings[c])//
// pic := FEmlMsg.HTMLImages.Strings[c];
// HTML.Text := ReplaceStr(HTML.Text, pic, 'cid:' + pic);
//// showmessage(Html.Text);
end
else
if (FEmlMsg.EmailMessageType = PlainTextMessage) then
PlainText.LoadFromStream(FEmlMsg.MsgBody);
for c := 0 to FEmlMsg.Attachmnts.Count - 1 do
Attachments.Add(FEmlMsg.Attachmnts[c]);
FillMessage(IDMessage1);
end;
with Idmessage1 do begin
Subject := FEmlMsg.MsgSubject;
From.Address := FEmlMsg.FromAddress;
From.Name := FEmlMsg.FromName;
Recipients.EMailAddresses := FEmlMsg.RecipientAddress;
if FEmlMsg.ReceiptRecipientAddress <> '' then
ReceiptRecipient.Address := FEmlMsg.ReceiptRecipientAddress;
if FEmlMsg.ReceiptRecipientName <> '' then
ReceiptRecipient.Name := FEmlMsg.ReceiptRecipientName;
end;
with IDSMTP1 do begin
if not Connected then
Connect;
Send(IdMessage1);
end;
Idmessage1.Free;
idMBHTML.Free;
end;
procedure emailSender.setEmail(emlmessg: emailmessage);
begin
emlmessg.copyTo(FEmlMsg);
end;
function quotedString(s: string; c: Char): string;
begin
Result := c + s + c;
end;
procedure delAllFiles(d: string);
var
fr: TSearchRec;
searchResult: integer;
begin
searchResult := FindFirst(Pansichar(d + '\*.*'), 0, fr);
if (searchResult = 0) then
repeat
DeleteFile(Pchar(d + '\' + fr.Name))
until (FindNext(fr) <> 0);
SysUtils.FindClose(fr);
end;
procedure getAllFileNames(d: string; out lstfn: TStringList);
var
fr: TSearchRec;
searchResult: integer;
begin
searchResult := FindFirst(d + '\*.*', 0, fr);
if (searchResult = 0) then
repeat
lstfn.Add(d + '\' + fr.Name)
until (FindNext(fr) <> 0);
SysUtils.FindClose(fr);
end;
function IsNumeric(const s: string): boolean;
var
v: single;
code: integer;
begin
Val(s, v, code);
Result := code = 0;
end;
function countWords(s: string): integer;
var
l, p, o: integer;
begin
l := Length(s);
if l = 0 then begin
Result := 0;
exit;
end;
o := 1;
for p := 0 to l - 1 do
if s[p] = ' ' then
Inc(o);
Result := o;
end;
function getWord(s: string; n: integer): string;
var
c, p, o: integer;
begin
p := 0;
for c := 0 to n do begin
o := p + 1;
p := PosEx(' ', s, p + 1);
if p = 0 then
p := Length(s) + 1;
end;
s := MidStr(s, o, p - o);
Result := s;
end;
// ---- Populate a Combobox ---------------------------------------------
// ---- for accessing the value, use:
// var
// s : PVariant;
// begin
// s := PVariant( lstServers.Items.Objects[lstServers.ItemIndex] );
// my_key := integer( s ^ ); // <--- cast to your type
// ---------------------------------------------------------------------
procedure populateComboBox(c: TComboBox; ds: TDataSet;
KeyColumnIndex, DisplayColumnIndex: integer);
var
v: variant;
pt: PVariant;
begin
disposeComboBoxObjects(c);
c.Items.Clear;
with ds do begin
First;
while not EOF do begin
v := Fields[KeyColumnIndex].Value;
New(pt);
pt ^ := v;
c.Items.AddObject(Fields[DisplayColumnIndex].AsString, TObject(pt));
Next;
end;
end;
if c.Items.Count > 0 then
c.ItemIndex := 0;
end;
// ---- Populate a Combobox ---------------------------------------------
// ---- for accessing the value, use:
// var
// s : PVariant;
// begin
// s := PVariant( lstServers.Items.Objects[lstServers.ItemIndex] );
// my_key := integer( s ^ ); // <--- cast to your type
// ---------------------------------------------------------------------
procedure populateComboBox(c: TComboBox; sl: TStrings);
var
v: variant;
pt: PVariant;
l: integer;
begin
disposeComboBoxObjects(c);
c.Items.Clear;
for l := 0 to sl.Count - 1 do begin
v := sl.ValueFromIndex[l];
New(pt);
pt ^ := v;
c.Items.AddObject(sl.Names[l], TObject(pt));
end;
if c.Items.Count > 0 then
c.ItemIndex := 0;
end;
// ---- Populate a Listbox ---------------------------------------------
// ---- for accessing the value, use:
// var
// s : PVariant;
// begin
// s := PVariant( lstServers.Items.Objects[lstServers.ItemIndex] );
// my_key := integer( s ^ ); // <--- cast to your type
// ---------------------------------------------------------------------
procedure populateListBox(l: TListBox; ds: TDataSet; KeyColumnIndex, DisplayColumnIndex: integer);
var
v: variant;
pt: PVariant;
begin
disposeListBoxObjects(l);
l.Items.Clear;
with ds do begin
First;
while not EOF do begin
v := Fields[KeyColumnIndex].Value;
New(pt);
pt ^ := v;
l.Items.AddObject(Fields[DisplayColumnIndex].AsString, TObject(pt));
Next;
end;
end;
if l.Items.Count > 0 then
l.ItemIndex := 0;
end;
procedure disposeComboBoxObjects(c: TComboBox);
var
i: integer;
begin
if c.Items.Count > 0 then
for i := 0 to c.Items.Count - 1 do
Dispose(PVariant(c.Items.Objects[i]));
end;
procedure disposeStringListObjects(c: TStringList);
var
i: integer;
begin
if c.Count > 0 then
for i := 0 to c.Count - 1 do
Dispose(PVariant(c.Objects[i]));
end;
procedure disposeListBoxObjects(l: TListBox);
var
i: integer;
begin
if l.Items.Count > 0 then
for i := 0 to l.Items.Count - 1 do
Dispose(PVariant(l.Items.Objects[i]));
end;
end.

Related

From checklistbox to tcxchecklistbox (save states to TMemoryStream)

Anyone can help how can I transform this to work with tcxchecklistbox?
My Save procedure looks like...
procedure Tfrm_A.SaveCheckListBoxData(S: TMemoryStream;
CheckListBox: TCheckListBox);
var
i: longint;
b: boolean;
buf : string;
begin
S.Clear;
buf := CheckListBox.Items.Text;
i := Length(buf);
S.Write(i, SizeOf(i));
if i > 0 then begin
S.Write(buf[1], i);
for i:= 0 to Pred(CheckListBox.Items.Count) do
begin
b:= CheckListBox.Checked[i];
s.Write(b,1);
end;
end;
end;
My load procedure looks like...
procedure Tfrm_A.LoadCheckListBoxData(S: TMemoryStream;
CheckListBox: TChecklistBox);
var
i: longint;
b: Boolean;
buf : string;
begin
S.Position := 0;
S.Read(i, SizeOf(i));
if i > 0 then begin
SetLength(buf, i);
S.Read(buf[1], i);
CheckListBox.Items.Text := buf;
for i:= 0 to Pred(CheckListBox.Items.Count) do
begin
s.Read(b,1);
CheckListBox.Checked[i] := b;
end;
end;
end;
My problem is
buf := CheckListBox.Items.Text;
TcxChecklistbox has checklistbox.items[Index].textproperty
Thanks for the help!
You can use a TStringStream to do this. Basically, it's just a question of iterating the cxCheckBoxList Items and writing a character to the StringStream indicating whether the checkbox is checked, and then reading the stream back a character at a time.
function StateToString(Checked : Boolean) : String;
begin
if Checked then
Result := '+'
else
Result := '-';
end;
procedure TForm1.SaveStatesToStream(SS : TStringStream);
var
i : integer;
begin
SS.Clear;
SS.Position := 0;
for i := 0 to cxCheckListBox1.Items.Count - 1 do begin
SS.WriteString(StateToString(cxCheckListBox1.Items[i].Checked));
end;
Memo1.Lines.Add('>' + SS.DataString + '<');
end;
procedure TForm1.LoadStatesFromStream(SS : TStringStream);
var
i : integer;
S : String;
begin
CheckBoxList.ClearCheckmarks;
SS.Position := 0;
i := 0;
while (i <= cxCheckListBox1.Items.Count - 1) and (SS.Position < SS.Size) do begin
S := SS.ReadString(1);
cxCheckListBox1.Items[i].Checked := S = '+';
Inc(i);
end;
end;
Tested in Delphi Seattle

How to disable CTRL ALT key on windows 7?

I know the only way to do that is to remap keys with regedit.
Have someone has done that with delphi ? (disable it and enable it again)
http://www.northcode.com/blog.php/2007/07/25/Securing-Windows-For-Use-As-A-Kiosk
The information in the article would translate to Delphi as follows:
uses
Registry;
const
DisableScancodes: packed array[0..11] of DWORD = (
$00000000, // version = 0
$00000000, // flags = 0
$00000009, // # of mappings = 9
$E05B0000, // disable Windows key
$E05C0000, // disable Windows key
$E05D0000, // disable Windows menu key
$00440000, // disable F10 key
$001D0000, // disable Left Ctrl key
$00380000, // disable Left Alt key
$E01D0000, // disable Right Ctrl key
$E0380000, // disable Right Alt key
$00000000 // end of list
);
var
Reg: TRegistry;
begin
Reg := TRegistry.Create(KEY_WRITE);
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
if Reg.OpenKey('\SYSTEM\CurrentControlSet\Control\Keyboard Layout', True) then
begin
try
// to enable the mapping
Reg.WriteBinaryData('Scancode Map', DisableScancodes, SizeOf(DisableScancodes));
// to disable the mapping
Reg.DeleteValue('Scancode Map');
finally
Reg.CloseKey;
end;
end;
finally
Reg.Free;
end;
end;
If you need to be more dynamic about which scancodes you enable/disable, you will have to use TRegistry.ReadBinaryData() to read the current Scancode Map value (if it exists), modify it as needed, and then save the changes using TRegistry.WriteBinaryData(). Try something like this:
unit ScanCodeMap;
interface
type
TMappedScancode = record
Scancode: WORD;
MappedTo: WORD;
end;
procedure AddScancodeMappings(const Values: array of TMappedScancode);
procedure AddScancodeMapping(const Value: TMappedScancode);
procedure AddScancodeMapping(Scancode, MappedTo: WORD);
procedure RemoveScancodeMappings(const Scancodes: array of WORD);
procedure RemoveScancodeMapping(Scancode: WORD);
procedure DisableScancodes(Scancodes: array of WORD);
procedure DisableScancode(Scancode: WORD);
implementation
uses
Windows, Registry;
type
PScancodeMapHdr = ^TScancodeMapHdr;
TScancodeMapHdr = packed record
Version: DWORD;
Flags: DWORD;
NumMappings: DWORD;
end;
TScancodeMap = record
Version: DWORD;
Flags: DWORD;
Mappings: array of TMappedScancode;
end;
procedure AddScancodesToMap(var Map: TScancodeMap; const Values: array of TMappedScancode);
var
I, J, Idx: Integer;
begin
for I := 0 to High(Values) do
begin
Idx := -1;
for J := 0 to High(Map.Mappings) do
begin
if Map.Mappings[J].Scancode = Values[I].Scancode then
begin
Idx := J;
Break;
end;
end;
if Idx = -1 then
begin
SetLength(Map.Mappings, Length(Map.Mappings)+1);
Idx := High(Map.Mappings);
end;
Map.Mappings[Idx].MappedTo := Values[I].MappedTo;
end;
end;
procedure RemoveScancodesFromMap(var Map: TScancodeMap; const Scancodes: array of WORD);
var
I, J: Integer;
begin
for I := 0 to High(Scancodes) do
begin
for J := 0 to High(Map.Mappings) do
begin
if Map.Mappings[J].Scancode = Scancodes[I] then
begin
if J < High(Map.Mappings) then
Move(Map.Mappings[J+1], Map.Mappings[J], (High(Mappings)-J) * SizeOf(TMappedScancode));
SetLength(Map.Mappings, Length(Map.Mappings)-1);
Break;
end;
end;
end;
end;
procedure WriteScanCodeMap(const Map: TScancodeMap);
var
Reg: TRegistry;
Data: array of Byte;
Tmp: PByte;
Hdr: PScancodeMapHdr;
I: Integer;
begin
if Length(Map.Mappings) > 0 then
begin
SetLength(Data, sizeof(TScancodeMapHdr) + (Length(Map.Mappings) + 1) * SizeOf(DWORD));
Tmp := PByte(Data);
Hdr := PScancodeMapHdr(Tmp);
Hdr.Version := Map.Version;
Hdr.Flags := Map.Flags;
Hdr.NumMappings := Length(Map.Mappings) + 1;
Inc(Tmp, SizeOf(TScancodeMapHdr));
for I := 0 to High(Map.Mappings) do
begin
PDWORD(Tmp)^ := (DWORD(Map.Mappings[0].Scancode) shr 16) or DWORD(Map.Mappings[0].MappedTo);
Inc(Tmp, SizeOf(DWORD));
end;
PDWORD(Tmp)^ := 0;
end;
Reg := TRegistry.Create(KEY_WRITE);
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
if Reg.OpenKey('\SYSTEM\CurrentControlSet\Control\Keyboard Layout', True) then
begin
try
if Length(Data) > 0 then
Reg.WriteBinaryData('Scancode Map', Data[0], Length(Data))
else
Reg.DeleteValue('Scancode Map');
finally
Reg.CloseKey;
end;
end;
finally
Reg.Free;
end;
end;
procedure ReadScanCodeMap(var Map: TScancodeMap);
var
Reg: TRegistry;
Size: Integer;
Data: array of Byte;
Tmp: PByte;
Hdr: PScancodeMapHdr;
I: Integer;
begin
Map.Version := 0;
Map.Flags := 0;
SetLength(Map.Mappings, 0);
Reg := TRegistry.Create;
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
if Reg.OpenKeyReadOnly('\SYSTEM\CurrentControlSet\Control\Keyboard Layout') then
begin
try
Size := Reg.GetDataSize('Scancode Map');
if Size > SizeOf(TScancodeMapHdr) then
begin
SetLength(Data, Size);
Reg.ReadBinaryData('Scancode Map', Data[0], Size);
Tmp := PByte(Data);
Hdr := PScancodeMapHdr(Tmp);
Map.Version := Hdr.Version;
Map.Flags := Hdr.Flags;
Inc(Tmp, SizeOf(TScancodeMapHdr));
if Hdr.NumMappings > 1 then
begin
SetLength(Map.Mappings, Hdr.NumMappings-1);
for I := 0 to High(Map.Mappings) do
begin
Map.Mappings[I].Scancode := HIWORD(PDWORD(Tmp)^);
Map.Mappings[I].MappedTo := LOWORD(PDWORD(Tmp)^);
end;
end;
end;
finally
Reg.CloseKey;
end;
end;
finally
Reg.Free;
end;
end;
procedure AddScancodeMappings(const Values: array of TMappedScancode);
var
Map: TScancodeMap;
begin
ReadScanCodeMap(Map);
AddScancodesToMap(Map, Values);
WriteScanCodeMap(Map);
end;
procedure AddScancodeMapping(const Value: TMappedScancode);
begin
AddScancodeMappings([Value]);
end;
procedure AddScancodeMapping(Scancode, MappedTo: WORD);
var
Value: array[0..0] of TMappedScancode;
begin
Value[0].Scancode := Scancode;
Value[0].MappedTo := MappedTo;
AddScancodeMappings([Value]);
end;
procedure RemoveScancodeMappings(const Scancodes: array of WORD);
var
Map: TScancodeMap;
begin
ReadScanCodeMap(Map);
RemoveScancodesFromMap(Map, Scancodes);
WriteScanCodeMap(Map);
end;
procedure RemoveScancodeMapping(Scancode: WORD);
begin
RemoveScancodeMappings([Scancode]);
end;
procedure DisableScancodes(Scancodes: array of WORD);
var
Values: array of TMappedScancode;
I: Integer;
begin
SetLength(Values, Length(Scancodes));
for I := 0 to High(Mappings) do
begin
Values[I].Scancode := Scancodes[I];
Values[I].MappedTo := $0000;
end;
AddScancodeMappings(Values);
end;
procedure DisableScancode(Scancode: WORD);
begin
AddScancodeMapping(Scancode, $0000);
end;
end.
Then you can do this:
uses
ScanCodeMap;
const
Scancodes: packed array[0..7] of WORD = (
$E05B, // Windows key
$E05C, // Windows key
$E05D, // Windows menu key
$0044, // F10 key
$001D, // Left Ctrl key
$0038, // Left Alt key
$E01D, // Right Ctrl key
$E038 // Right Alt key
);
procedure DisableCtrlAltDel;
begin
DisableScancodes(Scancodes);
end;
procedure EnableCtrlAltDel;
begin
RemoveScancodeMappings(Scancodes);
end;

Delphi 7 - Check if server is online

I have a program created in Delphi 7 that uses ftp downloading.
How can i insert into that program to check for a server status?
For example if server is online to produce a green image, if server is offline o produce a red image. Here is the code.
unit Download;
interface
uses
Classes, Wininet, Windows, SysUtils, Dialogs, Forms;
type
GFilesThread = class(TThread)
private
LTemp : Longword;
STemp : string;
FilesToGet : TStringList;
FilesSize : Longword;
CBackup : integer;
CRevision : integer;
CForceCheck : boolean;
CSwitch : integer;
UUrl : string;
USelfParam : string;
Dir: string;
FSource: TStream;
protected
procedure Execute; override;
procedure UpdateFileProgress;
procedure SetFileProgressMax;
procedure UpdateStatusLabel;
procedure UpdateFileDecompStat;
procedure UpdateFilesProgress;
procedure CheckFiles(FList : TStringList);
procedure BZProgress(Sender: TObject);
procedure LockFMain;
procedure UNLockFMain;
procedure GetFiles;
procedure SelfUpdate(SelfVal : string);
procedure UpdateRevision;
procedure ModHosts(Lines : TStringList);
procedure DoUncompressStream(ASource, ADest: TStream);
procedure DoUncompress(const ASource, ADest: TFileName);
function HTTPGetFile(const fileURL, FileName: string; sh_progress: boolean): boolean;
public
property CreateBackup : integer write CBackup;
property UpdatesUrl : string write UUrl;
property LocalRevision : integer write CRevision;
property ForceCheck : boolean write CForceCheck;
end;
implementation
uses Launcher, CheckFiles, BZip2, md5, FileList;
// -------- by 667
procedure GFilesThread.UpdateStatusLabel;
begin
FMain.Label3.Caption:=STemp;
end;
procedure GFilesThread.SetFileProgressMax;
begin
if(CSwitch=0) then
FMain.Gauge1.MaxValue:=LTemp;
if(CSwitch=1) then
FMain.Gauge2.MaxValue:=LTemp;
end;
procedure GFilesThread.UpdateFileProgress;
begin
FMain.Gauge1.Progress:=LTemp;
end;
procedure GFilesThread.UpdateFilesProgress;
begin
FMain.Gauge2.Progress:=LTemp;
end;
procedure GFilesThread.UpdateRevision;
begin
FMain.UpdateRevision(IntToStr(CRevision));
end;
procedure GFilesThread.UpdateFileDecompStat;
begin
FMain.Gauge1.Progress:=LTemp;
end;
procedure GFilesThread.BZProgress(Sender: TObject);
begin
LTemp:=FSource.Position;
Synchronize(UpdateFileDecompStat);
end;
procedure GFilesThread.LockFMain;
begin
Fmain.ImgBtn1.Visible:=False;
Fmain.ImgBtn2.Visible:=False;
Fmain.ImgBtn5.Enabled:=False;
end;
procedure GFilesThread.UNLockFMain;
begin
Fmain.ImgBtn1.Visible:=True;
Fmain.ImgBtn2.Visible:=True;
Fmain.ImgBtn5.Enabled:=True;
end;
// --------- by 667
function GFilesThread.HTTPGetFile(const fileURL, FileName: string; sh_progress: boolean): boolean;
const
BufferSize = 1024;
var
hSession, hURL: HInternet;
Buffer: array[1..BufferSize] of Byte;
BufferLen: Longword;
f: file;
sAppName: string;
begin
Result := False;
sAppName := 'L2ClientUpdater';
LTemp:=0;
hSession := InternetOpen(PChar(sAppName),
INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
try
hURL := InternetOpenURL(hSession, PChar(fileURL), nil, 0, 0, 0);
if (hURL <> nil) then begin
try
DeleteUrlCacheEntry(PChar(fileURL));
AssignFile(f, FileName);
Rewrite(f,1);
repeat
InternetReadFile(hURL, #Buffer, SizeOf(Buffer), BufferLen);
BlockWrite(f, Buffer, BufferLen);
if (sh_progress) then
begin
LTemp:=LTemp+BufferLen;
Synchronize(UpdateFileProgress);
end;
until
BufferLen = 0;
CloseFile(f);
Result := True;
finally
InternetCloseHandle(hURL);
end;
end;
finally
InternetCloseHandle(hSession);
end;
LTemp:=0;
Synchronize(UpdateFileProgress);
end;
procedure GFilesThread.DoUncompress(const ASource, ADest: TFileName);
var
Source, Dest: TStream;
begin
Source := TFileStream.Create(ASource, fmOpenRead + fmShareDenyWrite);
try
Dest := TFileStream.Create(ADest, fmCreate);
try
DoUncompressStream(Source, Dest);
finally
Dest.Free;
end;
finally
Source.Free;
DeleteFile(ASource);
end;
end;
procedure GFilesThread.DoUncompressStream(ASource, ADest: TStream);
const
BufferSize = 65536;
var
Count: Integer;
Decomp: TBZDecompressionStream;
Buffer: array[0..BufferSize - 1] of Byte;
begin
FSource := ASource;
LTemp:=FSource.Size;
CSwitch:=0;
Synchronize(SetFileProgressMax);
Decomp := TBZDecompressionStream.Create(ASource);
try
Decomp.OnProgress := BZProgress;
while True do
begin
Count := Decomp.Read(Buffer, BufferSize);
if Count <> 0 then ADest.WriteBuffer(Buffer, Count) else Break;
end;
finally
Decomp.Free;
FSource := nil;
LTemp:=0;
Synchronize(UpdateFileDecompStat);
end;
end;
procedure GFilesThread.CheckFiles(FList : TStringList);
var
i: integer;
FParam: TStringList;
FNameLocal: string;
begin
if(FList.Count>0) and (FList[0]<>'FAIL') and (not terminated) then
begin
STemp:='Checking files';
Synchronize(UpdateStatusLabel);
CSwitch:=1;
LTemp:=FList.Count-1;
Synchronize(SetFileProgressMax);
FParam:=TStringList.Create;
for i:=0 to FList.Count-1 do
begin
LTemp:=i;
Synchronize(UpdateFilesProgress);
FParam:=Tokenize(FList[i],'|');
FNameLocal:=Dir+FParam[2];
STemp:='Checking '+FParam[2];
Synchronize(UpdateStatusLabel);
if (not FileExists(FNameLocal)) then
begin
FilesToGet.Add(FList[i]);
FilesSize:=FilesSize+StrToInt(FParam[0]);
end
else
begin
if (MD5Print(MD5File(FNameLocal))<>FParam[1]) then
begin
FilesToGet.Add(FList[i]);
FilesSize:=FilesSize+StrToInt(FParam[0]);
end;
end;
end;
FParam.Free;
LTemp:=0;
Synchronize(UpdateFilesProgress);
STemp:='';
Synchronize(UpdateStatusLabel);
end;
end;
procedure GFilesThread.SelfUpdate(SelfVal : string);
var
FParam: TStringList;
FNameLocal: string;
F:boolean;
begin
if(SelfVal<>'') then
begin
FParam:=TStringList.Create;
FParam:=Tokenize(SelfVal,'|');
FNameLocal:=Dir+FParam[2];
if (MD5Print(MD5File(FNameLocal))<>FParam[1]) then
begin
FilesSize:=FilesSize+StrToInt(FParam[0]);
F:=HTTPGetFile(UUrl+FParam[2]+'.bz2',FNameLocal+'.bz2',True);
if(F) then begin
try
DoUncompress(FNameLocal+'.bz2',Dir+FParam[2]+'.New');
GenKillerBat(FParam[2]);
RunApp(Dir+'Update.bat');
except
STemp:='Update Failed';
DeleteFile(FNameLocal);
end;
end;
end;
FParam.Free;
end;
end;
procedure GFilesThread.ModHosts(Lines : TStringList);
var
Hosts : textfile;
H, HostsStrings, HostLineParam : TStringList;
HostsPath, temp : string;
i, z, funnyFlag : integer;
WindirP : PChar;
Res : cardinal;
begin
WinDirP := StrAlloc(MAX_PATH);
Res := GetWindowsDirectory(WinDirP, MAX_PATH);
if Res > 0 then
begin
if(FileExists(StrPas(WinDirP)+'\system32\drivers\etc\hosts.msn')) then
HostsPath := StrPas(WinDirP)+'\system32\drivers\etc\hosts.msn'
else
HostsPath := StrPas(WinDirP)+'\system32\drivers\etc\hosts';
AssignFile(Hosts,HostsPath);
Reset(Hosts);
HostsStrings:= TStringList.Create;
H:= TStringList.Create;
H.Add('#-------- Added by L2Updater --------');
while (not Eof(Hosts)) do
begin
ReadLn(Hosts, temp);
HostsStrings.Add(Trim(temp));
end ;
Reset(Hosts);
for i:=0 to Lines.Count-1 do
begin
funnyFlag:=0;
HostLineParam:=Tokenize(Lines[i],'|');
for z:=0 to HostsStrings.Count-1 do
begin
if (StrSearch(1,HostsStrings[z],HostLineParam[0])>0) and (HostsStrings[z][1]<>'#') then
begin
if (StrSearch(1,HostsStrings[z],HostLineParam[1]+#9)= 0) and (StrSearch(1,HostsStrings[z],HostLineParam[1]+' ')= 0 ) then
begin
HostsStrings[z]:= '#'+HostsStrings[z];
funnyFlag:=1;
end
else funnyFlag:=2;
end;
end;
if (funnyFlag=1) or (funnyFlag=0) then
H.Add(HostLineParam[1]+#9+HostLineParam[0]);
end;
H.Add('#-----------------');
if H.Count>2 then
begin
Rewrite(Hosts);
STemp:='Applying changes to Hosts';
Synchronize(UpdateStatusLabel);
for i:=0 to HostsStrings.Count-1 do
begin
WriteLn(Hosts,HostsStrings[i]);
end;
for i:=0 to H.Count-1 do
begin
WriteLn(Hosts,H[i]);
end;
STemp:='Hosts file chamged';
Synchronize(UpdateStatusLabel);
end;
H.Free; HostsStrings.Free; HostLineParam.Free;
CloseFile(Hosts);
end;
end;
procedure GFilesThread.GetFiles;
var
FParam : TStringList;
i : integer;
F, error : boolean;
LocalFile, BakFile: string;
begin
error := False;
if (FilesToGet.Count>0) then
begin
FParam:=TStringList.Create;
LTemp:=FilesToGet.Count-1;
CSwitch:=1;
Synchronize(SetFileProgressMax);
i:=0;
while (i < FilesToGet.Count) and (not terminated) do
begin
FParam:=Tokenize(FilesToGet[i],'|');
LocalFile:= Dir+FParam[2];
STemp:='Downloading '+ FParam[2];
Synchronize(UpdateStatusLabel);
CSwitch:=0;
LTemp:= StrToInt(FParam[0]);
Synchronize(SetFileProgressMax);
if (not DirectoryExists(ExtractFilePath(LocalFile))) then
ForceDirectories(ExtractFilePath(LocalFile));
F:=HTTPGetFile(UUrl+ReplaceStr(FParam[2],'\','/')+'.bz2',LocalFile+'.bz2',True);
if (F) then
begin
try
if (CBackup=1) then
begin
BakFile:=Dir+'backup\'+FParam[2];
if (not DirectoryExists(ExtractFilePath(BakFile))) then
ForceDirectories(ExtractFilePath(BakFile));
CopyFile(PChar(LocalFile),PChar(BakFile),false);
end;
STemp:='Extracting '+ FParam[2];
Synchronize(UpdateStatusLabel);
DoUncompress(LocalFile+'.bz2',Dir+FParam[2]);
except
STemp:='Update Failed';
error := True;
end;
end
else
begin
STemp:='Update Failed';
error := True;
Break;
end;
inc(i);
LTemp:=i;
CSwitch:=1;
Synchronize(UpdateFilesProgress);
end;
LTemp:=0;
Synchronize(UpdateFilesProgress);
FParam.Free;
if (not error) then
STemp:='All files have been updated.';
end
else STemp:='';
end;
procedure GFilesThread.Execute;
var
List: TListFile;
CFiles, NFiles, HostsLines : TStringList;
TRev, IsModHosts : integer;
F : boolean;
begin
Dir:=GetCurrentDir+'\';
FilesSize:=0;
Synchronize(LockFMain);
STemp:='Downloading updates list';
Synchronize(UpdateStatusLabel);
if(UUrl[length(UUrl)]<>'/') then UUrl:=UUrl+'/';
F:=HTTPGetFile(UUrl+'files.lst.bz2',Dir+'files.lst.bz2', True);
if (F) then
begin
STemp:='';
Synchronize(UpdateStatusLabel);
try
DoUncompress(Dir+'files.lst.bz2',Dir+'files.lst');
except
STemp:='Update Failed';
Synchronize(UpdateStatusLabel);
DeleteFile(Dir+'files.lst');
end;
if(FileExists(Dir+'files.lst')) then
begin
FilesToGet := TStringList.Create;
List := TListFile.Create(Dir+'files.lst');
CFiles:=TStringList.Create;
TRev:=StrToInt(List.GetKeyValue('settings','Rev'));
IsModHosts:=StrToInt(List.GetKeyValue('settings','ModHosts'));
if (IsModHosts = 1) then
begin
HostsLines:= TStringList.Create;
HostsLines:= List.GetFSection('hosts');
try
ModHosts(HostsLines);
finally
HostsLines.Free;
end;
end;
USelfParam:= List.GetFSection('self')[0];
if(USelfParam<>'FAIL') then SelfUpdate(USelfParam);
CFiles:=List.GetFSection('files_critical');
CheckFiles(CFiles);
CFiles.Free;
if (CForceCheck) or (TRev>CRevision) then
begin
if (CBackup=1) then
begin
DelDir(Dir+'backup');
MkDir(Dir+'backup');
end;
NFiles:=TStringList.Create;
NFiles:=List.GetFSection('files_normal');
CheckFiles(NFiles);
NFiles.Free;
end;
GetFiles;
List.Destroy;
FilesToGet.Free;
DeleteFile(Dir+'files.lst');
if TRev>CRevision then
begin
CRevision:=TRev;
Synchronize(UpdateRevision);
end;
end;
end
else
begin
STemp:='Update Failed';
DeleteFile(Dir+'files.lst');
end;
Synchronize(UpdateStatusLabel);
Synchronize(UNLockFMain);
end;
end.
function CanConnect(const aUserName, aPassword, aHost: String; out aErrm: string): boolean;
var
LocalIDFTP: TIdFTP;
begin
aErrm := '';
LocalIDFTP := TIdFTP.Create(nil);
try
LocalIDFTP.UserName := aUserName;
LocalIDFTP.Password := aPassword;
LocalIDFTP.Host := aHost;
LocalIDFTP.Passive := True;
try
LocalIDFTP.Connect;
LocalIDFTP.Quit;
result := true;
except
on E: Exception do
begin
aErrm := 'Unable to connect to FTP site: ' + E.Message;
Result := FALSE;
end;
end;
finally
if Assigned(LocalIDFTP) then
LocalIDFTP.Free
else
Result := FALSE;
end;
end; {CanConnect}

SendKeys from WM_HOTKEY handler

Have AppActivate and SendKeys functions.
When use: AppActivate('*WordPad'); SendKeys('Test");
this works fine - application activated and text pasted
but then use it from WM_HOTKEY handler from the same program,
this is not worked.
Any ideas?
procedure wm_hotkeyhandler(var Msg: TWMHotkey); message WM_HOTKEY;
...
procedure TFormMain.wm_hotkeyhandler(var Msg: TWMHotkey);
var
Pt: TPoint;
begin
inherited;
if (Msg.HotKey = HotKeyId_L) then SendKeys('Test'); // not pasted to active app
if (Msg.HotKey = HotKeyId_M) then begin
// invoke context menu and paste text after click to menu item, works fine
GetCursorPos(Pt);
popPaste.Popup(Pt.x, Pt.y);
end;
end;
Update 1:
// this code works fine
procedure TFormTest.btnAppActivateClick(Sender: TObject);
var
sTitle, sKeys: string;
begin
sTitle := '*WordPad';
sKeys := 'Hello{ENTER}World!';
AppActivate(sTitle);
SendKeys(PChar(sKeys), False);
end;
menu item handler (which invoked by hotkey HotKeyId_M):
procedure TFormMain.mnPasteLoginClick(Sender: TObject);
begin
SendKeys('Hello{ENTER}World!', False);
end;
hotkeys:
HotKeyId_L: Integer;
HotKeyId_M: Integer;
initialization of hotkeys:
HotKeyId_L := GlobalAddAtom('HotKeyL');
RegisterHotKey(Handle, HotKeyId_L, MOD_CONTROL + MOD_ALT, Byte('L'));
HotKeyId_M := GlobalAddAtom('HotKeyM');
RegisterHotKey(Handle, HotKeyId_L, MOD_CONTROL + MOD_ALT, Byte('M'));
Update 2: (full code for test)
unit Unit2;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, Menus;
type
TForm2 = class(TForm)
btnActivate: TButton;
popPopup: TPopupMenu;
Paste1: TMenuItem;
procedure btnActivateClick(Sender: TObject);
procedure Paste1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
HotKeyId_L: Integer;
HotKeyId_M: Integer;
procedure wm_hotkeyhandler(var Msg: TWMHotkey); message WM_HOTKEY;
public
{ Public declarations }
end;
var
Form2: TForm2;
implementation
{$R *.DFM}
type
TCompareDirection = (cdHead, cdTail, cdNone);
TWindowObj = class(TObject)
private
targetTitle : PChar;
compareLength: Integer;
FCompareDirection: TCompareDirection;
FWindowHandle: THandle;
public
constructor Create;
destructor Destroy; override;
function Equal(ATitle: PChar): Boolean;
function SetTitle(const Title: string ): Boolean;
property WindowHandle: THandle read FWindowHandle write FWindowHandle;
end;
function EnumWindowsProc(hWnd: HWND; lParam: LPARAM):Bool; export; stdcall;
var
WinObj: TWindowObj;
aWndName: array[0..MAX_PATH] of Char;
begin
Result := True;
WinObj := TWindowObj(lParam);
GetWindowText(hWnd, aWndName, MAX_PATH);
if WinObj.Equal(aWndName) then begin
WinObj.WindowHandle := hWnd;
Result := False; // Stop Enumerate
end;
end;
function GetWindowHandleByTitle(const Title: string): THandle;
var
WinObj: TWindowObj;
begin
Result := 0;
WinObj := TWindowObj.Create;
try
if WinObj.SetTitle(Title) then begin
EnumWindows(#EnumWindowsProc, Integer(WinObj));
Result := WinObj.WindowHandle;
end;
finally
WinObj.Free;
end;
end;
function AppActivate(const Title: string ): Boolean;
var
hWnd: THandle;
begin
hWnd := GetWindowHandleByTitle(Title);
Result := (hWnd > 0);
if Result then begin
SendMessage(hWnd, WM_SYSCOMMAND, SC_HOTKEY, hWnd);
SendMessage(hWnd, WM_SYSCOMMAND, SC_RESTORE, hWnd);
SetForegroundWindow(hWnd);
end;
end;
constructor TWindowObj.Create;
begin
TargetTitle := nil;
FWindowHandle := 0;
end;
destructor TWindowObj.Destroy;
begin
inherited Destroy;
if Assigned(TargetTitle) then
StrDispose(TargetTitle) ;
end;
function TWindowObj.Equal(ATitle: PChar): Boolean;
var
p : Pchar;
stringLength : integer;
begin
Result := False;
if (TargetTitle = nil) then
Exit;
case FCompareDirection of
cdHead: begin
if StrLIComp(ATitle, TargetTitle, compareLength) = 0 then
Result := True;
end;
cdTail: begin
stringLength := StrLen(ATitle);
p := #ATitle[stringLength - compareLength];
if (StrLIComp(p, Targettitle, compareLength) = 0) then
Result := True;
end;
cdNone: begin
Result := True;
end;
end;
end;
function TWindowObj.SetTitle(const Title: string ): Boolean;
var
pTitle, p: PChar;
begin
Result := False;
pTitle := StrAlloc(Length(Title) + 1);
StrPCopy(pTitle, Title);
p := StrScan(pTitle, '*');
if Assigned(p) then begin
if StrLen(pTitle) = 1 then begin {full matching }
FCompareDirection := cdNone;
compareLength := 0;
TargetTitle := nil;
StrDispose(pTitle);
end
else
if (p = pTitle) then begin {tail matching }
Inc(p);
if StrScan(p, '*') <> nil then begin
{MessageDlg( 'Please 1 wild char ', mtError, [mbOK],0 ); }
StrDispose( pTitle);
TargetTitle := nil;
FCompareDirection := cdNone;
Comparelength := 0;
exit;
end;
FCompareDirection := cdTail;
CompareLength := StrLen(PTitle) - 1;
TargetTitle := StrAlloc(StrLen(p) + 1 );
StrCopy(targetTitle, p);
StrDispose(PTitle);
end
else begin
p^ := #0;
FCompareDirection := cdHead;
CompareLength := Strlen( pTitle );
Targettitle := pTitle;
end;
end
else begin
FCompareDirection := cdHead;
compareLength := Strlen( pTitle );
TargetTitle := pTitle;
end;
Result := True;
end;
//========================================
// SendKeys
//
// Converts a string of characters and key names to keyboard events and passes them to Windows.
//
// Example syntax:
// SendKeys('abc123{left}{left}{left}def{end}456{left 6}ghi{end}789', True);
function SendKeys(SendStr: PChar; Wait: Boolean): Boolean;
type
WBytes = array[0..pred(SizeOf(Word))] of Byte;
TSendKey = record
Name : ShortString;
VKey : Byte;
end;
const
// Array of keys that SendKeys recognizes.
// If you add to this list, you must be sure to keep it sorted alphabetically
// by Name because a binary search routine is used to scan it.}
MaxSendKeyRecs = 41;
SendKeyRecs : array[1..MaxSendKeyRecs] of TSendKey = (
(Name:'BACKSPACE'; VKey:VK_BACK),
(Name:'BKSP'; VKey:VK_BACK),
(Name:'BREAK'; VKey:VK_CANCEL),
(Name:'BS'; VKey:VK_BACK),
(Name:'CAPSLOCK'; VKey:VK_CAPITAL),
(Name:'CLEAR'; VKey:VK_CLEAR),
(Name:'DEL'; VKey:VK_DELETE),
(Name:'DELETE'; VKey:VK_DELETE),
(Name:'DOWN'; VKey:VK_DOWN),
(Name:'END'; VKey:VK_END),
(Name:'ENTER'; VKey:VK_RETURN),
(Name:'ESC'; VKey:VK_ESCAPE),
(Name:'ESCAPE'; VKey:VK_ESCAPE),
(Name:'F1'; VKey:VK_F1),
(Name:'F10'; VKey:VK_F10),
(Name:'F11'; VKey:VK_F11),
(Name:'F12'; VKey:VK_F12),
(Name:'F13'; VKey:VK_F13),
(Name:'F14'; VKey:VK_F14),
(Name:'F15'; VKey:VK_F15),
(Name:'F16'; VKey:VK_F16),
(Name:'F2'; VKey:VK_F2),
(Name:'F3'; VKey:VK_F3),
(Name:'F4'; VKey:VK_F4),
(Name:'F5'; VKey:VK_F5),
(Name:'F6'; VKey:VK_F6),
(Name:'F7'; VKey:VK_F7),
(Name:'F8'; VKey:VK_F8),
(Name:'F9'; VKey:VK_F9),
(Name:'HELP'; VKey:VK_HELP),
(Name:'HOME'; VKey:VK_HOME),
(Name:'INS'; VKey:VK_INSERT),
(Name:'LEFT'; VKey:VK_LEFT),
(Name:'NUMLOCK'; VKey:VK_NUMLOCK),
(Name:'PGDN'; VKey:VK_NEXT),
(Name:'PGUP'; VKey:VK_PRIOR),
(Name:'PRTSC'; VKey:VK_PRINT),
(Name:'RIGHT'; VKey:VK_RIGHT),
(Name:'SCROLLLOCK'; VKey:VK_SCROLL),
(Name:'TAB'; VKey:VK_TAB),
(Name:'UP'; VKey:VK_UP)
);
{Extra VK constants missing from Delphi's Windows API interface}
VK_NULL=0;
VK_SemiColon=186;
VK_Equal=187;
VK_Comma=188;
VK_Minus=189;
VK_Period=190;
VK_Slash=191;
VK_BackQuote=192;
VK_LeftBracket=219;
VK_BackSlash=220;
VK_RightBracket=221;
VK_Quote=222;
VK_Last=VK_Quote;
ExtendedVKeys : set of byte =
[VK_Up,
VK_Down,
VK_Left,
VK_Right,
VK_Home,
VK_End,
VK_Prior, {PgUp}
VK_Next, {PgDn}
VK_Insert,
VK_Delete];
const
INVALIDKEY = $FFFF {Unsigned -1};
VKKEYSCANSHIFTON = $01;
VKKEYSCANCTRLON = $02;
VKKEYSCANALTON = $04;
UNITNAME = 'SendKeys';
var
UsingParens, ShiftDown, ControlDown, AltDown, FoundClose : Boolean;
PosSpace : Byte;
I, L : Integer;
NumTimes, MKey : Word;
KeyString : String[20];
procedure DisplayMessage(Msg: PChar);
begin
MessageBox(0, Msg, UNITNAME, 0);
end;
function BitSet(BitTable, BitMask: Byte): Boolean;
begin
Result := ByteBool(BitTable and BitMask);
end;
procedure SetBit(var BitTable : Byte; BitMask : Byte);
begin
BitTable:=BitTable or Bitmask;
end;
procedure KeyboardEvent(VKey, ScanCode: Byte; Flags: DWORD);
var
KeyboardMsg : TMsg;
begin
keybd_event(VKey, ScanCode, Flags, 0);
if Wait then
while PeekMessage(KeyboardMsg, 0, WM_KEYFIRST, WM_KEYLAST, PM_REMOVE) do begin
TranslateMessage(KeyboardMsg);
DispatchMessage(KeyboardMsg);
end;
end;
procedure SendKeyDown(VKey: Byte; NumTimes: Word; GenUpMsg: Boolean);
var
Cnt: Word;
ScanCode: Byte;
NumState: Boolean;
KeyBoardState: TKeyboardState;
begin
if (VKey = VK_NUMLOCK) then begin
NumState := ByteBool(GetKeyState(VK_NUMLOCK) and 1);
GetKeyBoardState(KeyBoardState);
if NumState then
KeyBoardState[VK_NUMLOCK] := (KeyBoardState[VK_NUMLOCK] and not 1)
else
KeyBoardState[VK_NUMLOCK] := (KeyBoardState[VK_NUMLOCK] or 1);
SetKeyBoardState(KeyBoardState);
Exit;
end;
ScanCode := Lo(MapVirtualKey(VKey, 0));
for Cnt := 1 to NumTimes do
if (VKey in ExtendedVKeys) then begin
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY);
if GenUpMsg then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP)
end
else begin
KeyboardEvent(VKey, ScanCode, 0);
if GenUpMsg then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_KEYUP);
end;
end;
procedure SendKeyUp(VKey: Byte);
var
ScanCode : Byte;
begin
ScanCode := Lo(MapVirtualKey(VKey, 0));
if (VKey in ExtendedVKeys)then
KeyboardEvent(VKey, ScanCode, KEYEVENTF_EXTENDEDKEY and KEYEVENTF_KEYUP)
else
KeyboardEvent(VKey, ScanCode, KEYEVENTF_KEYUP);
end;
procedure SendKey(MKey: Word; NumTimes: Word; GenDownMsg: Boolean);
begin
if BitSet(Hi(MKey), VKKEYSCANSHIFTON) then SendKeyDown(VK_SHIFT, 1, False);
if BitSet(Hi(MKey), VKKEYSCANCTRLON) then SendKeyDown(VK_CONTROL, 1, False);
if BitSet(Hi(MKey), VKKEYSCANALTON) then SendKeyDown(VK_MENU, 1, False);
SendKeyDown(Lo(MKey), NumTimes, GenDownMsg);
if BitSet(Hi(MKey), VKKEYSCANSHIFTON) then SendKeyUp(VK_SHIFT);
if BitSet(Hi(MKey), VKKEYSCANCTRLON) then SendKeyUp(VK_CONTROL);
if BitSet(Hi(MKey), VKKEYSCANALTON) then SendKeyUp(VK_MENU);
end;
// Implements a simple binary search to locate special key name strings
function StringToVKey(KeyString: ShortString): Word;
var
Found, Collided : Boolean;
Bottom, Top, Middle : Byte;
begin
Result := INVALIDKEY;
Bottom := 1;
Top := MaxSendKeyRecs;
Found := False;
Middle := (Bottom + Top) div 2;
repeat
Collided:=((Bottom=Middle) or (Top=Middle));
if (KeyString=SendKeyRecs[Middle].Name) then begin
Found:=True;
Result:=SendKeyRecs[Middle].VKey;
end
else begin
if (KeyString>SendKeyRecs[Middle].Name) then
Bottom:=Middle
else
Top:=Middle;
Middle:=(Succ(Bottom+Top)) div 2;
end;
until (Found or Collided);
if (Result = INVALIDKEY) then
DisplayMessage('Invalid Key Name');
end;
procedure PopUpShiftKeys;
begin
if (not UsingParens) then begin
if ShiftDown then SendKeyUp(VK_SHIFT);
if ControlDown then SendKeyUp(VK_CONTROL);
if AltDown then SendKeyUp(VK_MENU);
ShiftDown := False;
ControlDown := False;
AltDown := False;
end;
end;
var
AllocationSize : integer;
begin
AllocationSize := MaxInt;
Result := False;
UsingParens := False;
ShiftDown := False;
ControlDown := False;
AltDown := False;
I := 0;
L := StrLen(SendStr);
if (L > AllocationSize) then
L := AllocationSize;
if (L = 0) then
Exit;
while (I < L) do begin
case SendStr[I] of
'(': begin
UsingParens := True;
Inc(I);
end;
')': begin
UsingParens := False;
PopUpShiftKeys;
Inc(I);
end;
'%': begin
AltDown := True;
SendKeyDown(VK_MENU, 1, False);
Inc(I);
end;
'+': begin
ShiftDown := True;
SendKeyDown(VK_SHIFT, 1, False);
Inc(I);
end;
'^': begin
ControlDown := True;
SendKeyDown(VK_CONTROL, 1, False);
Inc(I);
end;
'{': begin
NumTimes := 1;
if (SendStr[Succ(I)] = '{') then begin
MKey := VK_LEFTBRACKET;
SetBit(WBytes(MKey)[1], VKKEYSCANSHIFTON);
SendKey(MKey, 1, True);
PopUpShiftKeys;
Inc(I, 3);
Continue;
end;
KeyString := '';
FoundClose := False;
while (I <= L) do begin
Inc(I);
if (SendStr[I] = '}') then begin
FoundClose := True;
Inc(I);
Break;
end;
KeyString := KeyString + Upcase(SendStr[I]);
end;
if Not FoundClose then begin
DisplayMessage('No Close');
Exit;
end;
if (SendStr[I] = '}') then begin
MKey := VK_RIGHTBRACKET;
SetBit(Wbytes(MKey)[1], VKKEYSCANSHIFTON);
SendKey(MKey, 1, True);
PopUpShiftKeys;
Inc(I);
Continue;
end;
PosSpace:=Pos(' ', KeyString);
if (PosSpace <> 0) then begin
NumTimes := StrToInt(Copy(KeyString, Succ(PosSpace), Length(KeyString) - PosSpace));
KeyString := Copy(KeyString, 1, Pred(PosSpace));
end;
If (Length(KeyString)=1) then
MKey := vkKeyScan(KeyString[1])
else
MKey := StringToVKey(KeyString);
If (MKey <> INVALIDKEY) then begin
SendKey(MKey, NumTimes, True);
PopUpShiftKeys;
Continue;
end;
end;
'~': begin
SendKeyDown(VK_RETURN, 1, True);
PopUpShiftKeys;
Inc(I);
end;
else
MKey := vkKeyScan(SendStr[I]);
if (MKey <> INVALIDKEY) then begin
SendKey(MKey, 1, True);
PopUpShiftKeys;
end
else
DisplayMessage('Invalid KeyName');
Inc(I);
end;
end;
Result := True;
PopUpShiftKeys;
end;
procedure TForm2.btnActivateClick(Sender: TObject);
var
sTitle, sKeys: string;
begin
sTitle := '*WordPad';
sKeys := 'Hello{ENTER}World!';
AppActivate(sTitle);
SendKeys(PChar(sKeys), False);
end;
procedure TForm2.Paste1Click(Sender: TObject);
begin
SendKeys('Hello{ENTER}World!', False);
end;
procedure TForm2.FormCreate(Sender: TObject);
begin
HotKeyId_L := GlobalAddAtom('HotKeyP');
RegisterHotKey(Handle, HotKeyId_L, MOD_CONTROL or MOD_ALT, Byte('L'));
HotKeyId_M := GlobalAddAtom('HotKeyM');
RegisterHotKey(Handle, HotKeyId_M, MOD_CONTROL or MOD_ALT, Byte('M'));
end;
procedure TForm2.FormDestroy(Sender: TObject);
begin
UnregisterHotKey(Handle, HotKeyId_L);
GlobalDeleteAtom(HotKeyId_L);
end;
procedure TForm2.wm_hotkeyhandler(var Msg: TWMHotkey);
var
Pt: TPoint;
begin
inherited;
if (Msg.HotKey = HotKeyId_L) then SendKeys('Hello{ENTER}World!', False);
if (Msg.HotKey = HotKeyId_M) then begin
GetCursorPos(Pt);
popPopup.Popup(Pt.x, Pt.y);
end;
end;
end.

Component to display log info in Delphi

I have a number of complex processing tasks that will produce messages, warnings, and fatal errors. I want to be able to display these messages in a task-independent component. My requirements are:
Different kinds of messages are displayed in different font and/or background colors.
The display can be filtered to include or exclude each kind of message.
The display will properly handle long messages by wrapping them and displaying the entire message.
Each message can have a data reference of some kind attached, and the message can be selected as an entity (eg, writing into an RTF memo won't work).
In essence, I'm looking for some kind of listbox like component that supports colors, filtering, and line wrapping. Can anyone suggest such a component (or another one) to use as the basis for my log display?
Failing that, I'll write my own. My initial thought is that I should base the component on a TDBGrid with a built-in TClientDataset. I would add messages to the client dataset (with a column for message type) and handle filtering through data set methods and coloring through the grid's draw methods.
Your thoughts on this design are welcome.
[Note: At this time I'm not particularly interested in writing the log to a file or integrating with Windows logging (unless doing so solves my display problem)]
I've written a log component that does most of what you need and it is based on VitrualTreeView. I've had to alter the code a bit to remove some dependencies, but it compiles fine (although it hasn't been tested after the alterations). Even if it's not exactly what you need, it might give you a good base to get started.
Here's the code
unit UserInterface.VirtualTrees.LogTree;
// Copyright (c) Paul Thornton
interface
uses
Classes, SysUtils, Graphics, Types, Windows, ImgList,
Menus,
VirtualTrees;
type
TLogLevel = (llNone,llError,llInfo,llWarning,llDebug);
TLogLevels = set of TLogLevel;
TLogNodeData = record
LogLevel: TLogLevel;
Timestamp: TDateTime;
LogText: String;
end;
PLogNodeData = ^TLogNodeData;
TOnLog = procedure(Sender: TObject; var LogText: String; var
CancelEntry: Boolean; LogLevel: TLogLevel) of object;
TOnPopupMenuItemClick = procedure(Sender: TObject; MenuItem:
TMenuItem) of object;
TVirtualLogPopupmenu = class(TPopupMenu)
private
FOwner: TComponent;
FOnPopupMenuItemClick: TOnPopupMenuItemClick;
procedure OnMenuItemClick(Sender: TObject);
public
constructor Create(AOwner: TComponent); override;
property OnPopupMenuItemClick: TOnPopupMenuItemClick read
FOnPopupMenuItemClick write FOnPopupMenuItemClick;
end;
TVirtualLogTree = class(TVirtualStringTree)
private
FOnLog: TOnLog;
FOnAfterLog: TNotifyEvent;
FHTMLSupport: Boolean;
FAutoScroll: Boolean;
FRemoveControlCharacters: Boolean;
FLogLevels: TLogLevels;
FAutoLogLevelColours: Boolean;
FShowDateColumn: Boolean;
FShowImages: Boolean;
FMaximumLines: Integer;
function DrawHTML(const ARect: TRect; const ACanvas: TCanvas;
const Text: String; Selected: Boolean): Integer;
function GetCellText(const Node: PVirtualNode; const Column:
TColumnIndex): String;
procedure SetLogLevels(const Value: TLogLevels);
procedure UpdateVisibleItems;
procedure OnPopupMenuItemClick(Sender: TObject; MenuItem: TMenuItem);
procedure SetShowDateColumn(const Value: Boolean);
procedure SetShowImages(const Value: Boolean);
procedure AddDefaultColumns(const ColumnNames: array of String;
const ColumnWidths: array of Integer);
function IfThen(Condition: Boolean; TrueResult,
FalseResult: Variant): Variant;
function StripHTMLTags(const Value: string): string;
function RemoveCtrlChars(const Value: String): String;
protected
procedure DoOnLog(var LogText: String; var CancelEntry: Boolean;
LogLevel: TLogLevel); virtual;
procedure DoOnAfterLog; virtual;
procedure DoAfterCellPaint(Canvas: TCanvas; Node: PVirtualNode;
Column: TColumnIndex; CellRect: TRect); override;
procedure DoGetText(Node: PVirtualNode; Column: TColumnIndex;
TextType: TVSTTextType; var Text: String); override;
procedure DoFreeNode(Node: PVirtualNode); override;
function DoGetImageIndex(Node: PVirtualNode; Kind: TVTImageKind;
Column: TColumnIndex; var Ghosted: Boolean; var Index: Integer):
TCustomImageList; override;
procedure DoPaintText(Node: PVirtualNode; const Canvas: TCanvas;
Column: TColumnIndex; TextType: TVSTTextType); override;
procedure Loaded; override;
public
constructor Create(AOwner: TComponent); override;
procedure Log(Value: String; LogLevel: TLogLevel = llInfo;
TimeStamp: TDateTime = 0);
procedure LogFmt(Value: String; const Args: array of Const;
LogLevel: TLogLevel = llInfo; TimeStamp: TDateTime = 0);
procedure SaveToFileWithDialog;
procedure SaveToFile(const Filename: String);
procedure SaveToStrings(const Strings: TStrings);
procedure CopyToClipboard; reintroduce;
published
property OnLog: TOnLog read FOnLog write FOnLog;
property OnAfterLog: TNotifyEvent read FOnAfterLog write FOnAfterLog;
property HTMLSupport: Boolean read FHTMLSupport write FHTMLSupport;
property AutoScroll: Boolean read FAutoScroll write FAutoScroll;
property RemoveControlCharacters: Boolean read
FRemoveControlCharacters write FRemoveControlCharacters;
property LogLevels: TLogLevels read FLogLevels write SetLogLevels;
property AutoLogLevelColours: Boolean read FAutoLogLevelColours
write FAutoLogLevelColours;
property ShowDateColumn: Boolean read FShowDateColumn write
SetShowDateColumn;
property ShowImages: Boolean read FShowImages write SetShowImages;
property MaximumLines: Integer read FMaximumLines write FMaximumLines;
end;
implementation
uses
Dialogs,
Clipbrd;
resourcestring
StrSaveLog = '&Save';
StrCopyToClipboard = '&Copy';
StrTextFilesTxt = 'Text files (*.txt)|*.txt|All files (*.*)|*.*';
StrSave = 'Save';
StrDate = 'Date';
StrLog = 'Log';
constructor TVirtualLogTree.Create(AOwner: TComponent);
begin
inherited;
FAutoScroll := TRUE;
FHTMLSupport := TRUE;
FRemoveControlCharacters := TRUE;
FShowDateColumn := TRUE;
FShowImages := TRUE;
FLogLevels := [llError, llInfo, llWarning, llDebug];
NodeDataSize := SizeOf(TLogNodeData);
end;
procedure TVirtualLogTree.DoAfterCellPaint(Canvas: TCanvas; Node: PVirtualNode;
Column: TColumnIndex; CellRect: TRect);
var
ColWidth: Integer;
begin
inherited;
if Column = 1 then
begin
if FHTMLSupport then
ColWidth := DrawHTML(CellRect, Canvas, GetCellText(Node,
Column), Selected[Node])
else
ColWidth := Canvas.TextWidth(GetCellText(Node, Column));
if not FShowDateColumn then
ColWidth := ColWidth + 32; // Width of image
if ColWidth > Header.Columns[1].MinWidth then
Header.Columns[1].MinWidth := ColWidth;
end;
end;
procedure TVirtualLogTree.DoFreeNode(Node: PVirtualNode);
var
NodeData: PLogNodeData;
begin
inherited;
NodeData := GetNodeData(Node);
if Assigned(NodeData) then
NodeData.LogText := '';
end;
function TVirtualLogTree.DoGetImageIndex(Node: PVirtualNode; Kind: TVTImageKind;
Column: TColumnIndex; var Ghosted: Boolean;
var Index: Integer): TCustomImageList;
var
NodeData: PLogNodeData;
begin
Images.Count;
if ((FShowImages) and (Kind in [ikNormal, ikSelected])) and
(((FShowDateColumn) and (Column <= 0)) or
((not FShowDateColumn) and (Column = 1))) then
begin
NodeData := GetNodeData(Node);
if Assigned(NodeData) then
case NodeData.LogLevel of
llError: Index := 3;
llInfo: Index := 2;
llWarning: Index := 1;
llDebug: Index := 0;
else
Index := 4;
end;
end;
Result := inherited DoGetImageIndex(Node, Kind, Column, Ghosted, Index);
end;
procedure TVirtualLogTree.DoGetText(Node: PVirtualNode; Column: TColumnIndex;
TextType: TVSTTextType; var Text: String);
begin
inherited;
if (TextType = ttNormal) and ((Column <= 0) or (not FHTMLSupport)) then
Text := GetCellText(Node, Column)
else
Text := '';
end;
procedure TVirtualLogTree.DoOnAfterLog;
begin
if Assigned(FOnAfterLog) then
FOnAfterLog(Self);
end;
procedure TVirtualLogTree.DoOnLog(var LogText: String; var
CancelEntry: Boolean; LogLevel: TLogLevel);
begin
if Assigned(FOnLog) then
FOnLog(Self, LogText, CancelEntry, LogLevel);
end;
procedure TVirtualLogTree.DoPaintText(Node: PVirtualNode; const Canvas: TCanvas;
Column: TColumnIndex; TextType: TVSTTextType);
begin
inherited;
Canvas.Font.Color := clBlack;
end;
function TVirtualLogTree.GetCellText(const Node: PVirtualNode; const
Column: TColumnIndex): String;
var
NodeData: PLogNodeData;
begin
NodeData := GetNodeData(Node);
if Assigned(NodeData) then
case Column of
-1, 0: Result := concat(DateTimeToStr(NodeData.Timestamp), '.',
FormatDateTime('zzz', NodeData.Timestamp));
1: Result := NodeData.LogText;
end;
end;
procedure TVirtualLogTree.AddDefaultColumns(
const ColumnNames: array of String; const ColumnWidths: array of Integer);
var
i: Integer;
Column: TVirtualTreeColumn;
begin
Header.Columns.Clear;
if High(ColumnNames) <> high(ColumnWidths) then
raise Exception.Create('Number of column names must match the
number of column widths.') // Do not localise
else
begin
for i := low(ColumnNames) to high(ColumnNames) do
begin
Column := Header.Columns.Add;
Column.Text := ColumnNames[i];
if ColumnWidths[i] > 0 then
Column.Width := ColumnWidths[i]
else
begin
Header.AutoSizeIndex := Column.Index;
Header.Options := Header.Options + [hoAutoResize];
end;
end;
end;
end;
procedure TVirtualLogTree.Loaded;
begin
inherited;
TreeOptions.PaintOptions := TreeOptions.PaintOptions - [toShowRoot,
toShowTreeLines, toShowButtons] + [toUseBlendedSelection,
toShowHorzGridLines, toHideFocusRect];
TreeOptions.SelectionOptions := TreeOptions.SelectionOptions +
[toFullRowSelect, toRightClickSelect];
AddDefaultColumns([StrDate,
StrLog],
[170,
120]);
Header.AutoSizeIndex := 1;
Header.Columns[1].MinWidth := 300;
Header.Options := Header.Options + [hoAutoResize];
if (PopupMenu = nil) and (not (csDesigning in ComponentState)) then
begin
PopupMenu := TVirtualLogPopupmenu.Create(Self);
TVirtualLogPopupmenu(PopupMenu).OnPopupMenuItemClick :=
OnPopupMenuItemClick;
end;
SetShowDateColumn(FShowDateColumn);
end;
procedure TVirtualLogTree.OnPopupMenuItemClick(Sender: TObject;
MenuItem: TMenuItem);
begin
if MenuItem.Tag = 1 then
SaveToFileWithDialog
else
if MenuItem.Tag = 2 then
CopyToClipboard;
end;
procedure TVirtualLogTree.SaveToFileWithDialog;
var
SaveDialog: TSaveDialog;
begin
SaveDialog := TSaveDialog.Create(Self);
try
SaveDialog.DefaultExt := '.txt';
SaveDialog.Title := StrSave;
SaveDialog.Options := SaveDialog.Options + [ofOverwritePrompt];
SaveDialog.Filter := StrTextFilesTxt;
if SaveDialog.Execute then
SaveToFile(SaveDialog.Filename);
finally
FreeAndNil(SaveDialog);
end;
end;
procedure TVirtualLogTree.SaveToFile(const Filename: String);
var
SaveStrings: TStringList;
begin
SaveStrings := TStringList.Create;
try
SaveToStrings(SaveStrings);
SaveStrings.SaveToFile(Filename);
finally
FreeAndNil(SaveStrings);
end;
end;
procedure TVirtualLogTree.CopyToClipboard;
var
CopyStrings: TStringList;
begin
CopyStrings := TStringList.Create;
try
SaveToStrings(CopyStrings);
Clipboard.AsText := CopyStrings.Text;
finally
FreeAndNil(CopyStrings);
end;
end;
function TVirtualLogTree.IfThen(Condition: Boolean; TrueResult,
FalseResult: Variant): Variant;
begin
if Condition then
Result := TrueResult
else
Result := FalseResult;
end;
function TVirtualLogTree.StripHTMLTags(const Value: string): string;
var
TagBegin, TagEnd, TagLength: integer;
begin
Result := Value;
TagBegin := Pos( '<', Result); // search position of first <
while (TagBegin > 0) do
begin
TagEnd := Pos('>', Result);
TagLength := TagEnd - TagBegin + 1;
Delete(Result, TagBegin, TagLength);
TagBegin:= Pos( '<', Result);
end;
end;
procedure TVirtualLogTree.SaveToStrings(const Strings: TStrings);
var
Node: PVirtualNode;
begin
Node := GetFirst;
while Assigned(Node) do
begin
Strings.Add(concat(IfThen(FShowDateColumn,
concat(GetCellText(Node, 0), #09), ''), IfThen(FHTMLSupport,
StripHTMLTags(GetCellText(Node, 1)), GetCellText(Node, 1))));
Node := Node.NextSibling;
end;
end;
function TVirtualLogTree.RemoveCtrlChars(const Value: String): String;
var
i: Integer;
begin
// Replace CTRL characters with <whitespace>
Result := '';
for i := 1 to length(Value) do
if (AnsiChar(Value[i]) in [#0..#31, #127]) then
Result := Result + ' '
else
Result := Result + Value[i];
end;
procedure TVirtualLogTree.Log(Value: String; LogLevel: TLogLevel;
TimeStamp: TDateTime);
var
CancelEntry: Boolean;
Node: PVirtualNode;
NodeData: PLogNodeData;
DoScroll: Boolean;
begin
CancelEntry := FALSE;
DoOnLog(Value, CancelEntry, LogLevel);
if not CancelEntry then
begin
DoScroll := ((not Focused) or (GetLast = FocusedNode)) and (FAutoScroll);
Node := AddChild(nil);
NodeData := GetNodeData(Node);
if Assigned(NodeData) then
begin
NodeData.LogLevel := LogLevel;
if TimeStamp = 0 then
NodeData.Timestamp := now
else
NodeData.Timestamp := TimeStamp;
if FRemoveControlCharacters then
Value := RemoveCtrlChars(Value);
if FAutoLogLevelColours then
case LogLevel of
llError: Value := concat('<font-color=clRed>', Value,
'</font-color>');
llInfo: Value := concat('<font-color=clBlack>', Value,
'</font-color>');
llWarning: Value := concat('<font-color=clBlue>', Value,
'</font-color>');
llDebug: Value := concat('<font-color=clGreen>', Value,
'</font-color>')
end;
NodeData.LogText := Value;
IsVisible[Node] := NodeData.LogLevel in FLogLevels;
DoOnAfterLog;
end;
if FMaximumLines <> 0 then
while RootNodeCount > FMaximumLines do
DeleteNode(GetFirst);
if DoScroll then
begin
//SelectNodeEx(GetLast);
ScrollIntoView(GetLast, FALSE);
end;
end;
end;
procedure TVirtualLogTree.LogFmt(Value: String; const Args: Array of
Const; LogLevel: TLogLevel; TimeStamp: TDateTime);
begin
Log(format(Value, Args), LogLevel, TimeStamp);
end;
procedure TVirtualLogTree.SetLogLevels(const Value: TLogLevels);
begin
FLogLevels := Value;
UpdateVisibleItems;
end;
procedure TVirtualLogTree.SetShowDateColumn(const Value: Boolean);
begin
FShowDateColumn := Value;
if Header.Columns.Count > 0 then
begin
if FShowDateColumn then
Header.Columns[0].Options := Header.Columns[0].Options + [coVisible]
else
Header.Columns[0].Options := Header.Columns[0].Options - [coVisible]
end;
end;
procedure TVirtualLogTree.SetShowImages(const Value: Boolean);
begin
FShowImages := Value;
Invalidate;
end;
procedure TVirtualLogTree.UpdateVisibleItems;
var
Node: PVirtualNode;
NodeData: PLogNodeData;
begin
BeginUpdate;
try
Node := GetFirst;
while Assigned(Node) do
begin
NodeData := GetNodeData(Node);
if Assigned(NodeData) then
IsVisible[Node] := NodeData.LogLevel in FLogLevels;
Node := Node.NextSibling;
end;
Invalidate;
finally
EndUpdate;
end;
end;
function TVirtualLogTree.DrawHTML(const ARect: TRect; const ACanvas:
TCanvas; const Text: String; Selected: Boolean): Integer;
(*DrawHTML - Draws text on a canvas using tags based on a simple
subset of HTML/CSS
<B> - Bold e.g. <B>This is bold</B>
<I> - Italic e.g. <I>This is italic</I>
<U> - Underline e.g. <U>This is underlined</U>
<font-color=x> Font colour e.g.
<font-color=clRed>Delphi red</font-color>
<font-color=#FFFFFF>Web white</font-color>
<font-color=$000000>Hex black</font-color>
<font-size=x> Font size e.g. <font-size=30>This is some big text</font-size>
<font-family> Font family e.g. <font-family=Arial>This is
arial</font-family>*)
function CloseTag(const ATag: String): String;
begin
Result := concat('/', ATag);
end;
function GetTagValue(const ATag: String): String;
var
p: Integer;
begin
p := pos('=', ATag);
if p = 0 then
Result := ''
else
Result := copy(ATag, p + 1, MaxInt);
end;
function ColorCodeToColor(const Value: String): TColor;
var
HexValue: String;
begin
Result := 0;
if Value <> '' then
begin
if (length(Value) >= 2) and (copy(Uppercase(Value), 1, 2) = 'CL') then
begin
// Delphi colour
Result := StringToColor(Value);
end else
if Value[1] = '#' then
begin
// Web colour
HexValue := copy(Value, 2, 6);
Result := RGB(StrToInt('$'+Copy(HexValue, 1, 2)),
StrToInt('$'+Copy(HexValue, 3, 2)),
StrToInt('$'+Copy(HexValue, 5, 2)));
end
else
// Hex or decimal colour
Result := StrToIntDef(Value, 0);
end;
end;
const
TagBold = 'B';
TagItalic = 'I';
TagUnderline = 'U';
TagBreak = 'BR';
TagFontSize = 'FONT-SIZE';
TagFontFamily = 'FONT-FAMILY';
TagFontColour = 'FONT-COLOR';
TagColour = 'COLOUR';
var
x, y, idx, CharWidth, MaxCharHeight: Integer;
CurrChar: Char;
Tag, TagValue: String;
PreviousFontColour: TColor;
PreviousFontFamily: String;
PreviousFontSize: Integer;
PreviousColour: TColor;
begin
ACanvas.Font.Size := Canvas.Font.Size;
ACanvas.Font.Name := Canvas.Font.Name;
//if Selected and Focused then
// ACanvas.Font.Color := clWhite
//else
ACanvas.Font.Color := Canvas.Font.Color;
ACanvas.Font.Style := Canvas.Font.Style;
PreviousFontColour := ACanvas.Font.Color;
PreviousFontFamily := ACanvas.Font.Name;
PreviousFontSize := ACanvas.Font.Size;
PreviousColour := ACanvas.Brush.Color;
x := ARect.Left;
y := ARect.Top + 1;
idx := 1;
MaxCharHeight := ACanvas.TextHeight('Ag');
While idx <= length(Text) do
begin
CurrChar := Text[idx];
// Is this a tag?
if CurrChar = '<' then
begin
Tag := '';
inc(idx);
// Find the end of then tag
while (Text[idx] <> '>') and (idx <= length(Text)) do
begin
Tag := concat(Tag, UpperCase(Text[idx]));
inc(idx);
end;
///////////////////////////////////////////////////
// Simple tags
///////////////////////////////////////////////////
if Tag = TagBold then
ACanvas.Font.Style := ACanvas.Font.Style + [fsBold] else
if Tag = TagItalic then
ACanvas.Font.Style := ACanvas.Font.Style + [fsItalic] else
if Tag = TagUnderline then
ACanvas.Font.Style := ACanvas.Font.Style + [fsUnderline] else
if Tag = TagBreak then
begin
x := ARect.Left;
inc(y, MaxCharHeight);
end else
///////////////////////////////////////////////////
// Closing tags
///////////////////////////////////////////////////
if Tag = CloseTag(TagBold) then
ACanvas.Font.Style := ACanvas.Font.Style - [fsBold] else
if Tag = CloseTag(TagItalic) then
ACanvas.Font.Style := ACanvas.Font.Style - [fsItalic] else
if Tag = CloseTag(TagUnderline) then
ACanvas.Font.Style := ACanvas.Font.Style - [fsUnderline] else
if Tag = CloseTag(TagFontSize) then
ACanvas.Font.Size := PreviousFontSize else
if Tag = CloseTag(TagFontFamily) then
ACanvas.Font.Name := PreviousFontFamily else
if Tag = CloseTag(TagFontColour) then
ACanvas.Font.Color := PreviousFontColour else
if Tag = CloseTag(TagColour) then
ACanvas.Brush.Color := PreviousColour else
///////////////////////////////////////////////////
// Tags with values
///////////////////////////////////////////////////
begin
// Get the tag value (everything after '=')
TagValue := GetTagValue(Tag);
if TagValue <> '' then
begin
// Remove the value from the tag
Tag := copy(Tag, 1, pos('=', Tag) - 1);
if Tag = TagFontSize then
begin
PreviousFontSize := ACanvas.Font.Size;
ACanvas.Font.Size := StrToIntDef(TagValue, ACanvas.Font.Size);
end else
if Tag = TagFontFamily then
begin
PreviousFontFamily := ACanvas.Font.Name;
ACanvas.Font.Name := TagValue;
end;
if Tag = TagFontColour then
begin
PreviousFontColour := ACanvas.Font.Color;
try
ACanvas.Font.Color := ColorCodeToColor(TagValue);
except
//Just in case the canvas colour is invalid
end;
end else
if Tag = TagColour then
begin
PreviousColour := ACanvas.Brush.Color;
try
ACanvas.Brush.Color := ColorCodeToColor(TagValue);
except
//Just in case the canvas colour is invalid
end;
end;
end;
end;
end
else
// Draw the character if it's not a ctrl char
if CurrChar >= #32 then
begin
CharWidth := ACanvas.TextWidth(CurrChar);
if y + MaxCharHeight < ARect.Bottom then
begin
ACanvas.Brush.Style := bsClear;
ACanvas.TextOut(x, y, CurrChar);
end;
x := x + CharWidth;
end;
inc(idx);
end;
Result := x - ARect.Left;
end;
{ TVirtualLogPopupmenu }
constructor TVirtualLogPopupmenu.Create(AOwner: TComponent);
function AddMenuItem(const ACaption: String; ATag: Integer): TMenuItem;
begin
Result := TMenuItem.Create(Self);
Result.Caption := ACaption;
Result.Tag := ATag;
Result.OnClick := OnMenuItemClick;
Items.Add(Result);
end;
begin
inherited Create(AOwner);
FOwner := AOwner;
AddMenuItem(StrSaveLog, 1);
AddMenuItem('-', -1);
AddMenuItem(StrCopyToClipboard, 2);
end;
procedure TVirtualLogPopupmenu.OnMenuItemClick(Sender: TObject);
begin
if Assigned(FOnPopupMenuItemClick) then
FOnPopupMenuItemClick(Self, TMenuItem(Sender));
end;
end.
If you add any additional features, maybe you could post them here.
I always like to use the VirtualTreeView by Mike Lischke for such a task. Its highly flexible and quite complex, but when you have understood how it works you can nearly acomplish any list or tree visualisation task with it.
I already did something similar with it, but did not encapsulate it in a component at that time.

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