Creating TQReport elements at run time.
Well, at least trying...
I don't know what headings or data shall appear on this report. I get a TList of TStrings representing the data rows and columns. I plant the 'Create' directives in the band print event for the group and the OnNeedData event for main data row bands.
But nothing appears. Must I make the labels at design time? Do not want.
To get you started, this works:
// uses QuickRpt, qrpBaseCtrls, QRCtrls, QRPrntr;
procedure TForm1.Button1Click(Sender: TObject);
var QR: TQuickRep;
QB: TQRBand;
QL: TQRLabel;
begin
QR := TQuickRep.Create(Self);
try
QR.PrintIfEmpty := True;
QB := TQRBand.Create(Self);
QB.Parent := QR;
QB.BandType := rbTitle;
QL := TQRLabel.Create(Self);
QL.Parent := QB;
QL.Left := 10;
QL.Top := 10;
QL.AutoSize := True;
QL.Caption := 'This works';
QR.Preview;
finally QR.Free;
end;
end;
Related
I need to extract a list of unique items from 12 years' worth of consistent computer-generated one-per day text files. The filenames vary only by the included date, so it is easy to generate the required name in code. They consist of a list of all the aircraft movements at my local airport during the given day, in time order. Naturally, the same aircraft come and go many times, and the objective is to loop through the files, pick out the first instance of when each individual aircraft appears (the first visit or FV) copy it to a list and then ignore it from then on. The result should be a list of all the first visits in date order. Should be simple, but... My program is small so I am including the entire implementation code.
procedure TForm1.FormCreate(Sender: TObject);
begin
FileDate := StrToDate('01/01/2007');
FName := 'E:LGW Reports/SBSLGW2007-01-01.txt'; //1st file to be read
FDStr := copy(FName, 21, 10);
TempList := TStringList.Create; //temp holder for file contents
FVCheckList := TStringList.Create; //holds unique identifier (UID)
FVCheckList.Sorted := TRUE;
FVCheckList.Duplicates := dupIgnore;
FVList:= TStringList.Create; //the main output
end;
procedure TForm1.Button1Click(Sender: TObject);
var
i: integer;
begin
Memo1.Lines.Append('Started');
Repeat
TempList.Clear;
TempList.LoadFromFile(FName);
for i := 1 to TempList.Count-1 do
begin
Line := TempList.Strings[i];
//create a //create a Unique identifier (UID) from elements in Line
Serial := Trim(Copy(Line, 22, 9));
MsnPos1 := Pos('[', Line) + 1;
MsnPos2 := Pos(']', Line);
Msn := copy(Line, MsnPos1, (MsnPos2 - MsnPos1));
UID := Serial + '/' + Msn;
//
if (FVCheckList.IndexOf(UID) < 0) then
begin
FVCheckList.Append(UID);
//Add date of file to Line, otherwise it gives no clue when FV was
FVList.Append(FormatDateTime('YYYY-MM-DD', FileDate) + ' ' + Line);
FileDate := IncDay(FileDate, 1);
FName := 'E:LGW Reports/SBSLGW' + FormatDateTime('YYYY-MM-DD', FileDate) + '.txt';
end;
end;
Until FileExists(FName) = FALSE;
FVCheckList.SaveToFile('E:LGW Reports/First Visit Checklist.txt');
FVList.SaveToFile('E:LGW Reports/First Visits.txt');
Memo1.Lines.Append('Finished');
Memo1.Lines.SaveToFile('E:LGW Reports/Files parsed.txt');
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
TempList.Free;
FVCheckList.Free;
FVList.Free;
end;
There are no compiler errors, it runs to completion in seconds and produces the two text files specified, correctly formatted. The big problem is that the lines actually listed in FVList are not always the very first visit of the aircraft, they can be the first, the most recent or somewhere in between. I cannot see any obvious clue as to why the wrong instance is appearing: if my code is right, then something is wrong with the functioning of TStringList FVCheckList. The fault is far more likely to be something I have overlooked, or my understanding of how .dupIgnore works, or maybe my looping isn't working as it should.
I should be very grateful for any practical help. Many thanks in advance.
Repeat
...
Until FileExists(FName) = FALSE;
Should be
While FileExists(FName) = TRUE do
Begin
End;
If the first 2007-01-01 file does not exist, your code will crash on the first LoadFromFile() since you don't check for the file's existence before loading it, unlike with the subsequent files.
Otherwise, I would suggest sticking with repeat but assign FName at the top of each loop iteration instead of initializing it outside the loop and then reassigning at the bottom of each iteration. No need to duplicate efforts.
If you check IndexOf() manually, you don't need to use Sorted or dupIgnore at all. This is what you should be doing in this situation. When dupIgnore ignores a new string, Append() doesn't tell you that the string was ignored. To do that, you would have to check whether the Count was actually increased or not.
Inside the outer loop, the reassignment of FileDate and FName should be outside of the inner for loop,not inside the for loop at all.
Try this instead:
procedure TForm1.FormCreate(Sender: TObject);
begin
FileDate := EncodeDate(2007,1,1);
FDStr := FormatDateTime('YYYY-MM-DD', FileDate);
TempList := TStringList.Create; //temp holder for file contents
FVCheckList := TStringList.Create; //holds unique identifier (UID)
FVList := TStringList.Create; //the main output
end;
procedure TForm1.Button1Click(Sender: TObject);
var
i: integer;
begin
Memo1.Lines.Append('Started');
Repeat
FName := 'E:LGW Reports/SBSLGW' + FormatDateTime('YYYY-MM-DD', FileDate) + '.txt';
if not FileExists(FName) then Break;
Memo1.Lines.Append(FName)
TempList.LoadFromFile(FName);
for i := 1 to TempList.Count-1 do
begin
Line := TempList.Strings[i];
//create a Unique identifier (UID) from elements in Line
Serial := Trim(Copy(Line, 22, 9));
MsnPos1 := Pos('[', Line) + 1;
MsnPos2 := PosEx(']', Line, MsnPos1);
Msn := copy(Line, MsnPos1, (MsnPos2 - MsnPos1));
UID := Serial + '/' + Msn;
if FVCheckList.IndexOf(UID) = -1 then
begin
FVCheckList.Append(UID);
//Add date of file to Line, otherwise it gives no clue when FV was
FVList.Append(FormatDateTime('YYYY-MM-DD', FileDate) + ' ' + Line);
end;
end;
FileDate := IncDay(FileDate, 1);
end;
FVCheckList.SaveToFile('E:LGW Reports/First Visit Checklist.txt');
FVList.SaveToFile('E:LGW Reports/First Visits.txt');
Memo1.Lines.Append('Finished');
Memo1.Lines.SaveToFile('E:LGW Reports/Files parsed.txt');
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
TempList.Free;
FVCheckList.Free;
FVList.Free;
end;
Using Delphi XE8 I'm currently testing functionality with Firemonkey TListViews.
One thing I'm trying to do is to load a field of all records from a TFDMemtable component into a Listview Item, specifically into the DetailObject of the ListView Item.
For example, I have 3 records in a table (db field is called 'Name'):
Record 1 = Name 1
Record 2 = Name 2
Record 3 = Name 3
There is only 1 DetailObject property per ListView Item so my question is, would I be able to add all of the fields (Name 1, Name 2, Name 3) into that one DetailObject?
Below is what I've attempted so far but no luck. Not 100% sure what I need to do.
procedure MainForm.BuildList;
var LItem : TListViewItem;
begin
ListView1.BeginUpdate;
try
ListView1.CLearItems;
LItem := ListView1.Items.Add;
LItem.Objects.DetailObject.Visible := True;
with memtable do
begin
while not eof do
begin
LItem.Detail := FieldByName('Name').AsString;
end;
end;
finally
ListView1.EndUpdate;
end;
end;
I'm sorry if this isn't clear enough, please let me know.
Any help would be great.
I think I should warn you that before seeing your q, I'd never done anything with FMX ListViews and Master/Detail datasets. The Following is a little rough around the edges, and the layout isn't ideal, but it shows one way to populate a ListView from Master + Detail datasets. I have no idea whether there are better ways. Personally, I would see if I could use Live Bindings to do the job.
procedure TMasterDetailForm.BuildList;
var
LItem : TListViewItem;
DetailItem : TListViewItem;
ListItemText : TListItemText;
DetailIndex : Integer;
begin
ListView1.BeginUpdate;
ListView1.ItemAppearanceObjects.ItemEditObjects.Text.TextVertAlign := TTextAlign.Leading; // The default
// seems to be `Center`, whereas we want the Master field name to be at the top of the item
try
ListView1.Items.Clear; //Items;
Master.First;
while not Master.eof do begin
LItem := ListView1.Items.Add;
LItem.Text := Master.FieldByName('Name').AsString;
LItem.Height := 25;
Detail.First;
DetailIndex := 0;
while not Detail.Eof do begin
Inc(DetailIndex);
ListItemText := TListItemText.Create(LItem);
ListItemText.PlaceOffset.X := 100;
ListItemText.PlaceOffset.Y := 25 * (DetailIndex - 1);
ListItemText.TextAlign := TTextAlign.Leading;
ListItemText.Name := 'Name' + IntToStr(DetailIndex); //Detail.FieldByName('Name').AsString;
LItem.Data['Name' + IntToStr(DetailIndex)] := Detail.FieldByName('Name').AsString;
Detail.Next;
end;
LItem.Height := LItem.Height * (1 + DetailIndex);
Master.Next;
end;
finally
ListView1.EndUpdate;
end;
end;
TListItemText is one of a number of "drawable" FMX objects that can be added to do the TListViewItem. They seem to need unique names so that they can be accessed via the Names property.
FWIW, I used 2 TClientDataSets as the Master and Detail in my code.
Also FWIW, for FMX newbies like me, populating an FMX TreeView is a lot more like what you'd do in a VCL project:
procedure TMasterDetailForm.BuildTree;
var
PNode,
ChildNode : TTreeViewItem;
begin
TreeView1.BeginUpdate;
try
TreeView1.Clear;
Master.First;
while not Master.eof do begin
PNode := TTreeViewItem.Create(TreeView1);
TreeView1.AddObject(PNode);
PNode.Text := Master.FieldByName('Name').AsString;
Detail.First;
while not Detail.Eof do begin
ChildNode := TTreeViewItem.Create(TreeView1);
ChildNode.Text := Detail.FieldByName('Name').AsString;
PNode.AddObject(ChildNode);
Detail.Next;
end;
Master.Next;
end;
finally
TreeView1.EndUpdate;
end;
end;
Btw, in your code you should have been calling
memtable.Next;
in your while not eof loop, and memtable.First immediately before the loop.
i have a DBGrid and it is linked to client dataset when i assign a SQLQuery at run time
the DBGrid automatically assigns no of column. What i need is when DBGrid automatically assign columns i need to set one of those columns to assign a picklist.
can anyone help me?
the following procedure calls in the forms on show event. the form contains DataSource, ClientDataSet, SQLViewQuery (TSQLQuery), DatasetProvider and DBGridDetails (TDBGrid).
procedure TViewDetailsForm.ViewPendingAndReturnCheques;
var I : Integer;
slPickList:TStringList;
begin
slPickList := TStringList.Create;
slPickList.Add('Pending');
slPickList.Add('Returned');
slPickList.Add('Passed');
SQL := 'SELECT a.CHEQUE_NO, a.BANK, a.CHEQUE_DATE, a.AMOUNT,a.STATUS FROM CHEQUES a';
//refreshisng the DBGrid
SQLViewQuery.SQL.Clear;
SQLViewQuery.SQL.Add(SQL);
ClientDataSet.Active := false;
ClientDataSet.Active := true;
DBGridDetails.Columns[0].Width := _Block;
DBGridDetails.Columns[1].Width := _Block;
DBGridDetails.Columns[2].Width := _Block;
DBGridDetails.Columns[3].Width := _Block;
DBGridDetails.Columns[4].Width := _Block;
for I := 0 to DBGridDetails.Columns.Count - 1 do
begin
if DBGridDetails.Columns[I].FieldName = 'STATUS' then
begin
DBGridDetails.Columns[i].ButtonStyle := cbsAuto;
DBGridDetails.Columns[I].PickList := slPickList;
end;
end;
Show;
end;
Here's a sample app I just created in Delphi 2007 that demonstrates how to accomplish this. Here's all I did to set it up:
Click File->New-VCL Forms Application from the IDE's main menu.
Drop a TClientDataSet, a TDataSource, and a TDBGrid on the form.
Click on the form, and then use the Object Inspector to create a new OnCreate event handler. Add the following code:
procedure TForm1.FormCreate(Sender: TObject);
var
SL: TStringList;
begin
with ClientDataSet1 do
begin
FieldDefs.Clear;
FieldDefs.Add('OrderNo', ftInteger);
FieldDefs.Add('Status', ftString, 10);
CreateDataSet;
end;
ClientDataSet1.Active := True;
// Connect a datasource to the CDS
DataSource1.DataSet := ClientDataSet1;
// Connect the grid to that datasource to create the columns.
DBGrid1.DataSource := DataSource1;
// Create the picklist for the second column (Status)
SL := TStringList.Create;
try
SL.Add('Pending');
SL.Add('Returned');
SL.Add('Passed');
DBGrid1.Columns[1].ButtonStyle := cbsAuto;
DBGrid1.Columns[1].PickList := SL;
finally
SL.Free;
end;
end;
Run the application, click in the Status column in the grid, and you'll see the three choices added to the PickList above.
You can assign values to the dbgrid column picklist during the run time.
Below is the code:
procedure Tfrm1.FormShow(Sender: TObject);
var
slPickList:TStringList;
I: Integer;
begin
slPickList := TStringList.Create;
slPickList.Add('Pending');
slPickList.Add('Returned');
slPickList.Add('Passed');
for I := 0 to 2 do
begin
dbgViewAxiomClaims.Columns1.PickList.add(slPickList[i]);//assigning
end;
end;
Below is the result:
I have a listbox and add items to it, items are address of files, items are added after some processes and they are inserted like this:
Listbox_Browser.Items := myItems;
so as im not adding them one by one i cant check them during inserting ti listbox, i tried to check them in OnDraw and used a code like this:
Try
FileOpenandP(Listbox_Browser.Items[Index]);
Except
ListBox_Browser.Items.Delete(Index);
End;
but i got the error "List index out of bounds", what is the solution?
The OnDrawItem event is for drawing only. You are not supposed to be managing your list inside that event, only drawing its current items as needed.
Instead of assiging the whole list at one time, you should be checking the files first, then assign the remaining list to the ListBox, eg:
I := 0;
while I < myItems.Count do
begin
try
FileOpenandP(myItems[I]);
Inc(I);
except
myItems.Delete(I);
end;
end;
ListBox_Browser.Items := myItems;
If you don't want myItems altered, use a separate list instead:
tmpItems := TStringList.Create;
try
tmpItems.Assign(myItems);
I := 0;
while I < tmpItems.Count do
begin
try
FileOpenandP(tmpItems[I]);
Inc(I);
except
tmpItems.Delete(I);
end;
end;
ListBox_Browser.Items := tmpItems;
finally
tmpItems.Free;
end;
Or:
ListBox_Browser.Items := myItems;
I := 0;
while I < ListBox_Browser.Items.Count do
begin
try
FileOpenandP(ListBox_Browser.Items[I]);
Inc(I);
except
ListBox_Browser.Items.Delete(I);
end;
end;
Or:
ListBox_Browser.Items.BeginUpdate;
try
ListBox_Browser.Items.Clear;
I := 0;
for I := 0 to myItems.Count-1 do
begin
try
FileOpenandP(myItems[I]);
except
Continue;
end;
ListBox_Browser.Items.Add(myItems[I]);
end;
finally
ListBox_Browser.Items.EndUpdate;
end;
I'm a newbie into Delphi and i need an advice.
I'm using a TMS TDBAdvGrid and i need to sort the data when the user is clicking the header of a column. I setup the sort settings of the grid and i write code for the onclicksort event, but it is not working.
The sort settings of the grid:
SortSettings.Show = True;
SortSettings.IgnoreBlanks = True;
SortSettings.BlankPos = blLast;
the onclicksort event:
try
try
if FSortISWorking then
Exit;
FSortISWorking := true;
if ACol < 0 then
begin
grid.BeginUpdate;
grid.SortSettings.Column := ACol;
Application.ProcessMessages;
grid.QSort;
grid.EndUpdate;
end;
except on e: Exception do
begin
// log the error
end;
end;
finally
FSortISWorking := false;
end;
The grid is not linked directly to the database. The data is loaded into memory (TClientDataSet) and i need to sort the data only in memory, without another query to the database.
Thank you
I tried your example and this solved the issue for me:
Grid.PageMode := False;
In order to resolve this problem you must order the dataset behind your grid. here you have how to do this in general:http://delphi.about.com/od/usedbvcl/l/aa042203a.htm.
bellow you have an example:
procedure TForm1.DBAdvGrid1CanSort(Sender:TObject; ACol: Integer; var DoSort: Boolean);
var fldname:string;
begin
DoSort := False; // disable internal sort
// toggle sort order if
dbadvgrid1.SortSettings.Direction = sdAscending then
dbadvgrid1.SortSettings.Direction := sdDescending else
dbadvgrid1.SortSettings.Direction := sdAscending;
// get field name of the column
clicked fldname :=query1.FieldList.Fields[ACol -1].FieldName;
if pos(' ',fldname) 0 then fldname:= 'biolife.db."'+fldname+'"';
// add ORDER BY clause to the query
query1.SQL.Text := 'select * from
biolife.db ORDER BY '+fldname;
if dbadvgrid1.SortSettings.Direction =
sdDescending then query1.SQL.Text :=
query1.SQL.Text + ' DESC';
query1.Active := true;
DBAdvGrid1.SortSettings.Column := ACol;
end;
if you want to order your clientdataset here you have how to do it:
http://edn.embarcadero.com/article/29056
best regards,
Radu