File Masking in delphi - delphi

Question

I am trying to find all files that have the extenstion .cbr or .cbz
If i set my mask to *.cb?
it finds *.cbproj files. How can i set the mask to only find .cbr and .cbz files?
here is code i am using.
I have two edit boxes EDIT1 is the location to search, EDIT2 is where i put my mask. A listbox to show what it found and a Search button.
edit1 := c:\
edit2 := mask (*.cb?)
space
procedure TFAutoSearch.FileSearch(const PathName, FileName : string; const InDir : boolean);
var Rec : TSearchRec;
Path : string;
begin
Path := IncludeTrailingBackslash(PathName);
if FindFirst(Path + FileName, faAnyFile - faDirectory, Rec) = 0 then
try
repeat
ListBox1.Items.Add(Path + Rec.Name);
until FindNext(Rec) <> 0;
finally
FindClose(Rec);
end;
If not InDir then Exit;
if FindFirst(Path + '*.*', faDirectory, Rec) = 0 then
try
repeat
if ((Rec.Attr and faDirectory) <> 0) and (Rec.Name<>'.') and (Rec.Name<>'..') then
FileSearch(Path + Rec.Name, FileName, True);
until FindNext(Rec) <> 0;
finally
FindClose(Rec);
end;
end; //procedure FileSearch
procedure TFAutoSearch.Button1Click(Sender: TObject);
begin
FileSearch(Edit1.Text, Edit2.Text, CheckBox1.State in [cbChecked]);
end;
end.

Answer 1

The easiest way is to use ExtractFileExt against the current filename and check to see if it matches either of your desired extensions.
Here's a fully-rewritten version of your FileSearch routine which does exactly what you're trying to do (according to your question, anyway):
procedure TFAutoSearch.FileSearch(const ARoot: String);
var
LExt, LRoot: String;
LRec: TSearchRec;
begin
LRoot := IncludeTrailingPathDelimiter(ARoot);
if FindFirst(LRoot + '*.*', faAnyFile, LRec) = 0 then
begin
try
repeat
if (LRec.Attr and faDirectory <> 0) and (LRec.Name <> '.') and (LRec.Name <> '..') then
FileSearch(LRoot + LRec.Name)
else
begin
LExt := UpperCase(ExtractFileExt(LRoot + LRec.Name));
if (LExt = '.CBR') or (LExt = '.CBZ') then
ListBox1.Items.Add(LRoot + LRec.Name);
end;
until (FindNext(LRec) <> 0);
finally
FindClose(LRec);
end;
end;
end;
While the other answer suggesting the use of multiple extensions as a mask *.cbr;*.cbz should (in principal anyway) work, I've noted through bitter experience that the FindFirst and FindNext methods in Delphi tend not to accept multiple extensions in a mask!
The code I've provided should work just fine for your needs, so enjoy!
UPDATED: To allow the use of multiple extensions in a Mask dynamically at runtime (as indicated by the OP's first comment to this answer).
What we're going to do is take a String from your TEdit control (this String is one or more File Extensions as you would expect), "Explode" the String into an Array, and match each file against each Extension in the Array.
Sounds more complicated than it is:
type
TStringArray = Array of String; // String Dynamic Array type...
// Now let's provide a "Mask Container" inside the containing class...
TFAutoSearch = class(TForm)
// Normal stuff in here
private
FMask: TStringArray; // Our "Mask Container"
end;
This code will populate FMask with each individual mask extension separated by a ; such as .CBR;.CBZ.
Note this method will not accept Wildcard characters or any other Regex magic, but you can modify it as you require!
procedure TFAutoSearch.ExplodeMask(const AValue: String);
var
LTempVal: String;
I, LPos: Integer;
begin
LTempVal := AValue;
I := 0;
while Length(LTempVal) > 0 do
begin
Inc(I);
SetLength(FMask, I);
LPos := Pos(';', LTempVal);
if (LPos > 0) then
begin
FMask[I - 1] := UpperCase(Copy(LTempVal, 0, LPos - 1));
LTempVal := Copy(LTempVal, LPos + 1, Length(LTempVal));
end
else
begin
FMask[I - 1] := UpperCase(LTempVal);
LTempVal := EmptyStr;
end;
end;
end;
We now need a function to determine if the nominated file matches any of the defined Extensions:
function TFAutoSearch.MatchMask(const AFileName: String): Boolean;
var
I: Integer;
LExt: String;
begin
Result := False;
LExt := UpperCase(ExtractFileExt(LExt));
for I := Low(FMask) to High(FMask) do
if (LExt = FMask[I]) then
begin
Result := True;
Break;
end;
end;
Now here's the modified FileSearch procedure:
procedure TFAutoSearch.FileSearch(const ARoot: String);
var
LRoot: String;
LRec: TSearchRec;
begin
LRoot := IncludeTrailingPathDelimiter(ARoot);
if FindFirst(LRoot + '*.*', faAnyFile, LRec) = 0 then
begin
try
repeat
if (LRec.Attr and faDirectory <> 0) and (LRec.Name <> '.') and (LRec.Name <> '..') then
FileSearch(LRoot + LRec.Name)
else
begin
if (MatchMask(LRoot + LRec.Name)) then
ListBox1.Items.Add(LRoot + LRec.Name);
end;
until (FindNext(LRec) <> 0);
finally
FindClose(LRec);
end;
end;
end;
Finally, here's how you initiate your search:
procedure TFAutoSearch.btnSearchClick(Sender: TObject);
begin
ExplodeMask(edMask.Text);
FileSearch(edPath.Text);
end;
Where edMask is defined in your question as Edit2 and edPath is defined in your question as Edit1. Just remember that this method doesn't support the use of Wildcard or other Special Chars, so edMask.Text should be something like .CBR;.CBZ
If you use the Regex library for Delphi, you could easily modify this method to support all of the Expression Cases you could ever imagine!

Answer 2

Dorin's suggestion to replace your mask with *.cbr;*.cbz should work. That is, it won't match cbproj anymore. It would, however, still match cbzy or any other extension that starts with cbr or cbz. The reason for this is that FindFirst/FindNext match both the long form and the legacy short forms (8.3) of file names. So the short forms will always have truncated extensions where cbproj is shortened to cbp, and therefore matches cb?.
This is supposed to be avoidable by using FindFirstEx instead, but this requires a small rewrite of your search function and actually didn't work for me. So instead I just double checked all matches with the MatchesMask function.