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Date Posted: 09:22:12 08/26/02 Mon
Author: Brian Lowe
Subject: Re: GIF thumbnail
In reply to: Brian Lowe 's message, "GIF thumbnail" on 09:17:32 08/26/02 Mon

Hi Michel,

Here is the same source code with some HTML formatting to make it easier to read:

if (AnsiUppercase(ExtractFileExt(FileList.Items[Index].Caption)) = '.GIF') then
begin
try
FPicture.LoadFromFile(FileList.Items[Index].Caption);
ADibGraphic := TDibGraphic.Create;
AStream := TMemoryStream.Create;
try
FPicture.Graphic.SaveToStream(AStream);
ADibGraphic.LoadFromStream(AStream);
FPicture.Graphic := ADibGraphic;
finally
ADibGraphic.Free;
AStream.Free;
end;
ValidImage := True;
except
ValidImage := False;
end;
end else
begin
ADibGraphic := EnDiGrph.NewDibGraphic(FileList.Items[Index].Caption);
try
FPicture.Graphic := ADibGraphic;
if FPicture.Graphic <> nil then
begin
FPicture.Graphic.LoadFromFile(FileList.Items[Index].Caption);
ValidImage := True;
end else
ValidImage := False;
finally
ADibGraphic.Free;
end;
end;
end;

>
>I am using your version 2 thumbnail generator, which
>works great for TDibGraphics but has trouble in
>DrawGridDrawCell for TGraphics.
>
>To solve the problem of "Invalid type cast" at
>
>FResizeTransform.Apply(FPicture.Graphic as
>TDibGraphic);
>
>I read your posts about unregistering Delphi native
>types and modified the .INC file. Now I get an
>exception that GIF is not supported. (I have TGifImage
>installed.) I tried the following to load a GIF into a
>TDibGraphic but the graphic is empty. Can you see
>where my problem can be, or suggest a better solution?
>
>if
>(AnsiUppercase(ExtractFileExt(FileList.Items[Index].Cap
>tion)) = '.GIF') then
>begin
> try
>
>FPicture.LoadFromFile(FileList.Items[Index].Caption);
> ADibGraphic := TDibGraphic.Create;
> AStream := TMemoryStream.Create;
> try
> FPicture.Graphic.SaveToStream(AStream);
> ADibGraphic.LoadFromStream(AStream);
> FPicture.Graphic := ADibGraphic;
> finally
> ADibGraphic.Free;
> AStream.Free;
> end;
> ValidImage := True;
> except
> ValidImage := False;
> end;
> end else
> begin
> ADibGraphic :=
>EnDiGrph.NewDibGraphic(FileList.Items[Index].Caption);
> try
> FPicture.Graphic := ADibGraphic;
> if FPicture.Graphic <> nil then
> begin
>
>FPicture.Graphic.LoadFromFile(FileList.Items[Index].Cap
>tion);
> ValidImage := True;
> end else
> ValidImage := False;
> finally
> ADibGraphic.Free;
> end;
> end;
>end;
>
>Thanks!
>Brian Lowe

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