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Date Posted: 16:37:45 01/10/03 Fri
Author: Paul Mead
Subject: Re: GetDIB failed on XP
In reply to: Michel 's message, "Re: GetDIB failed on XP" on 06:44:09 09/30/02 Mon

Hi Micheal

I had this problem earlier and used your suggestions to fix. GlobalAlloc instaed of GetMem at the one location in EnDiGrph.pas. This appeared to fix the problem, but now it is surfacing again on one New XP machine. GetDIB error. Funny this time it appears almost as a memory leak. Restart our program and it is good for a while than boom, restart and we are good for a while again.


>
>Hi Ed,
>
>I will email you directly a revised EnDiGrph.Pas. It
>has been reported to me that memory obtained with the
>VCLs GetMem causes failure on some graphic windows API
>calls.
>
>Let me know if this solves the problem on XP. You will
>see new calls to AllocMem instead of GetMem.
>
>Best regards,
>
>Michel
>
>>I have a program that creates multiple bitmaps and
>>saves them as tif files. It works fine on my Windows
>>2000 box all the time, but when I tried it on XP, I
>>sometimes get an error "GetDIB failed" (Maybe 50% of
>>the time). It gets the error when it tries to read
>>the bitmap I just saved to a file. I have included
>>sample code for you below. Just drop a ImageScrollBox
>>on a form with a button. When the button is pressed,
>>it should create 6 tiff image files.
>>
>>
>>procedure TForm1.Button1Click(Sender: TObject);
>>Var
>> Index : Integer;
>> ImageBitmap : TBitmap;
>>begin
>> ImageScrollBox1.Clear;
>>
>> ImageBitmap := TBitmap.Create;
>> try
>> With ImageBitmap do
>> begin
>> Monochrome := True;
>> Width := Round(300 * 8.5);
>> Height := 300 * 11;
>> Canvas.Font.Size := 24;
>> end;
>>
>> For Index := 1 to 6 do
>> begin
>> With ImageBitmap do
>> begin
>> Canvas.FillRect(Rect(100, 100, 800, 150));
>> Canvas.TextOut(100, 100, 'Test Image #' +
>>IntToStr(Index));
>> SaveToFile('Temp.bmp');
>> Application.ProcessMessages;
>> end;
>>
>> ImageScrollBox1.LoadFromFile('Temp.bmp', 1);
>> ImageScrollBox1.SaveToFile('Image' +
>>IntToStr(Index) + '.tif');
>>
>> DeleteFile('Temp.bmp');
>> end;
>> finally
>> ImageBitmap.Free;
>> end;
>>end;

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