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Date Posted: 18:00:48 02/20/03 Thu
Author: Michel
Subject: Re: RE-Reguarding speeding up my app - Help!
In reply to: Dave Bracken 's message, "RE-Reguarding speeding up my app - Help!" on 10:49:37 02/20/03 Thu

Hi Dave,

I inspected the code in TTiffGraphic.SingleLoadFromStream and there seems to be a special case to load tif graphics from DFM files which creates a temporary stream. You can get around it by calling,

FileStream.Seek(0, soFromBeginning)

before .LoadFromStream.

Let me know how that goes.

Best regards,


>Hello again.
>I tried your suggestion in the previous post, but now
>it runs super fast on small files, but even slower
>than before on the large images. My code is something
>along the lines of:
>for aa := 0 to filelistbox1.items.count - 1 do begin
> FileStream :=
>TFileStream.create(FileListBox1.filename, fmOpenRead);
> GraphicFile := TTiffGraphic.Create;
> PageCount := GraphicFile.GetImageCount(FileStream);
> for ii := 0 to PageCount - 1 do begin
> PageToLoad := ii + 1;
> GraphicFile.ImageToLoad := PageToload;
> GraphicFile.LoadFromStream(FileStream);
> GraphicFile.SaveToFile(MyNewTifFilename);
> end;
> if GraphicFile <> nil then begin //These must
>be destroyed to release the file for deletion upon
>completion of conversion
> GraphicFile.Destroy;
> end;
> if FileStream <> nil then Begin
> FileStream.Destroy;
> end;
> Deletefile(Filelistbox1.Filename); //Deletes
>The original file after converting it.
>Ok, so i step through the code to see why it is
>running slower on my large file, and the slow down
>seems to be in the "LoadFromStream" line of code. It
>takes a full 3 to 4 seconds per image in the file to
>load. It took my software almost 5 minutes to convert
>2 files. 1 was a 16 page file, and the other was a 267
>page file(9 mb). It did not take as long doing it the
>other way(looping through a scrollbox).
>What am i missing here?
>Any further help you can provide would be greatly
>Thanks again in advance,
>Dave Bracken

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