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Date Posted: 17:45:33 10/04/01 Thu
Author: Michel
Subject: Re: Tiff load from stream error
In reply to: Konstantin Rudenko 's message, "Tiff load from stream error" on 16:03:50 10/04/01 Thu


Hi Konstantin,

Thank you for reported this problem. I will fix it immediately in my code base for the next release.

Here is the change I have done. Your solution would give problems went MutliLoad is False, and SavePos is not correct.

Replace:

if ImageCount = 1 then
MultiLoad := False;

with

if ImageCount = 1 then
begin
MultiLoad := False;
Stream.Seek(SavedPos, soFromBeginning);
end;

Best regards,

Michel




>this small procedure showing error, tiff - any single
>page tiff file.
>
>procedure TForm1.TBItem4Click(Sender: TObject);
>var
> DG : TDibGraphic;
> FS : TFileStream;
>begin
> DG:=TTiffGraphic.Create;
> FS:=TFileStream.Create('d:\alya.tif',fmOpenRead or
>fmShareDenyNone);
> DG.MultiLoad:=true;
> DG.LoadFromStream(FS);
> FS.Free;
> DG.Free;
>end;
>
>problem in module EnDiGrph:
>
>procedure TDibGraphic.LoadFromStream(Stream: TStream);
>...
> if MultiLoad then
> begin
> SavedPos := Stream.Position;
> ImageCount := GetImageCount(Stream);
> if ImageCount = 1 then MultiLoad := False;
> end
> else
> ImageCount := 1;
>...
> if MultiLoad then
> begin
>....
> Stream.Seek(SavedPos, soFromBeginning);
> DibGraphic.SingleLoadFromStream(Stream,
>ImageNo);
>....
> end
> else
> Self.SingleLoadFromStream(Stream,
>FImageToLoad);
>.....
>flag Multiload is false but stream position after
>reading page count not restored, raise error TIFFOpen
>
>My solution:
>...
> else
> begin
> Stream.Seek(SavedPos, soFromBeginning);
> {restore position if Multiload was false just reset
>to 0}
> Self.SingleLoadFromStream(Stream,
>FImageToLoad);
> end;
>...
>
>---
>Konstantin

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