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Date Posted: 16:03:50 10/04/01 Thu
Author: Konstantin Rudenko
Subject: Tiff load from stream error

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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