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Date Posted: 06:38:09 10/18/01 Thu
Author: Michel
Subject: Re: Invalid offset into the BLOB - AGAIN - Correction
In reply to: Petko Penev 's message, "Invalid offset into the BLOB - AGAIN - Correction" on 08:03:09 10/17/01 Wed


Dear Petko,

I would be very suprised it is the SaveToStream method that is problematic; I have used this method thousands of times for tiff files.

It must be some interaction with TBlobStream.

I would recommend using a TMemoryStream instead instead of a TBlobStream:

var
Stream : TMemoryStream;
Field : TBlobStream;

...

Stream := TMemoryStream.Create;
Graphic.SaveToStream(Stream);
Stream.Seek(0, soFromBeginning);

Field := FieldByName('Picture') as TBlobField;
Field.LoadFromStream(Stream);

Stream.Free;

Best regards,

Michel

>I have placed a wrong example - the first - in the
>previous posted letter. That is the correct variant of
>the procedure.
>
>procedure TMain.aLoadShemaExecute(Sender: TObject);
>var
> Stream: TBlobStream;
> Graphic: TTiffGraphic;
>begin
> with OpenPictureDialog1 do
> if Execute then
> begin
> ImageShema.Picture.LoadFromFile(FileName); // Only
>tiff files (ImageShema: TImage)
>
> with DataModule1.tblTree do
> begin
> Edit;
>
>Stream:=TBlobStream.Create(FieldByName('Picture') as
>TBlobField, bmWrite);
> Graphic:=TTiffGraphic.Create;
> Graphic:=ImageShema.Picture.Graphic as
>TTiffGraphic;
> Graphic.SaveToStream(Stream); // Here raise the
>error
> Post;
> Graphic.Free;
> Stream.Free;
> end;
> end;
>end;

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