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Date Posted: 17:31:20 11/13/01 Tue
Author: Michel
Subject: Re: Invalid offset into the BLOB - AGAIN - Correction
In reply to: Ruy 's message, "Re: Invalid offset into the BLOB - AGAIN - Correction" on 06:44:13 11/13/01 Tue

Hi Ruy,

The first thing I would check is the type of your field.

Look at FieldByName('Picture').ClassName in a variable with the debugger. Is it really a TBlobField?

Best regards,


>Hi Michel,
>When i use this method i get the error "incompatible
>type TBlobStream and TBlobField" in
>Field := FieldByName('Picture') as TBlobField;
>>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:
>>Stream : TMemoryStream;
>>Field : TBlobStream;
>>Stream := TMemoryStream.Create;
>>Stream.Seek(0, soFromBeginning);
>>Field := FieldByName('Picture') as TBlobField;
>>Best regards,
>>>I have placed a wrong example - the first - in the
>>>previous posted letter. That is the correct variant
>>>the procedure.
>>>procedure TMain.aLoadShemaExecute(Sender: TObject);
>>> Stream: TBlobStream;
>>> Graphic: TTiffGraphic;
>>> with OpenPictureDialog1 do
>>> if Execute then
>>> begin
>>> ImageShema.Picture.LoadFromFile(FileName); //
>>>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
>>> Graphic.SaveToStream(Stream); // Here raise the
>>> Post;
>>> Graphic.Free;
>>> Stream.Free;
>>> end;
>>> end;

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