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Date Posted: 14:00:51 11/14/01 Wed
Author: Ruy
Subject: Re: Invalid offset into the BLOB - AGAIN - Correction
In reply to: Michel 's message, "Re: Invalid offset into the BLOB - AGAIN - Correction" on 17:31:20 11/13/01 Tue

Hi Michel,

Yes, it is a TBlobField type in Delphi. But in the SQLServer it is a image type.

var Field : TBlobStream ;
Graphic: TTiffGraphic;
begin
qryQuery.Edit;
Stream := TMemoryStream.Create;
Graphic:=TTiffGraphic.Create;
Graphic:=ImageScrollBox.Graphic as TTiffGraphic;
Graphic.SaveToStream(Stream);
Stream.Seek(0, soFromBeginning);
Field := qryQuery.FieldByName('Image') as TBlobField;
Field.LoadFromStream(Stream);
qryQuery.Post;
Graphic.Free;
Stream.Free;
end;
When i try to run the example i get the COMPILATION error "Incompatible types TBloabStream and TBloabField" in the line Field := qryQuery.FieldByName('Image') as TBlobField;

>
>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,
>
>Michel
>
>>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:
>>>
>>>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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