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Date Posted: 07:05:45 11/15/01 Thu
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 17:46:50 11/14/01 Wed

Michel,
I've already done this change but i get the "invalid BLOB lenght" error in tquery.Post
Any idea?


>
>Hi Ruy,
>
>I missed that on my last post:
>
>var Field : TBlobStream ;
>
>Field is TBlobStream not a TBlobField in your code. I
>made the mistake in my original example. It should be,
>
>var Field : TBlobField;
>
>I'm sorry about that.
>
>Best regards,
>
>Michel
>
>>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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