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Date Posted: 20:05:57 05/03/01 Thu
Author: Michel
Subject: Re: Problem in using TGraphicClass
In reply to: wen 's message, "Problem in using TGraphicClass" on 13:08:33 05/03/01 Thu

Hi Wen,

The structure of the code looks fine. The first thing I would try is replacing the types TGraphicClass and TGraphic with TDibGraphicClass and TDibGraphic respectively.

I wonder if Delphi is not confused with the run-time type information when handling class variables. If you trace into GraphicClass.Create, does the debugger bring you to an Envision unit?

Best regards,


>I use TJpegGraphic as following:
> GraphicClass: TGraphicClass;
> Graphic: TGraphic:
> GraphicClass := TJpegGraphic;
> Graphic := GraphicClass.Create;
> Graphic.LoadFromFile('mypicture.jpg');
>//Access Violation every time I execute here
>In addition, I found in the second statement
>GraphicClass.Create does not call the
>TJpegGraphic.Create method.
>However, if modified the above code to:
> Graphic := TJpegGraphic.Create;
> Graphic.LoadFromFile('mypicture.abc');
>all work correctly, Can anyone tell me what wrong with
>the first code sippet.

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