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Date Posted: 07:19:00 08/22/00 Tue
Author: Michel
Subject: Re: Invalid class typecast?
In reply to: Robert 's message, "Re: Invalid class typecast?" on 10:43:20 08/21/00 Mon


Hi Robert,

Try using Image2.Picture.LoadFromFile instead. When you use the Bitmap property, your are forcing to load the file with the TBitmap class. When using Picture.LoadFromFile, the VCL will find the class that is registered to read the type specified by the extension. So if you include EnReg or EnBmpGr in a uses clause, your bmp file should be loaded with the TBitmapGraphic class, unless you have disabled the Envision bmp support in the Envision.Inc.

Best regards,

Michel

> Hi michel,
>
> The graphic is a Delphi Tbitmap class, this is how I
> load it:
> image2.picture.bitmap.loadfromfile('myfile.bmp');
>
> Do you know how I can convert the Tbitmap to a
> TDibGraphic?
> Or is there another way to do this, I don't want to
> use the imagescrollbox because I have implemented a
> resize method with different filters which can not
> load the image from the imagescrollbox component, due
> to the same problem I quess.
>
> Thanks
>
> Robert
>
> >
> > Hi Robert,
> >
> > This means that the type of graphic loaded in
> > Image2.Picture.Graphic is not a TDibGraphic derived
> > class. For example, it may be a Delphi TBitmap class.
> > To determine that, use
> > Image2.Picture.Graphic.ClassName and assign it to a
> > temporary variable and look at it in the debugger.
> How
> > is your image loaded on the TImage?
> >
> > Best regards,
> >
> > Michel
> >
> > > Hello
> > >
> > > When I try to run my app which has the following
> line
> > > graphic := image2.picture.graphic as TDibGraphic;
> > > Delphi genereates a 'invalid class typecast' error.
> > > I've read the previous post about this, but this
> > > didn't work for me (Am I doing something wrong
> here?)
> > >
> > > Please help me out on this one?
> > >
> > > Thanks
> > >
> > > Robert

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