Intermittent GDI Crash

[Declan McMullen]

On Mon, Apr 7, 2008 at 2:45 PM, Stefan Csomor <csomor at advancedconcepts.ch>
wrote:

>  Hi
>
> I assume the problem lies at the place where the wxDC is set-up, is this
> an ordinary Paint handler ? how are you setting it up ?
>

Hi,

wxPaintDC pdc(this);
wxGCDC dc(pdc);

I also tried it without the graphics context and it still failed
intermittently.



>
> Best,
>
> Stefan
>
>
> On 07.04.08 14:53, "Declan McMullen" <declan.mcmullen at gmail.com> wrote:
>
> Hey guys,
>
> I'm getting an intermittent failure in my program and I cant seem to find
> out why
> heres the code
>
> if(oldImage.compare(image) !=3D 0 || refreshImage)
>     {
>         overlayImage.Destroy();
>         overlayImage =3D wxImage(image);
>         wxSize size =3D this->GetSize();
>         overlayImage.Rescale(size.GetWidth(), size.GetHeight());
>
>         bitmap =3D wxBitmap(overlayImage);
>         oldImage =3D image;
>         refreshImage =3D false;
>     }
>     dc.DrawBitmap(bitmap, 0, 0, false);
>
>
> If creates a wxImage, rescales it to match the width and height of the
> panel im placing it in, then converts it
> to a dc for drawing. If the image hasnt change since the last draw I
> redraw the old image.
>
> When it crashed it brings me to this method from gdiplusgraphics.h
> I've placed an arrow where the debug arrow is
>
> SmoothingMode GetSmoothingMode() const
>     {
>         SmoothingMode smoothingMode =3D SmoothingModeInvalid;
>
>         SetStatus(DllExports::GdipGetSmoothingMode(nativeGraphics,
> ->                                                   &smoothingMode));
>
>         return smoothingMode;
>     }
>
> I'm using visual c++ 2005
>
> Sometimes it works fine sometimes it crashes, I havent been able to find a
> pattern to the crashes.
>
> Its probably something small im doing wrong.
> Any information much appreciated
>
>
>
> --
>
> Advanced Concepts AG
> Software-Engineering
> Heldweg 10
> CH-8475 Ossingen
> Switzerland
>
> phone:+41 52 245 0 245
> fax:+41 52 245 0 246
> http://www.advanced.ch
> mailto:csomor at advanced.ch <csomor at advanced.ch>
>
>
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>


-- =

http://www.computing.dcu.ie/~dmcmullen
declan.mcmullen at computing.dcu.ie
School of Computing
Postgrad Bay A
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