blit and BufferedPaintDC

[Xavier Miller]

Hello,

What do you screenshot ? If it is a graphic-accelerated application (DVD 
player, game), it will not work because the drawing is managed by the 
graphical card and not the OS.

Xavier.

Declan McMullen a écrit :
> Ive tried turning off double buffering and I still get an entitrely 
> black bitmap.
> If i set the bitmap to match another bitmap its fine, so It seems the 
> blit definitely isnt
> copying the content of the dc to the memory dc
> 
> Any ideas ?
> 
> On Sun, Apr 20, 2008 at 4:42 PM, Declan McMullen 
> <declan.mcmullen at gmail.com <mailto:declan.mcmullen at gmail.com>> wrote:
> 
> 
>     Is it possible to use blit with a double buffered paint dc ?
>     I have the following function
> 
> 
>     wxBitmap WorkspaceView::getScreenShot(wxDC& dc)
> 
>     {
> 
>     wxSize screenSize = dc.GetSize();
> 
>     wxBitmap screenBitmap(screenSize.GetWidth(), screenSize.GetHeight());
> 
>     wxMemoryDC memDC;
> 
>     memDC.SelectObject(screenBitmap);
> 
>     memDC.Blit(0, 0, screenSize.GetWidth(), screenSize.GetHeight(), &dc,
>     0, 0);
> 
>     memDC.SelectObject(wxNullBitmap);
> 
>     return screenBitmap;
> 
>     }
> 
> 
> 
>     What I wanted to do with it was make a bitmap I could use for
>     printing, i.e just put everything
> 
>     thats on the screen into a bitmap, send that image to my printout
>     object and print it.
> 
>     All I'm getting though is a completely black image and I'm thinking
>     its due to my double buffering ?
> 
> 
>     Is it possible for me to get the contents of the buffer itself and
>     use that ?
> 
> 
> 
>     -- 
>     http://www.computing.dcu.ie/~dmcmullen
>     <http://www.computing.dcu.ie/%7Edmcmullen>
>     declan.mcmullen at computing.dcu.ie
>     <mailto:declan.mcmullen at computing.dcu.ie>
>     School of Computing
>     Postgrad Bay A
> 
> 
> 
> 
> -- 
> http://www.computing.dcu.ie/~dmcmullen
> declan.mcmullen at computing.dcu.ie <mailto:declan.mcmullen at computing.dcu.ie>
> School of Computing
> Postgrad Bay A
> 
> 
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