Freeing GDI Resources

[awni]

Hi
I have global variables :
CDC g_dc;
CBitmap g_bmp;

both of these are deleted and recreated in OnSize

   
   ...
    
    g_bmp.DeleteObject();  
    g_dc.DeleteDC();

    g_dc.CreateCompatibleDC(&ScreenDC);
    g_bmp.CreateCompatibleDC(&g_dc, newWidth, newHeight); 
   
    ...

the resources don't seem to be freed correctly, because after
resizing the window a few times, the application cannot create a bitmap anymore using CreateCompatibleBitmap(..)

what can i do to fully free the resources?

thanks

awni

[bytz]

This would not be my prefered approach; I'd tend to put the bitmap creation in the paint handler and either create the global dc once, or as needed in the paint (The compatible DC does not need to be recreated on size or bitmap changes). Other than that, you need to ensure that the bitmap is not selected into the DC when you delete it.

[Mustafa]

Hi Awni,

Before you DeleteObject(), you need to select the old bitmap back into DC...maybe thats what eating up resources...

CBitmpap* pOldBitmap=g_dc.SelectObject(&g_bmp);

//use it then

g_dc.SelectObject(pOldBitmap);// selecting back the original bitmap

g_bmp.DeleteObject();

//etc

Hope that helps

Regards

Mustafa

[awni]

thanks everyone

resources are being freed as they should be
awni