my buffer won't copy
Author
I''m trying to recreate a simple double buffer for a small app and for some reason I can''t get the buffer DC to copy to the screen DC. Here''s the basic idea of the code.
CDC dcMem;
CDC dcBitmap;
CBitmap bmCurrent;
CBitmap* pbmOld;
bmCurrent.LoadBitmap(IDB_ENERGY);
dcMem.CreateCompatibleDC(pDC);
dcBitmap.CreateCompatibleDC(&dcMem);
pbmOld = dcBitmap.SelectObject(&bmCurrent);
dcMem.BitBlt(0,0,640,480,&dcBitmap,0,0,SRCCOPY);
dcBitmap.SelectObject(pbmOld);
then later
pDC->BitBlt(0,0,640,480,&dcMem,0,0,SRCCOPY);
Any help would be appreciated. Thanks
egwenejs - that one guy
you may call me lame, but I say skip the MFC shit and learn win32 API instead...
signed,
[edited by - Enselic on December 12, 2002 5:52:37 AM]
signed,
[edited by - Enselic on December 12, 2002 5:52:37 AM]
Author
True as that may be what happens if that IS NOT an option.
Thanks
egwenejs - that one guy
Thanks
egwenejs - that one guy
Author
Yes pDC is past to me from CView::OnDraw(CDC* pDC)
egwenejs - that one guy
[edited by - egwenejs on December 13, 2002 3:02:32 AM]
egwenejs - that one guy
[edited by - egwenejs on December 13, 2002 3:02:32 AM]
all GDI functions return values indicating whether the respective operation succeeded or failed. which, if any, function in your code fails?
once you get to a failing function, use GetLastError() to get extended error information. what does it return?
once you get to a failing function, use GetLastError() to get extended error information. what does it return?
Author
All functions return TRUE and GetLastError returns 0 at the end
egwenejs - that one guy
egwenejs - that one guy
Author
I fiddled around with creating a compatible bitmap to dcMem and selecting that, but it just fills the screen with blackness. How would I get this bitmap to represent what is in dcBitmap without loading the orginal bitmap (bmCurrent) directly into it??
Thanks
egwenejs - that one guy
[edited by - egwenejs on December 13, 2002 3:56:34 AM]
Thanks
egwenejs - that one guy
[edited by - egwenejs on December 13, 2002 3:56:34 AM]
try creating a bitmap compatible with your window dc with dimensions equal to client area of your window, and selecting that into dcMem.
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