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null_ptr0 · Feb 22nd, 2008, 6:13 PM

I've tried to do CreateCompatibleDC(source_device) but it contains a result the same height and size as source_device but every pixel as black. Any help?

(Toggle Plain Text)

const int SCREEN_WIDTH = GetSystemMetrics(SM_CXSCREEN) - 1;
const int SCREEN_HEIGHT = GetSystemMetrics(SM_CXSCREEN) - 1;
...
    int x;
    HDC screen_device = GetDC(NULL);
    HDC copy = CreateCompatibleDC(screen_device);
    for (x = 0; x <= SCREEN_WIDTH; ++x) {
        for (int y = 0; y <= SCREEN_HEIGHT; ++y) {
            SetPixel(screen_device, x, y,  GetPixel(copy, SCREEN_WIDTH - x, y));
        }
    }
...

EDIT:
I see I have to use BitBlt? If so, may I have an example? I have an inefficiency in understanding win32 argument names.

Feb 22nd, 2008, 6:13 PM	#1
null_ptr0 12 years old Join Date: Nov 2007 Posts: 94 Rep Power: 1	[win32][gdi32] Copying HDC to another? I've tried to do CreateCompatibleDC(source_device) but it contains a result the same height and size as source_device but every pixel as black. Any help? (Toggle Plain Text) const int SCREEN_WIDTH = GetSystemMetrics(SM_CXSCREEN) - 1; const int SCREEN_HEIGHT = GetSystemMetrics(SM_CXSCREEN) - 1; ... int x; HDC screen_device = GetDC(NULL); HDC copy = CreateCompatibleDC(screen_device); for (x = 0; x <= SCREEN_WIDTH; ++x) { for (int y = 0; y <= SCREEN_HEIGHT; ++y) { SetPixel(screen_device, x, y, GetPixel(copy, SCREEN_WIDTH - x, y)); } } ... const int SCREEN_WIDTH = GetSystemMetrics(SM_CXSCREEN) - 1; const int SCREEN_HEIGHT = GetSystemMetrics(SM_CXSCREEN) - 1; ... int x; HDC screen_device = GetDC(NULL); HDC copy = CreateCompatibleDC(screen_device); for (x = 0; x <= SCREEN_WIDTH; ++x) { for (int y = 0; y <= SCREEN_HEIGHT; ++y) { SetPixel(screen_device, x, y, GetPixel(copy, SCREEN_WIDTH - x, y)); } } ... EDIT: I see I have to use BitBlt? If so, may I have an example? I have an inefficiency in understanding win32 argument names.