Managed C++/CLI

// Create a normal DC and a memory DC for the entire screen. The 
// normal DC provides a "snapshot" of the screen contents. The 
// memory DC keeps a copy of this "snapshot" in the associated 
// bitmap. 
 
hdcScreen = CreateDC("DISPLAY", NULL, NULL, NULL); 
hdcCompatible = CreateCompatibleDC(hdcScreen); 
 
// Create a compatible bitmap for hdcScreen. 
 
hbmScreen = CreateCompatibleBitmap(hdcScreen, 
                     GetDeviceCaps(hdcScreen, HORZRES), 
                     GetDeviceCaps(hdcScreen, VERTRES)); 
 
if (hbmScreen == 0) 
    errhandler("hbmScreen", hwnd); 
 
// Select the bitmaps into the compatible DC. 
 
if (!SelectObject(hdcCompatible, hbmScreen)) 
    errhandler("Compatible Bitmap Selection", hwnd); 
 
// Hide the application window. 
 
ShowWindow(hwnd, SW_HIDE); 
 
//Copy color data for the entire display into a 
//bitmap that is selected into a compatible DC. 
 
if (!BitBlt(hdcCompatible, 
        0,0, 
        bmp.bmWidth, bmp.bmHeight, 
        hdcScreen, 
        0,0, 
        SRCCOPY)) 
  
        errhandler("Screen to Compat Blt Failed", hwnd); 
 
// Redraw the application window. 
 
ShowWindow(hwnd, SW_SHOW);