void ScreenShot() {

   HDC hdcScreen, hdcMemory;
   int cxScreen, cyScreen;
   HBITMAP hbmMemory, hbmOld;
   BITMAPINFO bi;
   void* data;

   // get the HDC of the screen
   hdcScreen = GetDC(NULL);

   // get the screen size
   cxScreen = GetSystemMetrics(SM_CXSCREEN) / 10;
   cyScreen = GetSystemMetrics(SM_CYSCREEN) / 10;

   // create a compatible memory dc/bitmap pair
   hdcMemory = CreateCompatibleDC(hdcScreen);
   hbmMemory = CreateCompatibleBitmap(hdcScreen, cxScreen, cyScreen);
   hbmOld = (HBITMAP)SelectObject(hdcMemory, hbmMemory);

   // "capture" the screen into this pair
   BitBlt(hdcMemory, 0, 0, cxScreen, cyScreen, hdcScreen, 0, 0, SRCCOPY);

   // now that we got the screen into the HBITMAP, get its bits

   // we want to get it as 24-bpp
   ZeroMemory(&bi, sizeof(BITMAPINFO));
   bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
   bi.bmiHeader.biWidth = cxScreen;
   bi.bmiHeader.biHeight = cyScreen;
   bi.bmiHeader.biBitCount = 24;
   bi.bmiHeader.biPlanes = 1;

   // first call with a NULL pointer to fill in rest of bi.bmiHeader
   GetDIBits(hdcMemory, hbmMemory, 0, cyScreen, NULL, &bi, DIB_RGB_COLORS);

   // allocate memory (size is in bi.bmiHeader.biSizeImage)
   data = malloc(bi.bmiHeader.biSizeImage);

   // now get the data
   GetDIBits(hdcMemory, hbmMemory, 0, cyScreen, data, &bi, DIB_RGB_COLORS);

   // clean-up
   SelectObject(hdcMemory, hbmOld);
   DeleteDC(hdcMemory);
   DeleteObject(hbmMemory);

   return;
}