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HDC hdc;
HWND hwnd;
BOOL bRet = FALSE;
hwnd = ::GetDesktopWindow();
hdc = ::GetWindowDC(hwnd);
WORD GammaRamp[3*256] = {0};
bRet = ::GetDeviceGammaRamp(hdc, GammaRamp);
if (bRet)
{
::MessageBox(0,0,0,0);
}
// Then output content in GammaRamp.