运用Windows Api来调整屏幕亮度

使用Windows Api来调整屏幕亮度
/*调整亮度 参数0-100设置成功返回0设置失败返回负数*/int SetGamma(int bright){void * lpGamma = NULL;int iArrayValue;WORD gMap[3][256] = {0};lpGamma = &gMap;HDC hdc = ::GetDC(NULL);if (NULL == hdc)return -1;for (int i = 0; i < 256; i++){iArrayValue = i * (bright + 128);if (iArrayValue > 65535)iArrayValue = 65535; gMap[0][i] =gMap[1][i] =gMap[2][i] = (WORD)iArrayValue;}if (FALSE == SetDeviceGammaRamp(hdc, lpGamma))return -2;return 0;}