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Windows 7: Reduce “BACKLIGHT” brightness in windows Embedded standard 7 using vc+

04 Feb 2016   #1

Windows 7 Embedded Standard
Reduce “BACKLIGHT” brightness in windows Embedded standard 7 using vc+

Is it possible to reduce the "Backlight brightness" in Windows Embedded standard 7, Monitor:Samsung DE40A programmatically with vc++ ? It is possible to reduce monitor backlight brightness with the monitor's remote.
I have been able to reduce brightness,contrast,gamma, and RGB values with the respective APIs SetMonitorBrightness, SetMonitorContrast, etc. Tried to use DeviceIoControl function with IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS but the function call doesn't succeed, it gives a non-zero value and according to msdn the function has failed

//Get the handle HANDLE hLCD = CreateFile("\\\\.\\LCD",       // open LCD device                          GENERIC_READ,                  // access to the drive                          FILE_SHARE_READ|FILE_SHARE_WRITE,// share mode                          NULL,                          // default security attributes                          OPEN_EXISTING,                 // disposition                          0,                             // file attributes                          NULL);  if (hLCD == INVALID_HANDLE_VALUE) {     cout << "error: Invalid Handle, unable to get LCD handle" << GetLastError() << endl;     return 1; }  BYTE SupportedBrightness[256]; DWORD nBytesReturned;  int nRes = DeviceIoControl(                (HANDLE) hLCD,                           // handle to device                IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS,  // dwIoControlCode                NULL,                                    // lpInBuffer                0,                                       // nInBufferSize                (LPVOID) SupportedBrightness,            // output buffer                sizeof(SupportedBrightness),             // size of output buffer                (LPDWORD) &nBytesReturned,               // bytes returned                NULL                                     // OVERLAPPED            );  if (nRes == 0) {     cout << "error: Backlight Not Supported" << GetLastError() << endl;     return 2; }  cout << "Supported levels:: "; for (DWORD i=0; i<nBytesReturned; i++) {     cout << (DWORD)SupportedBrightness[i] << ", "; } cout << endl << endl
I end up getting "Backlight not supported", but I can change back light brightness from Samsung Monitor's remote.

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 Reduce “BACKLIGHT” brightness in windows Embedded standard 7 using vc+

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