Use ChangeDisplaySettings to change the Orientation

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Windows

Hi guys,
I am writing a program to change the orientation of the display, but it failed with the error code -2(DISP_CHANGE_BADMODE), then I use the EnumDisplaySettings to enum all the settings, and find that all the display settings' dmDisplayOrientation is just DMDO_DEFAULT, but I think the settings should contain the DMDO_90,180 and 270;

here are my codes
Scroll 15:33:42
  DISPLAY_DEVICE dspDev;
	
	vector<DISPLAY_DEVICE> vectorDSP;	
	vectorDSP.clear();
	
	for (int i = 0; i < 10; i++)
	{
		memset(&dspDev, 0 , sizeof(dspDev));
		dspDev.cb = sizeof(dspDev);
		if ( ::EnumDisplayDevices(NULL, i, &dspDev, 0) == FALSE)
		{
			break;
		}

		if ( wcscmp( (WCHAR*)dspDev.DeviceName, _T("\\\\.\\DISPLAYV1") ) != 0 &&
			wcscmp( (WCHAR*)dspDev.DeviceName, _T("\\\\.\\DISPLAYV2") ) != 0 &&
			wcscmp( (WCHAR*)dspDev.DeviceName, _T("\\\\.\\DISPLAYV3" )) != 0 )
		{
			vectorDSP.push_back(dspDev);

		}

	}
	
	
	vector<DEVMODE> VectorDevMode0;
	vector<DEVMODE> VectorDevMode90;
	vector<DEVMODE> VectorDevMode180;
	vector<DEVMODE> VectorDevMode270;

	vector<DISPLAY_DEVICE>::iterator iter = vectorDSP.begin();
	for (iter = vectorDSP.begin(); iter != vectorDSP.end(); ++iter)
	{
			
			//for (int i = 0; i < 10; i++)
			{
				DEVMODE devMod;
				devMod.dmSize = sizeof(devMod);
				int i = 0;
				while (EnumDisplaySettings(iter->DeviceName,i,&devMod) != FALSE)
				{
					//devMod = devMod;
					i++;
					if (devMod.dmDisplayOrientation == DMDO_DEFAULT)
					{
						VectorDevMode0.push_back(devMod);
					}
					else if (devMod.dmDisplayOrientation == DMDO_90)
					{
						VectorDevMode90.push_back(devMod);
					}
					else if (devMod.dmDisplayOrientation == DMDO_180)
					{
						VectorDevMode180.push_back(devMod);
					}
					else if (devMod.dmDisplayOrientation == DMDO_270)
					{
						VectorDevMode270.push_back(devMod);
					}
					memset(&devMod,0 ,sizeof(devMod));
					devMod.dmSize = sizeof(devMod);
				}
			}
			
	}