How do I set the monitor orientation in Windows 7?
I want to write some fun code to flip the orientation upside down on Windows 7. See screen shot of the option I want to control.
Here is the code I have:
class Program
{
public const long WM_PAINT=0x0F;
public const long WM_DISPLAYCHANGE=0x7E;
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
public struct DEVMODE // taken from Win API
{
...
public System.Windows.Forms.ScreenOrientation dmDisplayOrientation;
}
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);
[DllImport("user32.dll", CharSet=CharSet.Ansi)]
public static extern int ChangeDisplaySettings(ref DEVMODE lpDevMode, int dwFlags);
[DllImport("User32.Dll")]
public static extern long PostMessage(IntPtr hWnd, long wMsg, long wParam, long lParam);
static void Main(string[] args)
{
ScreenOrientation ori=ScreenOrientation.Angle0;
DEVMODE mode=new DEVMODE()
{
dmSize=(short)Marshal.SizeOf(typeof(DEVMODE)),
dmDriverExtra=0,
dmDeviceName=new string(new char[32]),
dmFormName=new string(new char[32]),
};
try
{
EnumDisplaySettings(null, -1, ref mode);
if((mode.dmFields&0x80)>0)
{
ori=mode.dmDisplayOrientation;
}
mode.dmDisplayOrientation=ScreenOrientation.Angle270;
int temp=mode.dmPelsWidth;
mode.dmPelsWidth=mode.dmPelsHeight;
mode.dmPelsHeight=temp;
int ret=ChangeDisplaySettings(ref mode, 0);
PostMessage(Process.GetCurrentProcess().Handle, WM_DISPLAYCHANGE, 0, 0);
...
}
catch
{
}
}
}
which runs, but does not produce any affects.
Reference code: http://justlikeamagic.com/2009/05/21/changing-display-settings-programmatically/ and http://msdn.microsoft.com/en-us/library/ms812499.aspx#tbconchgscrn_chngingdisplay
I have started something.
Please have a look: MultiMonitorHelper
It includes necessary structures for Win7, so that you could call SetDisplayConfig and other functions.
An actual example, how to rotate monitor 90 degrees:
int numPathArrayElements;
int numModeInfoArrayElements;
const QueryDisplayFlags pathType = QueryDisplayFlags.OnlyActivePaths;
// query active paths from the current computer.
// note that 0 is equal to SUCCESS!
// TODO; HARDCODE MAGIC VALUES AWAY.
if (CCDWrapper.GetDisplayConfigBufferSizes(pathType, out numPathArrayElements,
out numModeInfoArrayElements) == 0)
{
var pathInfoArray = new DisplayConfigPathInfo[numPathArrayElements];
var modeInfoArray = new DisplayConfigModeInfo[numModeInfoArrayElements];
// TODO; FALLBACK MECHANISM THAT HANDLES DIFFERENT VALUES FOR ZERO.
if (CCDWrapper.QueryDisplayConfig(
pathType,
ref numPathArrayElements, pathInfoArray,
ref numModeInfoArrayElements,
modeInfoArray, IntPtr.Zero) == 0)
{
pathInfoArray[0].targetInfo.rotation = DisplayConfigRotation.Rotate90;
CCDWrapper.SetDisplayConfig((uint) numPathArrayElements, pathInfoArray, (uint) numModeInfoArrayElements,
modeInfoArray, SdcFlags.Apply | SdcFlags.UseSuppliedDisplayConfig);
}
}
it's raw right now, meaning there is no "C# style" API right now, but none the less, you can use those structures.
On Windows 7, ChangeDisplaySetting has a known compatibility issue. The workaround is to call the WDK function: SetDisplayConfig .
http://social.msdn.microsoft.com/Forums/en/windowsuidevelopment/thread/5bc2396d-1e0e-44fb-b73b-95f8dfc45684
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