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POUse Windows API from C# to set primary monitor
 

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    <p>I'm trying to use the Windows API to set the primary monitor. It doesn't seem to work - my screen just flicks and nothing happens.</p> <pre><code> public const int DM_ORIENTATION = 0x00000001; public const int DM_PAPERSIZE = 0x00000002; public const int DM_PAPERLENGTH = 0x00000004; public const int DM_PAPERWIDTH = 0x00000008; public const int DM_SCALE = 0x00000010; public const int DM_POSITION = 0x00000020; public const int DM_NUP = 0x00000040; public const int DM_DISPLAYORIENTATION = 0x00000080; public const int DM_COPIES = 0x00000100; public const int DM_DEFAULTSOURCE = 0x00000200; public const int DM_PRINTQUALITY = 0x00000400; public const int DM_COLOR = 0x00000800; public const int DM_DUPLEX = 0x00001000; public const int DM_YRESOLUTION = 0x00002000; public const int DM_TTOPTION = 0x00004000; public const int DM_COLLATE = 0x00008000; public const int DM_FORMNAME = 0x00010000; public const int DM_LOGPIXELS = 0x00020000; public const int DM_BITSPERPEL = 0x00040000; public const int DM_PELSWIDTH = 0x00080000; public const int DM_PELSHEIGHT = 0x00100000; public const int DM_DISPLAYFLAGS = 0x00200000; public const int DM_DISPLAYFREQUENCY = 0x00400000; public const int DM_ICMMETHOD = 0x00800000; public const int DM_ICMINTENT = 0x01000000; public const int DM_MEDIATYPE = 0x02000000; public const int DM_DITHERTYPE = 0x04000000; public const int DM_PANNINGWIDTH = 0x08000000; public const int DM_PANNINGHEIGHT = 0x10000000; public const int DM_DISPLAYFIXEDOUTPUT = 0x20000000; public const int ENUM_CURRENT_SETTINGS = -1; public const int CDS_UPDATEREGISTRY = 0x01; public const int CDS_TEST = 0x02; public const int CDS_SET_PRIMARY = 0x00000010; public const long DISP_CHANGE_SUCCESSFUL = 0; public const long DISP_CHANGE_RESTART = 1; public const long DISP_CHANGE_FAILED = -1; public const long DISP_CHANGE_BADMODE = -2; public const long DISP_CHANGE_NOTUPDATED = -3; public const long DISP_CHANGE_BADFLAGS = -4; public const long DISP_CHANGE_BADPARAM = -5; public const long DISP_CHANGE_BADDUALVIEW = -6; public static void SetPrimary(Screen screen) { DISPLAY_DEVICE d = new DISPLAY_DEVICE(); DEVMODE dm = new DEVMODE(); d.cb = Marshal.SizeOf(d); uint deviceID = 1; User_32.EnumDisplayDevices(null, deviceID, ref d, 0); // User_32.EnumDisplaySettings(d.DeviceName, 0, ref dm); dm.dmPelsWidth = 2560; dm.dmPelsHeight = 1600; dm.dmPositionX = screen.Bounds.Right; dm.dmFields = DM_POSITION | DM_PELSWIDTH | DM_PELSHEIGHT; User_32.ChangeDisplaySettingsEx(d.DeviceName, ref dm, IntPtr.Zero, CDS_SET_PRIMARY, IntPtr.Zero); } </code></pre> <p>I call the method like this:</p> <pre><code>SetPrimary(Screen.AllScreens[1]) </code></pre> <p>Any ideas?</p>
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