Voici le code complet basé sur la solution de ADBailey:
public class MonitorChanger
{
public static void SetAsPrimaryMonitor(uint id)
{
var device = new DISPLAY_DEVICE();
var deviceMode = new DEVMODE();
device.cb = Marshal.SizeOf(device);
NativeMethods.EnumDisplayDevices(null, id, ref device, 0);
NativeMethods.EnumDisplaySettings(device.DeviceName, -1, ref deviceMode);
var offsetx = deviceMode.dmPosition.x;
var offsety = deviceMode.dmPosition.y;
deviceMode.dmPosition.x = 0;
deviceMode.dmPosition.y = 0;
NativeMethods.ChangeDisplaySettingsEx(
device.DeviceName,
ref deviceMode,
(IntPtr)null,
(ChangeDisplaySettingsFlags.CDS_SET_PRIMARY | ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY | ChangeDisplaySettingsFlags.CDS_NORESET),
IntPtr.Zero);
device = new DISPLAY_DEVICE();
device.cb = Marshal.SizeOf(device);
// Update remaining devices
for (uint otherid = 0; NativeMethods.EnumDisplayDevices(null, otherid, ref device, 0); otherid++)
{
if (device.StateFlags.HasFlag(DisplayDeviceStateFlags.AttachedToDesktop) && otherid != id)
{
device.cb = Marshal.SizeOf(device);
var otherDeviceMode = new DEVMODE();
NativeMethods.EnumDisplaySettings(device.DeviceName, -1, ref otherDeviceMode);
otherDeviceMode.dmPosition.x -= offsetx;
otherDeviceMode.dmPosition.y -= offsety;
NativeMethods.ChangeDisplaySettingsEx(
device.DeviceName,
ref otherDeviceMode,
(IntPtr)null,
(ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY | ChangeDisplaySettingsFlags.CDS_NORESET),
IntPtr.Zero);
}
device.cb = Marshal.SizeOf(device);
}
// Apply settings
NativeMethods.ChangeDisplaySettingsEx(null, IntPtr.Zero, (IntPtr)null, ChangeDisplaySettingsFlags.CDS_NONE, (IntPtr)null);
}
}
[StructLayout(LayoutKind.Explicit, CharSet = CharSet.Ansi)]
public struct DEVMODE
{
public const int CCHDEVICENAME = 32;
public const int CCHFORMNAME = 32;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHDEVICENAME)]
[System.Runtime.InteropServices.FieldOffset(0)]
public string dmDeviceName;
[System.Runtime.InteropServices.FieldOffset(32)]
public Int16 dmSpecVersion;
[System.Runtime.InteropServices.FieldOffset(34)]
public Int16 dmDriverVersion;
[System.Runtime.InteropServices.FieldOffset(36)]
public Int16 dmSize;
[System.Runtime.InteropServices.FieldOffset(38)]
public Int16 dmDriverExtra;
[System.Runtime.InteropServices.FieldOffset(40)]
public UInt32 dmFields;
[System.Runtime.InteropServices.FieldOffset(44)]
Int16 dmOrientation;
[System.Runtime.InteropServices.FieldOffset(46)]
Int16 dmPaperSize;
[System.Runtime.InteropServices.FieldOffset(48)]
Int16 dmPaperLength;
[System.Runtime.InteropServices.FieldOffset(50)]
Int16 dmPaperWidth;
[System.Runtime.InteropServices.FieldOffset(52)]
Int16 dmScale;
[System.Runtime.InteropServices.FieldOffset(54)]
Int16 dmCopies;
[System.Runtime.InteropServices.FieldOffset(56)]
Int16 dmDefaultSource;
[System.Runtime.InteropServices.FieldOffset(58)]
Int16 dmPrintQuality;
[System.Runtime.InteropServices.FieldOffset(44)]
public POINTL dmPosition;
[System.Runtime.InteropServices.FieldOffset(52)]
public Int32 dmDisplayOrientation;
[System.Runtime.InteropServices.FieldOffset(56)]
public Int32 dmDisplayFixedOutput;
[System.Runtime.InteropServices.FieldOffset(60)]
public short dmColor; // See note below!
[System.Runtime.InteropServices.FieldOffset(62)]
public short dmDuplex; // See note below!
[System.Runtime.InteropServices.FieldOffset(64)]
public short dmYResolution;
[System.Runtime.InteropServices.FieldOffset(66)]
public short dmTTOption;
[System.Runtime.InteropServices.FieldOffset(68)]
public short dmCollate; // See note below!
[System.Runtime.InteropServices.FieldOffset(72)]
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHFORMNAME)]
public string dmFormName;
[System.Runtime.InteropServices.FieldOffset(102)]
public Int16 dmLogPixels;
[System.Runtime.InteropServices.FieldOffset(104)]
public Int32 dmBitsPerPel;
[System.Runtime.InteropServices.FieldOffset(108)]
public Int32 dmPelsWidth;
[System.Runtime.InteropServices.FieldOffset(112)]
public Int32 dmPelsHeight;
[System.Runtime.InteropServices.FieldOffset(116)]
public Int32 dmDisplayFlags;
[System.Runtime.InteropServices.FieldOffset(116)]
public Int32 dmNup;
[System.Runtime.InteropServices.FieldOffset(120)]
public Int32 dmDisplayFrequency;
}
public enum DISP_CHANGE : int
{
Successful = 0,
Restart = 1,
Failed = -1,
BadMode = -2,
NotUpdated = -3,
BadFlags = -4,
BadParam = -5,
BadDualView = -6
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct DISPLAY_DEVICE
{
[MarshalAs(UnmanagedType.U4)]
public int cb;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string DeviceName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string DeviceString;
[MarshalAs(UnmanagedType.U4)]
public DisplayDeviceStateFlags StateFlags;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string DeviceID;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string DeviceKey;
}
[Flags()]
public enum DisplayDeviceStateFlags : int
{
/// <summary>The device is part of the desktop.</summary>
AttachedToDesktop = 0x1,
MultiDriver = 0x2,
/// <summary>The device is part of the desktop.</summary>
PrimaryDevice = 0x4,
/// <summary>Represents a pseudo device used to mirror application drawing for remoting or other purposes.</summary>
MirroringDriver = 0x8,
/// <summary>The device is VGA compatible.</summary>
VGACompatible = 0x10,
/// <summary>The device is removable; it cannot be the primary display.</summary>
Removable = 0x20,
/// <summary>The device has more display modes than its output devices support.</summary>
ModesPruned = 0x8000000,
Remote = 0x4000000,
Disconnect = 0x2000000,
}
[Flags()]
public enum ChangeDisplaySettingsFlags : uint
{
CDS_NONE = 0,
CDS_UPDATEREGISTRY = 0x00000001,
CDS_TEST = 0x00000002,
CDS_FULLSCREEN = 0x00000004,
CDS_GLOBAL = 0x00000008,
CDS_SET_PRIMARY = 0x00000010,
CDS_VIDEOPARAMETERS = 0x00000020,
CDS_ENABLE_UNSAFE_MODES = 0x00000100,
CDS_DISABLE_UNSAFE_MODES = 0x00000200,
CDS_RESET = 0x40000000,
CDS_RESET_EX = 0x20000000,
CDS_NORESET = 0x10000000
}
public class NativeMethods
{
[DllImport("user32.dll")]
public static extern DISP_CHANGE ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd, ChangeDisplaySettingsFlags dwflags, IntPtr lParam);
[DllImport("user32.dll")]
// A signature for ChangeDisplaySettingsEx with a DEVMODE struct as the second parameter won't allow you to pass in IntPtr.Zero, so create an overload
public static extern DISP_CHANGE ChangeDisplaySettingsEx(string lpszDeviceName, IntPtr lpDevMode, IntPtr hwnd, ChangeDisplaySettingsFlags dwflags, IntPtr lParam);
[DllImport("user32.dll")]
public static extern bool EnumDisplayDevices(string lpDevice, uint iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);
[DllImport("user32.dll")]
public static extern bool EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);
}
[StructLayout(LayoutKind.Sequential)]
public struct POINTL
{
public int x;
public int y;
}
Je suis sur le point d'essayer ce code sortir et expérience, mais pouvez-vous commenter un peu sur ce que la stratégie pour déplacer les positions des autres moniteurs devrait être? Je n'ai pas trouvé beaucoup de documentation sur MSDN sur ce que signifient les positions et comment elles doivent se relier, qu'elles soient négatives ou positives, etc. Votre exemple déplace tous les autres moniteurs vers la gauche et vers le haut par la position précédente du nouveau moniteur principal - quelle est la raison d'agir ainsi? Pas tout à fait le voir. – user1454265
Je suppose pour faire une conjecture - je suppose que tout le plan 2D est juste jeu, positif ou négatif, et le positionnement relatif importe juste pour boucler la souris? – user1454265
Je n'ai pas la chance de l'essayer en ce moment @ user1454265 (donc j'espère que vous vérifierez ce que je dis quand vous faites), mais je me souviens que le coin supérieur gauche du moniteur principal est toujours (0 , 0), donc j'ai écrit ce qui précède de telle sorte que les moniteurs conservent leur positionnement relatif lorsque vous changez le primaire (crucial pour moi d'autant plus que j'ai trois moniteurs de tailles différentes dans des endroits impairs). – ADBailey