/// <summary>
/// A private helper method used to retrieve current display settings as a DEVMODE object.
/// </summary>
/// <remarks>
/// Internally calls EnumDisplaySettings() native function with the value ENUM_CURRENT_SETTINGS (-1) to retrieve the current settings.
/// </remarks>
private static SafeNativeMethods.DEVMODE GetDeviceMode(DisplayDevice dev, bool def)
{
SafeNativeMethods.DEVMODE mode = new SafeNativeMethods.DEVMODE();
mode.Initialize();
if (def)
{
if (SafeNativeMethods.EnumDisplaySettings(null, SafeNativeMethods.ENUM_CURRENT_SETTINGS, ref mode))
return mode;
else
//throw new InvalidOperationException(GetLastError());
throw new InvalidOperationException("Hello");
}
else
{
//if (SafeNativeMethods.EnumDisplaySettings(dev.DeviceName, 0, ref mode))
if(SafeNativeMethods.EnumDisplaySettingsEx(dev.DeviceName, -2, ref mode, (uint)CDSFlags.CDS_RESET) )
return mode;
else
//throw new InvalidOperationException(GetLastError());
throw new InvalidOperationException("Hello1");
}
}
/// <summary>
/// Changes the current display settings with the new settings provided. May throw InvalidOperationException if failed. Check the exception message for more details.
/// </summary>
/// <param name="set">The new settings.</param>
/// <remarks>
/// Internally calls ChangeDisplaySettings() native function.
/// </remarks>
public static string SetDisplaySettings(DisplaySettings set, DisplayDevice dev, bool primary)
{
SafeNativeMethods.DEVMODE mode = new SafeNativeMethods.DEVMODE();
mode.dmPelsWidth = (uint)set.Width;
mode.dmPelsHeight = (uint)set.Height;
mode.dmDisplayOrientation = (uint)set.Orientation;
mode.dmBitsPerPel = (uint)set.BitCount;
mode.dmDisplayFrequency = (uint)set.Frequency;
if (primary)
{
mode.dmPosition.x = 0;
mode.dmPosition.y = 0;
}
else
{
mode.dmPosition.x = -set.Width -1;
mode.dmPosition.y = 0;
}
uint flags;
if (primary)
flags = (uint)(CDSFlags.CDS_RESET | CDSFlags.CDS_UPDATEREGISTRY | CDSFlags.CDS_SET_PRIMARY );
else
flags = (uint)(CDSFlags.CDS_RESET | CDSFlags.CDS_UPDATEREGISTRY);
mode.dmFields = (uint)(SafeNativeMethods.DM.Position | SafeNativeMethods.DM.PelsHeight | SafeNativeMethods.DM.PelsWidth|
SafeNativeMethods.DM.DisplayFrequency | SafeNativeMethods.DM.DisplayOrientation|
SafeNativeMethods.DM.BitsPerPixel);
mode.dmSize = (ushort)Marshal.SizeOf(mode);
DisplayChangeResult result = (DisplayChangeResult)
SafeNativeMethods.ChangeDisplaySettingsEx(dev.DeviceName, ref mode, IntPtr.Zero, flags, IntPtr.Zero);
string msg = "Successfully changed the settings!";
switch (result)
{
case DisplayChangeResult.BadDualView:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadDualView;
break;
case DisplayChangeResult.BadParam:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadParam;
break;
case DisplayChangeResult.BadFlags:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadFlags;
break;
case DisplayChangeResult.NotUpdated:
msg = Properties.Resources.InvalidOperation_Disp_Change_NotUpdated;
break;
case DisplayChangeResult.BadMode:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadMode;
break;
case DisplayChangeResult.Failed:
msg = Properties.Resources.InvalidOperation_Disp_Change_Failed;
break;
case DisplayChangeResult.Restart:
msg = Properties.Resources.InvalidOperation_Disp_Change_Restart;
break;
}
return msg;
}
/// <summary>
/// Enumerates all supported display modes.
/// </summary>
/// <remarks>
/// Internally calls EnumDisplaySettings() native function.
/// Because of the nature of EnumDisplaySettings() it calls it many times and uses the <code>yield return</code> statement to simulate an enumerator.
/// </remarks>
public static IEnumerator<DisplaySettings> GetModesEnumerator(string devName)
{
SafeNativeMethods.DEVMODE mode = new SafeNativeMethods.DEVMODE();
mode.Initialize();
// mode.dmDeviceName = devName;
int idx = 0;
while (SafeNativeMethods.EnumDisplaySettingsEx(devName, idx, ref mode, 0))
{
yield return CreateDisplaySettingsObject(idx++, mode);
}
}
public static string enableDevice(DisplayDevice dev)
{
SafeNativeMethods.DEVMODE dm = new SafeNativeMethods.DEVMODE();
SafeNativeMethods.POINTL enabledPosition = new SafeNativeMethods.POINTL();
enabledPosition.x = -1280;
enabledPosition.y = 0;
dm.dmPosition = enabledPosition;
dm.dmFields = (uint)SafeNativeMethods.DM.Position;
dm.dmSize = (ushort)Marshal.SizeOf(dm);
DisplayChangeResult result = (DisplayChangeResult)
SafeNativeMethods.ChangeDisplaySettingsEx(dev.DeviceName, ref dm, IntPtr.Zero, (uint)CDSFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
string msg = "Successfully enabled the device!";
switch (result)
{
case DisplayChangeResult.BadDualView:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadDualView;
break;
case DisplayChangeResult.BadParam:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadParam;
break;
case DisplayChangeResult.BadFlags:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadFlags;
break;
case DisplayChangeResult.NotUpdated:
msg = Properties.Resources.InvalidOperation_Disp_Change_NotUpdated;
break;
case DisplayChangeResult.BadMode:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadMode;
break;
case DisplayChangeResult.Failed:
msg = Properties.Resources.InvalidOperation_Disp_Change_Failed;
break;
case DisplayChangeResult.Restart:
msg = Properties.Resources.InvalidOperation_Disp_Change_Restart;
break;
}
return msg;
}
public static string disableDevice(DisplayDevice dev)
{
SafeNativeMethods.DEVMODE mode = new SafeNativeMethods.DEVMODE();
/*
mode.dmPelsWidth = 0;
mode.dmPelsHeight = 0;
mode.dmDisplayOrientation = 0;
uint flags;
flags = (uint)(CDSFlags.CDS_RESET | CDSFlags.CDS_UPDATEREGISTRY);
mode.dmFields = (uint)(SafeNativeMethods.DM.PelsHeight | SafeNativeMethods.DM.PelsWidth);
*/
mode.dmSize = (ushort)Marshal.SizeOf(mode);
DisplayChangeResult result = (DisplayChangeResult)
SafeNativeMethods.ChangeDisplaySettingsEx(dev.DeviceName, 0,0, 0, 0);
string msg = "Successfully disabled the device!";
switch (result)
{
case DisplayChangeResult.BadDualView:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadDualView;
break;
case DisplayChangeResult.BadParam:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadParam;
break;
case DisplayChangeResult.BadFlags:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadFlags;
break;
case DisplayChangeResult.NotUpdated:
msg = Properties.Resources.InvalidOperation_Disp_Change_NotUpdated;
break;
case DisplayChangeResult.BadMode:
msg = Properties.Resources.InvalidOperation_Disp_Change_BadMode;
break;
case DisplayChangeResult.Failed:
msg = Properties.Resources.InvalidOperation_Disp_Change_Failed;
break;
case DisplayChangeResult.Restart:
msg = Properties.Resources.InvalidOperation_Disp_Change_Restart;
break;
}
return msg;
}
public static void AttachSecondMonitor(DisplayDevice dev)
{
SafeNativeMethods.DEVMODE mode = new SafeNativeMethods.DEVMODE();
//ZeroMemory(&mode, sizeof(DEVMODE));
mode.dmBitsPerPel = 32;
mode.dmPelsWidth = 1920;
mode.dmPelsHeight = 1200;
mode.dmPosition.x = -1920;
mode.dmPosition.y = 0;
mode.dmDisplayFrequency = 60;
mode.dmDisplayOrientation = 0;
mode.dmFields = (uint)(SafeNativeMethods.DM.PelsWidth | SafeNativeMethods.DM.PelsHeight | SafeNativeMethods.DM.BitsPerPixel |
SafeNativeMethods.DM.Position | SafeNativeMethods.DM.DisplayFrequency |
SafeNativeMethods.DM.DisplayFlags | SafeNativeMethods.DM.Orientation);
mode.dmSize = (ushort)Marshal.SizeOf(mode);
DisplayChangeResult result = (DisplayChangeResult)SafeNativeMethods.ChangeDisplaySettingsEx(dev.DeviceName, ref mode, IntPtr.Zero, (uint)(CDSFlags.CDS_UPDATEREGISTRY | CDSFlags.CDS_NORESET), IntPtr.Zero);
if (result == 0)
{
Console.WriteLine("Success");
//ChangeDisplaySettingsEx(NULL, NULL, NULL, 0, NULL);
}
else
{
Console.WriteLine(result.ToString());
}
}