/// <summary>
/// Retrieve display settings.
/// </summary>
/// <param name="displayIndex">Index of the display/adapter of interest.</param>
/// <param name="type">Whether to retrieve the currently active settings or those stored in the registry for that display/adapter.</param>
public static DisplaySettings GetDisplaySettings(int displayIndex, SettingsType type = SettingsType.Current)
{
displayIndex = Math.Max(displayIndex, 0);
DISPLAY_DEVICE d = DISPLAY_DEVICE.Create();
DEVMODE dm = DEVMODE.Create();
EnumDisplayDevices(null, (uint)displayIndex, ref d, 1);
var isAttached = ((DisplayInformation.DisplayDeviceStateFlags)d.StateFlags).HasFlag(DisplayInformation.DisplayDeviceStateFlags.AttachedToDesktop);
EnumDisplaySettingsEx(d.DeviceName, (int)type, ref dm, 0);
var displaySettings = new DisplaySettings()
{
DisplayIndex = displayIndex,
Mode = new GraphicsMode
{
Width = (int)dm.dmPelsWidth,
Height = (int)dm.dmPelsHeight,
RefreshRate = (int)dm.dmDisplayFrequency,
BitDepth = (int)dm.dmBitsPerPel
},
DesktopPosition = new Position {
X = dm.dmPosition.x, Y = dm.dmPosition.y
},
IsAttached = isAttached
};
// Find mode number
displaySettings.Mode.Index = -1;
for (int iModeNum = 0; EnumDisplaySettingsEx(d.DeviceName, iModeNum, ref dm, 0) != 0; iModeNum++)
{
var isModeMatch = displaySettings.Mode.Width == dm.dmPelsWidth &&
displaySettings.Mode.Height == dm.dmPelsHeight &&
displaySettings.Mode.RefreshRate == dm.dmDisplayFrequency &&
displaySettings.Mode.BitDepth == dm.dmBitsPerPel;
if (isModeMatch)
{
displaySettings.Mode.Index = iModeNum;
break;
}
}
return(displaySettings);
}
/// <summary>
/// Change settings of a display.
/// </summary>
/// <param name="displaySettings">The settings to apply.</param>
/// <returns>Result of the operation including a description.</returns>
public static DisplaySettingsChangedResult ChangeDisplaySettings(DisplaySettings displaySettings)
{
displaySettings.DisplayIndex = Math.Max(displaySettings.DisplayIndex, 0);
DISPLAY_DEVICE d = DISPLAY_DEVICE.Create();
DEVMODE dm = DEVMODE.Create();
EnumDisplayDevices(null, (uint)displaySettings.DisplayIndex, ref d, 1);
if (0 != EnumDisplaySettingsEx(d.DeviceName, ENUM_CURRENT_SETTINGS, ref dm, 0))
{
dm.dmPelsWidth = (uint)displaySettings.Mode.Width;
dm.dmPelsHeight = (uint)displaySettings.Mode.Height;
dm.dmDisplayFrequency = (uint)displaySettings.Mode.RefreshRate;
dm.dmBitsPerPel = (uint)displaySettings.Mode.BitDepth;
dm.dmPosition.x = displaySettings.DesktopPosition.X;
dm.dmPosition.y = displaySettings.DesktopPosition.Y;
int iRet = ChangeDisplaySettingsEx(d.DeviceName, ref dm, IntPtr.Zero, ChangeDisplaySettingsFlags.CDS_TEST, IntPtr.Zero);
if (iRet == (int)DisplaySettingsChangedResult.ChangeStatus.FAILED)
{
return(new DisplaySettingsChangedResult(iRet));
}
else
{
iRet = ChangeDisplaySettingsEx(d.DeviceName, ref dm, IntPtr.Zero, ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
return(new DisplaySettingsChangedResult(iRet));
}
}
else
{
return(new DisplaySettingsChangedResult(DisplaySettingsChangedResult.ChangeStatus.BADMODE));
}
}
