/// <summary>
/// Changes the display settings
/// </summary>
/// <param name="width" />
/// <param name="height" />
public bool ChangeDisplaySettings(int width, int height)
{
_oldDevmode = new Devmode();
_oldDevmode.dmSize = (ushort)Marshal.SizeOf(_oldDevmode);
// Retrieving current settings
// to edit them
EnumDisplaySettings(null,
EnumCurrentSettings,
ref _oldDevmode);
// Making a copy of the current settings
// to allow reseting to the original mode
var newMode = _oldDevmode;
// Changing the settings
newMode.dmPelsWidth = (uint)width;
newMode.dmPelsHeight = (uint)height;
// Capturing the operation result, 1 = update registry
var result =
ChangeDisplaySettings(ref newMode, 1);
switch (result)
{
case DispChangeSuccessful:
return(true);
case DispChangeBadmode:
MessageBox.Show("Mode not supported.");
return(false);
case DispChangeRestart:
MessageBox.Show("Restart required.");
return(false);
default:
MessageBox.Show("Failed. Error code = " + result);
return(false);
}
}
/// <summary>
/// Checks if the given display mode is supported
/// </summary>
/// <param name="width" />
/// <param name="height" />
/// <param name="supportedModes" />
/// <returns>
public bool IsDisplayModeSupported(int width, int height, out string supportedModes)
{
var mode = new Devmode();
mode.dmSize = (ushort)Marshal.SizeOf(mode);
var modeIndex = 0; // 0 = The first mode
supportedModes = string.Empty;
var previousSupportedMode = string.Empty;
while (EnumDisplaySettings(null,
modeIndex,
ref mode)) // Mode found
{
if (mode.dmPelsWidth == (uint)width && mode.dmPelsHeight == (uint)height)
{
return(true);
}
var newSupportedMode = mode.dmPelsWidth + "x" + mode.dmPelsHeight;
if (newSupportedMode != previousSupportedMode)
{
if (supportedModes == string.Empty)
{
supportedModes += newSupportedMode;
}
else
{
supportedModes += ", " + newSupportedMode;
}
previousSupportedMode = newSupportedMode;
}
modeIndex++; // The next mode
}
return(false);
}
public bool ChangeToMaxResolution(string displayName)
{
Devmode CreateDevMove()
{
var _mode = new Devmode();
_mode.dmSize = (ushort)Marshal.SizeOf(_mode);
return(_mode);
}
Console.WriteLine("Trying with monitor " + displayName);
var modeLst = new List <Devmode>();
var modeIndex = 0; // 0 = The first mode
Devmode mode = CreateDevMove();
while (EnumDisplaySettings(displayName.ToLPTStr(), modeIndex, ref mode))
{
modeLst.Add(mode);
//Console.WriteLine(String.Format("{2} {0}x{1}", mode.dmPelsWidth, mode.dmPelsHeight, mode.dmDeviceName));
mode = CreateDevMove();
modeIndex++;
}
for (int i = modeLst.Count - 1; i >= 0; i--)
{
mode = modeLst[i];
Console.WriteLine(String.Format("{2} {0}x{1}", mode.dmPelsWidth, mode.dmPelsHeight, mode.dmDeviceName));
var ret = ChangeDisplaySettingsEx(displayName, ref mode, IntPtr.Zero, ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
switch (ret)
{
case DISP_CHANGE.Successful:
Console.WriteLine("Successful");
break;
case DISP_CHANGE.Restart:
Console.WriteLine("Restart");
break;
case DISP_CHANGE.Failed:
Console.WriteLine("Failed");
break;
case DISP_CHANGE.BadMode:
Console.WriteLine("BadMode");
break;
case DISP_CHANGE.NotUpdated:
break;
case DISP_CHANGE.BadFlags:
break;
case DISP_CHANGE.BadParam:
break;
case DISP_CHANGE.BadDualView:
break;
default:
break;
}
if (ret == DISP_CHANGE.Successful)
{
return(true);
}
}
return(false);
}
static extern DISP_CHANGE ChangeDisplaySettingsEx(string lpszDeviceName, ref Devmode lpDevMode, IntPtr hwnd, ChangeDisplaySettingsFlags dwflags, IntPtr lParam);
private static extern int ChangeDisplaySettings(
[In, Out] ref Devmode lpDevMode,
[param: MarshalAs(UnmanagedType.U4)] uint dwflags);
private static extern Boolean EnumDisplaySettings(
byte[] lpszDeviceName,
[param: MarshalAs(UnmanagedType.U4)] int iModeNum,
[In, Out] ref Devmode lpDevMode);
