public static extern bool EnumDisplaySettingsExW(
[param: MarshalAs(UnmanagedType.LPWStr)]
[In] string lpszDeviceName,
[param: MarshalAs(UnmanagedType.U4)]
[In] int iModeNum,
[In, Out] ref DEVMODEW lpDevMode,
[In] int dwFlags);
public static extern int ChangeDisplaySettingsExW(
[param: MarshalAs(UnmanagedType.LPWStr)]
[In] string lpszDeviceName,
[In, Out] ref DEVMODEW lpDevMode,
IntPtr hwnd,
[param: MarshalAs(UnmanagedType.U4)]
[In] uint dwFlags,
[In] IntPtr lParam);
//[MarshalAs(UnmanagedType.ByValArray, SizeConst = privateDriverDataLength)]
//public Byte[] privateDriverData;
public static DEVMODEW InitializeNew()
{
var result = new DEVMODEW()
{
dmDeviceName = new Char[CCHDEVICENAME],
dmFormName = new Char[CCHFORMNAME],
// privateDriverData = new byte[privateDriverDataLength],
dmDriverExtra = privateDriverDataLength,
dmSize = (ushort)Marshal.SizeOf(typeof(DEVMODEW)),
};
return(result);
}
private string GetTextForTextBlock()
{
// 1. Get the window handle ("HWND" in Win32 parlance)
WindowInteropHelper helper = new WindowInteropHelper(this);
IntPtr hwnd = helper.Handle;
// 2. Get a monitor handle ("HMONITOR") for the window.
// If the window is straddling more than one monitor, Windows will pick the "best" one.
IntPtr hmonitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
if (hmonitor == IntPtr.Zero)
{
return("MonitorFromWindow returned NULL ☹");
}
// 3. Get more information about the monitor.
MONITORINFOEXW monitorInfo = new MONITORINFOEXW();
monitorInfo.cbSize = (uint)Marshal.SizeOf <MONITORINFOEXW>();
bool bResult = GetMonitorInfoW(hmonitor, ref monitorInfo);
if (!bResult)
{
return("GetMonitorInfoW returned FALSE ☹");
}
// 4. Get the current display settings for that monitor, which includes the resolution and refresh rate.
DEVMODEW devMode = new DEVMODEW();
devMode.dmSize = (ushort)Marshal.SizeOf <DEVMODEW>();
bResult = EnumDisplaySettingsW(monitorInfo.szDevice, ENUM_CURRENT_SETTINGS, out devMode);
if (!bResult)
{
return("EnumDisplaySettingsW returned FALSE ☹");
}
// Done!
return(string.Format("{0} x {1} @ {2}hz", devMode.dmPelsWidth, devMode.dmPelsHeight, devMode.dmDisplayFrequency));
}
private (MONITORINFO mi, string device, int refreshRate) GetMonitorInfoAndSettings(IntPtr hMonitor)
{
var(mi, device) = GetMonitorInfoEx(hMonitor);
DEVMODEW devMode = default;
if (!EnumDisplaySettings(device, ENUM_DISPLAY_SETTINGS_MODE.ENUM_CURRENT_SETTINGS, ref devMode))
{
if (!IsMonitorValid(hMonitor))
{
throw new InvalidDisplayReferenceException(hMonitor);
}
if (device == VirtualDeviceName)
{
return(mi, device, GetVirtualMonitorRefreshRate());
}
else
{
throw new Win32Exception($"Could not read the settings for monitor \"{device}\".");
}
}
return(mi, device, (int)GetVirtualMonitorRefreshRate());
}
private static extern bool EnumDisplaySettingsW(
[MarshalAs(UnmanagedType.LPWStr)] string lpszDeviceName,
uint iModeNum,
out DEVMODEW lpDevMode);
public static extern BOOL EnumDisplaySettingsW(string lpszDeviceName, ENUM iModeNum, ref DEVMODEW lpDevMode);