/// <summary>Returns a read-only collection containing information about all the graphics modes for a display device.</summary>
/// <param name="deviceName">A string that specifies the display device about which graphics modes the function will obtain information.
/// <para>This parameter is either null or a <see cref="DisplayDevice.DeviceName"/> returned from EnumDisplayDevicesW.</para>
/// A null value specifies the current display device on the computer that the calling thread is running on.</param>
/// <param name="options">One or more <see cref="EnumDisplaySettingsExOptions"/>.</param>
/// <returns>Returns a read-only collection containing information about all the graphics modes for a display device.</returns>
private static ReadOnlyCollection <DisplayDeviceMode> EnumDisplaySettingsEx(string deviceName, EnumDisplaySettingsExOptions options)
{
var modes = new List <DisplayDeviceMode>();
var devMode = DisplayDeviceMode.Default;
var modeIndex = 0;
while (NativeMethods.EnumDisplaySettingsExW(deviceName, modeIndex++, ref devMode, options))
{
if (!devMode.Width.HasValue || !devMode.Height.HasValue || !devMode.DisplayFrequency.HasValue)
{
continue;
}
// basic filtering: we don't need display modes whose width, height or frequency is missing.
if (!devMode.BitsPerPixel.HasValue || devMode.BitsPerPixel.Value != 32)
{
continue;
}
// 8, 16 and 24 bpp modes are no more supported, since Windows 7.
if (devMode.IsGrayscale.HasValue && devMode.IsGrayscale.Value)
{
continue;
}
// Only 32 bpp modes are supported, so grayscale modes should be safely ignored.
modes.Add(devMode);
}
if (modes.Count > 1)
{
modes.Sort((DisplayDeviceMode mode, DisplayDeviceMode other) => { return(-mode.CompareTo(other)); });
}
return(new ReadOnlyCollection <DisplayDeviceMode>(modes));
}
/// <summary>Returns information about the display mode of a display adapter, as stored in the registry.</summary>
/// <param name="deviceName">A string that specifies the display device about which graphics mode the function will obtain information.
/// <para>This parameter is either null or a <see cref="DisplayDevice.DeviceName"/> returned from <see cref="NativeMethods.EnumDisplayDevicesW"/>.</para>
/// A null value specifies the current display device on the computer that the calling thread is running on.</param>
/// <param name="options">One or more <see cref="EnumDisplaySettingsExOptions"/>.</param>
/// <returns>Returns information about the display mode of a display adapter, as stored in the registry.</returns>
private static DisplayDeviceMode GetRegistryDisplaySettingsEx(string deviceName, EnumDisplaySettingsExOptions options)
{
var output = DisplayDeviceMode.Default;
if (!NativeMethods.EnumDisplaySettingsExW(deviceName, -2, ref output, options))
{
output = DisplayDeviceMode.Default;
}
return(output);
}
/// <summary>Returns information about the display mode of a display adapter, as stored in the registry.</summary>
/// <param name="deviceName">A string that specifies the display device about which graphics mode the function will obtain information.
/// <para>This parameter is either null or a <see cref="DisplayDevice.DeviceName"/> returned from <see cref="EnumDisplayDevicesW"/>.</para>
/// A null value specifies the current display device on the computer that the calling thread is running on.</param>
/// <param name="options">One or more <see cref="EnumDisplaySettingsExOptions"/>.</param>
/// <returns>Returns information about the display mode of a display adapter, as stored in the registry.</returns>
internal static DisplayDeviceMode GetRegistryDisplaySettingsEx( string deviceName, EnumDisplaySettingsExOptions options )
{
var output = DisplayDeviceMode.Default;
if( !EnumDisplaySettingsExW( deviceName, -2, ref output, options ) )
output = DisplayDeviceMode.Default;
return output;
}
internal static extern bool EnumDisplaySettingsExW(
[In, MarshalAs(UnmanagedType.LPWStr)] string deviceName,
[In] int modeIndex,
[In, Out] ref DisplayDeviceMode devMode,
[In] EnumDisplaySettingsExOptions options
);
//BOOL EnumDisplaySettingsEx(
// _In_opt_ LPCWSTR lpszDeviceName,
// _In_ DWORD iModeNum,
// _Inout_ DEVMODEW* lpDevMode,
// _In_ DWORD dwFlags);
/// <summary>Returns a read-only collection containing information about all the graphics modes for a display device.</summary>
/// <param name="deviceName">A string that specifies the display device about which graphics modes the function will obtain information.
/// <para>This parameter is either null or a <see cref="DisplayDevice.DeviceName"/> returned from <see cref="EnumDisplayDevicesW"/>.</para>
/// A null value specifies the current display device on the computer that the calling thread is running on.</param>
/// <param name="options">One or more <see cref="EnumDisplaySettingsExOptions"/>.</param>
/// <returns>Returns a read-only collection containing information about all the graphics modes for a display device.</returns>
internal static ReadOnlyDisplayDeviceModeCollection EnumDisplaySettingsEx( string deviceName, EnumDisplaySettingsExOptions options )
{
var modes = new List<DisplayDeviceMode>();
var devMode = DisplayDeviceMode.Default;
var modeIndex = 0;
while( EnumDisplaySettingsExW( deviceName, modeIndex++, ref devMode, options ) )
{
if( !devMode.Width.HasValue || !devMode.Height.HasValue || !devMode.DisplayFrequency.HasValue )
continue;
// basic filtering: we don't need display modes whose width, height or frequency is missing.
if( !devMode.BitsPerPixel.HasValue || devMode.BitsPerPixel.Value != 32 )
continue;
// 8, 16 and 24 bpp modes are no more supported, since Windows 7.
if( devMode.IsGrayscale.HasValue && devMode.IsGrayscale.Value )
continue;
// Only 32 bpp modes are supported, so grayscale modes should be safely ignored.
modes.Add( devMode );
}
if( modes.Count > 1 )
modes.Sort( ( DisplayDeviceMode mode, DisplayDeviceMode other ) => { return -mode.CompareTo( other ); } );
return new ReadOnlyDisplayDeviceModeCollection( modes );
}
