pinvoke.net: Edit: user32.enumdisplaysettings

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Summary: The EnumDisplaySettings API enumerates the display settings for the machine (surprise!). It returns a DEVMODE struct which contains the current settings. Use ChangeDisplaySettings to change those values.

!!!!C# Signature:
 [DllImport("user32.dll")]
 public static extern bool EnumDisplaySettings (string deviceName, int modeNum, ref DEVMODE devMode );

!!!!VB.NET Signature:
 <DllImport("user32")> _
 Public Function EnumDisplaySettings(ByVal deviceName As String, ByVal modeNum As Integer, ByRef devMode As DEVMODE) As Boolean
 End Function

!!!!User-Defined Types:
[DEVMODE]

!!!!Notes:
 const int ENUM_CURRENT_SETTINGS = -1;
 const int ENUM_REGISTRY_SETTINGS = -2;

See also: EnumDisplaySettingsEx

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:

http://www.codeproject.com/csharp/CSDynamicScrRes.asp?df=100&forumid=38736&select=800137

using System.Runtime.InteropServices;
 [StructLayout(LayoutKind.Sequential)]
 public struct DEVMODE
 {
    private const int CCHDEVICENAME = 0x20;
    private const int CCHFORMNAME = 0x20;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
    public string dmDeviceName;
    public short dmSpecVersion;
    public short dmDriverVersion;
    public short dmSize;
    public short dmDriverExtra;
    public int dmFields;
    public int dmPositionX;
    public int dmPositionY;
    public ScreenOrientation dmDisplayOrientation;
    public int dmDisplayFixedOutput;
    public short dmColor;
    public short dmDuplex;
    public short dmYResolution;
    public short dmTTOption;
    public short dmCollate;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
    public string dmFormName;
    public short dmLogPixels;
    public int dmBitsPerPel;
    public int dmPelsWidth;
    public int dmPelsHeight;
    public int dmDisplayFlags;
    public int dmDisplayFrequency;
    public int dmICMMethod;
    public int dmICMIntent;
    public int dmMediaType;
    public int dmDitherType;
    public int dmReserved1;
    public int dmReserved2;
    public int dmPanningWidth;
    public int dmPanningHeight;
 }

[DllImport("user32.dll")]
 public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);

private void button1_Click(object sender, EventArgs e)
 {   
    DEVMODE vDevMode = new DEVMODE();
    int i = 0;
    while (EnumDisplaySettings(null, i, ref vDevMode))
    {
        Console.WriteLine("Width:{0} Height:{1} Color:{2} Frequency:{3}", 
            vDevMode.dmPelsWidth,
            vDevMode.dmPelsHeight,
            1 << vDevMode.dmBitsPerPel,
            vDevMode.dmDisplayFrequency
        );
        i++;
    }
 }

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

Documentation: EnumDisplaySettings@msdn on MSDN