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!

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).