C# Signature:

[DllImport("user32.dll")]
static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr lprcClip,
   EnumMonitorsDelegate lpfnEnum, IntPtr dwData);

Vb.Net Signature:

<DllImport("user32.dll")> _
Private Shared Function EnumDisplayMonitors(ByVal hdc As IntPtr, ByVal lprcClip As IntPtr, ByVal lpfnEnum As EnumMonitorsDelegate, ByVal dwData As IntPtr) As Boolean
End Function

User-Defined Types:

None.

Notes:

Please add some!

Tips & Tricks:

Please add some!

Sample Code:

    delegate bool MonitorEnumDelegate(IntPtr hMonitor, IntPtr hdcMonitor, ref Rect lprcMonitor, IntPtr dwData);

    [StructLayout(LayoutKind.Sequential)]
    public struct Rect
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
    }

    /// <summary>
    /// The struct that contains the display information
    /// </summary>
    public class DisplayInfo
    {
        public string Availability { get; set; }
        public string ScreenHeight { get; set; }
        public string ScreenWidth { get; set; }
        public Rect MonitorArea { get; set; }
        public Rect WorkArea { get; set; }
    }

    /// <summary>
    /// Collection of display information
    /// </summary>
    public class DisplayInfoCollection : List<DisplayInfo>
    {
    }

    /// <summary>
    /// Returns the number of Displays using the Win32 functions
    /// </summary>
    /// <returns>collection of Display Info</returns>
    public DisplayInfoCollection GetDisplays()
    {
    DisplayInfoCollection col = new DisplayInfoCollection();

    EnumDisplayMonitors( IntPtr.Zero, IntPtr.Zero,
        delegate (IntPtr hMonitor, IntPtr hdcMonitor, ref Rect lprcMonitor,  IntPtr dwData)
        {
        MonitorInfo mi = new MonitorInfo();
        mi.size = (uint)Marshal.SizeOf(mi);
        bool success = GetMonitorInfo(hMonitor, ref mi);
        if (success)
        {
            DisplayInfo di = new DisplayInfo();
            di.ScreenWidth = (mi.monitor.right - mi.monitor.left).ToString();
            di.ScreenHeight = (mi.monitor.bottom - mi.monitor.top).ToString();
            di.MonitorArea = mi.monitor;
            di.WorkArea = mi.work;
            di.Availability = mi.flags.ToString();
            col.Add(di);
        }
        return true;
         }, IntPtr.Zero );
     return col;
    }

Alternative Managed API:

Use System.Windows.Forms.Screen.AllScreens to get an array of all displays on the system.

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).