C# Signature:

[DllImport("user32.dll")]
static extern bool EnumDesktopWindows(IntPtr hDesktop,
   EnumDesktopWindowsDelegate lpfn, IntPtr lParam);

User-Defined Types:

private delegate bool EnumDesktopWindowsDelegate(IntPtr hWnd, int lParam);

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

using System.Collections.Generic;
using System.Runtime.InteropServices;
using System;
using System.Text;

/// <summary>
/// EnumDesktopWindows Demo - shows the caption of all desktop windows.
/// Authors: Svetlin Nakov, Martin Kulov
/// Bulgarian Association of Software Developers - http://www.devbg.org/en/
/// </summary>
public class user32
{
    /// <summary>
    /// filter function
    /// </summary>
    /// <param name="hWnd"></param>
    /// <param name="lParam"></param>
    /// <returns></returns>
    public delegate bool EnumDelegate(IntPtr hWnd, int lParam);

    /// <summary>
    /// check if windows visible
    /// </summary>
    /// <param name="hWnd"></param>
    /// <returns></returns>
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool IsWindowVisible(IntPtr hWnd);

    /// <summary>
    /// return windows text
    /// </summary>
    /// <param name="hWnd"></param>
    /// <param name="lpWindowText"></param>
    /// <param name="nMaxCount"></param>
    /// <returns></returns>
    [DllImport("user32.dll", EntryPoint = "GetWindowText",
    ExactSpelling = false, CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpWindowText, int nMaxCount);

    /// <summary>
    /// enumarator on all desktop windows
    /// </summary>
    /// <param name="hDesktop"></param>
    /// <param name="lpEnumCallbackFunction"></param>
    /// <param name="lParam"></param>
    /// <returns></returns>
    [DllImport("user32.dll", EntryPoint = "EnumDesktopWindows",
    ExactSpelling = false, CharSet = CharSet.Auto, SetLastError = true)]
    public static extern bool EnumDesktopWindows(IntPtr hDesktop, EnumDelegate lpEnumCallbackFunction, IntPtr lParam);

    /// <summary>
    /// entry point of the program
    /// </summary>
    static void Main()
    {
    var collection = new List<string>();
    user32.EnumDelegate filter = delegate(IntPtr hWnd, int lParam)
    {
        StringBuilder strbTitle = new StringBuilder(255);
        int nLength = user32.GetWindowText(hWnd, strbTitle, strbTitle.Capacity + 1);
        string strTitle = strbTitle.ToString();

        if (user32.IsWindowVisible(hWnd) && string.IsNullOrEmpty(strTitle) == false)
        {
        collection.Add(strTitle);
        }
        return true;
    };

    if (user32.EnumDesktopWindows(IntPtr.Zero, filter, IntPtr.Zero))
    {
        foreach (var item in collection)
        {
        Console.WriteLine(item);
        }
    }
    Console.Read();
    }
}

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).