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;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices;
/// <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 EnumDesktopWindowsDemo
{
const int MAXTITLE = 255;
private static ArrayList mTitlesList;
private delegate bool EnumDelegate(IntPtr hWnd, int lParam);
[DllImport("user32.dll", EntryPoint="EnumDesktopWindows",
ExactSpelling=false, CharSet=CharSet.Auto, SetLastError=true)]
private static extern bool _EnumDesktopWindows(IntPtr hDesktop,
EnumDelegate lpEnumCallbackFunction, IntPtr lParam);
[DllImport("user32.dll", EntryPoint="GetWindowText",
ExactSpelling=false, CharSet=CharSet.Auto, SetLastError=true)]
private static extern int _GetWindowText(IntPtr hWnd,
StringBuilder lpWindowText, int nMaxCount);
private static bool EnumWindowsProc(IntPtr hWnd, int lParam)
{
string title = GetWindowText(hWnd);
mTitlesList.Add(title);
return true;
}
/// <summary>
/// Returns the caption of a windows by given HWND identifier.
/// </summary>
public static string GetWindowText(IntPtr hWnd)
{
StringBuilder title = new StringBuilder(MAXTITLE);
int titleLength = _GetWindowText(hWnd, title, title.Capacity + 1);
title.Length = titleLength;
return title.ToString();
}
/// <summary>
/// Returns the caption of all desktop windows.
/// </summary>
public static string[] GetDesktopWindowsCaptions()
{
mTitlesList = new ArrayList();
EnumDelegate enumfunc = new EnumDelegate(EnumWindowsProc);
IntPtr hDesktop = IntPtr.Zero; // current desktop
bool success = _EnumDesktopWindows(hDesktop, enumfunc, IntPtr.Zero);
if (success)
{
// Copy the result to string array
string[] titles = new string[mTitlesList.Count];
mTitlesList.CopyTo(titles);
return titles;
}
else
{
// Get the last Win32 error code
int errorCode = Marshal.GetLastWin32Error();
string errorMessage = String.Format(
"EnumDesktopWindows failed with code {0}.", errorCode);
throw new Exception(errorMessage);
}
}
static void Main()
{
string[] desktopWindowsCaptions = GetDesktopWindowsCaptions();
foreach (string caption in desktopWindowsCaptions)
{
Console.WriteLine(caption);
}
}
}
Alternative Managed API:
Do you know one? Please contribute it!
