!!!!C# Signature: [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool EnumThreadWindows(uint dwThreadId, EnumThreadDelegate lpfn, IntPtr lParam); !!!!VB.NET Signature: <DllImport("user32.dll")>_ Friend Shared Function EnumThreadWindows(dwThreadId as Int32, lpfn as EnumThreadDelegate, lParam as IntPtr) as Boolean End Function !!!!User-Defined Types: public delegate bool EnumThreadDelegate (IntPtr hwnd, IntPtr lParam); !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!! C# Sample: using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Diagnostics; using System.Runtime.InteropServices; using System.Threading; namespace ExitApp { public class ExitApp { private const UInt32 WM_CLOSE = 0x0010; public delegate bool EnumThreadDelegate (IntPtr hWnd, IntPtr lParam); [DllImport("user32.dll")] static extern bool EnumThreadWindows(uint dwThreadId, EnumThreadDelegate lpfn, IntPtr lParam); [DllImport("user32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam); [STAThread] static void Main(string[] args) { // Find process. Process[] p = Process.GetProcessesByName(args[0]); if (p.Length > 0) { foreach(Process proc in p) { // Check if main window exists. If the window is minimized to the tray this might be not the case. if (proc.MainWindowHandle == IntPtr.Zero) { // Try closing application by sending WM_CLOSE to all child windows in all threads. foreach (ProcessThread pt in proc.Threads) { EnumThreadWindows((uint) pt.Id, new EnumThreadDelegate(ExitApp.EnumThreadCallback), IntPtr.Zero); } } else { // Try to close main window. if(proc.CloseMainWindow()) { // Free resources used by this Process object. proc.Close(); } } } } } static bool EnumThreadCallback(IntPtr hWnd, IntPtr lParam) { // Close the enumerated window. PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero); return true; } } } !!!!VB.NET Sample Imports System Imports System.Drawing Imports System.Collections Imports System.ComponentModel Imports System.Windows.Forms Imports System.Data Imports System.Diagnostics Imports System.Runtime.InteropServices Imports System.Threading Public Class ExitApp Private Const WM_CLOSE As UInt32 = &H10 Delegate Function EnumThreadDelegate(hWnd As IntPtr, lParam As IntPtr) As Boolean <DllImport("user32.dll")> _ Shared Function EnumThreadWindows(dwThreadId As UInteger, lpfn As EnumThreadDelegate, lParam As IntPtr) As Boolean <DllImport("user32.dll", SetLastError := True)> _ Shared Function PostMessage(hWnd As IntPtr, Msg As UInteger, wParam As IntPtr, lParam As IntPtr) As<MarshalAs(UnmanagedType.Bool)> Boolean Public Overloads Shared Sub Main() Main(System.Environment.GetCommandLineArgs()) End Sub <STAThread()> _ Overloads Shared Sub Main(args() As String) Dim processName As String ' Find process. Dim p As Process() = Process.GetProcessesByName(args(0)) If p.Length > 0 Then For Each proc As Process In p ' Check if main window exists. If the window is minimized to the tray this might be not the case. If proc.MainWindowHandle = IntPtr.Zero Then ' Try closing application by sending WM_CLOSE to all child windows in all threads. For Each pt As ProcessThread In proc.Threads EnumThreadWindows(CUInt(pt.Id), New EnumThreadDelegate(ExitApp.EnumThreadCallback), IntPtr.Zero) Next pt Else ' Try to close main window. If proc.CloseMainWindow() Then ' Free resources used by this Process object. proc.Close() End If End If Next proc End If End Sub Shared Function EnumThreadCallback(hWnd As IntPtr, lParam As IntPtr) As Boolean ' Close the enumerated window. PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero) Return True End Function End Class
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