@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The GetGUIThreadInfo API !!!!C# Signature: [DllImport("user32.dll")] static extern bool GetGUIThreadInfo(uint idThread, ref GUITHREADINFO lpgui); [Flags] public enum GuiThreadInfoFlags { GUI_CARETBLINKING = 0x00000001, GUI_INMENUMODE = 0x00000004, GUI_INMOVESIZE = 0x00000002, GUI_POPUPMENUMODE = 0x00000010, GUI_SYSTEMMENUMODE = 0x00000008 } [StructLayout(LayoutKind.Sequential)] public struct GUITHREADINFO { public int cbSize; public GuiThreadInfoFlags flags; public IntPtr hwndActive; public IntPtr hwndFocus; public IntPtr hwndCapture; public IntPtr hwndMenuOwner; public IntPtr hwndMoveSize; public IntPtr hwndCaret; public System.Drawing.Rectangle rcCaret; } !!!!User-Defined Types: None. !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: GUITHREADINFO threadInfo = new GUITHREADINFO(); threadInfo.cbSize = Marshal.SizeOf( threadInfo ); GetGUIThreadInfo( 0, ref threadInfo ); !!!!Sample Code: // Get WIndow Handle From Thread ID [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool GetGUIThreadInfo(uint idThread, ref GUITHREADINFO lpgui); public struct GUITHREADINFO { public int cbSize; public int flags; public IntPtr hwndActive; public IntPtr hwndFocus; public IntPtr hwndCapture; public IntPtr hwndMenuOwner; public IntPtr hwndMoveSize; public IntPtr hwndCaret; public System.Drawing.Rectangle rcCaret; } public int getThreadWindowHandle( uint dwThreadId ) { int hWnd = 0; // Get Window Handle and title from Thread Win32API.GUITHREADINFO guiThreadInfo = new Win32API.GUITHREADINFO(); guiThreadInfo.cbSize = Marshal.SizeOf(guiThreadInfo); Win32API.GetGUIThreadInfo(dwThreadId, ref guiThreadInfo); hWnd = guiThreadInfo.hwndActive; return hWnd; } !!!!Sample Program: // THis program will retrieve the window handle for the current foreground window. // Tested on Win7 64 bit. // Thanks to this StackOverflow question: http://stackoverflow.com/questions/719825/calling-getguithreadinfo-via-p-invoke using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.ComponentModel; using System.Threading; namespace GUIThread { [StructLayout(LayoutKind.Sequential)] internal struct Rect { public int Left; public int Top; public int Right; public int Bottom; } [StructLayout(LayoutKind.Sequential)] internal struct GuiThreadInfo { public int cbSize; public uint flags; public IntPtr hwndActive; public IntPtr hwndFocus; public IntPtr hwndCapture; public IntPtr hwndMenuOwner; public IntPtr hwndMoveSize; public IntPtr hwndCaret; public Rect rcCaret; } class Program { [DllImport("user32.dll", SetLastError = true)] internal static extern bool GetGUIThreadInfo(uint idThread, ref GuiThreadInfo lpgui); static IntPtr GetFocusedHandle() { var info = new GuiThreadInfo(); info.cbSize = Marshal.SizeOf(info); if(!GetGUIThreadInfo(0, ref info)) throw new Win32Exception(); return info.hwndFocus; } static void Main(string[] args) { for(; ; ) { Console.WriteLine("Currently Focused Window: {0}", GetFocusedHandle()); Thread.Sleep(1000); } } } } !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: GetGUIThreadInfo@msdn on MSDN
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