Search
Module:
Directory

   Desktop Functions:

   Smart Device Functions:


Show Recent Changes
Subscribe (RSS)
Misc. Pages
Comments
FAQ
Helpful Tools
Playground
Suggested Reading
Website TODO List
Download Visual Studio Add-In

GetGUIThreadInfo (user32)
 
.
Summary

C# Signature:

[DllImport("user32.dll")]
static extern bool GetGUIThreadInfo(uint idThread, out GUITHREADINFO lpgui);

    public struct GUITHREADINFO
    {
        public int cbSize;
        public int flags;
        public int hwndActive;
        public int hwndFocus;
        public int hwndCapture;
        public int hwndMenuOwner;
        public int hwndMoveSize;
        public int 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, out 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 int hwndActive;
        public int hwndFocus;
        public int hwndCapture;
        public int hwndMenuOwner;
        public int hwndMoveSize;
        public int 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;
    }

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

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).

 
Access PInvoke.net directly from VS:
Terms of Use
Find References
Show Printable Version
Revisions