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Summary

The GetGUIThreadInfo API

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static extern bool GetGUIThreadInfo(uint idThread, ref GUITHREADINFO lpgui);

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    public struct GUITHREADINFO

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GUITHREADINFO threadInfo = new GUITHREADINFO();

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GetGUIThreadInfo( 0, out threadInfo );

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    public static extern bool GetGUIThreadInfo(uint idThread, ref GUITHREADINFO lpgui);

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    public struct GUITHREADINFO

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        Win32API.GUITHREADINFO guiThreadInfo = new Win32API.GUITHREADINFO();

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        guiThreadInfo.cbSize = Marshal.SizeOf(guiThreadInfo);

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        Win32API.GetGUIThreadInfo(dwThreadId, ref guiThreadInfo);

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        hWnd = guiThreadInfo.hwndActive;

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    // Thanks to this StackOverflow question: http://stackoverflow.com/questions/719825/calling-getguithreadinfo-via-p-invoke

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    internal struct GuiThreadInfo

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        internal static extern bool GetGUIThreadInfo(uint idThread, ref GuiThreadInfo lpgui);

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        var info = new GuiThreadInfo();

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        if(!GetGUIThreadInfo(0, ref info))

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Documentation

[GetGUIThreadInfo] on MSDN

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The GUITHREADINFO structure contains information about a graphical user interface (GUI) thread. For example you can get the caret (blinking cursor in textfields) position

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public struct GUITHREADINFO

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Structure GUITHREADINFO

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Documentation

[GUITHREADINFO] on MSDN