Window Handle Info

WindowHandleInfo.cs

public class WindowHandleInfo
{
    private delegate bool EnumWindowProc(IntPtr hwnd, IntPtr lParam);
 
    [DllImport("user32")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool EnumChildWindows(IntPtr window, EnumWindowProc callback, IntPtr lParam);
 
    private IntPtr _MainHandle;
 
    public WindowHandleInfo(IntPtr handle)
    {
        this._MainHandle = handle;
    }
 
    public List<IntPtr> GetAllChildHandles()
    {
        List<IntPtr> childHandles = new List<IntPtr>();
 
        GCHandle gcChildhandlesList = GCHandle.Alloc(childHandles);
        IntPtr pointerChildHandlesList = GCHandle.ToIntPtr(gcChildhandlesList);
 
        try
        {
            EnumWindowProc childProc = new EnumWindowProc(EnumWindow);
            EnumChildWindows(this._MainHandle, childProc, pointerChildHandlesList);
        }
        finally
        {
            gcChildhandlesList.Free();
        }
 
        return childHandles;
    }
 
    private bool EnumWindow(IntPtr hWnd, IntPtr lParam)
    {
        GCHandle gcChildhandlesList = GCHandle.FromIntPtr(lParam);
 
        if (gcChildhandlesList == null || gcChildhandlesList.Target == null)
        {
            return false;
        }
 
        List<IntPtr> childHandles = gcChildhandlesList.Target as List<IntPtr>;
        childHandles.Add(hWnd);
 
        return true;
    }
}