Finding child windows in c#

If you have a IntPtr window handle (e.g. by using Process.MainWindow), the following helper functions lets you find any of its child windows by class name and/or window title, recursively:

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/// <summary> /// Uses FindWindowEx() to recursively search for a child window with the given class and/or title. /// </summary> public static IntPtr FindChildWindow( IntPtr hwndParent, string lpszClass, string lpszTitle ) {  return FindChildWindow( hwndParent, IntPtr.Zero, lpszClass, lpszTitle ); }     [DllImport("user32.dll", SetLastError = true)] public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);   /// <summary> /// Uses FindWindowEx() to recursively search for a child window with the given class and/or title. /// </summary> public static IntPtr FindChildWindow( IntPtr hwndParent, string lpszClass, string lpszTitle ) {  return FindChildWindow( hwndParent, IntPtr.Zero, lpszClass, lpszTitle ); }   /// <summary> /// Uses FindWindowEx() to recursively search for a child window with the given class and/or title, /// starting after a specified child window. /// If lpszClass is null, it will match any class name. It's not case-sensitive. /// If lpszTitle is null, it will match any window title. /// </summary> public static IntPtr FindChildWindow( IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszTitle ) {  // Try to find a match.  IntPtr hwnd = FindWindowEx( hwndParent, IntPtr.Zero, lpszClass, lpszTitle );  if ( hwnd == IntPtr.Zero )  {   // Search inside the children.   IntPtr hwndChild = FindWindowEx( hwndParent, IntPtr.Zero, null, null );   while ( hwndChild != IntPtr.Zero && hwnd == IntPtr.Zero )   {    hwnd = FindChildWindow( hwndChild, IntPtr.Zero, lpszClass, lpszTitle );    if ( hwnd == IntPtr.Zero )    {     // If we didn't find it yet, check the next child.     hwndChild = FindWindowEx( hwndParent, hwndChild, null, null );    }   }  }  return hwnd; }