C#调用Windows(8/10)自带的虚拟键盘

注：这是电子屏（触屏）的键盘，普通PC没有这种键盘的；

以下是调用代码：

private const Int32 WM_SYSCOMMAND = 274;
private const UInt32 SC_CLOSE = 61536;
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool PostMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int RegisterWindowMessage(string lpString);
  
 //显示屏幕键盘
public static int ShowInputPanel()
{
      try
      {
            dynamic file = "C:\\Program Files\\Common Files\\microsoft shared\\ink\\TabTip.exe";
            if (!System.IO.File.Exists(file))
                return -1;
            Process.Start(file);
            //return SetUnDock(); //不知SetUnDock()是什么，所以直接注释返回1
            return 1;
      }
      catch (Exception)
      {
            return 255;
      }
}
 
//隐藏屏幕键盘
public static void HideInputPanel(){
      IntPtr TouchhWnd = new IntPtr(0);
      TouchhWnd = FindWindow("IPTip_Main_Window", null);
      if (TouchhWnd == IntPtr.Zero)
            return;
      PostMessage(TouchhWnd, WM_SYSCOMMAND, SC_CLOSE, 0);
}