C# 根據座標擷取控制代碼

//擷取視窗標題[DllImport("user32", SetLastError = true)]public static extern int GetWindowText(    IntPtr hWnd,//視窗控制代碼    StringBuilder lpString,//標題    int nMaxCount //最大值    );//擷取類的名字[DllImport("user32.dll")]private static extern int GetClassName(    IntPtr hWnd,//控制代碼    StringBuilder lpString, //類名    int nMaxCount //最大值    );//根據座標擷取視窗控制代碼[DllImport("user32")]private static extern IntPtr WindowFromPoint(Point Point  //座標);private void timer1_Tick(object sender, EventArgs e){    int x = Cursor.Position.X;    int y = Cursor.Position.Y;    Point p = new Point(x, y);    IntPtr formHandle = WindowFromPoint(p);//得到視窗控制代碼    StringBuilder title = new StringBuilder(256);    GetWindowText(formHandle, title, title.Capacity);//得到視窗的標題    StringBuilder className = new StringBuilder(256);    GetClassName(formHandle, className, className.Capacity);//得到視窗的控制代碼    this.textBox1.Text = title.ToString();    this.textBox2.Text = formHandle.ToString();    this.textBox3.Text = className.ToString();}