光标跟随

       #region 得到光标在屏幕上的位置

 

        [DllImport("user32")]

 

         public static extern bool GetCaretPos(out Point lpPoint);

 

         [DllImport("user32.dll")]

 

         private static extern IntPtr GetForegroundWindow();

 

         [DllImport("user32.dll")]

 

         private static extern IntPtr GetFocus();

 

         [DllImport("user32.dll")]

 

         private static extern IntPtr AttachThreadInput(IntPtr idAttach, IntPtr idAttachTo, int fAttach);

 

         [DllImport("user32.dll")]

 

         private static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId);

 

         [DllImport("kernel32.dll")]

 

         private static extern IntPtr GetCurrentThreadId();

 

         [DllImport("user32.dll")]

 

         private static extern void ClientToScreen(IntPtr hWnd, ref Point p);

 

 

         private Point CaretPos()

 

         {

 

             IntPtr ptr = GetForegroundWindow();

 

             Point p = new Point();

 

 

             //得到Caret在屏幕上的位置   

 

             if (ptr.ToInt32() != 0)

 

             {

 

                 IntPtr targetThreadID = GetWindowThreadProcessId(ptr, IntPtr.Zero);

 

                 IntPtr localThreadID = GetCurrentThreadId();

 

 

                 if (localThreadID != targetThreadID)

 

                 {

 

                     AttachThreadInput(localThreadID, targetThreadID, 1);

 

                     ptr = GetFocus();

 

                     if (ptr.ToInt32() != 0)

 

                     {

 

                         GetCaretPos(out   p);

 

                         ClientToScreen(ptr, ref   p);

 

                     }

 

                     AttachThreadInput(localThreadID, targetThreadID, 0);

 

                 }

 

             }

 

             return p;

 

         }

 

         #endregion