C#如何获取reachtextbox光标的屏幕坐标

       #region 得到光标在屏幕上的位置

        [DllImport("user32")]

         public static extern bool GetCaretPos(out Point lpPoint);

         [DllImport("user32dll")]

         private static extern IntPtr GetForegroundWindow();

         [DllImport("user32dll")]

         private static extern IntPtr GetFocus();

         [DllImport("user32dll")]

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

         [DllImport("user32dll")]

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

         [DllImport("kernel32dll")]

         private static extern IntPtr GetCurrentThreadId();

         [DllImport("user32dll")]

         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 (ptrToInt32() != 0)

             {

                 IntPtr targetThreadID = GetWindowThreadProcessId(ptr, IntPtrZero);

                 IntPtr localThreadID = GetCurrentThreadId();

                 if (localThreadID != targetThreadID)

                 {

                     AttachThreadInput(localThreadID, targetThreadID, 1);

                     ptr = GetFocus();

                     if (ptrToInt32() != 0)

                     {

                         GetCaretPos(out   p);

                         ClientToScreen(ptr, ref   p);

                     }

                     AttachThreadInput(localThreadID, targetThreadID, 0);

                 }

             }

             return p;

         }

         #endregion

private void AddTabitem(string filePath, mode fileMode)

{

if (fileMode == modeopenFile)

{

if (FileExists(filePath))

{

RichTextBox mcRTB = new RichTextBox();

mcRTBKeyDown += new KeyEventHandler(LineNumber);

//rest of the code goes here

}

}

}

mcRTBKeyDown += new KeyEventHandler(LineNumber);

private void LineNumber(object sender, KeyEventArgs e)

{

TextPointer tp1 = rtbList[EditorTabcontrolSelectedIndex]SelectionStartGetLineStartPosition(0);

TextPointer tp2 = rtbList[EditorTabcontrolSelectedIndex]SelectionStart;

int column = tp1GetOffsetToPosition(tp2);

int someBigNumber = intMaxValue;

int lineMoved, currentLineNumber;

rtbList[EditorTabcontrolSelectedIndex]SelectionStartGetLineStartPosition(-someBigNumber, out lineMoved);

currentLineNumber = -lineMoved;

string LineColumnLabel;

//LineColumnLabelContent ="Line:" + currentLineNumberToString() +" Column:" + columnToString();

LineColumnLabel ="Line:" + currentLineNumberToString() +" Column:" + columnToString();

}

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