求助！帮忙看看！

[a6523771]

我写的是MFC的消息函数，我想实现的是像记事本那样。在任意处输入字符串，还有退格和换行的功能。但是不能输入字符。为什么呢？帮忙看看，谢谢~
int CMFCTEXTView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;

//创建文本插入符
CClientDC dc(this);
TEXTMETRIC tm;
dc.GetTextMetrics(&tm);
CreateSolidCaret(tm.tmAveCharWidth/8, tm.tmHeight); /
ShowCaret();
return 0;
}

void CMFCTEXTView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值

CClientDC dc(this);
TEXTMETRIC tm;
dc.GetTextMetrics (&tm);
if (0x0d == nChar)
{
m_strLine.Empty();
m_ptOrigin.y += tm.tmHeight;
}
else if (0x08 == nChar)
{
COLORREF clr = dc.SetTextColor (dc.GetBkColor());
dc.TextOut (m_ptOrigin.x, m_ptOrigin.y, m_strLine);
m_strLine = m_strLine.Left(m_strLine.GetLength() - 1);
dc.SetTextColor (clr);
}
dc.TextOut (m_ptOrigin.x, m_ptOrigin.y, m_strLine);

CView::OnChar(nChar, nRepCnt, nFlags);
}
void CMFCTEXTView::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值

SetCaretPos (point);
m_strLine.Empty();
m_ptOrigin = point;

CView::OnLButtonDown(nFlags, point);
}