参考文档

http://msdn.microsoft.com/en-us/library/ms533909

http://louis.steelbytes.com/DrawTextBug.html

http://msdn.microsoft.com/en-us/library/dd162498 

 OnPaint()函数里

CPaintDC dc(this); 
WCHAR  *szBuffer; 
CString m_strCaption= _T("test");
szBuffer=new WCHAR[m_strCaption.GetLength()+10]; 
wcscpy(szBuffer,m_strCaption); 
 CRect rectTest;
 dc.DrawText(szBuffer,-1,&rectTest,DT_CALCRECT);