方法一: 
char *p; 
CString str="hello"; 
p=str.GetBuffer(str.GetLength()); 
str.ReleaseBuffer(); 
方法二: 
CString str="hello"; 
char ch[20]; 
memcpy(ch,str,str.GetLength()); 
方法三: 
char *ch; 
CString str="hello"; 
ch=(LPSTR)(LPCTSTR)str;