MFC里 CString 转char*

程序里用到CString转char * ,CString里有中文, 找了很久试了才找到这个方法，特地记录下来：

char * buf =  "Hello" ;
CString str(buf);
AfxMessageBox(str);

#include <altbase.h>
CString strText(_T( "Hello" ));
USES_CONVERSION;
char * buf = T2A(strText);