CString str;
str = _T("hello world!")
USES_CONVERSION; //定义后才能使用T2A
char buff[1024];

sprintf_s(buff,1024,"%s\r\n",T2A(str));

WCHAR wch[1000];
int n = MultiByteToWideChar( //转换Unicode到Ansi 
936, 
0, 
buff, 
-1, 
wch, //转换到缓冲区中 
100000 //最多个字节 
);
CString str;
str = wch;