用多字节编码的话可以试试这个

char temp[4];
CString str = _T("23"); 
char* pchar = str.GetBuffer(0); 
strcpy(temp,pchar);

如果是unicode编码的话,用这个

char temp[4]; 
CString str = _T("23"); 
USES_CONVERSION; char* pchar = _T(""); 
pchar = W2A(str); 
strcpy(temp,pchar);