CString 변환 : char (Multibyte) , wchar_t (Unicode)

  CString str(_T("ABCDEFG"));

#ifdef _UNICODE

  wchar_t * t = str.GetBuffer(str.GetLength());

  // wchar_t to char
  int size = WideCharToMultiByte(CP_ACP, 0, t, -1, NULL, 0, NULL, NULL);
  char * s = new char[size];
  WideCharToMultiByte(CP_ACP, 0, t, -1, s, size, 0, 0); 

#else // Multibyte

  char * s = str.GetBuffer(0);

#endif

 ...

#ifdef _UNICODE

  delete [] s;

#endif

  str.ReleaseBuffer();