Windows的字符串

LPSTR和LPWSTR的定义:
typedef char* PSTR, *LPSTR; 
typedef wchar_t* LPWSTR;

LPTSTR的定义:
#ifdef UNICODE
    typedef LPWSTR LPTSTR;
    typedef LPCWSTR LPCTSTR;
#else
    typedef LPSTR LPTSTR;
    typedef LPCSTR LPCTSTR;
#endif