先立个帖, 慢慢记录.
wstring --> string:
wstring ws = L"hello";
string s(ws.begin(), ws.end());
//上面的构造函数等价于assign函数, 其实就是string s; s.assign(ws.begin(), ws.end());
char c[] = "hello";
cout << strcmp(s.c_str(), c) << endl; //输出0
string --> wstring:
string s = "hello world!";
wstring ws;
ws.assign(s.begin(), s.end());
//同理, 可以直接用构造函数
wstring ws2 = L"hello world!";
cout << (ws == ws2) << endl; //输出1