窄字节宽字节的互转(string--wstring)

#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
using namespace std;
int main()
{
  std::wstring str = L"123,宋体！";
  std::wstring_convert<std::codecvt_utf8<wchar_t>> conv;
  std::string narrowStr = conv.to_bytes(str);
  std::wstring wideStr = conv.from_bytes(narrowStr);
  while (1);
  return 0;
}

std::string ws2s(const std::wstring& str)
{
  int tm1 = GetCurTime();
  char*     pElementText;
  int    iTextLen;
  // wide char to multi char
  iTextLen = WideCharToMultiByte(CP_ACP, 0, str.c_str(), -1, NULL, 0, NULL, NULL);
  pElementText = new char[iTextLen + 1];
  memset((void*)pElementText, 0, sizeof(char)* (iTextLen + 1));
  ::WideCharToMultiByte(CP_ACP, 0, str.c_str(), -1, pElementText, iTextLen, NULL, NULL);
  std::string strText;
  strText = pElementText;
  delete[] pElementText;
  int tm2 = GetCurTime() - tm1;
  return strText;
}