한글 wstring을 string으로 변환

#include <QtCore/QCoreApplication>
#include <iostream>
#include <string>
#include <locale>
#include <cstdlib>
#include <QDebug>
 
 
#ifdef WIN32
  #pragma warning(disable:4786)
#endif
#include <iostream>
using namespace std;
 
void string2wstring(wstring &dest,const string &src)
{
     dest.resize(src.size());
     for ( unsigned int  i=0; i<src.size(); i++)
        dest[i] = static_cast<unsigned char>(src[i]);
}
 
void wstring2string(string &dest,const wstring &src)
{
     dest.resize(src.size());
     for (unsigned int i=0; i<src.size(); i++)
         dest[i] = src[i] < 256 ? src[i] : ' ';
}
 
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    //한글 wstring을 string으로 변환'하기를 검색하면 이렇게 나오는데. 첫번째것이 되는거? 같습니다.
    //http://blog.naver.com/ratmsma/40034898566
    //http://blog.naver.com/pjy3124/120050002754
    //http://cafe.naver.com/newchany/625
 
    int i = 0;
    const unsigned char *ctemp;
    string str = "한글 English";
    wstring wstr;
 
    string2wstring( wstr, str );
    wstring2string ( str, wstr );
    printf("str size %d\n", (int)str.size());
 
    // string을 char로 변환
    ctemp = (const unsigned char *)str.c_str();
 
    for (i = 0; i < str.size(); i++)
    {
            printf("%c", ctemp[i]);  // "ㄱ" 출력
    }
    printf("\n");
 
    for (i = 0; i < str.size(); i++)
    {
            printf("%d\n", ctemp[i]);  // "ㄱ" 을 int로 출력
    }
 
 
    //http://www.freebsdchina.org/forum/viewtopic.php?t=34539
    wchar_t *wc;
    wchar_t *ws = (wchar_t*)"中文/Chinese";
 
     /*
    if(setlocale(LC_ALL, "zh_CN.UTF-8") == NULL){
      perror("set local failed");
      return 1;
    }*/
    setlocale(LC_ALL, "");
    wprintf(L"%ls\n\n", ws);
 
    for(wc = ws; *wc != 0; ++wc){
      wprintf(L"%lc\n", *wc);
    }
 
    //http://neptjuno.tistory.com/42
    //-finput-charset=charset 은 안되더군요. ㅇ_ㅇ;;
 
    return a.exec();
}