C++ UFT-8和GB2312间的转换

#include <codecvt>

#include <locale>

#include <vector>

using namespace std;

std::string gb2312_to_utf8(std::string const &strGb2312)

{

    std::vector<wchar_t> buff(strGb2312.size());

#ifdef _MSC_VER

    std::locale loc("zh-CN");

#else

    std::locale loc("zh_CN.GB18030");

#endif

    wchar_t* pwszNext = nullptr;

    const char* pszNext = nullptr;

    mbstate_t state = {};

    int res = std::use_facet<std::codecvt<wchar_t, char, mbstate_t> >

        (loc).in(state,

            strGb2312.data(), strGb2312.data() + strGb2312.size(), pszNext,

            buff.data(), buff.data() + buff.size(), pwszNext);

    if (std::codecvt_base::ok == res)

    {

        std::wstring_convert<std::codecvt_utf8<wchar_t>> cutf8;

        return cutf8.to_bytes(std::wstring(buff.data(), pwszNext));

    }

    return "";

}

std::string utf8_to_gb2312(std::string const &strUtf8)

{

    std::wstring_convert<std::codecvt_utf8<wchar_t>> cutf8;

    std::wstring wTemp = cutf8.from_bytes(strUtf8);

#ifdef _MSC_VER

    std::locale loc("zh-CN");

#else

    std::locale loc("zh_CN.GB18030");

#endif

    const wchar_t* pwszNext = nullptr;

    char* pszNext = nullptr;

    mbstate_t state = {};

    std::vector<char> buff(wTemp.size() * );

    int res = std::use_facet<std::codecvt<wchar_t, char, mbstate_t> >

        (loc).out(state,

            wTemp.data(), wTemp.data() + wTemp.size(), pwszNext,

            buff.data(), buff.data() + buff.size(), pszNext);

    if (std::codecvt_base::ok == res)

    {

        return std::string(buff.data(), pszNext);

    }

    return "";

}