c++11 编码转换

#include <codecvt>
#include <locale>

 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() * 2);
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 "";
}

 

////////////////////////////////////////////////////////////////////////////////

// convert string to wstring
inline std::wstring to_wide_string(const std::string& input)
{
std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
return converter.from_bytes(input);
}

// convert wstring to string
inline std::string to_byte_string(const std::wstring& input)
{
//std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
return converter.to_bytes(input);
}

inline std::string utf8_to_gbk(const std::string& str)
{
std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;
std::wstring tmp_wstr = conv.from_bytes(str);
//GBK locale name in windows
const char* GBK_LOCALE_NAME = ".936";
std::wstring_convert<std::codecvt_byname<wchar_t, char, mbstate_t>> convert(new std::codecvt_byname<wchar_t, char, mbstate_t>(GBK_LOCALE_NAME));
return convert.to_bytes(tmp_wstr);
}

inline std::string gbk_to_utf8(const std::string& str)
{
//GBK locale name in windows
const char* GBK_LOCALE_NAME = ".936";
std::wstring_convert<std::codecvt_byname<wchar_t, char, mbstate_t>> convert(new std::codecvt_byname<wchar_t, char, mbstate_t>(GBK_LOCALE_NAME));
std::wstring tmp_wstr = convert.from_bytes(str);
std::wstring_convert<std::codecvt_utf8<wchar_t>> cv2;
return cv2.to_bytes(tmp_wstr);
}

inline std::wstring gbk_to_wstr(const std::string& str)
{
//GBK locale name in windows
const char* GBK_LOCALE_NAME = ".936";
std::wstring_convert<std::codecvt_byname<wchar_t, char, mbstate_t>> convert(new std::codecvt_byname<wchar_t, char, mbstate_t>(GBK_LOCALE_NAME));
return convert.from_bytes(str);
}