使用c++11标准库转换字符编码

转载自：http://blog.csdn.net/wangji163163/article/details/8757212

#include <stdio.h>#include <locale>#include <codecvt>const std::string ws2s( const std::wstring& src ){std::locale sys_locale("");const wchar_t* data_from = src.c_str();const wchar_t* data_from_end = src.c_str() + src.size();const wchar_t* data_from_next = 0;int wchar_size = 4;char* data_to = new char[(src.size() + 1) * wchar_size];char* data_to_end = data_to + (src.size() + 1) * wchar_size;char* data_to_next = 0;memset( data_to, 0, (src.size() + 1) * wchar_size );typedef std::codecvt<wchar_t, char, mbstate_t> convert_facet;mbstate_t out_state = 0;auto result = std::use_facet<convert_facet>(sys_locale).out(out_state, data_from, data_from_end, data_from_next,data_to, data_to_end, data_to_next );if( result == convert_facet::ok ){std::string dst = data_to;delete[] data_to;return dst;}else{printf( "convert error!\n" );delete[] data_to;return std::string("");}}const std::wstring s2ws( const std::string& src ){std::locale sys_locale("");const char* data_from = src.c_str();const char* data_from_end = src.c_str() + src.size();const char* data_from_next = 0;wchar_t* data_to = new wchar_t[src.size() + 1];wchar_t* data_to_end = data_to + src.size() + 1;wchar_t* data_to_next = 0;wmemset( data_to, 0, src.size() + 1 );typedef std::codecvt<wchar_t, char, mbstate_t> convert_facet;mbstate_t in_state = 0;auto result = std::use_facet<convert_facet>(sys_locale).in(in_state, data_from, data_from_end, data_from_next,data_to, data_to_end, data_to_next );if( result == convert_facet::ok ){std::wstring dst = data_to;delete[] data_to;return dst;}else{printf( "convert error!\n" );delete[] data_to;return std::wstring(L"");}}const std::string ws2utf8( const std::wstring& src ){std::wstring_convert<std::codecvt_utf8<wchar_t>> conv;return conv.to_bytes( src );}const std::wstring utf8_2_ws( const std::string& src ){std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;return conv.from_bytes( src );}

http://it.cppreference.com/w/cpp/locale/wstring_convert
Vedi anche
Character conversionsnarrow multibyte (char)UTF-8 (char)UTF-16 (char16_t)UTF-16mbrtoc16 / c16rtombcodecvt<char16_t, char, mbstate_t> codecvt_utf8_utf16<char16_t> codecvt_utf8_utf16<char32_t> codecvt_utf8_utf16<wchar_t>N/AUCS2Nocodecvt_utf8<char16_t>codecvt_utf16<char16_t>UTF-32/UCS4 (char32_t)mbrtoc32 / c32rtombcodecvt<char32_t, char, mbstate_t> codecvt_utf8<char32_t>codecvt_utf16<char32_t>UCS2/UCS4 (wchar_t)Nocodecvt_utf8<wchar_t>codecvt_utf16<wchar_t>wide (wchar_t)codecvt<wchar_t, char, mbstate_t> mbsrtowcs / wcsrtombsNoNo

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发现了个更简单的代码

const std::string unicode2gbk(const std::wstring& src){std::wstring_convert<std::codecvt<wchar_t, char, std::mbstate_t>>cvt_ansi(new std::codecvt<wchar_t, char, std::mbstate_t>("CHS"));return cvt_ansi.to_bytes(src); }const std::wstring gbk2unicode(const std::string& src){std::wstring_convert<std::codecvt<wchar_t, char, std::mbstate_t>>cvt_ansi(new std::codecvt<wchar_t, char, std::mbstate_t>("CHS"));return cvt_ansi.from_bytes(src);}const std::string ws2utf8(const std::wstring& src){std::wstring_convert<std::codecvt_utf8<wchar_t>> conv;return conv.to_bytes(src);}const std::wstring utf8_2_ws(const std::string& src){std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;return conv.from_bytes(src);}