使用c++11標準庫轉換字元編碼

#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 conversions	narrow multibyte (char)	UTF-8 (char)	UTF-16 (char16_t)
UTF-16	mbrtoc16 / c16rtomb	codecvt<char16_t, char, mbstate_t> codecvt_utf8_utf16<char16_t> codecvt_utf8_utf16<char32_t> codecvt_utf8_utf16<wchar_t>	N/A
UCS2	No	codecvt_utf8<char16_t>	codecvt_utf16<char16_t>
UTF-32/UCS4 (char32_t)	mbrtoc32 / c32rtomb	codecvt<char32_t, char, mbstate_t> codecvt_utf8<char32_t>	codecvt_utf16<char32_t>
UCS2/UCS4 (wchar_t)	No	codecvt_utf8<wchar_t>	codecvt_utf16<wchar_t>
wide (wchar_t)	codecvt<wchar_t, char, mbstate_t> mbsrtowcs / wcsrtombs	No	No