#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 );}
遇到0X2C 0XA0的UTF8字符编码进行特殊处理，转换成普通空格。