#include <sstream>
#include <locale>
#include <codecvt>
#include "boost/property_tree/ini_parser.hpp"

void HandleIniUTF16()
{
    std::wstring szFile = L"Chinese(Simplified).txt";
    std::locale old = std::locale::global(std::locale(""));
 
    try
    {
        FILE* fp = _wfopen(szFile.c_str(), L"r, ccs=UTF-16LE");
        std::wstringstream wss;
 
        wchar_t str[1024] = {0};
        while (fgetws(str, 1024, fp) != NULL)
        {
 
            wss << str;
        }
 
        fclose(fp);
        boost::property_tree::wptree pt;
        boost::property_tree::read_ini(wss, pt);
        boost::optional<std::wstring> strVal = pt.get_optional<std::wstring>(L"Person.Name");
        std::wstring ret = strVal.get_value_or(std::wstring(L"no value"));
        pt.put(L"Person.Name", L"elvis");
        write_ini_ex(wss, pt);
  　　　fp = _wfopen(szFile.c_str(), L"wt, ccs=UTF-16LE");
　　　　fputws(wss.str().c_str(), fp);
　　　  fclose(fp);
    }
    catch (boost::property_tree::ini_parser_error& ex)
    {
        AfxMessageBox(ex.what());
    }catch (std::exception& ex)
    {
        AfxMessageBox(ex.what());
    }
 
    std::locale::global(old);
}

static void write_ini_ex(std::wstringstream& wss, const boost::property_tree::wptree& pt)
{
	wss.str(L""); wss.clear();
 
	for (BOOST_AUTO(pos,pt.begin()); pos!=pt.end(); ++pos)
	{
		std::wstring szSec = pos->first;
		wss << L'[' << szSec << L']' << L"
";
		if (!pos->second.empty())
		{
			for (BOOST_AUTO(it,pos->second.begin()); it!=pos->second.end(); ++it)
			{
				std::wstring szKey = it->first;
				wss << szKey << L'=' ;
				std::wstring szVal = it->second.data();
				if (!szVal.empty())
				{
					wss << szVal;
				}
 
				wss << L"
";
			}
		}
 
		wss << L"
";
	}
}

代码使用
读取UTF-16 LE

{
	std::wstring wstrCraftIniFile = CSystemTool::GetCraftFile();

	try {
		FILE* fp = _wfopen(wstrCraftIniFile.c_str(), L"r, ccs=UTF-16LE");
		std::wstringstream wss;

		wchar_t str[1024] = { 0 };
		while (fgetws(str, 1024, fp) != NULL)
		{

			wss << str;
		}

		fclose(fp);

		
		boost::property_tree::wptree pt;
		boost::property_tree::read_ini(wss, pt);

		for (int i = 0; i < MAX_WORKSTATION_CNT; ++i)
		{
			std::wstringstream ss;
			std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
			wstring key = converter.from_bytes(GetWorkNameKey());
			ss << key << L"."<< i;

			boost::optional<std::wstring> strVal = pt.get_optional<std::wstring>(ss.str());
			std::wstring strName = strVal.get_value_or(std::wstring(L""));
			m_vecWorkNames.push_back(strName);
		}
	}
	catch (std::exception e)
	{
		string err = e.what();
		cout << err;
	}
}

读取ANSI

try {
		boost::filesystem::path file(wstrCraftIniFile);
		boost::property_tree::ptree pt;
		boost::property_tree::ini_parser::read_ini(file.string(), pt);

		for (int i = 0; i < MAX_WORKSTATION_CNT; ++i)
		{
			std::stringstream ss;
			ss << GetWorkNameKey() << "."<< i;

			std::string strName = pt.get<std::string>(ss.str(), "");
			m_vecWorkNames.push_back(CStringHelper::mbs2wchar(strName));
		}
	}
	catch (std::exception e)
	{
		string err = e.what();
		cout << err;
	}