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方式一：

#include <string>
#include <locale>
#include <codecvt>

//unicode转中文 （\u4f60\u597d\u554a   ==》  你好啊）
string unicodeToCHI(string &unicodeStr){
	string uStr, value;
	int index, len;
	wstring_convert<codecvt_utf8<char32_t>, char32_t> converter;
	
	if (unicodeStr.length() <= 0)
	{
		return "";
	}

	//unicode转utf8
	while (1){
		index = unicodeStr.find("\\u");
		if (index<0 || index>unicodeStr.length())
			break;

		//转换需要的地方
		uStr = unicodeStr.substr(index + 2, 4);
		for (size_t i = 0; i < uStr.length();){
			char32_t uhan = strtol(uStr.substr(i, 4).c_str(), nullptr, 16);
			value = converter.to_bytes(uhan);
			i += 4;
		}

		//在原字符串中替换掉
		unicodeStr.replace(index, 6, value);
	}


	//utf8转ANSI
	len = ::MultiByteToWideChar(CP_UTF8, 0, unicodeStr.c_str(), -1, NULL, 0);
	WCHAR* wStr = new WCHAR[len + 1];
	memset(wStr, 0, sizeof(wStr));
	len = MultiByteToWideChar(CP_UTF8, 0, unicodeStr.c_str(), -1, wStr, len);

	len = WideCharToMultiByte(CP_ACP, 0, wStr, -1, NULL, 0, NULL, NULL);
	char *szANSI = new char[len + 1];
	memset(szANSI, 0, sizeof(szANSI));
	WideCharToMultiByte(CP_ACP, 0, wStr, -1, szANSI, len, NULL, NULL);


	unicodeStr = szANSI;


	delete[]wStr;
	wStr = NULL;

	return unicodeStr;
}

方式二：

#include <atlstr.h>


string unicodeToCHI2(string &unicodeStr)
{
	int index;
	CString cstr;
	int nValue = 0;
	WCHAR * pWchar;
	wchar_t* szHex;
	char strchar[6] = { '0', 'x', '\0' };

	if (unicodeStr.length() <= 0)
	{
		return "";
	}

	while (1){
		int index = unicodeStr.find("\\u");
		if (index <0 || index>unicodeStr.length())
			break;

		strchar[2] = unicodeStr[index+2];
		strchar[3] = unicodeStr[index + 3];
		strchar[4] = unicodeStr[index + 4];
		strchar[5] = unicodeStr[index + 5];

		USES_CONVERSION;
		szHex = A2W(strchar);

		StrToIntExW(szHex, STIF_SUPPORT_HEX, &nValue);
		pWchar = (WCHAR*)& nValue;
		cstr = pWchar;
		
		//替换掉unicode字符串
		unicodeStr.replace(index, 6, cstr);
	}


	return unicodeStr;
}

注意：目前好像发现有些字符转换不过来，比如 \u0456