Windows Visual Studio C++字符集UTF-8和GBK互转

#include "stdafx.h"
#include 
#include  

std::string GBKToUTF8(const std::string& strGBK)
{
	std::string strOutUTF8 = "";
	WCHAR * str1;
	int n = MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, NULL, 0);
	str1 = new WCHAR[n];
	MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, str1, n);
	n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL);
	char * str2 = new char[n];
	WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL);
	strOutUTF8 = str2;
	delete[]str1;
	str1 = NULL;
	delete[]str2;
	str2 = NULL;
	return strOutUTF8;
}

std::string UTFtoGBK(const char* utf8)
{
	int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
	wchar_t* wstr = new wchar_t[len + 1];
	memset(wstr, 0, len + 1);
	MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
	len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
	char* str = new char[len + 1];
	std::string str_temp;
	memset(str, 0, len + 1);
	WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL);
	str_temp.assign(str_temp);
	if (wstr)
		delete[] wstr;

	std::string str_return;
	str_return.assign(str);

	if (str)
		delete[] str;
	return str_return;
}

int _tmain(int argc, _TCHAR* argv[])
{
	std::string teststr = "测试字符串";

	std::cout<< "原始字符串：" << teststr.c_str() << std::endl;

	std::cout<< "GBK转换UTF8后的字符串：" << GBKToUTF8(teststr).c_str() << std::endl;

	std::cout<< "UTF8转换GBK后的字符串：" << UTFtoGBK(GBKToUTF8(teststr).c_str()).c_str() << std::endl;

	getchar();

	return 0;
}