GBK到UTF8编码转换C++实现

#include <iostream>
#include <string>
#include <fstream>
#include <windows.h> 

using namespace std;

string GBKToUTF8(const std::string& strGBK)
{
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;
}

string UTF8ToGBK(const std::string& strUTF8)
{
int len = MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, NULL, 0);
unsigned short * wszGBK = new unsigned short[len + 1];
memset(wszGBK, 0, len * 2 + 2);
    MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUTF8.c_str(), -1, wszGBK, len);

    len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
char *szGBK = new char[len + 1];
memset(szGBK, 0, len + 1);
    WideCharToMultiByte(CP_ACP,0, wszGBK, -1, szGBK, len, NULL, NULL);
//strUTF8 = szGBK;
std::string strTemp(szGBK);
delete[]szGBK;
delete[]wszGBK;
return strTemp;
}

int _tmain(int argc, _TCHAR* argv[])
{
string test("我们中国是个强大的名族，强大的动力来自每个人的支持");
    fstream output("test.txt",ios_base::out | ios_base::app);
    output << GBKToUTF8(test);
//system("iconv -f GBK -t utf-8");
return 0;
}