VC++ 下编码的转换

1、将GBK转换成UTF8

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;
}

2、将UTF8转换成GBK

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;
}