C + + implementation of UTF-8 encoding and Unicode encoding mutual transfer __HTML5

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1.utf-8 Turn Unicode

Wstring utf8tounicode (const string& str)
{
 int  len = 0;
 Len = Str.length ();
 int  Unicodelen =:: MultiByteToWideChar (Cp_utf8,
            0,
            str.c_str (),
            -1,
            NULL,
            0); 
 wchar_t *  Punicode; 
 Punicode = new  wchar_t[unicodelen+1]; 
 Memset (punicode,0, (unicodelen+1) *sizeof (wchar_t)); 
 :: MultiByteToWideChar (Cp_utf8,
         0,
         str.c_str ( ),
         -1,
         (LPWSTR) Punicode,
         Unicodelen); 
 Wstring  RT; 
 RT = (wchar_t*) punicode;
 Delete  Punicode;

 return  RT; 
}

2.Unicode Turn UTF-8

string UnicodeToUTF8 (const wstring& str) {char* pelementtext;
 int Itextlen;
         Wide char to multi char Itextlen = WideCharToMultiByte (Cp_utf8, 0, Str.c_str (),-1,
 NULL, 0, NULL, NULL);
 Pelementtext = new Char[itextlen + 1];
 memset ((void*) pelementtext, 0, sizeof (char) * (Itextlen + 1));
         :: WideCharToMultiByte (Cp_utf8, 0, Str.c_str (),-1, Pelementtext, Itextlen,
 NULL, NULL);
 String StrText;
 StrText = Pelementtext;
 Delete[] Pelementtext;
return strText; }