wchar和char的转换

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std::wstring CCToUnicode(const char * pszUtf8Str, unsigned len/* = -1*/){    std::wstring ret;    do    {        if (! pszUtf8Str) break;        // get UTF8 string length        if (-1 == len)        {            len = strlen(pszUtf8Str);        }        if (len <= 0) break;        // get UTF16 string length        int wLen = MultiByteToWideChar(CP_UTF8, 0, pszUtf8Str, len, 0, 0);        if (0 == wLen || 0xFFFD == wLen) break;                // convert string          wchar_t * pwszStr = new wchar_t[wLen + 1];        if (! pwszStr) break;        pwszStr[wLen] = 0;        MultiByteToWideChar(CP_UTF8, 0, pszUtf8Str, len, pwszStr, wLen + 1);        ret = pwszStr;        CC_SAFE_DELETE_ARRAY(pwszStr);    } while (0);    return ret;}std::string CCToUtf8(const wchar_t* pwszStr){    std::string ret;    do    {        if(! pwszStr) break;        size_t len = wcslen(pwszStr);        if (len <= 0) break;                size_t convertedChars = 0;        char * pszUtf8Str = new char[len*3 + 1];        WideCharToMultiByte(CP_UTF8, 0, pwszStr, len+1, pszUtf8Str, len*3 + 1, 0, 0);        ret = pszUtf8Str;        CC_SAFE_DELETE_ARRAY(pszUtf8Str);    }while(0);    return ret;}
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