iconv 用法封裝

標籤：blog   os   2014   for   re   c   

std::string iconv_convert(const std::string& in, const char* fromcode, const char* tocode){    char buffer[128];    std::string out;    auto cd = iconv_open(tocode, fromcode);    if (cd != nullptr)    {        size_t outbytesleft = sizeof(buffer);        size_t inbytesleft = in.size();        const char* inbuf = in.c_str();        char* outbuf = buffer;        int ret = 0;        for (;;) {            ret = iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);            if (0 == ret)            {                out.insert(out.end(), buffer, buffer + sizeof(buffer)-outbytesleft);                break;            }            else {                assert(inbytesleft > 0);                assert(outbytesleft == 0);                out.insert(out.end(), buffer, buffer + sizeof(buffer));                outbytesleft = sizeof(buffer);                outbuf = buffer;            }        }    }    else {        return out;    }    (void)iconv_close(cd);    return out;}/// exampleint main(int, char**){    std::string utf8str = iconv_convert("你好嗎", "gb2312", "utf-8");    return 0;}