protobuf 消息里用 bytes 存的图片数据 但是在 Server 上拼回来的图片无法解析 没有丢包的情况，大小拼的是正确的 是 string 类型的原因吗？

void Combine()
{
    vector temp = msgs;
    msgs.clear();
    ProtoHead head = temp.front().head();
    int size = head.total_size();
    cout << "char:" << size << endl;
    char *result = new (std::nothrow) char[size];
    int pos = 0;
    int cnt = 0;
    for (auto pack : temp)
    {
        cnt++;
        int size = pack.body().data_size();
        string temp = pack.body().data();
        //memcpy(result + pos, &temp, size);
        for (auto ele : temp)
            result[pos++] = ele;
        //pos += size;
        //cout << cnt << " " << pos << endl;
        pack.release_body();
        pack.release_head();
    }
    ofstream fout(path_out.c_str(), ios::binary);
    fout.write(result, sizeof(char) * size);
    fout.close();
}