string split.cc 序列化多个字符串, 网络传到另一台机器, 再反序列化他

string split.cc

#include <stdio.h>
#include <iostream>
#include <sstream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <stdio.h>
#include <math.h>

using namespace std;

//[len],[value][len],[value]....[-1]

string string_conn(string a, string b) {
    stringstream ss;
    ss << a.length() << "," << a << b.length() << "," << b << -1;
    return ss.str();
}

string string_conn(vector<string> vec) {
    stringstream ss;
    for (int i = 0; i < vec.size(); ++i) {
        ss << vec[i].length() << "," << vec[i];
    }
    ss << -1;
    return ss.str();
}

vector<string> string_split(string s) {
    vector<string> vec;
    int pos = 0;
    while (pos < s.length()) {
        int p = s.find(',', pos);
        if (p == string::npos) {
            break;
        }
        int len = atoi(s.substr(pos, p - pos).c_str());
        if (len < 0) {
            break; 
        }
        vec.push_back(s.substr(p + 1, len));
        pos = p + 1 + len;
    }
    return vec;
}

int main(int argc, char* argv[]) {
    string ans = string_conn(vector<string>(3, "abc"));
    cout << ans << endl;
    vector<string> res = string_split(ans);
    for (int i = 0; i < res.size(); ++i) {
        cout << "[" << res[i] << "]" <<  endl;
    }
    return 0;
}

协议是这么定的: 先传长度, 再传一个分隔符(,) 再传内容. 网络传输的时候, 不知道如何结束, 后面没有数据了, 就传一个-1进去. 不是二进制的-1, 而是字符串的"-1", 所以不用考虑大小端的问题.