代码：

h文件

#include <iostream>
#include <curl/curl.h>

#include <net/if.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <string.h>

#include <event.h>
#include <event2/http.h>
#include <event2/http_struct.h>
#include <event2/http_compat.h>
#include <event2/util.h>

#include <jsoncpp/json/json.h>

#define ETH_NAME "eth0"
#define MYHTTPD_SIGNATURE   "MoCarHttpd v0.1"

using namespace std;

class RouteTasks{
public:
    RouteTasks();

    void init();

private:
    static void routeTasks(struct evhttp_request *req, void *arg);

    string getIp();

    int m_port;
    int m_timeout;
};

cpp文件

#include "platfromcommunication.h"

RouteTasks::RouteTasks()
{
    m_port = 7777;
    m_timeout = 120;
}

void RouteTasks::init()
{
    //初始化event API
    event_init();

    //创建一个http server
    struct evhttp *httpd;

    httpd = evhttp_start(getIp().c_str(), m_port);

    evhttp_set_timeout(httpd, m_timeout);

    //也可以为特定的URI指定callback
    evhttp_set_cb(httpd, "/wayLine/start", &RouteTasks::routeTasks, NULL);

    //循环处理events
    event_dispatch();

    evhttp_free(httpd);
}

void RouteTasks::routeTasks(evhttp_request *req, void *arg)
{
    char request_data[4096] = {0};

    //获取POST方法的数据
    size_t post_size = EVBUFFER_LENGTH(req->input_buffer);
    char *post_data = (char *) EVBUFFER_DATA(req->input_buffer);
    memcpy(request_data, post_data, post_size);
    printf("got startRouteTasks connection post_data = [%s], len =%ld\n", post_data, post_size);

    //解析获得的数据
    string task_code;
    string stream;

    Json::Value jvalue;
    Json::Reader jreader;
    jreader.parse(request_data, jvalue);
    task_code = jvalue["task_code"].asString();
    stream = jvalue["stream"].asString();
    cout<<"task_code: "<<task_code<<" stream: "<<stream<<"\n-------------------------"<<endl;

    //给前段回复一个响应结果
    Json::Value root;
    Json::FastWriter fastWriter;
    root["code"] = Json::Value("0");
    root["msg"] = Json::Value("成功");
    cout<<"return post"<<fastWriter.write(root)<<endl;

    /* 输出到客户端 */

    //HTTP header
    evhttp_add_header(req->output_headers, "Server", MYHTTPD_SIGNATURE);
    evhttp_add_header(req->output_headers, "Content-Type", "application/json; charset=UTF-8");
    evhttp_add_header(req->output_headers, "Connection", "close");

    //输出的内容
    struct evbuffer *buf;
    buf = evbuffer_new();
    evbuffer_add_printf(buf, "%s", fastWriter.write(root).c_str());

    //将封装好的evbuffer 发送给客户端
    evhttp_send_reply(req, HTTP_OK, "OK", buf);

    evbuffer_free(buf);

}

string RouteTasks::getIp()
{
    struct sockaddr_in sin;
    struct ifreq ifr;

    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if(sockfd == -1) {
        perror("socket error");
        return "";
    }

    strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);

    if(ioctl(sockfd, SIOCGIFADDR, &ifr) == 0) {
        memcpy(&sin, &ifr.ifr_addr, sizeof (ifr.ifr_addr));
        cout<<ETH_NAME<<" ip : "<<inet_ntoa(sin.sin_addr)<<endl;
        return inet_ntoa(sin.sin_addr);
    }

    return "";
}

 main文件

#include <iostream>
#include <signal.h>
#include <jsoncpp/json/json.h>
#include <event.h>
#include <unistd.h>

#include "...h"

using namespace std;

//当向进程发出SIGTERM/SIGHUP/SIGINT/SIGQUIT的时候，终止event的事件侦听循环
void signal_handler(int sig) {
    switch (sig) {
        case SIGTERM:
        case SIGHUP:
        case SIGQUIT:
        case SIGINT:
            event_loopbreak();  //终止侦听event_dispatch()的事件侦听循环，执行之后的代码
            break;
    }
}

int main()
{
    cout << "Hello World!" << endl;

    signal(SIGHUP, signal_handler);
    signal(SIGTERM, signal_handler);
    signal(SIGINT, signal_handler);
    signal(SIGQUIT, signal_handler);


    RouteTasks rt;

    rt.init();

    while (1) {
        sleep(1);
    }

    return 0;
}

http post与get请求：c++ curl post和get请求返回数据解析_c++解析curl返回的json_小鱼仙官的博客-CSDN博客