libevent_study/test_http_client/test_http_client.cpp


#include <iostream>
#include<event2/event.h>
#include <event2/listener.h>
#include <event2/http.h>
#include <event2/listener.h>
#include <event2/buffer.h>
#include <event2/bufferevent.h>
#include <string.h>
#ifndef _WIN32
#include <signal.h>
#endif // !_WIN32


using namespace std;


void  http_client_cb(struct evhttp_request *req, void *ctx) {
	cout << "http_client_cb" << endl;
	bufferevent *bev = (bufferevent*)ctx;
	if (req == NULL) {
		int errcode = EVUTIL_SOCKET_ERROR();
		cout << "socket error: " << evutil_socket_error_to_string(errcode) << endl;
		return;
	}

	//获取path
	const char* path = evhttp_request_get_uri(req);
	cout << "request path is " << path << endl;

	//获取返回的code
	cout << "Respone: " << evhttp_request_get_response_code(req);
	cout << "" << evhttp_request_get_response_code_line(req) << endl;
	char buf[1024] = { 0 };
	evbuffer *input = evhttp_request_get_input_buffer(req);
	for (;;) {
		int len = evbuffer_remove(input,buf,sizeof(buf)-1);
		if(len <=0 )
			buf[len] = 0;
	}
}


int main()
{
#ifdef _WIN32
	//初始化socket库
	WSADATA wsa;
	WSAStartup(MAKEWORD(2, 2), &wsa);
#else 
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) { //忽略管道信号，发送数据给已关闭的socket，会飞掉！
		return 1;
	}
#endif

	//创建libevent上下文
	event_base* base = event_base_new();

	// 生成请求信息 GET
	//string http_url = "http://www.pyfup.com/index.html?id=1";
	string http_url = "http://121.4.70.4:3000//index.html?id=1";  //地址 自己换着测试

	evhttp_uri *uri = evhttp_uri_parse(http_url.c_str());
	const char* schemo =  evhttp_uri_get_scheme(uri);
	if (!schemo) {
		cerr << "schemo is null" << endl;
		return -1;
	}
	cout << "schemo is " << schemo << endl;

	int port = evhttp_uri_get_port(uri);
	if (port < 0) {
		if (strcmp(schemo, "http") == 0)
			port = 80;
	}

	cout << "host is " << port << endl;

	const char* host = evhttp_uri_get_host(uri);
	if (!host) {
		cerr << "host is null" << endl;
		return -1;
	}

	cout << "host is " << host << endl;
	const char *path = evhttp_uri_get_path(uri);
	if (!path || strlen(path) == 0) {
		path = "/";
	}
	cout << "path is " << path << endl;



	//?号之后的内容
	const char* query = evhttp_uri_get_query(uri);
	if (query) {
		cout << "query is " << query << endl;
	}


	bufferevent *bev = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
	evhttp_connection *evcon = evhttp_connection_base_bufferevent_new(base, NULL, bev, host, port);
	evhttp_request *req = evhttp_request_new(http_client_cb, bev);

	//设置请求的head 消息报头 信息
	struct evkeyvalq*out_put_headers = evhttp_request_get_output_headers(req);
	evhttp_add_header(out_put_headers, "Host", host);

	//发起请求
	evhttp_make_request(evcon, req, EVHTTP_REQ_GET, path);




	if (base)
		event_base_dispatch(base); //事件分发处理

	if (base)
		event_base_free(base);

#if _WIN32
	WSACleanup();
#endif // _WIN32



	return 0;
}