boost执行http的GET请求

boost执行http的GET请求。

////////////////////////////////////////////////////////////////////////////#include <libs/asio/example/cpp03/http/client/sync_client.cpp>//此代码以"boost_1_58_0_7z/libs/asio/example/cpp03/http/client/sync_client.cpp"为蓝本,略作修改.////////////////////////////////////////////////////////////////////////////// sync_client.cpp// ~~~~~~~~~~~~~~~//// Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)//// Distributed under the Boost Software License, Version 1.0. (See accompanying// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)//#include <iostream>#include <istream>#include <ostream>#include <string>#include <boost/asio.hpp>using boost::asio::ip::tcp;inline int boost_http_sync_client(const std::string& server, const std::string& port, const std::string& path,    std::string& out_response_status_line, std::string& out_response_header, std::string& out_response_data){  try  {    boost::asio::io_service io_service;    // Get a list of endpoints corresponding to the server name.    tcp::resolver resolver(io_service);    tcp::resolver::query query(server, port/*"http"*/);    tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);    // Try each endpoint until we successfully establish a connection.    tcp::socket socket(io_service);    boost::asio::connect(socket, endpoint_iterator);    // Form the request. We specify the "Connection: close" header so that the    // server will close the socket after transmitting the response. This will    // allow us to treat all data up until the EOF as the content.    boost::asio::streambuf request;    std::ostream request_stream(&request);    request_stream << "GET " << path/*argv[2]*/ << " HTTP/1.0\r\n";    request_stream << "Host: " << server/*argv[1]*/ << "\r\n";    request_stream << "Accept: */*\r\n";    request_stream << "Connection: close\r\n\r\n";    // Send the request.    boost::asio::write(socket, request);    // Read the response status line. The response streambuf will automatically    // grow to accommodate the entire line. The growth may be limited by passing    // a maximum size to the streambuf constructor.    boost::asio::streambuf response;    boost::asio::read_until(socket, response, "\r\n");    if (true)    {        boost::asio::streambuf::const_buffers_type cbt = response.data();        std::string temp_data(boost::asio::buffers_begin(cbt), boost::asio::buffers_end(cbt));        std::size_t idx = temp_data.find('\n');        idx == std::string::npos ? temp_data.size() : idx;        out_response_status_line = temp_data.substr(0, idx + 1);    }    // Check that response is OK.    std::istream response_stream(&response);    std::string http_version;    response_stream >> http_version;    unsigned int status_code;    response_stream >> status_code;    std::string status_message;    std::getline(response_stream, status_message);    if (!response_stream || http_version.substr(0, 5) != "HTTP/")    {      std::cout << "Invalid response\n";      return 1;    }    if (status_code != 200)    {      std::cout << "Response returned with status code " << status_code << "\n";      return 1;    }    // Read the response headers, which are terminated by a blank line.    boost::asio::read_until(socket, response, "\r\n\r\n");    if (true)    {        boost::asio::streambuf::const_buffers_type cbt = response.data();        std::string temp_data(boost::asio::buffers_begin(cbt), boost::asio::buffers_end(cbt));        std::size_t idx = temp_data.find("\r\n\r\n");        idx == std::string::npos ? temp_data.length() : idx;        out_response_header = temp_data.substr(0, idx + 2);    }    // Process the response headers.    std::string header;    while (std::getline(response_stream, header) && header != "\r")        ;//std::cout << header << "\n";    //std::cout << "\n";    // Write whatever content we already have to output.    //if (response.size() > 0)    //    std::cout << &response;    if (true)    {        boost::asio::streambuf::const_buffers_type cbt = response.data();        out_response_data = std::string(boost::asio::buffers_begin(cbt), boost::asio::buffers_end(cbt));    }    // Read until EOF, writing data to output as we go.    boost::system::error_code error;    while (boost::asio::read(socket, response,          boost::asio::transfer_at_least(1), error))        //std::cout << &response;    {        boost::asio::streambuf::const_buffers_type cbt = response.data();        out_response_data += std::string(boost::asio::buffers_begin(cbt), boost::asio::buffers_end(cbt));    }    if (error != boost::asio::error::eof)      throw boost::system::system_error(error);  }  catch (std::exception& e)  {    std::cout << "Exception: " << e.what() << "\n";    return -1;  }  return 0;}////////////////////////////////////////////////////////////////////////////可以解析下列三种类型的URL://http://yunhq.sse.com.cn:32041/v1/sh1/snap/204001?callback=jQuery_test&select=name%2Clast%2Cchg_rate%2Cchange%2Camount%2Cvolume%2Copen%2Cprev_close%2Cask%2Cbid%2Chigh%2Clow%2Ctradephase//http://hq.sinajs.cn/list=sh204001//https://www.baidu.com//////////////////////////////////////////////////////////////////////////inline int parse_url(const std::string& url, std::string& out_server, std::string& out_port, std::string& out_path){    const std::string http___ = "http://";    const std::string https___ = "https://";    std::string temp_data = url;    if (temp_data.find(http___) == 0)        temp_data = temp_data.substr(http___.length());    else if (temp_data.find(https___) == 0)        temp_data = temp_data.substr(https___.length());    else        return -1;    std::size_t idx = temp_data.find('/');    if (std::string::npos == idx)    {        out_path = "/";        idx = temp_data.size();    }    else    {        out_path = temp_data.substr(idx);    }    out_server = temp_data.substr(0, idx);    idx = out_server.find(':');    if (std::string::npos == idx)    {        out_port = "http";        out_port = "80";    }    else    {        out_port = out_server.substr(idx + 1);        out_server = out_server.substr(0, idx);    }    return 0;}//inline int get_url_response(const std::string& url, std::string& out_response_data){    int rv = 0;    do    {        std::string server;        std::string port;        std::string path;        rv = parse_url(url, server, port, path);        if (rv)  break;        std::string out_response_status_line;        std::string out_response_header;        rv = boost_http_sync_client(server, port, path, out_response_status_line, out_response_header, out_response_data);        if (rv)  break;    } while (false);    return rv;}//int parse_hq_sinajs_cn_and_get_last_price(const std::string& market_data, double& last_price){    std::string temp_data = market_data;    std::size_t idx;    idx = temp_data.find('"');    if (std::string::npos == idx)        return -1;    temp_data = temp_data.substr(idx + 1);    idx = temp_data.find('"');    if (std::string::npos == idx)        return -1;    temp_data = temp_data.substr(0, idx);    std::vector<std::string> fields;    std::size_t beg_idx, end_idx;    for (beg_idx = end_idx = 0; (end_idx = temp_data.find(',', beg_idx)) != std::string::npos; beg_idx = end_idx + 1)        fields.push_back(temp_data.substr(beg_idx, end_idx - beg_idx));    fields.push_back(temp_data.substr(beg_idx));    if (fields.size() != 33)        return -1;    last_price = atof(fields[3].c_str());    return 0;}//int main(){    int rv = 0;    std::string url = "http://hq.sinajs.cn/list=sh204001";    std::string response_data;    rv = get_url_response(url, response_data);    if (rv)  return -1;    std::cout << response_data << std::endl;    double last_price = 0;    rv = parse_hq_sinajs_cn_and_get_last_price(response_data, last_price);    if (rv)  return -1;    std::cout << last_price << std::endl;    return 0;}

完。