摘要：
="HTTP/"){reponse_data="Invalidresponse";return-2;}//如果服务器返回非200都认为有错,不支持301/302等跳转if(status_code!=200";returnstatus_code;}//传说中的包头可以读下来了std::stringheader;std::vectorheaders;while(std::getline(response_stream,header)&&header!
两个函数的区别：
提交表单数据和提交文本数据
表单数据：
request_stream << "Content-Type: application/x-www-form-urlencoded ";
文本数据：
request_stream << "Content-Type: text/html ";
#include <iostream> #include <istream> #include <ostream> #include <string> #include <boost/asio.hpp> usingboost::asio::ip::tcp; using std::string; int post_form(const string& host, const string& port, const string& page, const string& data, string&reponse_data) { try { boost::asio::io_service io_service; //如果io_service存在复用的情况 if(io_service.stopped()) io_service.reset(); //从dns取得域名下的所有ip tcp::resolver resolver(io_service); tcp::resolver::query query(host, port); tcp::resolver::iterator endpoint_iterator =resolver.resolve(query); //尝试连接到其中的某个ip直到成功 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 << "POST " << page << "HTTP/1.0 "; request_stream << "Host: " << host << ":" << port << " "; request_stream << "Accept: */* "; request_stream << "Content-Length: " << data.length() << " "; request_stream << "Content-Type: application/x-www-form-urlencoded "; request_stream << "Connection: close "; request_stream <<data; //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, " "); //Check that response is OK. std::istream response_stream(&response); std::stringhttp_version; response_stream >>http_version; unsigned intstatus_code; response_stream >>status_code; std::stringstatus_message; std::getline(response_stream, status_message); if (!response_stream || http_version.substr(0, 5) != "HTTP/") { reponse_data = "Invalid response"; return -2; } //如果服务器返回非200都认为有错,不支持301/302等跳转 if (status_code != 200) { reponse_data = "Response returned with status code != 200 "; returnstatus_code; } //传说中的包头可以读下来了 std::stringheader; std::vector<string>headers; while (std::getline(response_stream, header) && header != "") headers.push_back(header); //读取所有剩下的数据作为包体 boost::system::error_code error; while(boost::asio::read(socket, response, boost::asio::transfer_at_least(1), error)) { } //响应有数据 if(response.size()) { std::istream response_stream(&response); std::istreambuf_iterator<char>eos; reponse_data = string(std::istreambuf_iterator<char>(response_stream), eos); } if (error !=boost::asio::error::eof) { reponse_data =error.message(); return -3; } } catch(std::exception&e) { reponse_data =e.what(); return -4; } return 0; } int post_txt(const string& host, const string& port, const string& page, const string& data, string&reponse_data) { try { boost::asio::io_service io_service; //如果io_service存在复用的情况 if(io_service.stopped()) io_service.reset(); //从dns取得域名下的所有ip tcp::resolver resolver(io_service); tcp::resolver::query query(host, port); tcp::resolver::iterator endpoint_iterator =resolver.resolve(query); //尝试连接到其中的某个ip直到成功 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 << "POST " << page << "HTTP/1.0 "; request_stream << "Host: " << host << ":" << port << " "; request_stream << "Accept: */* "; request_stream << "Content-Length: " << data.length() << " "; request_stream << "Content-Type: text/html "; request_stream << "Connection: close "; request_stream <<data; //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, " "); //Check that response is OK. std::istream response_stream(&response); std::stringhttp_version; response_stream >>http_version; unsigned intstatus_code; response_stream >>status_code; std::stringstatus_message; std::getline(response_stream, status_message); if (!response_stream || http_version.substr(0, 5) != "HTTP/") { reponse_data = "Invalid response"; return -2; } //如果服务器返回非200都认为有错,不支持301/302等跳转 if (status_code != 200) { reponse_data = "Response returned with status code != 200 "; returnstatus_code; } //传说中的包头可以读下来了 std::stringheader; std::vector<string>headers; while (std::getline(response_stream, header) && header != "") headers.push_back(header); //读取所有剩下的数据作为包体 boost::system::error_code error; while(boost::asio::read(socket, response, boost::asio::transfer_at_least(1), error)) { } //响应有数据 if(response.size()) { std::istream response_stream(&response); std::istreambuf_iterator<char>eos; reponse_data = string(std::istreambuf_iterator<char>(response_stream), eos); } if (error !=boost::asio::error::eof) { reponse_data =error.message(); return -3; } } catch(std::exception&e) { reponse_data =e.what(); return -4; } return 0; } /* int main(int argc, char* argv[]) { string host = "127.0.0.1"; string port = "80"; string page = "/auth/login"; string data = "user_name=linbc&password=a"; string reponse_data; int ret = post(host, port, page, data, reponse_data); if (ret != 0) std::cout << "error_code:" << ret << std::endl; std::cout << reponse_data << std::endl; return 0; }*/