Tcp_sync_server and Tcp_sync_client

#include <iostream>

#include <fstream>

#include <sstream>

#include <boost/asio.hpp>

using namespace Std;

Using Boost::asio::ip::tcp;

Const char* servicelist = "\n\t services\n"

"\t**************************\n"

"\t[1] Get current time.\n"

"\t[2" who ' s online.\n "

"\t[3] Get system info.\n"

"\t**************************\n\n"

"Please pick a service[1-3]:";

Ifstream fin;

void GetResult (const string& cmdprefix, const char* OutputFile,

string& Res) {

cmd = = "W > who"

String cmd (Cmdprefix + outputFile);

System (CMD.C_STR ());//parse string into system command, then execute

Fin.open (outputFile);//exist open file, otherwise create

if (Fin) {ostringstream os; OS << fin.rdbuf (); res = OS.STR ();

}

if (Fin.is_open ()) {fin.close (); }

}

String getservicecontent (const int& Select) {

string res;

Switch (SELECT) {//time (0) Gets the current time, CTime converts the time into a word

Character string.  Case 1: {time_t t = time (0); res = CTime (&t); Break

} Case 2:getresult ("W >", "who", res);   Break Case 3:getresult ("Uname-a >", "uname", res); Break

Default:res = "Sorry, no such service.\n";     Break }

return res; }

int main () {try {Boost::asio::io_service io_service;//#1

Tcp::acceptor acceptor (Io_service, Tcp::endpoint (tcp::v4//tcp::endpoint (endpoint) consists of an IP address, a port number, and a protocol version.

(), 8868)); #2 for (;;) {tcp::socket socket (io_service);//#3

Acceptor.accept (socket); #4

1, Send service list to client

Boost::system::error_code Ignored_error;

Boost::asio::write (socket, Boost::asio::buffer (servicelist),//buffer equivalent to a buffer of the monitor, a container for temporarily storing data

Boost::asio::transfer_all (), ignored_error); Self-feeling read and write are a fixed routine

2, receive selection from client char selection[20];

size_t n = socket.read_some (Boost::asio::buffer (selection),

IGNORED_ERROR); 3, send response

String response = Getservicecontent (atoi (selection));

Boost::asio::write (socket, Boost::asio::buffer (response),

Boost::asio::transfer_all (), ignored_error);

}//#6} catch (std::exception& e) {

Std::cerr << e.what () << Std::endl; }

return 0; }

Tcp_sync_server and Tcp_sync_client