Between Linux systems, network programming, message sending and receiving

Between Linux systems, network programming, message sending and receiving

[Email protected]:~/udp$ sudo apt-get update[email protected]:~/udp$ sudo apt-get install Build-essential[email protected]:~/udp$ sudo apt-get install make

[Email protected]:~/udp$ ll-rw-rw-r--1 Chunli Chunli 279 may 10:36 makefile-rw-rw-r--1 Chunli Chunli 2.3K May 15 10: myudp.cpp-rw-rw-r--1 Chunli Chunli (4) 10:37 myudp.h-rw-rw-r--1 Chunli Chunli 259 may 10:37 Stdafx.cpp files, compile a library file, the source code is below the text:

[Email protected]:~/udp$ makeg++-wall-fpic-d__unix-o myudp.o-c myudp.cppg++-o libmyudp.so myudp.o-shared ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ OK ^_^ ^_^ ^_^, ^_^ ^_^ ^_^

Write a main program

vim main.c#include <stdio.h> #include  <stdlib.h> #include  <string.h># include  "Myudp.h" Int main (int argc, char args[]) {         if  (argc < 2)         {                 bind_socket (8080);                 char buf[1024] =  { 0 };                 char IP[100] = { 0 };                 memset (buf, 0, sizeof (BUF));                 recv_socket (Buf, sizeof (BUF), &NBSP;IP);                 printf ("from %s :  %s \n ", Ip,buf);        } else         {                 char buf[1024] = {  "hello world!"  };                send_ Socket ("127.0.0.1",  8080, buf, strlen (BUF));         }         return 0;}

compile [email protected]:~/udp$ gcc main.c-l.-lmyudp Send to native [email protected]:~/udp$./a.out 127.0.0.1 waiting to receive [email protected]:~ /udp$./a.outfrom 127.0.0.1:hello world!

Source:

[Email protected]:~/udp$ cat makefile. Suffixes:. cpp. occ=g++srcs=myudp.cppobjs=$ (SRCS:.CPP=.O) Out=libmyudp.soall: $ (OBJS) $ (CC)-O $ (out) $ (OBJS)-  Shared@echo ' ^_^ ^_^ ^_^ ^_^ ^_^ ^_^ OK ^_^ ^_^ ^_^ ". CPP.O: $ (CC)-wall-fpic-d__unix-o [email protected]-C $<clean:-rm-f $ (OBJS)-rm-f core*

[email protected]:~/udp$ cat myudp.cpp // myudp.cpp :  definition  DLL  The export function of the application. #include  <string.h> #include   "stdafx.h" #ifndef  __unix#include <winsock2.h># Pragma comment (lib,  "ws2_32.lib") #pragma  warning (disable:4996) #else #include <sys/ types.h> #include  <sys/socket.h> #include  <unistd.h> #include  <arpa/inet.h># Include <netinet/in.h> #define  socket int#endifsocket st = 0;// Global socket Variable Void init_sosket () {if  (st == 0) {#ifndef  __UNIXunsigned short ver; Wsadata wsadata;ver = makeword (1, 1); WSAStartup (ver, &wsadata);//Initialize socketchar on = 1; #elseint  on = 1;# Endifst = socket (af_inet, sock_dgram, 0);//Establish udp socketsetsockopt (St, SOL_SOCKET ,  so_broadcast, &on, sizeof (on));//set to send UDP broadcast messages}}void free_socket () {if  (ST) {#ifndef  __unixclosesocket (ST); WSACleanup (); #elseclose (ST); #endifst  = 0;}} extern  "C" {#ifndef  __unix__declspec (dllexport) #endifint  bind_socket (unsigned short  Port) {init_sosket (); Struct sockaddr_in recv_addr;memset (&recv_addr, 0, sizeof (recv_ addr)); Recv_addr.sin_family = af_inet;recv_addr.sin_port = htons (port);// Specifies that port is the port number to connect to recv_addr.sin_addr.s_addr = htonl (inaddr_any);//Specifies that the receive end IP address is any return bind (st,  (struct sockaddr *)  &recv_addr, sizeof (RECV_ADDR));} #ifndef  __unix__declspec (dllexport) #endifunsigned  int recv_socket (char *buf, size_t &NBSP;BUFSIZE,&NBSP;CHAR&NBSP;*SRCIP) {Struct sockaddr_in addr;memset (&addr, 0, sizeof ( addr)); #ifndef  __unixint len = sizeof (addr); #elsesocklen_t  len = sizeof ( addr); #endifunsigned  int rc = recvfrom (St, buf, bufsize, 0,  (struct sockaddr *)  &addr, &len);// Received a message from Srcip strcpy (Srcip, inet_ntoa (ADDR.SIN_ADDR)); RETURN&NBSP;RC;} #ifndef  __unix__declspec (dllexport) #endifunsigned  int send_socket (Const char *destip,  unsigned short port, const char *buf, size_t bufsize) {init_sosket (); Struct sockaddr_in addr;memset (&addr, 0, sizeof (addr)); addr.sin_family = af_ Inet;addr.sin_port = htons (port);//Specify Port as the port number to connect to ADDR.SIN_ADDR.S_ADDR&NBSP;=&NBSP;INET_ADDR (DestIP) ;//Specify IP address to connect to Return sendto (st, buf, bufsize, 0,  (struct sockaddr *)  &addr, sizeof (addr));//Send message to specified IP}}

[Email protected]:~/udp$ cat myudp.h #ifndef __myudp_h#define __myudp_hint bind_socket (unsigned short port); unsigned int Recv_socket (char *buf, size_t bufsize, char *srcip); unsigned int send_socket (const char *destip, unsigned short port, cons T Char *buf, size_t bufsize); #endif

[Email protected]:~/udp$ cat stdafx.h//stdafx.h: The standard system contains file containing files,//or frequently used but infrequently changed//project-specific Include files//#ifndef __unix#pragma Onc E#include "Targetver.h" #define WIN32_LEAN_AND_MEAN//Exclude very little used information from the Windows header file//Windows header file: #include <win Dows.h> #endif//TODO: Refer to other header files required by the program here

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Between Linux systems, network programming, message sending and receiving