Linux平台下基于TCP/IP协议的C++网络编程初步

Linux平台下基于TCP/IP协议的C++网络编程初步

实验平台：Ubuntu(Linux)

开发工具：Eclipse+CDT

作者：@郑海波 http://blog.csdn.net/nuptboyzhb/

特点：

1.基于Linux平台的网络编程，最重要的特点是要调用Linux的API函数。这是与windows平台最大的不同。

2.我们将发送的消息封装成结构体，增添了其传递消息的复杂性。

3.我们用的是socket编程，没有用ACE网络编程。

服务器：

[c++ code]

[cpp] view
plaincopy

/*

* MyMain.cpp

*

* Created on: 2012-9-19

* Author: zhb

*/

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <arpa/inet.h>

#include <unistd.h>

#define SERVPORT 3333

#define BACKLOG 10

#define MAXSIZE 1024

/*

*自定义信息

*/

typedef struct MyMessage{

int ID;

char info[256];

}MyMessage,*pMyMessage;

int main() {

int sockfd, client_fd;

struct sockaddr_in my_addr;

struct sockaddr_in remote_addr;

//创建套接字

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

perror("socket create failed!");

exit(1);

}

//绑定端口地址

my_addr.sin_family = AF_INET;

my_addr.sin_port = htons(SERVPORT);

my_addr.sin_addr.s_addr = INADDR_ANY;

bzero(&(my_addr.sin_zero), 8);

if (bind(sockfd, (struct sockaddr*) &my_addr, sizeof(struct sockaddr))== -1) {

perror("bind error!");

exit(1);

}

//监听端口

if (listen(sockfd, BACKLOG) == -1) {

perror("listen error");

exit(1);

}

while (1) {

//int sin_size = sizeof(struct sockaddr_in);

socklen_t sin_size = sizeof(struct sockaddr_in);

if ((client_fd = accept(sockfd,(struct sockaddr*) &remote_addr,&sin_size)) == -1){

perror("accept error!");

continue;

}

printf("Received a connection from %s\n", (char*)inet_ntoa(remote_addr.sin_addr));

//子进程段

if (!fork()){

//接受client发送的请示信息

int rval;

char buf[MAXSIZE];

if ((rval = read(client_fd, buf, MAXSIZE)) < 0) {

perror("reading stream error!");

continue;

}

printf("%s\n", buf);

//向client发送信息

//char* msg = "Hello,Mr hqlong, you are connected!\n";

MyMessage data;

memset((void *)&data,0,sizeof(MyMessage));

data.ID=123;

strcpy(data.info,"This message come from ServSocket!");

if(send(client_fd,(void*)&data,sizeof(MyMessage),0) == -1){

perror("send error!");

}

close(client_fd);

exit(0);

}

close(client_fd);

}

return 0;

}

客户端：

[c++ code]

[cpp] view
plaincopy

/*

* MyMainClient.cpp

*

* Created on: 2012-9-19

* Author: zhb

*/

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <arpa/inet.h>

#include <unistd.h>

#define SERVPORT 3333

#define MAXDATASIZE 100

#define SERVER_IP "127.0.0.1"

#define DATA "this is a client message"

/*

*自定义信息

*/

typedef struct MyMessage{

int ID;

char info[256];

}MyMessage,*pMyMessage;

int main(int argc, char* argv[]) {

int sockfd, recvbytes;

//char buf[MAXDATASIZE];

MyMessage recvData;

struct sockaddr_in serv_addr;

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

perror("socket error!");

exit(1);

}

bzero(&serv_addr, sizeof(serv_addr));

serv_addr.sin_family = AF_INET;

serv_addr.sin_port = htons(SERVPORT);

serv_addr.sin_addr.s_addr = inet_addr(SERVER_IP);

if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(struct sockaddr))== -1) {

perror("connect error!");

exit(1);

}

write(sockfd, DATA, sizeof(DATA));

memset((void *)&recvData,0,sizeof(MyMessage));

if ((recvbytes = recv(sockfd, (void *)&recvData,sizeof(MyMessage), 0)) == -1) {

perror("recv error!");

exit(1);

}

//buf[recvbytes] = '\0';

printf("Received:ID=%d,Info= %s",recvData.ID,recvData.info);

close(sockfd);

return 0;

}