[转] Socket通信实例

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Client端：

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#define MAXLINE 1024

int main(int argc,char **argv)
{
	//char *servInetAddr = "10.68.6.28";
	int socketfd;
	struct sockaddr_in sockaddr;
	char recvline[MAXLINE], sendline[MAXLINE];
	int n;

	if(argc != 2)
	{
		printf("client <ipaddress> 
");
		exit(0);
	}
	
	printf("argv[0]=%s, argv[1]=%s
", argv[0], argv[1]);

	socketfd = socket(AF_INET,SOCK_STREAM,0);
	memset(&sockaddr,0,sizeof(sockaddr));
	sockaddr.sin_family = AF_INET;
	sockaddr.sin_port = htons(10004);
	//inet_pton(AF_INET,servInetAddr,&sockaddr.sin_addr);
	inet_pton(AF_INET,argv[1],&sockaddr.sin_addr);
	
	if((connect(socketfd,(struct sockaddr*)&sockaddr,sizeof(sockaddr))) < 0 )
	{
		printf("connect error %s errno: %d
",strerror(errno),errno);
		exit(0);
	}

	printf("send message to server
");

	fgets(sendline,1024,stdin);

	if((send(socketfd,sendline,strlen(sendline),0)) < 0)
	{
		printf("send mes error: %s errno : %d",strerror(errno),errno);
		exit(0);
	}

	close(socketfd);
	printf("exit
");
	exit(0);
}

编译client：

gcc client.c -o client

server端：

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>

#define MAXLINE 1024

int main(int argc,char **argv)
{
	int listenfd,connfd;
	struct sockaddr_in sockaddr;
	char buff[MAXLINE];
	int n;

	memset(&sockaddr,0,sizeof(sockaddr));

	sockaddr.sin_family = AF_INET;
	sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	sockaddr.sin_port = htons(10004);

	listenfd = socket(AF_INET,SOCK_STREAM,0);

	bind(listenfd,(struct sockaddr *) &sockaddr,sizeof(sockaddr));

	listen(listenfd,1024);


	printf("Please wait for the client information
");

	for(;;)
	{
		if((connfd = accept(listenfd,(struct sockaddr*)NULL,NULL))==-1)
		{
			printf("accpet socket error: %s errno :%d
",strerror(errno),errno);
			continue;
		}

		n = recv(connfd,buff,MAXLINE,0);
		buff[n] = '';
		printf("recv msg from client:%s",buff);
		close(connfd);
	}
	close(listenfd);
}

编译server：

gcc server.c -o server

测试：

g562044@shz-p0000601fl:~/Test/socket$ ./server &
[1] 24041
g562044@shz-p0000601fl:~/Test/socket$ Please wait for the client information

g562044@shz-p0000601fl:~/Test/socket$ ./client 127.0.0.1
send message to server // client 输出内容
Hello world! // client 输出内容
exit
recv msg from client:Hello world! // server 输出内容
g562044@shz-p0000601fl:~/Test/socket$