tcp局域网

服务端 server.c

#include <stdio.h>

#include <string.h>

#include <netinet/in.h>



#define PORT 9999



main()

{

    struct sockaddr_in client,server;

    int s,ns,clientlen,recievelen;

    char buf[256];



    s=socket(AF_INET,SOCK_STREAM,0);

    memset((char *)&server,sizeof(server),0);

    server.sin_family=AF_INET;

    server.sin_port=htons(PORT);

    server.sin_addr.s_addr=INADDR_ANY;

    bind(s,(struct sockaddr *)&server,sizeof(server));

    listen(s,1);

    clientlen=sizeof(client);

    ns=accept(s,(struct sockaddr *)&client,&clientlen);

    for(;;)

    {

        recievelen=recv(ns,buf,sizeof(buf),0);

        if(recievelen==0)

            break;

        printf("对方说: %s\n",buf);

        send(ns,buf,recievelen,0);

    }

    close(ns);

    close(s);

}



客户端 client.c

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <netinet/in.h>



#define PORT 9999

#define HOST_ADDR "192.168.8.35"



main()

{

    struct sockaddr_in server;

    int s,ns;

    int recievelen,buflen;

    char buf1[256],buf2[256];



    s=socket(AF_INET,SOCK_STREAM,0);

    server.sin_family=AF_INET;

    server.sin_port=htons(PORT);

    server.sin_addr.s_addr=inet_addr(HOST_ADDR);

    if(connect(s,(struct sockaddr *)&server,sizeof(server))<0)

    {

        perror("connect()");

        return;

    }

    for(;;)

    {

        printf("输入内容:");

        gets(buf1);

        buflen=strlen(buf1);

        if(buflen==0)

            break;

        send(s,buf1,buflen+1,0);

        recv(s,buf2,sizeof(buf2),0);

        printf("你说: %s\n",buf2);

    }

    close(s);

}