1.基于TCP的通信(面向连接的通信)
服务器代码实现:
#include <myhead.h>
#define IP "192.168.126.91"
#define PORT 9999
int main(int argc, const char *argv[])
{
//1、创建套接字
int sfd=-1;
if((sfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket error");
return -1;
}
printf("sfd=%d\n",sfd);
//2、绑定
//将服务器的地址信息结构体绑定到sfd文件描述符中
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(PORT);
sin.sin_addr.s_addr=inet_addr(IP);
if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
{
perror("bind error");
return -1;
}
//设置监听
if(listen(sfd,128)==-1)
{
perror("listen error");
return -1;
}
//accept连接
//创建连接之后的客户端地址信息结构体
struct sockaddr_in cin;
socklen_t socklen=sizeof(cin);
int newfd=accept(sfd,(struct sockaddr*)&cin,&socklen);
if(newfd==-1)
{
perror("accept error");
return -1;
}
printf("[%s:%d]连接成功\n",inet_ntoa(cin.sin_addr)\
,ntohs(cin.sin_port));
//进行数据的收发
char rbuf[128]="";
while(1)
{
//接收客户端的消息
bzero(rbuf,sizeof(rbuf));
int res=recv(newfd,rbuf,sizeof(rbuf),0);
if(res==0||strcmp(rbuf,"quit")==0)
{
printf("客户端下线\n");
break;
}
printf("[%s:%d]:发送的消息为%s\n",inet_ntoa(cin.sin_addr)\
,ntohs(cin.sin_port),rbuf);
//发送消息到客户端
strcat(rbuf,"*_*");
send(newfd,rbuf,sizeof(rbuf),0);
}
//关闭文件描述符
close(sfd);
close(newfd);
return 0;
}
客户端的代码实现:
#include <myhead.h>
#define IP "192.168.126.91"
#define PORT 9999
int main(int argc, const char *argv[])
{
int cfd=-1;
if((cfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket error");
return -1;
}
//连接服务器
struct sockaddr_in cin;
cin.sin_family=AF_INET;
cin.sin_port=htons(PORT);
cin.sin_addr.s_addr=inet_addr(IP);
if(connect(cfd,(struct sockaddr*)&cin,sizeof(cin))==-1)
{
perror("connect error");
return -1;
}
char wbuf[128]="";
while(1)
{
bzero(wbuf,sizeof(wbuf));
printf("请输入>>>");
fgets(wbuf,sizeof(wbuf),stdin);
wbuf[strlen(wbuf)-1]=0;
send(cfd,wbuf,strlen(wbuf),0);
if(strcmp("quit",wbuf)==0)
{
printf("客户端下线\n");
break;
}
//接收的数据
bzero(wbuf,sizeof(wbuf));
recv(cfd,wbuf,sizeof(wbuf),0);
printf("收到的消息是:%s\n",wbuf);
}
return 0;
}
运行结果:
2.基于UDP的通信(面向无连接的通信)
服务器端代码实现:
#include <myhead.h>
#define PORT 3333
#define IP "192.168.126.91"
int main(int argc, const char *argv[])
{
//创建套接字
int sfd=-1;
if((sfd=socket(AF_INET,SOCK_DGRAM,0))==-1)
{
perror("socket error");
return -1;
}
printf("sfd=%d\n",sfd);
//绑定端口号和ip
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(PORT);
sin.sin_addr.s_addr=inet_addr(IP);
if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
{
perror("bind error");
return -1;
}
//创建对端地址信息结构体
struct sockaddr_in cin;
socklen_t socklen=sizeof(cin);
char rbuf[128]="";
while(1)
{
bzero(rbuf,sizeof(rbuf));
if(recvfrom(sfd,rbuf,sizeof(rbuf),0,(struct sockaddr*)&cin,&socklen)==-1)
{
perror("recvfrom error");
return -1;
}
if(strcmp(rbuf,"quit")==0)
{
printf("客户端下线\n");
break;
}
printf("收到的消息是:%s\n",rbuf);
//给客户端回一个消息
//bzero(rbuf,sizeof(rbuf));
strcat(rbuf,"*_*");
if(sendto(sfd,rbuf,sizeof(rbuf),0,(struct sockaddr*)&cin,socklen)==-1)
{
perror("sendto error");
return -1;
}
}
close(sfd);
return 0;
}
客户端代码实现:
#include <myhead.h>
#define PORT 3333
#define IP "192.168.126.91"
int main(int argc, const char *argv[])
{
//创建套接字
int cfd=-1;
if((cfd=socket(AF_INET,SOCK_DGRAM,0))==-1)
{
perror("socket error");
return -1;
}
printf("cfd=%d\n",cfd);
//创建对端地址信息结构体
struct sockaddr_in cin;
cin.sin_family=AF_INET;
cin.sin_port=htons(PORT);
cin.sin_addr.s_addr=inet_addr(IP);
socklen_t socklen=sizeof(cin);
char wbuf[128]="";
while(1)
{
bzero(wbuf,sizeof(wbuf));
printf("请输入>>>");
fgets(wbuf,sizeof(wbuf),stdin);
wbuf[strlen(wbuf)-1]=0;
if(sendto(cfd,wbuf,sizeof(wbuf),0,(struct sockaddr*)&cin,socklen)==-1)
{
perror("sendto error");
return -1;
}
if(strcmp(wbuf,"quit")==0)
{
printf("客户端下线\n");
break;
}
bzero(wbuf,sizeof(wbuf));
if(recvfrom(cfd,wbuf,sizeof(wbuf),0,(struct sockaddr*)&cin,&socklen)==-1)
{
perror("recvfrom error");
return -1;
}
printf("收到服务器的消息为%s\n",wbuf);
}
close(cfd);
return 0;
}
运行结果: