有道云笔记
tcp服务器
#include
#define PORT 8899
#define IP "192.168.125.114"
int main(int argc, const char *argv[])
{
int sfd=-1;
if((sfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket");
return -1;
}
#if 1
int reuse=1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
{
perror("setsocket");
return -1;
}
#endif
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");
return -1;
}
if(listen(sfd,128)==-1)
{
perror("listen");
return -1;
}
struct sockaddr_in cin;
socklen_t socklen=sizeof(cin);
int newfd;
if((newfd=accept(sfd,(struct sockaddr*)&cin,&socklen))==-1)
{
perror("accept");
return -1;
}
printf("[%s:%d]:newfd=%d\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
char buf[128];
while(1)
{
bzero(buf,sizeof(buf));
int res=recv(newfd,buf,sizeof(buf),0);
if(res==0)
{
printf("结束\n");
break;
}
printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
strcat(buf,"*_*");
send(newfd,buf,sizeof(buf),0);
}
close(newfd);
close(sfd);
return 0;
}
tcp客户端
#include
#define SERIP "192.168.125.114"
#define SERPORT 8899
int main(int argc, const char *argv[])
{
int cfd;
if((cfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket");
return -1;
}
int reuse=1;
if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
{
perror("setsockopt");
return -1;
}
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(SERPORT);
sin.sin_addr.s_addr=inet_addr(SERIP);
if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin))==-1)
{
perror("connect");
return -1;
}
char buf[128];
while(1)
{
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
send(cfd,buf,sizeof(buf),0);
bzero(buf,sizeof(buf));
int res=recv(cfd,buf,sizeof(buf),0);
if(res==0)
{
printf("结束\n");
return -1;
}
printf("[%s:%d]:%s\n",SERIP,SERPORT,buf);
}
close(cfd);
return 0;
}
udp服务器
#include
#define PORT 8877
#define IP "192.168.125.114"
int main(int argc, const char *argv[])
{
//1创建一个sfd
int sfd;
if((sfd=socket(AF_INET,SOCK_DGRAM,0))==-1)
{
perror("socket");
return -1;
}
//2端口号快速重用
int reuse=1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
{
perror("setsockopt");
return -1;
}
//3填充 绑定sfd
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");
return -1;
}
//4收发数据
char buf[128];
struct sockaddr_in cin;
socklen_t socklen=sizeof(cin);
while(1)
{
bzero(buf,sizeof(buf));
recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,&socklen);
printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
strcat(buf,"*_*");
sendto(sfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,sizeof(cin));
}
//5关闭
close(sfd);
return 0;
}
udp客户端
#include
#define PORT 8877
#define IP "192.168.125.114"
int main(int argc, const char *argv[])
{
//1创建一个套接字
int cfd;
if(socket(AF_INET,SOCK_DGRAM,0)==-1)
{
perror("socket");
return -1;
}
#if 0
//2速用
int reuse=1;
if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
{
perror("setsockopt");
return -1;
}
#endif
//3绑定IP端口号非必要
//4定义服务器地址结构体发送数据
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(PORT);
sin.sin_addr.s_addr=inet_addr(IP);
char buf[128];
while(1)
{
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
sendto(cfd,buf,sizeof(buf),0,(struct sockaddr *)&sin,sizeof(sin));
recvfrom(cfd,buf,sizeof(buf),0,NULL,NULL);
printf("buf=%s\n",buf);
}
//5关
close(cfd);
return 0;
}