【C语言】实现简易网络聊天室
项目：
制作一个简易的聊天室，实现实时非单机聊天
知识点：
总体框架：
socket() 创造套接字函数：
然后设置 bind() ，调整 IP 参数：
然后设置 listen() ：
然后设置 accept() ：
收发数据 recv(), send()/sendto(), read(), write() ：
最后关闭 close() ：
因为本身 socket 是一种文件描述符，所以最后要关闭打开的文件
服务端：
1.创建sd
//创建sd
sd = socket(AF_INET,SOCK_STREAM,0);
if(sd == -1)
{
perror("create sd failed");
return -1;
}2.配置ip，端口属性
//设置ip，端口
server_ip.sin_family = AF_INET;
server_ip.sin_port = htons(5678);
server_ip.sin_addr.s_addr = htonl(INADDR_ANY);
memset(server_ip.sin_zero,0,8);3.绑定ip和客户端
//绑定ip和客户端
error = bind(sd,(struct sockaddr *) (&server_ip),sizeof(struct sockaddr));
if(error == -1)
{
perror("create bind failed");
close(sd);
return -1;
}4.设置最大链接数，这个宏定义MAX_LISLEN=2，因为我这里只连接2个客户端，可以设置多个
//设置最大链接数
error = listen(sd, MAX_LISLEN);
if(error == -1)
{
perror("create listem failed");
close(sd);
return -1;
}5.等待客户端连接
ad[i] = accept(sd,(struct sockaddr *)(&remote_ip),&remote_len);
if(ad[i] == -1)
{
perror("create ad failed");
close(sd);
return -1;
} 6.创造新线程，不断读取客户端发送的数据，别写入另外一个客户端
void * pthread_fun(void * arg)
{
while(1)
{
memset(buf,0,100);
read(ad[(int )arg],buf,100);
write(ad[((int )arg + 1) % 2],buf,100);
}
return (void *) 0;
}客户端 ：
1.创建sd
//创建sd
sd = socket(AF_INET,SOCK_STREAM,0);
if(sd == -1)
{
perror("create sd failed");
return -1;
}2.配置ip，端口属性
//设置ip，端口
server_ip.sin_family = AF_INET;
server_ip.sin_port = htons(5678);
server_ip.sin_addr.s_addr = htonl(INADDR_ANY);
memset(server_ip.sin_zero,0,8);3.连接服务端
//链接服务端
error = connect(sd, (struct sockaddr *) (&server_ip),sizeof(struct sockaddr));
if(error == -1)
{
perror("create connect failed");
close(sd);
return -1;
}4.创建两个新线程，不断写数据个服务端，不断从服务端读数据
void * pthread_fun_write(void * arg)
{
while(1)
{
memset(buf_write,0,100);
scanf("%s",buf_write);
write(sd,buf_write,100);
}
}
void * pthread_fun_read(void * arg)
{
while(1)
{
memset(buf_read,0,100);
read(sd,buf_read,100);
printf("client2:%s\n",buf_read);
}
}附录
服务端代码
#include
#include
#include /* See NOTES */
#include
#include
#include
#include
#include
#include
#define MAX_LISLEN 2
char buf_write[100];
char buf[100];
int ad[2];
struct sockaddr_in server_ip, remote_ip;
void * pthread_fun(void * arg)
{
while(1)
{
memset(buf,0,100);
read(ad[(int )arg],buf,100);
write(ad[((int )arg + 1) % 2],buf,100);
}
return (void *) 0;
}
int main()
{
pthread_t tid[2];
int server_len , remote_len;
int error, sd ;
int i = 0;
//创建sd
sd = socket(AF_INET, SOCK_STREAM ,0);
if(sd == -1)
{
perror("create sd failed");
return -1;
//close(sd);
}
//设置ip，端口
server_ip.sin_family = AF_INET;
server_ip.sin_port = htons(5678);
server_ip.sin_addr.s_addr = htonl(INADDR_ANY);
memset(server_ip.sin_zero,0,8);
//绑定ip和客户端
error = bind(sd,(struct sockaddr *) (&server_ip),sizeof(struct sockaddr));
if(error == -1)
{
perror("create bind failed");
close(sd);
return -1;
}
//设置最大链接数
error = listen(sd, MAX_LISLEN);
if(error == -1)
{
perror("create listem failed");
close(sd);
return -1;
}
remote_len = sizeof(struct sockaddr);
while(1)
{
//等待客户端申请
ad[i] = accept(sd,(struct sockaddr *)(&remote_ip),&remote_len);
if(ad[i] == -1)
{
perror("create ad failed");
close(sd);
return -1;
}
else
{
printf("client%d 加入聊天室\n",i+1);
}
//新线程，功能：不断读数据
error = pthread_create(&tid[i],NULL,pthread_fun,(void*) i);
if(error != 0)
{
perror("create pthread_fun failed");
close(ad[i]);
close(sd);
return -1;
}
i++;
}
close(sd);
return 0;
} 客户端1代码
#include
#include
#include /* See NOTES */
#include
#include
#include
#include
#include
#include
int sd;
char buf_write[100];
char buf_read[100];
struct sockaddr_in server_ip, remote_ip;
void * pthread_fun_write(void * arg)
{
while(1)
{
memset(buf_write,0,100);
scanf("%s",buf_write);
write(sd,buf_write,100);
}
}
void * pthread_fun_read(void * arg)
{
while(1)
{
memset(buf_read,0,100);
read(sd,buf_read,100);
printf("client2:%s\n",buf_read);
}
}
int main()
{
int server_len,remote_len;
pthread_t tid_read,tid_write;
int error;
sd = socket(AF_INET,SOCK_STREAM,0);
if(sd == -1)
{
perror("create sd failed");
return -1;
}
//设置ip，端口
server_ip.sin_family = AF_INET;
server_ip.sin_port = htons(5678);
server_ip.sin_addr.s_addr = htonl(INADDR_ANY);
memset(server_ip.sin_zero,0,8);
//链接服务端
error = connect(sd, (struct sockaddr *) (&server_ip),sizeof(struct sockaddr));
if(error == -1)
{
perror("create connect failed");
close(sd);
return -1;
}
error = pthread_create(&tid_write,NULL,pthread_fun_write,NULL);
if(error != 0)
{
perror("create pthread write failed");
close(sd);
return -1;
}
error = pthread_create(&tid_read,NULL,pthread_fun_read,NULL);
if(error != 0)
{
perror("create pthread read failed");
close(sd);
return -1;
}
pthread_join(tid_write,NULL);
pthread_join(tid_read,NULL);
return 0;
}
客户端2代码
#include
#include
#include /* See NOTES */
#include
#include
#include
#include
#include
#include
int sd;
char buf_write[100];
char buf_read[100];
struct sockaddr_in server_ip, remote_ip;
void * pthread_fun_write(void * arg)
{
while(1)
{
memset(buf_write,0,100);
scanf("%s",buf_write);
write(sd,buf_write,100);
}
}
void * pthread_fun_read(void * arg)
{
while(1)
{
memset(buf_read,0,100);
read(sd,buf_read,100);
printf("client1:%s\n",buf_read);
}
}
int main()
{
int server_len,remote_len;
pthread_t tid_read,tid_write;
int error;
sd = socket(AF_INET,SOCK_STREAM,0);
if(sd == -1)
{
perror("create sd failed");
return -1;
}
//设置ip，端口
server_ip.sin_family = AF_INET;
server_ip.sin_port = htons(5678);
server_ip.sin_addr.s_addr = htonl(INADDR_ANY);
memset(server_ip.sin_zero,0,8);
error = connect(sd, (struct sockaddr *) (&server_ip),sizeof(struct sockaddr));
if(error == -1)
{
perror("create connect failed");
close(sd);
return -1;
}
error = pthread_create(&tid_write,NULL,pthread_fun_write,NULL);
if(error != 0)
{
perror("create pthread write failed");
close(sd);
return -1;
}
error = pthread_create(&tid_read,NULL,pthread_fun_read,NULL);
if(error != 0)
{
perror("create pthread read failed");
close(sd);
return -1;
}
pthread_join(tid_write,NULL);
pthread_join(tid_read,NULL);
return 0;
}
写运行服务端创建sd，再运行客户端连接服务端，再不断加入客户端，注意最大加入数
运行结果：
想得美，直接动手