tcpchat.c

tcp通讯源码

#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>

#define HOST_ADDR "192.168.1.100"
#define PORT 9999

main()
{
	struct sockaddr_in client,server,server1;
	int s,ns,s1,namelen,pktlen,buflen;
	char buf[256],buf1[256],buf2[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;
	s1=socket(AF_INET,SOCK_STREAM,0);
	server1.sin_family=AF_INET;
	server1.sin_port=htons(PORT);
	server1.sin_addr.s_addr=inet_addr(HOST_ADDR);
	bind(s,(struct sockaddr *)&server,sizeof(server));
	listen(s,1);
	printf("正在和对方建立连接……\n");
	for(;connect(s1,(struct sockaddr *)&server1,sizeof(server1))<0;);
	printf("连接成功！\n");
	namelen=sizeof(client);
	ns=accept(s,(struct sockaddr *)&client,&namelen);
	for(;;)
	{
		pktlen=recv(ns,buf,sizeof(buf),0);
		buflen=strlen(buf1);
		while(buflen==0 && pktlen==0)
		{
			printf("输入内容:");
			gets(buf1);
			buflen=strlen(buf1);
		}
		if(buflen==0 && pktlen!=0)
		{
	        	printf("对方说: %s\n",buf);
			printf("输入内容:");
			gets(buf1);
			buflen=strlen(buf1);
		}
		if(buflen!=0 && pktlen==0)
		{
			send(s,buf1,buflen+1,0);
	        	printf("你说: %s\n",buf1);
			printf("输入内容:");
			gets(buf1);
			buflen=strlen(buf1);
		}
		if(buflen!=0 && pktlen!=0)
		{
			send(s,buf1,buflen+1,0);
	        	printf("对方说: %s\n",buf);
	        	printf("你说: %s\n",buf1);
			printf("输入内容:");
			gets(buf1);
			buflen=strlen(buf1);
		}
	}
	close(ns);
	close(s);
	close(s1);
}