client.c

linux下的聊天程序

/*********************客户端*************************************************/
//client.c
//#include <stdio.h> 
//#include <winsock2.h> 
//#include <string.h> 
//#include <conio.h> 
#include "../lib/myinclude.h"

int client; 
//WSADATA WSAData; 
int WSAreturn; 
struct sockaddr_in to; 
char information[256]; 
char welcome[]="wo yi jing deng lu dao ni de zhu ji!\n"; 
char receive[256]; 
char chatto[256]; 
char servername[256]; 
char chatfrom[256]; 
char c; 
long result; 
int cansend = 1; 
////////////////////////////////连接函数////////////////////////////////////////////
int connection() 
{
	client = socket(AF_INET,SOCK_STREAM,0);
	to.sin_family = AF_INET;
	to.sin_port = htons(SERV_PORT); 

	while(1) {
		printf("Please enter the server IP:"); 
		scanf("%s",&servername); 
		to.sin_addr.s_addr = inet_addr(servername); 
		printf("正在连接...\n");
		result = connect(client,(struct sockaddr *)&to,sizeof(to));
		if(result == -1) {           // 连接失败  
			printf("对不起,无法连接到目标主机!\n"); 
			return 0; 
		}
		else {
			cansend = 0;
			recv(client,receive,sizeof(receive),0); 
			printf("*******欢迎消息消息*******\n");
			printf("%s\n",receive);
			printf("***********结束*********\n");
			cansend = 1;
			while(1) {
				if(cansend) {
					printf("请输入下一条信息:");
					scanf("%s\0",&chatto);
					send(client,chatto,strlen(chatto),0);
					printf("\n已经成功发送信息!\n"); 
					cansend = 0;
				} 
				else {
					printf("正在等待对方发来消息...\n"); 
					cansend = 0;
				       recv(client,chatfrom,sizeof(chatfrom),0);
					printf("*******接收到的消息*******\n");
					printf("%s\n",chatfrom);
					printf("***********结束*********\n");
					cansend = 1;
				}
			}
		}
	}
	closesocket(client); 
	return 1; 
}
//////////////////////客户端主函数///////////////////////////////////////////
int main() 
{
	connection(); 
	getchar(); 
} 
//local.sin_port = htons((u_short)23); 
//端口 23 一般保留给 telnet 用的，最好 1024 以下的端口都不要用， 
//unix 系统会要求 root 才能绑定的 (当然 Windows 不会有这个要求)。 
//建议用户可自己设置端口。