用C语言在WIN32下编译一个简单的聊天程序，客户端向服务器发消息，服务器接到消息后会返回一个

#include<stdio.h>#include<stdlib.h>

#include<string.h>

#include<sys/types.h>

#include<errno.h>

#include<netinet/in.h>

#include<sys/socket.h>

#define SERVERPORT 5555#define BACKLOG 10

#define MAXLEN 1024

int main(){

int sockfd,client_fd

int sin_size = 0

int recvlen = 0

char recvbuf[MAXLEN]={0}

struct sockaddr_in my_addr

struct sockaddr_in cli_addr

int iRet

/*建立socke通信*/

if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){

printf("Create socket error\n\n")

exit(1)

}

printf("socket success\n")

my_addr.sin_family=AF_INET my_addr.sin_port=htons(SERVERPORT)

my_addr.sin_addr.s_addr=INADDR_ANY

memset(my_addr.sin_zero,0,8)

/*绑定socket端口*/

if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr)) == -1){

printf("bind error\n")

close(sockfd)

exit(1)

}

printf("bind success\n")

/*监听端口*/

if(listen(sockfd,BACKLOG) == -1){

printf("listen error\n!")

close(sockfd)

exit(1)

}

printf("listren success\n")

while(1) {

sin_size = sizeof(struct sockaddr_in)

/*阻塞等待客户端发送消息*/

if((client_fd=accept(sockfd,(struct sockaddr *)&cli_addr,&sin_size)) == -1)

{

printf("accept error !")

continue

}

printf("accept success\n")

printf("receive a connection form %s\n",inet_ntoa(cli_addr.sin_addr))

/*fork进程，子进程处理接收的信息*/

iRet=fork()

if(iRet <0)

{

printf(" fork err, pid=[%d]", getpid())

}

/*fork返回0，为子进程*/

else if(iRet == 0)

{

printf("pid=[%d]", getpid())

printf("子进程\n")

memset(recvbuf,0,sizeof(recvbuf))

/*接收客户端发送的内容*/

if((recvlen = recv(client_fd,recvbuf,MAXLEN,0)) == -1)

{

printf("recv error\n")

close(client_fd)

exit(1)

}

printf("recvlen[%d]\n",recvlen)

printf("recvmsg:\n%s\n",recvbuf)

/*向客户端发送内容*/ if(send(client_fd,recvbuf,recvlen,0) == -1)

{

printf("send error\n")

close(client_fd)

exit(1)

}

printf("sendmsg:\n%s\n",recvbuf)

close(client_fd)

exit(0)

}

/*父进程，返回子进程pid*/

else

{

printf("pid=[%d]", getpid())

printf("父进程\n")

continue

}

}

close(sockfd)

exit(0)

}

很简单啊,聊天器分为服务端和客户端,客户端运行后你设定每隔多少秒就自动发一次设定好的信息到服务端,服务端收到之后就把这客户端设置为在线,过了多少秒没收到信息就设置为不在线,你直接获取服务端设置的状态就行了

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