【网络编程笔记】简单的TCP协议 socket编程（C语言版服务器和客户端）

 1 void socketConnect()
 2 {
 3     char Server_name[128];
 4     WSADATA wsaData;
 5     struct hostent *hp;
 6     struct sockaddr_in addrServer;
 7     
 8     WSAStartup(0x202, &wsaData);
 9     
10     sockfd = socket(AF_INET, SOCK_STREAM, 0);   //socket
11     gethostname(Server_name, 128);
12     hp = gethostbyname(Server_name);           //获取本机名
13     printf("本机名 : %s\n", Server_name);
14 
15     memset(&addrServer, 0, sizeof(addrServer));    //初始化
16     memcpy(&(addrServer.sin_addr), hp->h_addr, hp->h_length); //设置服务器的IP地址
17     addrServer.sin_family = AF_INET;            //设置版本
18     addrServer.sin_port = htons((unsigned short)SERVER_PORT); //设置端口号
19     //bind....绑定ip地址和端口号
20     if(SOCKET_ERROR == bind(sockfd, (LPSOCKADDR)&addrServer, sizeof(addrServer)))
21     {
22         printf("Bind socket error!\n");
23         //exit(1);
24     }
25     else
26     {
27         printf("绑定 socket success...\n");
28     }
29     listen(sockfd, 5);     //listening...监听
30     printf("服务器监听状态...\n");
31 
32     ZeroMemory((void *)&addrtemp, sizeof(addrtemp));
33     nlen = sizeof(addrtemp);
34     connfd = accept(sockfd, &addrtemp, &nlen);  //accept...三次握手
35     printf("accept client success...\n\n");
36 }

 1 WSAStartup(0x202, &wsaData);
 2 if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) //socket...
 3 {
 4     printf("socket error!\n");
 5     exit(1);
 6 }    
 7 gethostname(Server_name, 128);
 8 host = gethostbyname(Server_name);        //获取本机名
 9 printf("本机名 : %s\n", Server_name);
10 
11 memset(&addrServer, 0, sizeof(addrServer)); //初始化
12 memcpy(&(addrServer.sin_addr), host->h_addr, host->h_length); //设置ip
13 addrServer.sin_family = AF_INET;                              //设置版本号
14 addrServer.sin_port = htons((unsigned short)SERVER_PORT);      //设置端口号
15 
16 //connect....向服务器发起链接
17 if(connect(sockfd, (struct sockaddr *)&addrServer, sizeof(struct sockaddr)))
18 {
19     printf("connect error!\n");
20     exit(1);
21 }
22 printf("连接服务器成功connec success...\n\n");

 1 //send...发送消息
 2 scanf("%s", sendBuf);
 3 getchar();
 4 
 5 if( (sendbytes = send(connfd, sendBuf, strlen(sendBuf), 0)) <= 0)
 6 {
 7     printf("send error !\n");
 8     continue;
 9 }
10 memset(sendBuf, 0, sizeof(sendBuf));

1 //recv...接收消息
2 memset(recvBuf, 0, sizeof(recvBuf));
3 if( (recvbytes = recv(connfd, recvBuf, sizeof(recvBuf), 0)) <= 0)
4 {
5     printf("recv error!\n");
6     exit(1);
7 }
8 printf("recvbytes = %d\n", recvbytes);
9 printf("recv from client : %s\n", recvBuf);