C语言Socket网络编程实例

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include <stdio.h>
 4 #include <winsock2.h>
 5 #pragma comment (lib, "ws2_32.lib") 
 6 
 7 /*
 8     TCP服务端
 9 */
10 int main(void)
11 {
12     int len = 0;
13     WSADATA         wd;
14     int ret = 0;
15     SOCKET s, c;
16     char sendBuf[1000] = "", recvBuf[1000] = "";
17     SOCKADDR_IN saddr, caddr;
18     ret = WSAStartup(MAKEWORD(2, 2), &wd);  /*1.初始化操作*/
19 
20     if (ret != 0)
21     {
22         return 0;
23     }
24     if (HIBYTE(wd.wVersion) != 2 || LOBYTE(wd.wVersion) != 2)
25     {
26         printf("初始化失败");
27         WSACleanup();
28         return 1;
29     }
30 
31     /*2.创建服务端socket*/
32     s = socket(AF_INET, SOCK_STREAM, 0);
33 
34     /*3.设置服务端信息*/
35     saddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
36     saddr.sin_family = AF_INET; /*协议类型*/
37     saddr.sin_port = htons(8888);
38 
39     /*4.绑定在本地端口*/
40     bind(s, (SOCKADDR *)&saddr, sizeof(SOCKADDR));
41 
42     /*5.监听端口*/
43     listen(s, 5);
44 
45     len = sizeof(SOCKADDR);
46 
47     while (1)
48     {
49         /*6.等待客户端连接，会阻塞在此处，直到有客户端连接到来。*/
50         c = accept(s, (SOCKADDR*)&caddr, &len);
51 
52         sprintf(sendBuf, "欢迎来到我的第一个socket，您的ip地址为：%s\n", inet_ntoa(caddr.sin_addr));
53 
54         /*7.发送数据到客户端*/
55         send(c, sendBuf, strlen(sendBuf) + 1, 0);
56 
57         /*8.接受客户端的返回*/
58         recv(c, recvBuf, 1000, 0);
59 
60         /*9.打印出客户端发送来的数据*/
61         printf("%s\n", recvBuf);
62 
63         /*10.如果不再跟这个客户端联系，就关闭它*/
64         closesocket(c);
65     }
66     /*如果有退出循环的条件，这里还需要清除对socket库的使用*/
67     /* WSACleanup();*/
68     return 0;
69 }

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include <stdio.h>
 4 #include <winsock2.h>
 5 #pragma comment (lib, "ws2_32.lib")
 6 
 7 int main(void)
 8 {
 9     WSADATA         wd;
10     int ret = 0;
11     SOCKET c;
12     char recvBuf[1000] = "", sendBuf[1000] = "";
13     SOCKADDR_IN saddr;
14     ret = WSAStartup(MAKEWORD(2, 2), &wd);  /*1.初始化操作*/
15 
16     if (ret != 0)
17     {
18         return 0;
19     }
20 
21     if (HIBYTE(wd.wVersion) != 2 || LOBYTE(wd.wVersion) != 2)
22     {
23         printf("初始化失败");
24         WSACleanup();
25         return 1;
26     }
27 
28     /*2.创建客户端socket*/
29     c = socket(AF_INET, SOCK_STREAM, 0);
30 
31     /*3.定义要连接的服务端信息*/
32     saddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
33     saddr.sin_family = AF_INET;
34     saddr.sin_port = htons(8888);
35 
36     /*4.连接服务端*/
37     connect(c, (SOCKADDR*)&saddr, sizeof(SOCKADDR));
38     recv(c, recvBuf, 1000, 0);
39     printf("服务端发来的数据:%s\n", recvBuf);
40 
41     sprintf(sendBuf, "服务端你好！！！");
42     send(c, sendBuf, strlen(sendBuf) + 1, 0);
43 
44     closesocket(c);
45     WSACleanup();
46 
47     getchar();
48     return 0;
49 }