简单的TCP回射服务

 1 //TCP服务器端
 2 #include <stdio.h>
 3 #include <winsock2.h>
 4 #include <Windows.h>
 5 
 6 #pragma comment(lib,"ws2_32.lib")
 7 #define  PORT 6000
 8 int main()
 9 {
10     char buf[512];//接发数据的缓冲区
11     memset(buf, 0, 1024);//格式化缓冲区
12     SOCKET serversock = INVALID_SOCKET;//用来监听信息的套接字
13     SOCKET acceptsock = INVALID_SOCKET;//用来接发数据的套接字
14     struct sockaddr_in clientAddr;// 保存客户端地址信息
15     struct sockaddr_in serverAddr;//保存本地主机地址信息
16     int serAddrLen = sizeof(serverAddr);
17     //初始化套接字
18     WSADATA wsa;
19     if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
20     {
21         printf("套接字初始化失败：%d.\n",WSAGetLastError());
22         return -1;
23     }
24     printf("套接字初始化完成..........\n");
25     //建立一个TCP套接字
26    serversock = socket(AF_INET, SOCK_STREAM, 0);
27     if (serversock == SOCKET_ERROR)
28     {
29         printf("创建套接字失败：%d.\n",WSAGetLastError());
30         return -1;
31     }
32     printf("成功创建套接字...........\n");
33     //绑定地址信息
34     serverAddr.sin_family = AF_INET;
35     serverAddr.sin_port = htons(PORT);
36     serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
37     if (bind(serversock, (SOCKADDR*)& serverAddr, sizeof(serverAddr)) == SOCKET_ERROR)
38     {
39         printf("绑定套接字失败：%d.\n", WSAGetLastError());
40         closesocket(serversock);
41         WSACleanup();
42         return -1;
43     }
44     printf("绑定成功,准备监听..........\n");
45     //监听套接字
46     if (listen(serversock, 5) == SOCKET_ERROR)
47     {
48         printf("监听失败：%d.\n", WSAGetLastError());
49         closesocket(serversock);
50         WSACleanup();
51         return -1;
52     }
53     printf("准备接受连接请求..........\n");
54     if ((acceptsock = accept(serversock, (SOCKADDR*)& serverAddr, &serAddrLen)) == SOCKET_ERROR)
55     {
56         printf("接收连接请求失败.\n");
57         closesocket(acceptsock);
58         WSACleanup();
59         return -1;
60     }
61     printf("准备收发数据..........\n");
62     while (1)
63     {
64         //接收客户端发来的数据
65         recv(acceptsock, buf, 512, 0);
66         printf("接收到的数据:%s.\n",buf);
67         //如发现exit，则退出循环
68         if (strncmp(buf, "exit", sizeof("exit")) == 0)
69         {
70             printf("退出接收循环.....\n");
71             break;
72         }
73         // 返回数据给客户端
74         send(acceptsock, buf, strlen(buf), 0);
75         printf("返回的的数据：%s.\n\n",buf);
76         memset(buf, 0, sizeof(buf));
77     }
78     return 0;
79 }

 1 //TCP客户端
 2 #include <stdio.h>
 3 #include <winsock2.h>
 4 #include <Windows.h>
 5 
 6 #pragma comment(lib,"ws2_32.lib")
 7 #define  PORT 6000
 8 int main()
 9 {
10     char buf[1024];//发送缓冲区
11     char recvBuf[1024];//接收缓冲区
12     memset(buf, 0, 1024); //格式化缓冲区
13     memset(recvBuf, 0, 1024);//格式化缓冲区
14     struct sockaddr_in serAddr;//保存服务器端地址信息
15     int ServerAddrLen = sizeof(serAddr);
16     //初始化套接字
17     WSADATA wsa;
18     if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
19     {
20         printf("初始化失败.\n");
21         return -1;
22     }
23     printf("套接字初始化成功..........\n");
24     //建立一个TCP套接字
25     SOCKET clientsock= socket(AF_INET, SOCK_STREAM, 0);
26     if (clientsock== INVALID_SOCKET)
27     {
28         printf("套接字创建失败.\n");
29         return -1;
30     }
31     printf("成功创建套接字..........\n");
32     //保存服务器的地址信息
33     serAddr.sin_family = AF_INET;
34     serAddr.sin_port = htons(PORT);
35     serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
36     printf("准备连接到：%s:%d....\n", inet_ntoa(serAddr.sin_addr), htons(serAddr.sin_port));
37     //连接到服务器端
38     if (connect(clientsock, (SOCKADDR*)& serAddr, &ServerAddrLen) == SOCKET_ERROR)
39     {
40         printf("连接到服务器端失败：%d", WSAGetLastError());
41         closesocket(clientsock);
42         WSACleanup();
43             return -1;
44     }
45     printf("连接成功，准备发送数据........\n");
46     while (1)
47     {
48         printf("\n要发送的数据为：");
49         gets(buf);//获取缓冲区中数据
50         //发送数据
51         int Sent = send(clientsock, buf, strlen(buf), 0);
52         if (Sent == 0)
53         {
54             printf("要发送的数据失败....\n");
55             return -1;
56         }
57         // 接收数据
58         int Recv = recv(clientsock, recvBuf, 255, 0);
59         if (Recv == 0)
60         {
61             printf("数据接收失败.....\n");
62             return -1;
63         }
64         printf("从服务接收到的数据：%s\n\n", recvBuf);
65         memset(recvBuf, 0, sizeof(recvBuf));
66     }
67     //关闭SOCKET连接
68     closesocket(clientsock);
69     WSACleanup();
70     system("pause");
71     return 0;
72 }