1 #include <winsock2.h>
 2 #include <ws2tcpip.h>
 3 #include <stdio.h>
 4 
 5 #pragma comment(lib, "ws2_32.lib")
 6 #define DEFAULT_PORT 27015
 7 #define DEFAULT_LISTEN_NUMBER 100
 8 #define DEFAULT_BUFFER 100
 9 
10 int main()
11 {
12     
13     WSADATA wsaData;
14     int iResult = 0;
15     struct sockaddr_in serverAddr;
16     struct sockaddr_in clientAddr;
17     SOCKET listenSocket;
18     SOCKET newConnection;
19     int clientAddrLen = 0;
20     char recvBuf[DEFAULT_BUFFER];
21     char sendBuf[DEFAULT_BUFFER] = "server";
22     int left = DEFAULT_BUFFER;
23     int idx = 0;
24 
25     iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
26     if (iResult != 0)
27     {
28         printf("WSAStartup failed with error %d\n", iResult);
29     }
30     
31     listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
32     
33     serverAddr.sin_family = AF_INET;
34     serverAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
35     serverAddr.sin_port = htons(DEFAULT_PORT);
36     
37     iResult = bind(listenSocket, (SOCKADDR *)&serverAddr, sizeof(serverAddr));
38     if (iResult == SOCKET_ERROR)
39     {
40         printf("bind failed with error %d\n", iResult);
41     }
42     
43     iResult = listen(listenSocket, DEFAULT_LISTEN_NUMBER);
44     if (iResult == SOCKET_ERROR)
45     {
46         printf("listen failed with error %d\n", iResult);
47     }
48     
49     clientAddrLen = sizeof(clientAddr);
50     newConnection = accept(listenSocket, (SOCKADDR *)&clientAddr, &clientAddrLen);
51     
52     iResult = recv(listenSocket, recvBuf, DEFAULT_BUFFER, 0);
53     if (iResult == SOCKET_ERROR)
54     {
55         printf("recv failed with error %d\n", iResult);
56     }
57     
58     printf("The client has send: %s\n", recvBuf);
59 
60     iResult = send(newConnection, sendBuf, strlen(sendBuf) + 1, 0);
61     if (iResult == SOCKET_ERROR)
62     {
63         printf("send failed with error %d\n", iResult);
64     }    
65     
66     
67     closesocket(newConnection);
68     closesocket(listenSocket);
69     
70     if (WSACleanup() == SOCKET_ERROR)
71     {
72         printf("WSACleanup failed with error %d\n", WSAGetLastError());
73     }
74     
75     return 0;
76 }

 1 #include <winsock2.h>
 2 #include <stdio.h>
 3 
 4 #pragma comment(lib, "ws2_32.lib")
 5 #define DEFAULT_PORT 27015
 6 #define DEFAULT_BUFFER 100
 7 
 8 int main()
 9 {
10     WSADATA wsaData;
11     SOCKET s;
12     struct sockaddr_in serverAddr;
13     int iResult = 0;
14     char sendBuf[DEFAULT_BUFFER] = "client";
15     char recvBuf[DEFAULT_BUFFER];
16     int left = DEFAULT_BUFFER;
17     int idx = 0;
18     
19     iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
20     if (iResult != 0)
21     {
22         printf("WSAStartup failed with error %d\n", iResult);
23     }
24 
25     s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
26     
27     serverAddr.sin_family = AF_INET;
28     serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
29     serverAddr.sin_port = htons(DEFAULT_PORT);
30     
31     iResult = connect(s, (SOCKADDR *)&serverAddr, sizeof(serverAddr));
32     if (iResult != 0)
33     {
34         printf("connect failed with error %d\n", iResult);
35     }
36 
37     iResult = send(s, "Hello world!", 13, 0);
38      if (iResult == SOCKET_ERROR)
39     {
40         printf("send failed with error %d\n", iResult);
41     }
42 
43     iResult = recv(s, recvBuf, DEFAULT_BUFFER, 0);
44     if (iResult == SOCKET_ERROR)
45     {
46         printf("recv failed with error %d\n", iResult);
47     }
48     printf("server has send: %s\n", recvBuf);
49     
50     closesocket(s);    
51     WSACleanup();
52     
53     return 0;
54 }