1 #include<winsock2.h>//winsock的標頭檔案
 2 #include<iostream>
 3 using  namespace  std;
 4 
 5 //指定動態庫的lib檔案
 6 #pragma comment(lib,"ws2_32.lib")
 7 
 8 //TCP服務端
 9 int main()
10 {
11 
12     //初始化winsock2.2相關的動態庫
13     WSADATA  wd;//獲取socket相關資訊
14     if (WSAStartup(MAKEWORD(2, 2), &wd) != 0)//0表示成功
 

15     {
16         cout << "WSAStartup  error:"<< WSAGetLastError() << endl;
17         return 0;
18     }
19 
20     //1.建立TCP   socket , 流式套接字
21     SOCKET   s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
22     if (s == INVALID_SOCKET)
23     {
24         cout << "socket  error:
 
" << WSAGetLastError() << endl;
25         return 0;
26     }
27 
28     //2.繫結socket到一個IP地址和埠
29     sockaddr_in   addr;//不建議使用sockaddr，建議用sockaddr_in
30     addr.sin_port = htons(8000);//網路位元組序
31     addr.sin_addr.S_un.S_addr =inet_addr(  "127.0.0.1" );//網路位元組序
32     addr.sin_family = AF_INET; //地址族
33
 
     int len = sizeof(sockaddr_in);
34     if (bind(s, (sockaddr *)&addr, len) == SOCKET_ERROR)
35     {
36         cout << "bind  error:" << WSAGetLastError() << endl;
37         return 0;
38     }
39 
40     //3.監聽, 5代表正在等待完成相應的TCP三路握手過程的佇列長度
41     if(listen(s, 5) == SOCKET_ERROR)
42     {
43         cout << "listen  error:" << WSAGetLastError() << endl;
44         return 0;
45     }
46      
47 
48     //4.接受客戶端請求，並且返回和客戶端通訊的套接字
49     sockaddr_in   addrClient;// 儲存客戶端IP地址埠 
50     memset(&addrClient, 0, sizeof(sockaddr_in));
51      len = sizeof(sockaddr_in);
52     SOCKET c= accept(s, (sockaddr*)&addrClient, &len);//成功返回套接字
53     if (c == INVALID_SOCKET)
54     {
55         cout << "accept  error:" << WSAGetLastError() << endl;
56         return 0;
57     }
58 
59 
60     //5.傳送，接受訊息
61     int  ret = 0;
62     do
63     {
64         //向客戶端傳送資料,不能用監聽套接字s，而應該用accept返回的套接字c
65         ret = send(c, "I am  Server!", strlen("I am  Server!"), 0);//把flag置0
66 
67         //接受客戶端的訊息
68         char buf[64] = {'\0'};
69         ret = recv(c, buf, 64, 0);//把flag置0
70         cout << "recv" << inet_ntoa (  addrClient.sin_addr )<<":    "<< buf << endl;// inet_ntoa轉換為IP字串
71     } while (ret != SOCKET_ERROR &&  ret != 0);//對方關閉，返回0 ，錯誤返回SOCKET_ERROR
72 
73 
74     //6.關閉套接字
75     closesocket(s);
76 
77 
78     //清理winsock環境
79     WSACleanup();
80 
81 
82     return   0;
83 }