C++ socket编程 实现服务端与客户端的通讯



服务器端程序：

 // Server.cpp : Defines the entry point for the console application.
 //

 #include "winsock2.h"
 #pragma comment(lib, "ws2_32.lib")
 #include
 using namespace std;
 int main(int argc, char* argv[])
 {
     const int BUF_SIZE = 64;
     WSADATA         wsd;            //WSADATA变量
     SOCKET          sServer;        //服务器套接字
     SOCKET          sClient;        //客户端套接字
     SOCKADDR_IN     addrServ;;      //服务器地址
     char            buf[BUF_SIZE];  //接收数据缓冲区
     char            sendBuf[BUF_SIZE];//返回给客户端得数据
     int             retVal;         //返回值
     //初始化套结字动态库
     if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
     {
         cout << "WSAStartup failed!" << endl;
         return 1;
     }

     //创建套接字
     sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
     if(INVALID_SOCKET == sServer)
     {
         cout << "socket failed!" << endl;
         WSACleanup();//释放套接字资源;
         return  -1;
     }

     //服务器套接字地址
     addrServ.sin_family = AF_INET;
     addrServ.sin_port = htons(4999);
     addrServ.sin_addr.s_addr = INADDR_ANY;
     //绑定套接字
     retVal = bind(sServer, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN));
     if(SOCKET_ERROR == retVal)
     {
         cout << "bind failed!" << endl;
         closesocket(sServer);   //关闭套接字
         WSACleanup();           //释放套接字资源;
         return -1;
     }

     //开始监听
     retVal = listen(sServer, 1);
     if(SOCKET_ERROR == retVal)
     {
         cout << "listen failed!" << endl;
         closesocket(sServer);   //关闭套接字
         WSACleanup();           //释放套接字资源;
         return -1;
     }

     //接受客户端请求
     sockaddr_in addrClient;
     int addrClientlen = sizeof(addrClient);
     sClient = accept(sServer,(sockaddr FAR*)&addrClient, &addrClientlen);
     if(INVALID_SOCKET == sClient)
     {
         cout << "accept failed!" << endl;
         closesocket(sServer);   //关闭套接字
         WSACleanup();           //释放套接字资源;
         return -1;
     }

     while(true)
     {
         //接收客户端数据
         ZeroMemory(buf, BUF_SIZE);
         retVal = recv(sClient, buf, BUF_SIZE, 0);
         if (SOCKET_ERROR == retVal)
         {
             cout << "recv failed!" << endl;
             closesocket(sServer);   //关闭套接字
             closesocket(sClient);   //关闭套接字
             WSACleanup();           //释放套接字资源;
             return -1;
         }
         if(buf[0] == '0')
             break;
         cout << "客户端发送的数据: " << buf <

         cout << "向客户端发送数据: " ;
         cin >> sendBuf;

         send(sClient, sendBuf, strlen(sendBuf), 0);
     }

     //退出
     closesocket(sServer);   //关闭套接字
     closesocket(sClient);   //关闭套接字
     WSACleanup();           //释放套接字资源;

     return 0;
 }

客户端程序：

 #include "winsock2.h"
 #include
 #pragma comment(lib, "ws2_32.lib")

 using namespace std;
 BOOL RecvLine(SOCKET s, char* buf); //读取一行数据

 int main(int argc, char* argv[])
 {
 const int BUF_SIZE = 64;

 WSADATA wsd; //WSADATA变量
 SOCKET sHost; //服务器套接字
 SOCKADDR_IN servAddr; //服务器地址
 char buf[BUF_SIZE]; //接收数据缓冲区
 char bufRecv[BUF_SIZE];
 int retVal; //返回值
 //初始化套结字动态库
 if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
 {
 cout << "WSAStartup failed!" << endl;
 return -1;
 }
 //创建套接字
 sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 if(INVALID_SOCKET == sHost)
 {
 cout << "socket failed!" << endl;
 WSACleanup();//释放套接字资源
 return  -1;
 }

 //设置服务器地址
 servAddr.sin_family =AF_INET;
 servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
 servAddr.sin_port = htons((short)4999);
 int nServAddlen  = sizeof(servAddr);

 //连接服务器
 retVal=connect(sHost,(LPSOCKADDR)&servAddr, sizeof(servAddr));
 if(SOCKET_ERROR == retVal)
 {
 cout << "connect failed!" << endl;
 closesocket(sHost); //关闭套接字
 WSACleanup(); //释放套接字资源
 return -1;
 }
 while(true)
 {
 //向服务器发送数据
 ZeroMemory(buf, BUF_SIZE);
 cout << " 向服务器发送数据:  ";
 cin >> buf;
 retVal = send(sHost, buf, strlen(buf), 0);
 if (SOCKET_ERROR == retVal)
 {
 cout << "send failed!" << endl;
 closesocket(sHost); //关闭套接字
 WSACleanup(); //释放套接字资源
 return -1;
 }
 //RecvLine(sHost, bufRecv);
 ZeroMemory(bufRecv, BUF_SIZE);
 recv(sHost, bufRecv,BUF_SIZE , 0); // 接收服务器端的数据， 只接收5个字符
 cout << endl <<"从服务器接收数据："<< bufRecv;
 cout<<"\n";
 }
 //退出
 closesocket(sHost); //关闭套接字
 WSACleanup(); //释放套接字资源
 return 0;
 }