Socket编程

客户端程序：

// 下载基础信息void CTcpClientDlg::OnBnClickedBtnDownload(){// TODO: 在此添加控件通知处理程序代码WSADATA wsaData;int err;// 1、加载套接字库err = WSAStartup(MAKEWORD(2, 2), &wsaData);if (err != 0){MessageBox(_T("加载套接字库失败！"));return;}if (LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2) {WSACleanup( );MessageBox(_T("WinSock库不支持2.2版本！"));return; }// 2、创建套接字SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(9996); // 需要网络地址序// 3、向服务器发出连接请求err = connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));if (err == SOCKET_ERROR){CString strErr;strErr.Format(_T("连接失败：%s"), WSAGetLastError());MessageBox(strErr);return;}// 4、和服务器端进行通讯char recvBuf[100];recv(sockClient, recvBuf, 100, 0);printf_s("%s\n", recvBuf);send(sockClient, "this is hero...", strlen("this is hero...") + 1, 0);// 5、关闭套接字closesocket(sockClient);// 6、关闭加载的套接字库WSACleanup();}

服务端程序：

// 辅助线程处理函数BOOL bStart = FALSE;DWORD WINAPI ThreadProc(LPVOID lpParameter){WORD wVersionRequested;WSADATA wsaData;int iResult = 0;wVersionRequested = MAKEWORD(2, 2);// 1、初始化Windows Socket 2.2iResult = WSAStartup(wVersionRequested, &wsaData);if (iResult != NO_ERROR){/* Tell the user that we could not find a usable *//* WinSock DLL.                                  */AfxMessageBox(_T("初始化套接字失败！"));return 0;}/* Confirm that the WinSock DLL supports 2.2.*//* Note that if the DLL supports versions greater    *//* than 2.2 in addition to 2.2, it will still return *//* 2.2 in wVersion since that is the version we      *//* requested.                                        */if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE( wsaData.wVersion ) != 2){WSACleanup( );AfxMessageBox(_T("WinSock库不支持2.2版本！"));return 0;}// 2、创建套接字SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);if (INVALID_SOCKET == sockSrv){AfxMessageBox(_T("创建套接字！"));WSACleanup( );return 0;}// 3、绑定套接字到一个IP地址和一个端口上SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); // htonl将IP地址转换为网络格式addrSrv.sin_family = AF_INET;// 要使用1024以上的端口号addrSrv.sin_port = htons(9996);// 绑定到一个本地地址和端口上iResult = bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(addrSrv));if (iResult == SOCKET_ERROR){AfxMessageBox(_T("绑定失败！"));iResult = closesocket(sockSrv);if (iResult == SOCKET_ERROR){AfxMessageBox(_T("closesocket function failed with error %d\n"), WSAGetLastError());}WSACleanup();return 0;}// 4、将套接字设置为监听模式等待连接请求// 参数2：等待连接队列的最大长度if (listen(sockSrv, 5) == SOCKET_ERROR){wprintf(L"listen function failed with error: %d\n", WSAGetLastError());}SOCKADDR_IN addrClient;int len = sizeof(SOCKADDR);while(bStart){// 5、请求到来后，接受连接请求，返回一个新的对应于此次连接的套接字(accept())// 请求到来后，接受连接请求，返回一个新的对应于此次连接的套接字SOCKET sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);char sendBuf[100];sprintf_s(sendBuf, "Welcome %s to here!", inet_ntoa(addrClient.sin_addr));CString str;str.Format(_T("%s:"), inet_ntoa(addrClient.sin_addr));// 6、用返回的套接字和客户端进行通信(send()/recv())send(sockConn, sendBuf, strlen(sendBuf) + 1, 0);char recvBuf[100];recv(sockConn, recvBuf, 100, 0);printf("%s\n",recvBuf);// 关闭套接字iResult = closesocket(sockConn);if (iResult == SOCKET_ERROR){AfxMessageBox(_T("closesocket function failed with error %d\n"), WSAGetLastError());WSACleanup();return 0;}// 7、返回，等待另一连接请求；}closesocket(sockSrv);WSACleanup();return 0;}