基于WSAAsyncSelect模型实现的聊天室图形客户端

最新推荐文章于 2022-04-25 16:57:23 发布

原创最新推荐文章于 2022-04-25 16:57:23 发布 · 1w 阅读

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文章标签：

#聊天 #图形 #socket #network #服务器 #null

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本文介绍了一个使用C++编写的简单客户端聊天程序的设计与实现。该程序通过套接字进行网络通信，支持基本的连接、断开、发送消息等功能，并详细展示了如何处理网络事件。

对应的Linux服务器为：http://blog.youkuaiyun.com/microtong/archive/2009/12/12/4989902.aspx

头文件ClientDlg.h

// ClientDlg.h : 头文件 // #pragma once #include "afxcmn.h" #include "afxwin.h" #define WM_NETWORK WM_USER+100 // CClientDlg 对话框 class CClientDlg : public CDialog { // 构造 public: CClientDlg(CWnd* pParent = NULL); // 标准构造函数 // 对话框数据 enum { IDD = IDD_CLIENT_DIALOG }; protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持 // 实现 protected: HICON m_hIcon; // 生成的消息映射函数 virtual BOOL OnInitDialog(); afx_msg void OnSysCommand(UINT nID, LPARAM lParam); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); DECLARE_MESSAGE_MAP() public: CIPAddressCtrl m_ip; int m_port; CEdit m_allmsg; CString m_nickname; CString m_message; afx_msg void OnBnClickedConnect(); // 服务器套接字 SOCKET sock; struct sockaddr_in serverAddr; CString msg; LRESULT OnNetwork(WPARAM wParam, LPARAM lParam); void OnConnect(SOCKET s); void OnRead(SOCKET s); void OnCloseSocket(SOCKET s); afx_msg void OnBnClickedSend(); afx_msg void OnBnClickedDisconnect(); afx_msg void OnClose(); afx_msg void OnBnClickedQuit(); afx_msg void OnBnClickedChangeName(); };

对话框源文件 ClientDlg.cpp

// ClientDlg.cpp : 实现文件 // #include "stdafx.h" #include "Client.h" #include "ClientDlg.h" #ifdef _DEBUG #define new DEBUG_NEW #endif // 用于应用程序“关于”菜单项的 CAboutDlg 对话框 class CAboutDlg : public CDialog { public: CAboutDlg(); // 对话框数据 enum { IDD = IDD_ABOUTBOX }; protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持 // 实现 protected: DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); } BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) END_MESSAGE_MAP() // CClientDlg 对话框 CClientDlg::CClientDlg(CWnd* pParent /*=NULL*/) : CDialog(CClientDlg::IDD, pParent) , m_port(8000) , m_nickname(_T("microtong")) , m_message(_T("hello")) { m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } void CClientDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); DDX_Control(pDX, IDC_IP, m_ip); DDX_Text(pDX, IDC_PORT, m_port); DDX_Control(pDX, IDC_ALLMESSAGE, m_allmsg); DDX_Text(pDX, IDC_NICKNAME, m_nickname); DDV_MaxChars(pDX, m_nickname, 30); DDX_Text(pDX, IDC_MESSAGE, m_message); DDV_MaxChars(pDX, m_message, 1024); } BEGIN_MESSAGE_MAP(CClientDlg, CDialog) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() //}}AFX_MSG_MAP ON_BN_CLICKED(IDC_CONNECT, &CClientDlg::OnBnClickedConnect) ON_BN_CLICKED(IDC_SEND, &CClientDlg::OnBnClickedSend) ON_BN_CLICKED(IDC_DISCONNECT, &CClientDlg::OnBnClickedDisconnect) ON_WM_CLOSE() ON_BN_CLICKED(IDC_QUIT, &CClientDlg::OnBnClickedQuit) ON_BN_CLICKED(IDC_CHANGENAME, &CClientDlg::OnBnClickedChangeName) ON_MESSAGE(WM_NETWORK,&CClientDlg::OnNetwork) END_MESSAGE_MAP() // CClientDlg 消息处理程序 BOOL CClientDlg::OnInitDialog() { CDialog::OnInitDialog(); // 将“关于...”菜单项添加到系统菜单中。 // IDM_ABOUTBOX 必须在系统命令范围内。 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE); if (pSysMenu != NULL) { CString strAboutMenu; strAboutMenu.LoadString(IDS_ABOUTBOX); if (!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } } // 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动 // 执行此操作 SetIcon(m_hIcon, TRUE); // 设置大图标 SetIcon(m_hIcon, FALSE); // 设置小图标 // TODO: 在此添加额外的初始化代码 //为测试方便IP地址初始化为本机IP地址 m_ip.SetAddress(127,0,0,1); return TRUE; // 除非将焦点设置到控件，否则返回 TRUE } void CClientDlg::OnSysCommand(UINT nID, LPARAM lParam) { if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialog::OnSysCommand(nID, lParam); } } // 如果向对话框添加最小化按钮，则需要下面的代码 // 来绘制该图标。对于使用文档/视图模型的 MFC 应用程序， // 这将由框架自动完成。 void CClientDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // 用于绘制的设备上下文 SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0); // 使图标在工作矩形中居中 int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // 绘制图标 dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } //当用户拖动最小化窗口时系统调用此函数取得光标显示。 // HCURSOR CClientDlg::OnQueryDragIcon() { return static_cast<HCURSOR>(m_hIcon); } void CClientDlg::OnBnClickedConnect() { UpdateData(TRUE); DWORD ip; m_ip.GetAddress(ip); //初始化套接字DLL WSADATA wsa; if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){ MessageBox("套接字初始化失败!"); return; } //创建套接字 if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){ MessageBox("创建套接字失败！"); WSACleanup(); return; } ZeroMemory(&serverAddr,sizeof(serverAddr)); serverAddr.sin_family = AF_INET; serverAddr.sin_addr.S_un.S_addr = htonl(ip); serverAddr.sin_port = htons(m_port); //注册感兴趣的网络事件 if(WSAAsyncSelect(sock, m_hWnd, WM_NETWORK, FD_CONNECT | FD_READ | FD_CLOSE)==SOCKET_ERROR){ MessageBox("注册网络事件失败！"); closesocket(sock); WSACleanup(); } msg.Format("Connecting to %s:%d/n",inet_ntoa(serverAddr.sin_addr), ntohs(serverAddr.sin_port)); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); if(connect(sock, (struct sockaddr*)&serverAddr, sizeof(serverAddr))==SOCKET_ERROR){ int err = WSAGetLastError(); if(err==WSAEWOULDBLOCK){ msg.Format("Waiting....../n"); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); }else{ MessageBox("无法连接到服务器！"); closesocket(sock); WSACleanup(); } } GetDlgItem(IDC_DISCONNECT)->EnableWindow(TRUE); GetDlgItem(IDC_SEND)->EnableWindow(TRUE); GetDlgItem(IDC_CHANGENAME)->EnableWindow(TRUE); GetDlgItem(IDC_CONNECT)->EnableWindow(FALSE); GetDlgItem(IDC_IP)->EnableWindow(FALSE); GetDlgItem(IDC_PORT)->EnableWindow(FALSE); } LRESULT CClientDlg::OnNetwork(WPARAM wParam, LPARAM lParam) { SOCKET s = (SOCKET)wParam; WORD netEvent = WSAGETSELECTEVENT(lParam); WORD error = WSAGETSELECTERROR(lParam); if(error!=0){ msg.Format("Error code: %d/n",error); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); if(error==WSAECONNREFUSED){ msg.Format("Connection refused./n"); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); closesocket(sock); WSACleanup(); GetDlgItem(IDC_DISCONNECT)->EnableWindow(FALSE); GetDlgItem(IDC_SEND)->EnableWindow(FALSE); GetDlgItem(IDC_CHANGENAME)->EnableWindow(FALSE); GetDlgItem(IDC_CONNECT)->EnableWindow(TRUE); GetDlgItem(IDC_IP)->EnableWindow(TRUE); GetDlgItem(IDC_PORT)->EnableWindow(TRUE); } return -1; } switch(netEvent){ case FD_CONNECT: OnConnect(s); break; case FD_READ: OnRead(s); break; case FD_CLOSE: OnCloseSocket(s); break; } return 0; } void CClientDlg::OnConnect(SOCKET s) { msg.Format("Connected to %s:%d/n",inet_ntoa(serverAddr.sin_addr),ntohs(serverAddr.sin_port)); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); } void CClientDlg::OnRead(SOCKET s) { static char buf[4096]; int bytes; bytes = recv(s, buf, sizeof(buf), 0); if(bytes==SOCKET_ERROR || bytes==0){ msg.Format("Socket error %d/n",WSAGetLastError()); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); closesocket(s); return; } buf[bytes] = '/0'; m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(buf); m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel("/n"); } void CClientDlg::OnCloseSocket(SOCKET s) { closesocket(s); msg = "Connection closed./n "; m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); GetDlgItem(IDC_DISCONNECT)->EnableWindow(FALSE); GetDlgItem(IDC_SEND)->EnableWindow(FALSE); GetDlgItem(IDC_CHANGENAME)->EnableWindow(FALSE); GetDlgItem(IDC_CONNECT)->EnableWindow(TRUE); GetDlgItem(IDC_IP)->EnableWindow(TRUE); GetDlgItem(IDC_PORT)->EnableWindow(TRUE); WSACleanup(); } void CClientDlg::OnBnClickedSend() { UpdateData(TRUE); int bytes; bytes = send(sock,(const char*)m_message,m_message.GetLength(),0); if(bytes==SOCKET_ERROR){ int error = WSAGetLastError(); if(error==WSAEWOULDBLOCK){ msg = "Send failed for message: "; msg+=m_message; }else{ msg.Format("Connection is down."); } m_allmsg.SetSel(32767,32767); m_allmsg.ReplaceSel(msg); } } void CClientDlg::OnBnClickedDisconnect() { shutdown(sock,SD_SEND); } void CClientDlg::OnClose() { //MessageBox("close"); closesocket(sock); WSACleanup(); CDialog::OnClose(); } void CClientDlg::OnBnClickedQuit() { SendMessage(WM_CLOSE); } void CClientDlg::OnBnClickedChangeName() { UpdateData(TRUE); char buf[100]; sprintf(buf,"name %s",m_nickname); if(send(sock,buf,strlen(buf),0)==SOCKET_ERROR){ MessageBox("发送改名命令失败！"); return; } }

原理请参考我的课件： http://www.oakcms/network