UDP测试代码，至少十一个字

 // MFCApplication3Dlg.cpp: 实现文件 // #define _WINSOCK_DEPRECATED_NO_WARNINGS #include <iostream> #include <afxwin.h> // 包含MFC的头文件 #pragma comment(lib, "ws2_32.lib") #include "framework.h" #include "MFCApplication3.h" #include "MFCApplication3Dlg.h" #include "afxdialogex.h" #ifdef _DEBUG #define new DEBUG_NEW #endif #define WM_UPDATE_RECEIVE_TEXT 120 // 用于应用程序“关于”菜单项的 CAboutDlg 对话框 class CAboutDlg : public CDialogEx { public: CAboutDlg(); // 对话框数据 #ifdef AFX_DESIGN_TIME enum { IDD = IDD_ABOUTBOX }; #endif protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持 // 实现 protected: DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX) { } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialogEx::DoDataExchange(pDX); } BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx) END_MESSAGE_MAP() // CMFCApplication3Dlg 对话框 CMFCApplication3Dlg::CMFCApplication3Dlg(CWnd* pParent /*=nullptr*/) : CDialogEx(IDD_MFCAPPLICATION3_DIALOG, pParent) { m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } // 接收数据 SOCKET receiverSocket; UINT ReceiveThread(LPVOID pParam) { CMFCApplication3Dlg* pDlg = (CMFCApplication3Dlg*)pParam; char buffer[1024]; sockaddr_in senderAddress; int senderAddressSize = sizeof(senderAddress); int receivedBytes; while (true) { receivedBytes = recvfrom(receiverSocket, buffer, sizeof(buffer), 0, (sockaddr*)&senderAddress, &senderAddressSize); if (receivedBytes == SOCKET_ERROR) { std::cout << "接收数据失败" << std::endl; } else { buffer[receivedBytes] = '\0'; // 在主线程中更新UI pDlg->PostMessageW(WM_UPDATE_RECEIVE_TEXT, (WPARAM)buffer, 0); } } return 0; } LRESULT CMFCApplication3Dlg::OnUpdateReceiveText(WPARAM wParam, LPARAM lParam) { // 将字节数据转换为CStringA CStringA strText((LPCSTR)wParam); // 将CStringA转换为CString，并设置到CEdit控件中 m_receive.SetWindowText(CString(strText)); return 0; } void CMFCApplication3Dlg::DoDataExchange(CDataExchange* pDX) { CDialogEx::DoDataExchange(pDX); DDX_Control(pDX, IDC_EDIT1, m_port); DDX_Control(pDX, IDC_EDIT2, m_receive); } BEGIN_MESSAGE_MAP(CMFCApplication3Dlg, CDialogEx) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_MESSAGE(WM_UPDATE_RECEIVE_TEXT, OnUpdateReceiveText) ON_EN_CHANGE(IDC_EDIT1, &CMFCApplication3Dlg::OnEnChangeEdit1) END_MESSAGE_MAP() // CMFCApplication3Dlg 消息处理程序 BOOL CMFCApplication3Dlg::OnInitDialog() { CDialogEx::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 != nullptr) { BOOL bNameValid; CString strAboutMenu; bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX); ASSERT(bNameValid); 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 return TRUE; // 除非将焦点设置到控件，否则返回 TRUE } void CMFCApplication3Dlg::OnSysCommand(UINT nID, LPARAM lParam) { if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialogEx::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 CMFCApplication3Dlg::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); // 使图标在工作区矩形中居中 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 { CDialogEx::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 CMFCApplication3Dlg::OnQueryDragIcon() { return static_cast<HCURSOR>(m_hIcon); } void CMFCApplication3Dlg::OnEnChangeEdit1() { // TODO: 如果该控件是 RICHEDIT 控件，它将不 // 发送此通知，除非重写 CDialogEx::OnInitDialog() // 函数并调用 CRichEditCtrl().SetEventMask()， // 同时将 ENM_CHANGE 标志“或”运算到掩码中。 // TODO: 在此添加控件通知处理程序代码 // 初始化Winsock WSADATA wsaData; if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) { std::cout << "初始化套接字" << std::endl; } // 创建套接字 receiverSocket = socket(AF_INET, SOCK_DGRAM, 0); if (receiverSocket == INVALID_SOCKET) { std::cout << "创建套接字失败" << std::endl; WSACleanup(); } // 绑定监听地址 sockaddr_in receiverAddress; receiverAddress.sin_family = AF_INET; //端口读取 CString portText; m_port.GetWindowText(portText); int portValue = _ttoi(portText); if (portValue == 0) { CString message = L"请输入端口号"; // 警示消息内容 AfxMessageBox(message, MB_ICONWARNING | MB_OK); } receiverAddress.sin_port = htons(portValue); // 设置接收方的监听端口号 receiverAddress.sin_addr.s_addr = INADDR_ANY; if (bind(receiverSocket, (sockaddr*)&receiverAddress, sizeof(receiverAddress)) == SOCKET_ERROR) { std::cout << "绑定套接字失败" << std::endl; closesocket(receiverSocket); WSACleanup(); } AfxBeginThread(ReceiveThread, this); }