类似于 Visual Studio 中的 jquery .on()

Posted 2023-02-22

【中文标题】类似于 Visual Studio 中的 jquery .on()

【英文标题】：something like jquery .on() in visual studio

【发布时间】：2015-01-04 20:46:48

【问题描述】：

我当然想要一些代码，如 Visual Studio 和 C++ 中的 .on() 或 .live() jquery 函数。当用户按下或向上键时，该功能应该起作用。

它是 Visual Studio 上的 MFC 项目。我必须做什么？谢谢。

这是整个代码：

// MFCApplication5Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "MFCApplication5.h"
#include "MFCApplication5Dlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialogEx

public:
    CAboutDlg();

// Dialog Data
    enum  IDD = IDD_ABOUTBOX ;

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
    DECLARE_MESSAGE_MAP()
;

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)



void CAboutDlg::DoDataExchange(CDataExchange* pDX)

    CDialogEx::DoDataExchange(pDX);


BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CMFCApplication5Dlg dialog



CMFCApplication5Dlg::CMFCApplication5Dlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CMFCApplication5Dlg::IDD, pParent)
    , oneo(0)
    , twoo(0)
    , threeo(0)
    , fouro(0)
    , fiveo(0)
    , sixo(0)
    , seveno(0)
    , eighto(0)
    , nineo(0)
    //, listo(_T(""))

    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);


void CMFCApplication5Dlg::DoDataExchange(CDataExchange* pDX)

    CDialogEx::DoDataExchange(pDX);
    DDX_Text(pDX, IDC_EDIT1, oneo);
    DDX_Text(pDX, IDC_EDIT2, twoo);
    DDX_Text(pDX, IDC_EDIT3, threeo);
    DDX_Text(pDX, IDC_EDIT4, fouro);
    DDX_Text(pDX, IDC_EDIT5, fiveo);
    DDX_Text(pDX, IDC_EDIT6, sixo);
    DDX_Text(pDX, IDC_EDIT7, seveno);
    DDX_Text(pDX, IDC_EDIT8, eighto);
    DDX_Text(pDX, IDC_EDIT9, nineo);
    //DDX_Text(pDX, IDC_EDIT10, listo);


BEGIN_MESSAGE_MAP(CMFCApplication5Dlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON1, &CMFCApplication5Dlg::OnBnClickedButton1)
    ON_WM_KEYDOWN()
    ON_WM_KEYDOWN()
END_MESSAGE_MAP()


// CMFCApplication5Dlg message handlers

BOOL CMFCApplication5Dlg::OnInitDialog()

    CDialogEx::OnInitDialog();

    // Add "About..." menu item to system menu.

    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);

    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    
        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);
        
    

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);         // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here

    return TRUE;  // return TRUE  unless you set the focus to a control


void CMFCApplication5Dlg::OnSysCommand(UINT nID, LPARAM lParam)

    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    
    else
    
        CDialogEx::OnSysCommand(nID, lParam);
    


// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMFCApplication5Dlg::OnPaint()

    if (IsIconic())
    
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // Center icon in client rectangle
        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;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    
    else
    
        CDialogEx::OnPaint();
    


// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMFCApplication5Dlg::OnQueryDragIcon()

    return static_cast<HCURSOR>(m_hIcon);


void DD() 

        MessageBoxA(NULL, "hgh", "Result", MB_ICONINFORMATION);
    //listo = listo + msg;

    //return CDialogEx::PreTranslateMessage(pMsg);


void CMFCApplication5Dlg::OnBnClickedButton1()

    UpdateData(true);

    int randNum;
    int myarray[9];

    bool find;
    int index = 0;


    for (int i = 0; i <9; i++)
        find = false;
        randNum = rand() % 9 + 1;
        for (int j = 0; j < 9; j++) 
            if (randNum == myarray[j]) 
                find = true;
                i--;
                break;
            
        
        if (!find) 
            myarray[index] = randNum;
            //CString msg;
            //msg.Format(_T("index : %d -> random number is : %d \r\n"), index, randNum);
            //listo = listo + msg;
            switch (index) 
            case 0:
                oneo = myarray[index];
                break;
            case 1:
                twoo = myarray[index];
                break;
            case 2:
                threeo = myarray[index];
                break;
            case 3:
                fouro = myarray[index];
                break;
            case 4:
                fiveo = myarray[index];
                break;
            case 5:
                sixo = myarray[index];
                break;
            case 6:
                seveno = myarray[index];
                break;
            case 7:
                eighto = myarray[index];
                break;
            case 8:
                nineo = myarray[index];
                break;
            
            index++;
        
    




    UpdateData(false);



void CMFCApplication5Dlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)

    // TODO: Add your message handler code here and/or call default
    DD();
    CDialogEx::OnKeyDown(nChar, nRepCnt, nFlags);

这是图片： http://i.stack.imgur.com/Y4zNA.jpg

【参考方案1】：

基本机制描述here，例如，您可以为任何MFC CWnd对象实现此方法以传递按键事件：

CWnd::OnKeyDown

MFC 中事件处理的一般机制是消息映射，详细信息在这里：MFC Message Maps。

例如，您可以通过使用 event handler wizard 添加事件（例如 WM_KEYDOWN）来添加处理程序

【讨论】：

我能解释一下如何使用 CWnd::OnKeyDown 吗？我使用消息创建一个处理程序，VS 创建一个像这样的函数void CMFCApplication5Dlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) // TODO: Add your message handler code here and/or call default CDialogEx::OnKeyDown(nChar, nRepCnt, nFlags); “。好的，现在我必须做什么？

根据为您生成的代码，将注释的“TODO”行替换为您希望对 WM_KEYDOWN 事件执行的任何操作。您可以查看 MSDN 网站上的 MFC 示例以获取示例代码。

两个问题：1-没有定义按下哪个键，然后运行该功能，2-使用此代码没有任何反应。当我按下键或其他所有键时，什么也没有发生。

对于基于 CDialog 的应用程序，处理 KeyDown 有点不同。有关详细信息，请参阅***.com/questions/4699148/…（OnKeyDown 将适用于传统 MFC 应用程序）