MFC 应用程序在添加列表控件元素时卡住

Question

MFC 应用程序在向列表控件中添加元素时卡住，无法单击任何其他按钮，甚至无法在嗅探网络数据包时关闭按钮。

整个代码如下图：

// SnifferSampleDlg.cpp : implementation file
//

#include "stdafx.h"
#include "SnifferSample.h"
#include "SnifferSampleDlg.h"
#include "afxdialogex.h"
#include <Windows.h>
#include <WinSock2.h>
#include <mstcpip.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#endif

#pragma comment(lib,"ws2_32.lib") //For winsock

// CSnifferSampleDlg dialog


//typedef struct ip_hdr
//{
//  unsigned char ip_header_len:4; // 4-bit header length (in 32-bit words) normally=5 (Means 20 Bytes`enter code here` may be 24 also)
//  unsigned char ip_version :4; // 4-bit IPv4 version
//  unsigned char ip_tos; // IP type of service
//  unsigned short ip_total_length; // Total length
//  unsigned short ip_id; // Unique identifier
//
//  unsigned char ip_frag_offset :5; // Fragment offset field
//
//  unsigned char ip_more_fragment :1;
//  unsigned char ip_dont_fragment :1;
//  unsigned char ip_reserved_zero :1;
//
//  unsigned char ip_frag_offset1; //fragment offset
//
//  unsigned char ip_ttl; // Time to live
//  unsigned char ip_protocol; // Protocol(TCP,UDP etc)
//  unsigned short ip_checksum; // IP checksum
//  unsigned int ip_srcaddr; // Source address
//  unsigned int ip_destaddr; //destination address
//} IPV4_HDR;

typedef struct tcp_header
{
    unsigned short source_port; // source port
    unsigned short dest_port; // destination port
    unsigned int sequence; // sequence number - 32 bits
    unsigned int acknowledge; // acknowledgement number - 32 bits

    unsigned char ns :1; //Nonce Sum Flag Added in RFC 3540.
    unsigned char reserved_part1:3; //according to rfc
    unsigned char data_offset:4; /*The number of 32-bit words in the TCP header.
    This indicates where the data begins.
    The length of the TCP header is always a multiple
    of 32 bits.*/

    unsigned char fin :1; //Finish Flag
    unsigned char syn :1; //Synchronise Flag
    unsigned char rst :1; //Reset Flag
    unsigned char psh :1; //Push Flag
    unsigned char ack :1; //Acknowledgement Flag
    unsigned char urg :1; //Urgent Flag

    unsigned char ecn :1; //ECN-Echo Flag
    unsigned char cwr :1; //Congestion Window Reduced Flag

    ////////////////////////////////

    unsigned short window; // window
    unsigned short checksum; // checksum
    unsigned short urgent_pointer; // urgent pointer
} TCP_HDR;

int total = 0,icmp = 0, igmp = 0,tcp = 0 ,udp = 0 ,others = 0;

CSnifferSampleDlg::CSnifferSampleDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CSnifferSampleDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CSnifferSampleDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
    DDX_Control(pDX, IDC_LIST1, m_listCtrl);
}

BEGIN_MESSAGE_MAP(CSnifferSampleDlg, CDialogEx)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON1, &CSnifferSampleDlg::OnBnClickedButton1)
END_MESSAGE_MAP()


// CSnifferSampleDlg message handlers
static void AddData(CListCtrl &ctrl, int row, int col, LPWSTR str)
{
    LVITEM lv;
    lv.iItem = row;
    lv.iSubItem = col;
    lv.pszText =  str;
    lv.mask = LVIF_TEXT;


    if(col == 0)
        ctrl.InsertItem(0,str);
        /*ctrl.RedrawItems(  0,   tcp);*/
    else
        ctrl.SetItem(&lv);  
}

BOOL CSnifferSampleDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    // 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

    m_listCtrl.InsertColumn(0, L"Source");
    m_listCtrl.SetColumnWidth(0, 100);

    m_listCtrl.InsertColumn(1,L"Destination");
    m_listCtrl.SetColumnWidth(1, 100);

    m_listCtrl.InsertColumn(2, L"Protocol");
    m_listCtrl.SetColumnWidth(2, 90);

    m_listCtrl.SendMessage(LVM_SETEXTENDEDLISTVIEWSTYLE, 0,   
    LVS_EX_FULLROWSELECT);

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

// 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 CSnifferSampleDlg::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 CSnifferSampleDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}

int CSnifferSampleDlg::Startbutton()
{
    SOCKET ListenSocket;
    struct sockaddr_in saServer;
    hostent* localHost;
    char* localIP;
    WSADATA wsaData;
    int iResult;
    tcp=0;
    //Initialising Winsock....
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0)
    {
        AfxMessageBox(L"WSAStartup() failed");
        return 1;
    }
    //Creating RAW socket for listening 
    ListenSocket = socket (AF_INET,SOCK_RAW,IPPROTO_IP);

    localHost = gethostbyname("");
    localIP = inet_ntoa (*(struct in_addr *)*localHost->h_addr_list);

    saServer.sin_family = AF_INET;
    saServer.sin_addr.s_addr = inet_addr(localIP);
    saServer.sin_port = htons(5150);

// Bind the listening socket using the
// information in the sockaddr structure
    iResult = bind( ListenSocket,(SOCKADDR*) &saServer, sizeof(saServer) );
    if( iResult != 0){
        AfxMessageBox(L"Binding the address with the socket failed "); 
        return 1;
    }

    AfxMessageBox(L"Binding successful");
    int in_buffer=1, out_buffer;
    if (WSAIoctl(ListenSocket,SIO_RCVALL, &in_buffer,sizeof(in_buffer), 0, 0,(LPDWORD) &out_buffer , 0 , 0) == SOCKET_ERROR)
    {
        AfxMessageBox(L"WSAIoctl() failed...");
        return 1;
    }
    AfxMessageBox(L"Socket Set");
    CString strText;
int nColumnCount = m_listCtrl.GetHeaderCtrl()->GetItemCount();

    StartSniffing(ListenSocket);
    closesocket(ListenSocket);
    WSACleanup();
    return 0;
}
void CSnifferSampleDlg::StartSniffing(SOCKET sniffer){
    char *Buffer = (char *)malloc(65536); 
    int mangobyte;

    if (Buffer == NULL)
    {
        printf("malloc() failed.\n");
        return;
    }

    do
    {
        mangobyte = recvfrom(sniffer , Buffer , 65536 , 0 , 0 , 0);

        if(mangobyte > 0)
        {
            ProcessPacket(Buffer,mangobyte);
            /*if(tcp==50)
                break;*/
        }
        else
        {
            printf( "recvfrom() failed.\n");
        }
    }
    while (mangobyte > 0);

    free(Buffer);
}
void CSnifferSampleDlg::ProcessPacket(char* buffer,int size){
    ip.ValueAssign(buffer);
    ++total;

 //Check the Protocol and do accordingly...
    switch (ip.ip_protocol)
    {
        case 1: //ICMP Protocol
        ++icmp;
        break;

        case 2: //IGMP Protocol
        ++igmp;
        break;

        case 6: //TCP Protocol
        ++tcp;
        ProcessTCPPacket(buffer,size);
        /*if(tcp==50)
            break;*/
        break;

        case 17: //UDP Protocol
        ++udp;
        break;

        default: //Some Other Protocol like ARP etc.
        ++others;
        break;
    }
    printf("TCP : %d UDP : %d ICMP : %d IGMP : %d Others : %d Total : %d\r",tcp,udp,icmp,igmp,others,total);
}
void CSnifferSampleDlg::ProcessTCPPacket(char* buffer,int size){
    unsigned short iphdrlen;
    SOCKADDR_IN source;
    char* source_addr;
    char* destination_addr;

    source.sin_addr.s_addr = ip.ip_srcaddr;
    source_addr=inet_ntoa(source.sin_addr);

    SOCKADDR_IN destination;
    wchar_t source_address[20];
    wchar_t destination_address[20];
    mbstowcs_s(0,source_address,source_addr,strlen(source_addr)+1); //method used to convert char* to LPWSTR
    destination.sin_addr.s_addr = ip.ip_destaddr;
    destination_addr=inet_ntoa(destination.sin_addr);
    mbstowcs_s(0,destination_address,destination_addr,strlen(destination_addr)+1);
    m_listCtrl.InsertColumn(3,L"");
    m_listCtrl.SetColumnWidth(3, 80);
    m_listCtrl.SetRedraw(FALSE);
    AddData(m_listCtrl,0,0,source_address);
    /*AddData(m_listCtrl,0,1,destination_address);
    AddData(m_listCtrl,0,2,L"TCP");*/
    m_listCtrl.SetRedraw(TRUE);
    m_listCtrl.DeleteColumn(3);
}
void CSnifferSampleDlg::OnBnClickedButton1()
{
    Startbutton();
}

即使我使用线程，它也无法正常工作。

数据包嗅探实际上是一个持续的过程，直到按下停止按钮。但是在这个程序中，当嗅探完成后，无法按下其他按钮，应用程序就会卡住。当我将嗅探限制为 20 或 50 时，那么在那么多数据包之后我们只能做任何其他事情。但是将应用程序限制在 20 或 50 个数据包是一个很大的缺点。

Answer 1

首先你一定要把你的基于套接字的数据包侦听器和解析器合并到一个线程中。主线程专用于仅限 GUI 任务。
您需要为列表控件启用虚拟模式。在这种模式下，列表视图控件本身不承载任何数据。它只知道当前应该显示的行。请求实际数据要求。这使您的应用程序负责管理它显示的数据。
了解更多信息：https://msdn.microsoft.com/en-us/library/ye4z8x58.aspx

以下是有关如何使用它的简短示例：

您需要设置列表控件中的项数。即使我们没有添加任何东西，列表也认为它有这个数量的项目：

m_DataArray定义为CArray<CDataItemInfo> m_DataArray；

m_DataListCtrl.SetItemCountEx((int)m_DataArray.GetSize(),
     LVSICF_NOSCROLL|LVSICF_NOINVALIDATEALL);

...

BEGIN_MESSAGE_MAP(CListCtrlTestDlg, CDialog)
    ON_NOTIFY(LVN_GETDISPINFO, IDC_DATA_LIST, OnGetDispInfoList)
END_MESSAGE_MAP()

void CListCtrlTestDlg::OnGetDispInfoList(NMHDR* pNMHDR, LRESULT* pResult) 
{
    NMLVDISPINFO *pDispInfo = reinterpret_cast<NMLVDISPINFO*>(pNMHDR);

    LV_ITEM& LstItem = pDispInfo->item;

    int nItem = LstItem.iItem;

    if(nItem > m_DataArray.GetSize()-1)
        return; 

    const CDataItemInfo& ItemData = m_DataArray[nItem];

    if (LstItem.mask & LVIF_TEXT) 
    {
        //Copy the text to the LV_ITEM structure
        //Maximum number of characters is in LstItem.cchTextMax
        lstrcpyn(LstItem.pszText, ItemData.GetColumnText(LstItem.iSubItem), LstItem.cchTextMax);
    }

}

MFC 应用程序在添加列表控件元素时卡住

MFC Application getting stuck when adding list control elements

c++

mfc

clistctrl

visual-c++