1.下載安裝 npcap-1.60.exe

2. 下載 npcap-sdk-1.12

3. VC++ 工程設定中，加入標頭檔案和lib檔案的路徑。 方便起見，字符集選Multi-Byte

4. 把SDK中的例程式複製貼上變成自己的測試程式。

程式介面如下：

程式如下：抓包的程式段放在一個執行緒中，避免阻塞操作介面。

// CAPTest.cpp : Defines the entry point for the application.
// 用NPCAP抓包
// XGZ 2022-5-13 SZ

#include "stdafx.h"
#include "CAPTest.h"
#include 
 
"process.h"
#include "time.h"

#include <pcap.h>

#pragma comment(lib, "Packet.lib")
#pragma comment(lib, "wpcap.lib")

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                    // The title bar text
 

TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);

 
//XGZ
#define IDC_COMBOADAPT            1001
#define IDC_BUTTONSTART            1002
#define IDC_EDIT                            1003 

HWND hWndComboAdapt;
HWND hWndButtonStart;
HWND hWndEdit;

pcap_t *adhandle = NULL;
pcap_if_t *alldevs;
pcap_if_t *d;
int inum;
char errbuf[PCAP_ERRBUF_SIZE];
struct pcap_pkthdr *header;
const u_char *pkt_data;
time_t local_tv_sec;
struct tm *ltime;
char timestr[16];
int res;
int iStart = 0;

int PRINT(TCHAR *fmt, ...);
VOID ThreadProc1(PVOID pData);

int OnCreate(HWND, UINT, WPARAM, LPARAM);
int OnPaint(HWND, UINT, WPARAM, LPARAM);
int OnSize(HWND, UINT, WPARAM, LPARAM);
int OnDestroy(HWND, UINT, WPARAM, LPARAM);
int OnButtonStart(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

     // TODO: Place code here.
    MSG msg;
    HACCEL hAccelTable;

    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_CAPTEST, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_CAPTEST));

    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style            = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra        = 0;
    wcex.cbWndExtra        = 0;
    wcex.hInstance        = hInstance;
    wcex.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_CAPTEST));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName    = MAKEINTRESOURCE(IDC_CAPTEST);
    wcex.lpszClassName    = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    
    switch (message)
    {
    case WM_CREATE:
        OnCreate(hWnd, message, wParam, lParam);
        break;
    case WM_SIZE:
        OnSize(hWnd, message, wParam, lParam);
        break;
    case WM_PAINT:
        OnPaint(hWnd, message, wParam, lParam);
        break;
    case WM_DESTROY:
        OnDestroy(hWnd, message, wParam, lParam);
        break;
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
        case IDC_BUTTONSTART:
            OnButtonStart(hWnd, message, wParam, lParam);
            break;
        case IDM_ABOUT:
            MessageBox(hWnd, _T("CAPTest"),_T("MBox"),MB_OK);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

int OnCreate(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int i=0;

    TCHAR strBuf[1024];
    hWndEdit = CreateWindow(TEXT("edit"),NULL,
        WS_CHILD|WS_BORDER|WS_VISIBLE|ES_MULTILINE|WS_VSCROLL,
        10,130,600,400,
        hWnd, (HMENU) IDC_EDIT, hInst, NULL);

    hWndButtonStart = CreateWindow(TEXT("button"), TEXT("START"),
        WS_CHILD|WS_BORDER|WS_VISIBLE,
        100, 40, 80, 25,
        hWnd, (HMENU)IDC_BUTTONSTART, hInst, NULL);

    hWndComboAdapt = CreateWindow(_T("combobox"), NULL,
        WS_CHILD|WS_BORDER|WS_VISIBLE|LBS_STANDARD,
        10, 10, 600, 250,
        hWnd, (HMENU)IDC_COMBOADAPT, hInst, NULL);

    if(SetDllDirectory(_T("C:\\Windows\\System32\\Npcap")) == 0)
    {
        return -1;
    }

    if(pcap_findalldevs(&alldevs, errbuf) == -1)
    {
        return -1;
    }

    for(d=alldevs; d; d=d->next)
    {
        if (d->description)
        {
            wsprintf(strBuf,  _T("%d. %s  (%s)"), ++i, d->name, d->description);
            SendMessage(hWndComboAdapt, CB_ADDSTRING, (WPARAM)0, (LPARAM)(LPCTSTR)strBuf);
            PRINT(strBuf);PRINT(_T("\r\n"));
        }
        else
        {
            wsprintf(strBuf,  _T("%d. %s  (%s)"), ++i, d->name, _T(" (No description available)"));
            SendMessage(hWndComboAdapt, CB_ADDSTRING, (WPARAM)0, (LPARAM)(LPCTSTR)strBuf);
            PRINT(strBuf);PRINT(_T("\r\n"));
        }
    }
    SendMessage(hWndComboAdapt, CB_SETCURSEL , 4, 0L);

    return 1;
}

int OnSize(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int cxClient,cyClient;

    cxClient = LOWORD (lParam);
    cyClient = HIWORD (lParam);

    MoveWindow(hWndComboAdapt, 5, 5, cxClient-10, 250, TRUE);
    MoveWindow(hWndButtonStart, cxClient-150, 40, 100, 30, TRUE);
    MoveWindow(hWndEdit, 5, 80, cxClient-10, cyClient-90, TRUE);

    return DefWindowProc(hWnd, message, wParam, lParam);

}

int OnPaint(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    RECT rt;

    hdc = BeginPaint(hWnd, &ps);
    GetClientRect(hWnd, &rt);
    
    EndPaint(hWnd, &ps);

    return 1;
}

int OnDestroy(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    if(1==iStart)
    {
        iStart =0;
        MessageBox(hWnd, _T("STOP and EXIT."),_T("MBox"),MB_OK);  //for some time to exit.
    }

    if(adhandle)
    {
        pcap_close(adhandle);
        adhandle = NULL;
    }
    pcap_freealldevs(alldevs);
    
    PostQuitMessage(0);
    return 1;
}

int OnButtonStart(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int i;

    if(0==iStart)
    {
        iStart = 1;
        SetWindowText(hWndButtonStart, _T("STOP"));
        inum = (int)SendMessage(hWndComboAdapt, CB_GETCURSEL , 0, 0L);
        inum++;
        PRINT(_T("\r\n Select iNum=%d"),inum);
        for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
        if(adhandle)
        {
            pcap_close(adhandle);
            adhandle = NULL;
        }

        if ((adhandle= pcap_open_live(d->name,    // name of the device
            65536,            // portion of the packet to capture. 
            // 65536 grants that the whole packet will be captured on all the MACs.
            1,                // promiscuous mode (nonzero means promiscuous)
            1000,            // read timeout
            errbuf            // error buffer
            )) == NULL)
        {
            fprintf(stderr,"\nUnable to open the adapter. %s is not supported by Npcap\n", d->name);
            /* Free the device list */
            //pcap_freealldevs(alldevs);
            return -1;
        }
        PRINT(_T("\nlistening on %s...\n"), d->description);
        _beginthread(ThreadProc1, 0, NULL);
    
    }
    else
    {
        iStart = 0;
        SetWindowText(hWndButtonStart, _T("START"));
    }
    
    return 1;
}

VOID ThreadProc1(PVOID pData)
{
    PRINT(_T("\r\n  ThreadProc1 Begin.."));
    
    while((res = pcap_next_ex( adhandle, &header, &pkt_data)) >= 0)
    {
        if(0== iStart) break;
        if(res == 0)
            /* Timeout elapsed */
            continue;

        /* convert the timestamp to readable format */
        local_tv_sec = header->ts.tv_sec;
        ltime=localtime(&local_tv_sec);
        strftime( timestr, sizeof timestr, "%H:%M:%S", ltime);
            
        PRINT(_T("%s,%.6d len:%d \t[%2X %2X %2X %2X %2X %2X <- %2X %2X %2X %2X %2X %2X] \r\n"),
        timestr, header->ts.tv_usec, header->len,
        *pkt_data,*(pkt_data+1),*(pkt_data+2),*(pkt_data+3),*(pkt_data+4),*(pkt_data+5),
        *(pkt_data+6),*(pkt_data+7),*(pkt_data+8),*(pkt_data+9),*(pkt_data+10),*(pkt_data+11));
    }

    if(res == -1)
    {
        PRINT(_T("Error reading the packets: %s\n"), pcap_geterr(adhandle));
    }
    
    PRINT(_T("\r\n  ThreadProc1 Exit."));
    pcap_close(adhandle);
    adhandle = NULL;
    _endthread();
}

TCHAR buffer[1024];
int PRINT(TCHAR *fmt, ...)
{
    va_list argptr;
    int cnt;

    int iEditTextLength;
    HWND hWnd;

    if(NULL == hWndEdit) return 0; 

    va_start(argptr, fmt);
    cnt = vsprintf(buffer, fmt, argptr);
    va_end(argptr);

    iEditTextLength = GetWindowTextLength(hWndEdit);
    if(iEditTextLength + cnt > 30000)       // edit text max length is 30000
    {
        SendMessage(hWndEdit, EM_SETSEL, 0, 10000);
        SendMessage(hWndEdit, WM_CLEAR, 0, 0);
        iEditTextLength = iEditTextLength - 10000;
    }
    SendMessage(hWndEdit, EM_SETSEL, iEditTextLength, iEditTextLength);
    SendMessage(hWndEdit, EM_REPLACESEL,0, (LPARAM) buffer);

    return(cnt);        
}