VS 2022中能运行代码，但没有反应结果

Question

请问一下，代码可以运行，但显示不出来结果，入下方图片，请问怎么解决

#include<Winsock2.h>
#pragma comment(lib, "Ws2_32.lib")      //使用ntohs()函数,转换2B/4B的数据
#pragma comment(lib, "wpcap.lib")
#include"pcap.h"                        //需要另外导入，具体步骤见Winpcap使用说明
#include<fstream>
#include<iostream>                      //格式化输出
#include<iomanip>
using namespace std;             
#include<conio.h>                       //使用_getch()
struct arppkt {
    unsigned short hdtyp;              //硬件地址
    unsigned short protyp;             //协议类型
    unsigned char hdsize;              //硬件地址长度
    unsigned char prosize;             //协议地址长度
    unsigned short op;                 //操作值
    u_char smac[6];                    //源MAC地址
    u_char sip[4];                     //源IP地址
    u_char dmac[6];                    //目的MAC地址
    u_char dip[4];                     //目的IP地址
};
//自定义处理包函数
//pcap_pkthdr是winpcap加入的
//pkt_data表示MAC帧的起始位置
//out是输入流
void packet_handler(const pcap_pkthdr* header, const u_char* pkt_data, ostream&);
void main(int argc, char* argv[])
{
    if (argc != 2)
    {
        cout << "usage:ARPCap logfilename" << endl;
        cout << "press anykey to continue." << endl;     //参数不对，进行提示
        _getch();
        return;
    }
    pcap_if_t* alldevs;                               //网络设备结构
    pcap_if_t* d;
    pcap_t* adhandle;
    char errbuf[PCAP_ERRBUF_SIZE];                  //错误信息
    u_int netmask;                                    //子网掩码
    char packet_filter[] = "ether proto \\arp";       //过滤,选择ARP协议
    struct bpf_program fcode;
    struct pcap_pkthdr* header;
    const u_char* pkt_data;
    //获取网络设备列表
    if (pcap_findalldevs(&alldevs, errbuf) == -1)
    {
        cout << "Error in pcap_findalldevs:" << errbuf;
        return;
    }
    //选择一个Ethernetka卡
    for (d = alldevs; d; d = d->next)
    {
        //以混杂模式打开网卡,接受所有的帧
        if ((adhandle = pcap_open_live(d->name, 1000, 1, 300, errbuf)) == NULL)
        {
            cout << "\nUnable to open the adapter.";
            pcap_freealldevs(alldevs);              //释放设备列表      
            return;
        }
        if (pcap_datalink(adhandle) == DLT_EN10MB && d->addresses != NULL)
            break;
    }
    if (d == NULL)
    {
        cout << "\nNO interfaces found! Make sure winpcap is installed.\n";
        return;
    }
    //获得子网掩码
    netmask = ((sockaddr_in*)(d->addresses->netmask))->sin_addr.S_un.S_addr;
    //调试过滤器，只捕获ARP包
    if (pcap_compile(adhandle, &fcode, packet_filter, 1, netmask) < 0)
    {
        cout << "\nUnable to compile the packet filter. Check the syntax.\n";
        pcap_freealldevs(alldevs);
        return;
    }
    //设置过滤器
    if (pcap_setfilter(adhandle, &fcode) < 0)
    {
        cout << "\nError setting the filter.\n";
        pcap_freealldevs(alldevs);
        return;
    }
    cout << "\t\tlistening on " << d->description << "..." << endl << endl;
    ofstream fout(argv[1], ios::app);                  //日志记录文件
    //加入日期记录
    time_t t;
    time(&t);
    fout.seekp(0, ios::end);
    if (fout.tellp() != 0)
        fout << endl;
    fout << "\t\tARP request(1)/replay(2) on " << ctime(&t);
    cout << "sour IP Addr" << "   " << "Sour MAC Address"
        << "   " << "Des IP Addr" << "   " << "Des MAC Address"
        << "   " << "OP" << "   " << "Time" << endl;
    fout << "Sour IP Addr" << "  " << "Sour MAC Address"
        << "  " << "Des IP Addr" << "  " << "Des MAC Address"
        << "  " << "OP" << "  " << "Time" << endl;
    //释放设备列表
    pcap_freealldevs(alldevs);
    //开始捕获MAC帧
    int result;                                 //时间到返回结果
    while ((result = pcap_next_ex(adhandle, &header, &pkt_data)) >= 0)
    {
        if (result == 0)
            continue;
        packet_handler(header, pkt_data, cout);   //解析ARP包，输出结果
        packet_handler(header, pkt_data, fout);   //输出到文件
    }
}
void packet_handler(const pcap_pkthdr* header, const u_char* pkt_data, ostream& out)
{
    int i;
    //从截获的数据帧中找到arp包头的位置
    arppkt* arph = (arppkt*)(pkt_data + 14);    //14为Ethernet帧头的长度
    //输出源IP地址
    for (i = 0; i < 3; i++)
        out << int(arph->sip[i]) << '.';
    out.setf(ios::left);
    out << setw(3) << int(arph->sip[3]) << "  ";
    out.unsetf(ios::left);
    //输出源MAC地址
    char oldfillchar = out.fill('0');
    out.setf(ios::uppercase);       //MAC地址以分开'-'的大写字符表示
    for (i = 0; i < 5; i++)
        out << hex << setw(2) << int(arph->smac[i]) << '_';
    out << hex << setw(2) << int(arph->smac[5]) << "  ";
    out.fill(oldfillchar);
    //输出目的的IP地址
    out.unsetf(ios::hex | ios::uppercase);
    for (i = 0; i < 3; i++)
        out << int(arph->dip[i]) << '.';
    out.setf(ios::left);
    out << setw(3) << int(arph->dip[3]) << " ";
    out.unsetf(ios::left);
    //输出目的MAC地址
    out.fill('0');
    out.setf(ios::uppercase);
    for (i = 0; i < 5; i++)
        out << hex << setw(2) << int(arph->dmac[i]) << '_';
    out << hex << setw(2) << int(arph->dmac[5]) << "  ";
    out.fill(oldfillchar);
    out.unsetf(ios::hex | ios::uppercase);
    out << ntohs(arph->op) << " ";                
out.fill(oldfillchar);
    out.unsetf(ios::hex | ios::uppercase);
    out << ntohs(arph->op) << " ";                  //输出的操作类型,注意网络字节间的转换
    struct tm* ltime;                              //时间
    ltime = localtime(&header->ts.tv_sec);
    out.fill('0');
    out << ltime->tm_hour << ':' << setw(2) << ltime->tm_min << ':' << setw(2) << ltime->tm_sec;
    out.fill(oldfillchar);
    out << endl;
}

Answer 1

if (argc != 2)
    {
        cout << "usage:ARPCap logfilename" << endl;
        cout << "press anykey to continue." << endl;     //参数不对，进行提示
        _getch();
        return;
    }

程序参数不对，调试设置里设置程序启动参数。