这是以先代码；
Cstring DevList;
void ICWinPcap::GetDevList()
{
    pcap_if_t *alldevs;
    pcap_if_t *d;
    int i=0;
    char errbuf[PCAP_ERRBUF_SIZE];
   
    /* Retrieve the device list from the local machine */
    if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL /* auth is not needed */, &alldevs, errbuf) == -1)
    {
       // fprintf(stderr,"", );
        DevList.Empty();
        DevList.Format(_T("Error in pcap_findalldevs_ex: %s"),errbuf);
        CDlg->m_DevList.InsertString(-1,DevList);//m_DevList是listbox控件。
        exit(1);
    }
   
    /* Print the list */
    for(d= alldevs; d != NULL; d= d->next)
    {
        //printf("%d. %s", ++i, d->name);
        DevList.Empty();
        DevList.AppendFormat(_T("%d、 %s\n"), ++i, (d->name));
        CDlg->m_DevList.InsertString(-1,DevList);
        //CDlg->m_IP.set
        DevList.Empty();
       if (d->description)
           DevList.AppendFormat(_T("(%s)\n"), d->description);
        else
            DevList.AppendFormat(_T("(No description available)\n"));
       CDlg->m_DevList.InsertString(-1,DevList);
    }
   
    if (i == 0)
    {
       // printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
        return;
    }

    /* We don't need any more the device list. Free it */
    pcap_freealldevs(alldevs);
}