I�m using the program below, running as Win32 console application. The
WinPcap version is 3.1 beta4 (packet.dll version 3.1.0.24) running on
Win2000, SP4. (For clarity, I have removed all stuff not related to
WinPcap.)
The program runs fine when running stand-alone. However, when running under
the Visual Studio.NET 2003 debugger, the call to pcap_findalldevs_ex causes
an error "Unhandled exception at 0x6a55ac84: 0xC0000005: Access violation
reading location 0x6a55ac84." This happens whenever a breakpoint is set
anywhere before the call to pcap_findalldevs_ex. When no breakpoint is set,
the program runs ok.
I have seen some similar problems reportd in older threads, but I have not
found any solution. Does anybody have a clue?
Bernard
int _tmain(int argc, _TCHAR* argv[])
{
pcap_if_t *alldevs;
pcap_if_t *xcpdev;
char errbuf[PCAP_ERRBUF_SIZE+1];
u_char packet[1500];
int i;
printf("Starting _tmain\n");
/* Retrieve the interfaces list */
if (pcap_findalldevs_ex("rpcap://", NULL, &alldevs, errbuf) == -1)
{
fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n",errbuf);
exit(1);
}
/* Scan the list printing every entry */
for(xcpdev=alldevs;xcpdev;xcpdev=xcpdev->next)
{
pcap_addr_t *a = xcpdev->addresses;
if (a && a->addr)
{
if (((struct sockaddr_in *)a->addr)->sin_addr.s_addr == 0x02B2A8C0)
{
printf("\tDescription: %s\n",xcpdev->description);
break;
}
}
}
if (!xcpdev)
{
printf("Not found adapter with IP address 192.168.178.2\n");
return 2;
}
/* Open the output device */
if ( (fp= pcap_open(xcpdev->name, // name of the device
100, // portion of the packet to
capture (only the first 100 bytes)
PCAP_OPENFLAG_PROMISCUOUS, // promiscuous mode
1000, // read timeout
NULL, // authentication on the remote
machine
errbuf // error buffer
) ) == NULL)
{
fprintf(stderr,"\nUnable to open the adapter. %s is not supported by
WinPcap\n", argv[1]);
return -2;
}
/* ... do dome receive and transmit here ... */
}
--
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