[Winpcap-users] Access violation when using pcap_findalldevs_ex

Gianluca Varenni gianluca.varenni at cacetech.com
Tue Jul 21 08:44:23 PDT 2009

Does the same problem happen with WinPcap 4.1beta5?

Can you send me the output of "windump -D"?

Have a nice day
  ----- Original Message ----- 
  From: bsalibrici at scidyn.com 
  To: winpcap-users at winpcap.org 
  Sent: Tuesday, July 21, 2009 6:52 AM
  Subject: [Winpcap-users] Access violation when using pcap_findalldevs_ex

  Hello Everyone,


  I am using WinXP Professional SP3 and Microsoft Visual Studio 6.0 with SP5.

  I installed Winpcap version 4.0.2.


   I also got the WpdPack and compiled your 

  basic_dump example (in ...\WpdPack\Examples-pcap\basic_dump). The only thing

  I had to add to the visual c++ project was the IPHlpApi.Lib (6/16/1999 12:44 PM). 

  When I try to execute the app out of the debugger, it crashes

  at the call to pcap_findalldevs. I verified that the npf driver was running

  before I ran the app - and it was. Here is the error:


                  Unhandled exception in basic_dump.exe (NDISNPP.DLL): 0xC0000005: Access Violation. 


                  Call Stack: NDISNPP! 5a704d91()



  I searched your FAQs and your winpcap-users mailing list archives for this

  or similar problem. The only thing I found was a post back in August 2008

  where В. Rasta posted a similar problem. However, I didn't see a response

  or a resolution??


  Interestingly enough, I downloaded windump 3.9.5 and ran it with the -D option. 

  It listed all my adapters ok, and I selected an adapter with the -i option and it 

  captured packets ok. Here are the results I got for the -h option:


                  windump version 3.9.5, based on tcpdump version 3.9.5


                  WinPcap version 4.0.2 (packet.dll version, based on libpcap version 0.9.5



  Here is some info for the NDISNPP.DLL I'm using:


  File Version: 5.1.2600.5512


  File Date: 4/13/08 8:12 PM


  File Size: 57,344 bytes


  File Location: C:\WINDOWS\system32\npp



  Attached is a screen shot of the debugger display for the crash.


  Any ideas as to what the problem is here with the basic_dump example?

  Perhaps I'm overlooking something simple.

  Thanks in advance for any help.




      --Bill Salibrici


  Winpcap-users mailing list
  Winpcap-users at winpcap.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.winpcap.org/pipermail/winpcap-users/attachments/20090721/3c5c69fd/attachment.htm 

More information about the Winpcap-users mailing list