[Winpcap-users] Access violation when using pcap_findalldevs_ex

bsalibrici at scidyn.com bsalibrici at scidyn.com
Tue Jul 21 06:52:04 PDT 2009

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	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 ...WpdPackExamples-pcapbasic_dump). The only

	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

	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

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

	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
	                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:WINDOWSsystem32npp 
	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

	Perhaps I'm overlooking something simple. 

	Thanks in advance for any help. 
	    --Bill Salibrici
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