[Winpcap-users] why pcap_findalldevs run about 30 seconds

[工商银行]

I set DependOnService npf and nm service followed your suggestion.
It still wait about 30 seconds,
My  log info followed:
2007-12-11 08:56:25   Power on my computer,Windows start,
2007-12-11 08:56:41   Windows XP Display login dialog and enter my password
to login in
2007-12-11 08:56:46   start my network authorized program......
2007-12-11 08:56:46   look up used network card......
2007-12-11 08:57:16   Use Network card:Intel(R) PRO/1000 MT Network
Connection (Microsoft's Packet Scheduler)
2007-12-11 08:57:16   send EAPOL_START packet
2007-12-11 08:57:17   receive server message
2007-12-11 08:57:18   already authorized,Through DHCP get ip address and
enter into the corparation local network.
Can I speed up npf and nm service ?
Or set to start these service after windows display login dialog as fast as
possible?

Thank you!


2007/12/10, Bryan Kadzban <bryan at kadzban.is-a-geek.net>:
>
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> 工商银行 wrote:
> > I found that  the pcap_findalldevs function consume about 34 seconds.
> > My question is how long does the winpcap driver loaded ?
>
> The driver loads in a few milliseconds, usually.
>
> > Does it loaded earlier than the network interface loaded?
>
> If it does load before the network card does, winpcap handles the
> dynamic addition of the card.  As long as your program does a
> pcap_findalldevs* after that new card is present, and you're using a
> new-enough winpcap (4.0 should be fine), that will work fine.  (It also
> won't cause an extra delay.)
>
> > My program is put into the windows system service.auto started.
>
> Oh, you're writing a service.  Well that's different then.  I'm guessing
> that you're calling pcap_findalldevs in either ServiceMain or in your
> service's START control handler?  Whenever you make your first winpcap
> driver call (and pcap_findalldevs is one of those), the DLL tries to
> start the "npf" driver.  But if the service control manager is in the
> middle of starting your service, it won't go start another one.  (The
> winpcap DLL also used to require the "nm" service to be running; I don't
> know if this is true anymore, but I believe it still is.)
>
> What you need to do is use service dependencies to make the service
> control manager start the "npf" and "nm" services *before* it starts
> yours.  When you call the API that installs your service, there should
> be a parameter for dependencies (or you can add a REG_MULTI_SZ named
> "DependOnService" to your service's registry key, but you have to reboot
> for that to take effect).  Add both "npf" and "nm" as dependencies.
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