[Winpcap-users] Problem linking to wpcap.lib

[Gianluca Varenni]

The user level part of WinPcap (wpcap.dll and packet.dll, plus a couple other minor binaries) are 32-bit only. We do not provide 64-bit user level libraries because up to now there was not much request for that.

Wrt how WinPcap works on 64bit, this is the explanation. The kernel driver (npf.sys) is 64bit. This is a requirement (kernel drivers must be 64bit on a 64bit Windows OS). The user level part is 32bit, i.e. a WinPcap-based application is always a 32-bit application. On 64bit Windows, it runs on WoW64 (Windows on Windows64) i.e. it runs in a 32bit environment, and the OS provides the necessary thunking to have the 32bit application to communicate with the 64bit kernel and 64bit kernel driver.

Providing 64bit versions of the WinPcap user level libraries is definitely in our todo list, but at the moment it's a low priority task due to the very few requests we had for this feature.

Have a nice day
GV

  ----- Original Message ----- 
  From: Aviad Yehezkel 
  To: winpcap-users at winpcap.org 
  Sent: Thursday, November 22, 2007 10:46 AM
  Subject: [Winpcap-users] Problem linking to wpcap.lib


  I need help in compiling my program.
  i installed winpcap driver + dll (the exe file) on 64 bit machine.
  i wrote a program that using pcap functions. when i am compling it in 64 bit mode i get an unsloved link symbol to the pcap functions, but when i am compling it in 32 bit mode, everything is working fine. i think the wpcap.lib from the developer pack is for 32 bit, but i can't understand why it is working on 64 bit machine? - didn't the installation of winpcap install a dll of 64 bit?
  please help..



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