[Winpcap-users] Cannot get Packet.dll to load onr Vista

Tue Aug 18 11:12:41 PDT 2009

  ----- Original Message ----- 
  From: Dennis Drew 
  To: winpcap-users at winpcap.org 
  Sent: Monday, August 17, 2009 2:36 PM
  Subject: Re: [Winpcap-users] Cannot get Packet.dll to load onr Vista

  GV, on this (below), you were right! and that fixed the problem! A pix of the little test app is attached.

  The 64bit one goes to windows\system32
  The 32bit one goes to windows\sysWOW64

  How stupid to have to put a 32 bit dll in a directory that says "64" and a 64 bit one in a directory titles "32"...

The reason behind that is backwards compatibility. Applications expect the system files to be under system32. This is particularly true for 32bit applications that get recompiled for x86-64. So Microsoft came out with this "hack", which makes application development really easy, but it's a headache when you develop installers that deal with both x86 and x86_64 binaries....

GV

  You are a GENIUS! Thanks!

  Dennis
    ----- Original Message ----- 
    From: Dennis Drew 
    To: winpcap-users at winpcap.org 
    Sent: Monday, August 17, 2009 10:23 AM
    Subject: Re: [Winpcap-users] Cannot get Packet.dll to load onr Vista

    GV, I want to make some minor changes in the Packet code. That is why I want to recompile it. This is an open source project and folks just should be able to try things out right? I have timing/synchronization  issues on a high performance system and I am curious about what is going on at this low level. I have put in some callbacks in packet that are made during the spinning to wait between packets sent to let me know what is going on. Basically I am using a Quad core system that has different processes running on different cores. I am trying to see what each core is up to at any one time. These low lever routines are being used by several upper level applications. If one thread (above) is being stalled then I am wondering if another stack of packets could be sent. This is not the whole story but it is what I am exploring. It should be ok to experiment with this project, right?

  Definitely. I was just asking because compiling WinPcap (actually installing it) is a major pain in the neck, and I thought you were just trying to build a WinPcap based application. To simplify your job, when you are experimenting you can safely keep packet.dll and wpcap.dll in the same folder where you have your application (that's what I do during development).

    Now my experimental code is working just fine on XP single core cpu. Now I have mover over to my Qud core Vista 64 bit machine changing nothing and Vista will only see the original Packet dll you released on December 23 2008 at 8:36 AM.

    By the way, below you said:

    The 64bit one goes to windows\system32
    The 32bit one goes to windows\sysWOW64

    Is this not in reverse?

  No, it's right (and I know it sounds wrong...). It's done in such way for backwards compatibility...

    I am using Windows Explorer to copy the files and it lets me see both directories without redirection just fine. I am not recreating the installer, just copying the files from the build directory (...\winpcap\packetNtx\Dll\Project\Debug\x86-x64) to the respective System 32 / WOW areas. The ones the installer put there will load and run but exactly named equivalents built on the same system cannot be seen/loaded. Totally strange. I am using Visual Studio 2005 on both the XP box and the Vista box.

  Usually the problem is when you put the wrong packet.dll in a folder (e.g. you wrongly put the x64 build in sysWOW64).

    Sure wish we had a type of forum where one could include/attach jpg screen shots. 

  If you want you can attach small (jpg) images to the emails. There is no problem in that.

  GV

    Dennis

----------------------------------------------------------------------------
    From: Gianluca Varenni <gianluca.varenni at cacetech.com>
    To: winpcap-users at winpcap.org
    Sent: Monday, August 17, 2009 9:38:08 AM
    Subject: Re: [Winpcap-users] Cannot get Packet.dll to load onr Vista

    Things get complicated on a 64 bit machine. First of all, there are two versions of packet.dll (as of 4.1beta5), the 32bit one and the 64 bit one.

    The 64bit one goes to windows\system32
    The 32bit one goes to windows\sysWOW64

    Moreover, if the application that you use to copy the files is 32bit (e.g. you use total commander), then things get more complicated. The *real* windows\system32 folder is hidden. If you try to open a file in windows\system32, the OS redirects your calls to windows\sysWOW64.

    Out of curiosity, why are you trying to recompile and manually install WinPcap. In some previous mail you were saying that you needed to build a WinPcap-based application. If so, there is no need to recompile WinPcap and reproduce the installer.

    Have a nice day
    GV

      ----- Original Message ----- 
      From: Dennis Drew 
      To: winpcap-users at winpcap.org 
      Sent: Monday, August 17, 2009 9:10 AM
      Subject: [Winpcap-users] Cannot get Packet.dll to load onr Vista

      Well, if I install the Wdpcap exe, and it installs a Packet.dll in the Windoes\System - or SysWOW64 directory, it can be found and runs. But when I build my own Packet dll in Win32 or 64 bit and put both in Windows System or SysWOW64, the Vista cannot "see" or load them. Whne I rename mine to Packet.dll_mine and rename the one installed by the Wdpcap installer to Packet.dll, everything is fine. By the way, under XP Pro, my Packet dll loads and runs fine. 

      Something is preventing a debug version to load under Vista. Anyone else having this problem and have a solution?

      Thanks,
      Dennis Drew

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