Thread: Spying processes

  1. #1
    Registered User
    Join Date
    Mar 2005

    Spying processes

    I've to write a Win32 program that,given a file,tells me what process uses it...tricky uh?

    Perhaps i could use a cicle like this :

     for(..some condition..){
         LockFileEx(handle to the file to control, ...... , ... , ..... , ... );
         Use GetLastError() and FormatMessage() for checking if an     error has occured
       and,if it is so,then some other process is reading the file and the 
       FormatMessage() function will tell me information about that process (i think)
       if i call it with the error code returned by GetLastError()
       Otherwise , if there's no error , UnlockFileEx(.....);
    could it work?

  2. #2
    Join Date
    Oct 2004
    I dont get what you want to do are you trying to check to see if a process is allready running?

  3. #3
    Registered User
    Join Date
    Jan 2005
    Quote Originally Posted by Lionel
    could it work?
    No GetLastError just returns an error code and FormatMessage traslates that error code into a desription of that error but
    dosen't give anymore specific information.
    Doing this would be tricky maybe the tool filemon from might be of some use.

  4. #4
    Registered User
    Join Date
    Sep 2004
    You could do this by hooking the API functions OpenFile(), CreateFileA(), and CreateFileW(). Hooking API functions is pretty tricky though, so I suggest finding another way around the problem you are facing.

  5. #5
    Yes, my avatar is stolen anonytmouse's Avatar
    Join Date
    Dec 2002
    You can get the processes that have a file open but I think you're moving into the undocumented.

  6. #6
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Sounds a bit like you're trying to write (part of)
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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