Win32 API - Dynamic Link Library Loading - behind the scenes

This is a discussion on Win32 API - Dynamic Link Library Loading - behind the scenes within the Windows Programming forums, part of the Platform Specific Boards category; Hi everybody ! My problem is that I want to load a library (DLL) that resides in memory. I am ...

  1. #1
    Unregistered
    Guest

    Question Win32 API - Dynamic Link Library Loading - behind the scenes

    Hi everybody !

    My problem is that I want to load a library (DLL)
    that resides in memory. I am not a newbie, nor
    do I need any help with C/C++. Actually this
    questions is targeted at those amongst you
    who have got some deeper knowledge of the
    Win32 Sub-system. Concerning dynamic loading
    of libraries you would either statically link a DLL's
    library to the final executable or load the DLL
    at runtime via LoadLibrary() and then get the
    the address/handle via GetProcAddress of the
    relevant function.
    What I want to do is to load a DLL without using
    the mentioned functions. Win32 is doing quite a lot
    _behind the scenes_ - For Example RVA to Offset
    calculation and such stuff is done via APIs
    that are rather undocumented. IAT patching is also
    done in the background - without any user interaction
    respectively user code being involved in that process.
    Although I do know a couple of functions that are
    executed I don't know everything what's going on
    behind LoadLibrary() and GetProcAddress().
    In particular I need those functions that are involved
    with memory mapped files - DLLs are mapped when
    being executed. So that I would be able to
    load an image of a DLL that's beein loaded into the memory
    without the usual functions.

    Thanks for all comments/ideas (if any)


    regards

    Mike

  2. #2
    &TH of undefined behavior Fordy's Avatar
    Join Date
    Aug 2001
    Posts
    5,789
    I dont know exatly why you dont wish to load the library using the standard methods........your "_behind the scenes_" concerns about the standard API methods have never bothered me....but then I dont know exactly what you are trying to do.......

    I know how the system uses Memory mapping to load dlls....but I dont know if it would be easy (or even possible) to access this map in another process.....assuming this is what you are proposing....also I dont know if that code would be usable by you even if you had access to it

    Like I said, I dont know what you are trying to do so I dont know what more I could suggest on this.............

  3. #3
    Registered User M!ke's Avatar
    Join Date
    Apr 2002
    Posts
    3
    Originally posted by Fordy
    I dont know exatly why you dont wish to load the library using the standard methods........
    Well, an example:
    I've got an image of a DLL already loaded in memory.
    Let's say the image is a custom resource which
    has been loaded and mapped into memory.
    Now, actually LOADING that DLL would require
    to DUMP that DLL to the harddisk - as a file so
    that in can be loaded by the corresponding standard
    functions which require files instead of memory
    areas.

    Originally posted by Fordy
    your "_behind the scenes_" concerns about the standard API methods have never bothered me....
    Most API-calls basically call sub-system functions -
    especially under Win NT and its derivates.

    Originally posted by Fordy
    but then I dont know exactly what you are trying to do.......
    In short I described it ... though, the actual
    application is siginificantly more complicated
    and would take too long to explain.


    Originally posted by Fordy
    I know how the system uses Memory mapping to load dlls....
    Do you know details of what's happening INSIDE -
    behind LoadLibrary/GetProcAddress ?
    Memory Mapping itself is not a problem...
    But processing the subtleties of the PE-File format
    is what I need to do at runtime in memory -
    without any files being present or accessed.


    Originally posted by Fordy
    but I dont know if it would be easy (or even possible) to access this map in another process.....
    yes, you CAN access a map in another process -
    though this is actually not what I need to do.


    Originally posted by Fordy
    assuming this is what you are proposing....also I dont know if that code would be usable by you even if you had access to it
    shouldn't be a problem - it's a little bit tricky.

    Originally posted by Fordy
    Like I said, I dont know what you are trying to do so I dont know what more I could suggest on this.............
    thanks, anyway !

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. Link to MSDN's win32 info?
    By EvBladeRunnervE in forum Windows Programming
    Replies: 1
    Last Post: 04-20-2003, 02:05 PM
  2. Win32 API
    By Liger86 in forum Windows Programming
    Replies: 2
    Last Post: 01-30-2003, 01:19 PM
  3. link error: with Boost date_time library
    By Hotman_x in forum C++ Programming
    Replies: 0
    Last Post: 01-14-2003, 06:54 AM
  4. .lib vs .h vs .dll
    By Shadow12345 in forum C++ Programming
    Replies: 13
    Last Post: 01-01-2003, 04:29 AM
  5. What is a DLL (Dynamic Link Library)
    By Perica in forum C++ Programming
    Replies: 8
    Last Post: 11-02-2002, 12:31 PM

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21