Dynamic libraries

This is a discussion on Dynamic libraries within the C Programming forums, part of the General Programming Boards category; I am totally confused about the whole dynamic libraries concept. could someone give a brief description of what they are ...

  1. #1
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    Question Dynamic libraries

    I am totally confused about the whole dynamic libraries concept. could someone give a brief description of what they are and why they are used, or point me in the right direction (google was giving nothing away).

    most of all though; as I understand it, dynamic libraries are ones that are 'called' at runtime (?). How does the program locate the mentioned DL ???

    any help appreciated

    gaz

  2. #2
    Code Goddess Prelude's Avatar
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    >How does the program locate the mentioned DL ???
    The executable contains filenames that the loader uses to find the libraries at runtime. This is good because it makes the executable considerably smaller than statically linked programs, where the executable contains complete copies of the libraries. One can also create several executables that link to the same libraries, so it's not as wasteful there either.

    -Prelude
    My best code is written with the delete key.

  3. #3
    &TH of undefined behavior Fordy's Avatar
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    >>How does the program locate the mentioned DL ???

    There is a predefined search method (with windows anyway)....

    It goes somthing like;

    [list=1][*]The directory from which the application loaded. [*]The current directory for the process[*]The system directory (\windows\system or \windows\system32 depending on OS)[*]The windows directory[*]Whatever you have listed in the PATH environment [/list=1]

    You can also load the dlls at runtime afer execution of your code has started.....with this you can also specify alternate locations.

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    Smile

    Great - that search order is what I am looking for: does anyone know the search order for *nix?
    I take it that it is similar but with /usr/lib rather than winnt/system32??

    cheers

  5. #5
    Registered User lliero's Avatar
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    hi

    i want to add on what prelude said,,


    dll - are dynamic libraries..

    we have in process dll and outprocess dll

    in process dll are dll that executes within a process

    while outprocesss dll, obviously execute outside the process..

    so what are these things?

    in an in processDll
    when an application crashes it crashes the dll too
    together with those other application with it..

    in an outprocess
    when an application crashes it does not crahes the
    dll..


    i hope i contributed something
    " programming is 1% syntax and 99% logic "

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