DLL Help

This is a discussion on DLL Help within the C Programming forums, part of the General Programming Boards category; I have a dll that I wrote a few years ago... and I cannot find the source for it. How ...

  1. #1
    Deb
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    DLL Help

    I have a dll that I wrote a few years ago... and I cannot find the source for it.
    How do I figure out what function parameters are...?

    I can view the JNI calls... but I'm not sure what the parameters are, or more specifically the order I need to send the parameters.

    Any guidance ??

    -Deb

  2. #2
    Mad OnionKnight's Avatar
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    I think you're out of luck. As far as I know C functions only get stored with their name, C++ functions are little more helpful as they're also stored with the sum of it's arguments size in bytes.

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    Deb
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    Is there a way to open the dll to see what the function takes for parameters?

    I found a program to give me the names of the funtions, but that's about it.

    (

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    Mad OnionKnight's Avatar
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    You could open the file with a program such as Dependency Walker. The reason you didn't get more than the names of the functions is because the DLL contains nothing more than that.
    You sure you don't have anything like an import library? That would be more useful.

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    Deb
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    I just have the dll and a few files that I created the dll from. I don't have all of them.
    Switching computer, years ago, blah, blah, and I apparently didn't copy the entire
    directory.

    I'll look into Dependency Walker...

    What does it mean to decompile a dll then?
    A dll only has names of functions?

  6. #6
    Mad OnionKnight's Avatar
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    No not just the names, it has the code for the functions too of course, probably some other stuff, but not the size of your arguments let alone the types. Decompiling a DLL might be worth doing, if you have some knowledge of assembly. C calls functions by pushing the arguments onto the stack in reverse order, the function then pops the stack for the arguments. By studying how your functions pops the stack you might gain some insight on the arguments.

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