[Mono-devel-list] How to use shared library with C# on linux

[Chris Turchin]

Hi all, 

to clear this up for myself (not being a c-programmer shared libs
are/were foreign to me) I wrote a little sample based on Daniel's work
creating a shared library, then using it in a c program and finally
DLLImporting it into a csharp program as well. I needed much more time
getting it to work in c than csharp but that is likely due to the fact
that the last time I delved into the subject was in CS141 back in
1996...

;-)

What I found out:

> I think the problem in this case is that the runtime doesn't have a
> mapping set up to find the library; you're going to need to edit
> /etc/mono/config and add a <dllmap> entry. (As far as I know, there's no
> way to extend this scheme, which seems like it could be a big problem
> for third-party apps to me).

This doesn't seem to be true. I simply set LD_LIBRARY_PATH to include
the lib dir in question and things worked. I think I needed to do this
to compile/run the c-program as well...

I also ran into the "mono wants to append 'lib' to the to-be-imported
library name problem". To solve it, I just renamed the lib (libtest.so)
and then did [DllImport("test")] instead.

It works now for me in my simple c and csharp app. Maybe this
mini-tutorial can help someone else out there to understand it too. 

Regards,
--chris

ps: yes, i know the c-code and the makefile probably are horrid, but it
works for me :-P

pps:btw, if its relevant: I am testing this on a Mandrake 9.1 system
with gcc 3.2.2 and 0.28 mono from redcarpet.
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