[Mono-list] DllImport error loading library '(null)

Tristan Zajonc tristanz at gmail.com
Tue Oct 12 12:24:38 EDT 2010


I'm trying to use the C# ZeroMQ bindings. However on Mono 2.8 and OSX
10.6.4, when I try to run an example application, I get a DLLImport error.

Unhandled Exception: System.DllNotFoundException: libzmq
  at (wrapper managed-to-native) ZMQ/C:zmq_init (int)
  at ZMQ+Context..ctor (Int32 io_threads) [0x00000] in <filename unknown>:0
  at local_lat.Main (System.String[] args) [0x00000] in <filename unknown>:0

This method is simply:

    [DllImport("libzmq", CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr zmq_init(int io_threads);

When I use MONO_LOG_LEVEL=debug, mono shows it looking for libzmq but
continually failing with things like:

Mono: DllImport loading library: './libzmq.dylib'.
Mono: DllImport error loading library '(null)'.

I've tried moving the libzmq.dylib to the local folder, setting up a
libzmq.dll.config file, and setting DYLD_FALLBACK_LIBRARY_PATH, all to no

Is there an obvious reason why Mono is failing to find libzmq.dylib, which
is located in /usr/local/lib? And why does the error become "(null)"?

Many thanks for any pointers,
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