DllNotFoundException with DllImport in Mono on Mac: wrong architecture

Question

I'm trying to interop with the ImageMagick library in Mono on a Mac. I installed the ImageMagick library with MacPorts and have verified that the file libMagickWand.dylib exists in the directory /opt/local/lib. I've also created a soft link to that file in the directory /usr/local/lib.

Here's my DllImport statement:

[DllImport("libMagickWand", EntryPoint = "MagickWandGenesis")]
static extern void WandGenesis();

Here's my App.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <dllmap dll="libMagickWand" target="/opt/local/lib/libMagickWand.dylib" />
</configuration>

And, at the call to WandGenesis();, I get a DllNotFoundException, with the message 'libMagickWand'.

I've read this page and I think I'm following all the rules. Is there anything else I can try?

Update:

I ran the .exe with MONO_LOG_LEVEL=debug. Here is the pertinent information:

Mono: DllImport error loading library 'dlopen(/opt/local/lib/libMagickWand.5.dylib, 9):
no suitable image found.
Did find: /opt/local/lib/libMagickWand.5.dylib: mach-o, but wrong architecture'.

wrong architecture: I'm running Snow Leopard in 32-bit mode and always have. I installed ImageMagick with MacPorts, and I installed Mono with the Mac package from mono-project.com. What would have been compiled with a different architecture?

Update:

I think I found my problem:

MacBook-Pro:lib ken$ lipo -info libMagickWand.5.dylib
Non-fat file: libMagickWand.5.dylib is architecture: x86_64

Update:

...but I'm still having issues. I can't seem to figure out how to compile ImageMagick with i386 architecture. When I try to do so using flags, it complains about other libraries that were compiled as 64-bit.

Answer 1

Update:

Mono on Mac OS X is 32 bit (at least usually, you can confirm that with mono --version) and you are trying to link with 64bit binary which is not possible. You have to provide 32-bit binary (or use 64-bit Mono).

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Do you have the error even when only the library's file name is in the target and the library is placed appropriately (or the DYLD_LIBRARY_PATH set)? In such case please provide the output of mono executed with MONO_LOG_LEVEL=debug.