How can I transfer a C console application to work as a native iOS plugin with unity?

I am trying to get MIDI input for my unity project (for IOS). Since there is no direct support for MIDI I am trying to write a native plugin myself. I got a C console application working using CoreMidi, but now I have no idea how to connect it with unity, since all the examples I can find are using Objective C. Maybe anybody can help me, thanks!