Hello. I am thinking that Storable might be an efficient way to send complex data structures to perl over the network from a C program. Is the file format documented anywhere? I need to know how to store hashes, arrays, strings, etc... Thanks

You can easily embed perl code into C programs (although it's better to just write in perl in the 1st place, and not use C at all...) Your best solution would be to embed some perl that writes the STORABLE output you're trying to create, into whatever C program you're using.