Intel mnemonic to machine code converter library

Question

I'm trying to do the following: take a single IA32 instruction in the Intel syntax (such as ADD EAX, EBX) and produce the corresponding machine code for this instruction. Is there some small library, preferably open source, that can do this for me?

Answer 1

You can do it with FASM.
There is a sample GUI application distributed with FASM DLL
Or, you can use Python interpreter, with Python binding for FASM DLL