How to send messages between dlls

Question

I am creating an application with the following characteristics:

• A dialog based GUI, that uses n-instances of a dll (lets call it mainLib).
• The mainLib dll, uses another dll (lets call it commManager) that manages TCP communication with another app.

My problem, is how to make commManager notify the mainLib about certain messages it receives.

I suppose something like PostThreadMessage() could be the solution, but how do I implement it inside the dll?

Answer 1

Presumably, commManager runs on it's own thread. mainLib would need to create a message queue as described here. When mainLib creates commManager it would have to pass its thread id to it.

If you want blocking, another option would be to use callbacks. Have mainLib pass commManager a function pointer.