I have used visual build a class project and then I get some dll, cope those dll to unity3d to use.
Here is the question,how dll send message to unity3d?
(for example I use dll listen the message from server,if dll got message,then dll send the message to unity) Thanks very much!
It’s not that they are separate and need to communicate. They both live in the same memory space. In Dll you define stuff: functions etc. and in your Unity project you just refer that stuff - call functions etc.
You can find the answer from this live-training-archive/writing-plugins