Packet Editor Coding Help

Ok, so I understand that to write a packet editor you have to detour a process's calls to winsock's send() and recv() functions. My question is once you've wrote your dll file that detours the functions and you have injected it into a process, how do you get your injected .dll file to give the packet data to your main gui application for manipulation? I don't understand this part.

Inter-process communication - Wikipedia, the free encyclopedia or just create a GUI in your DLL.

I'd prefer to keep the gui separate from the dll, but thanks for pointing me in the right direction

Going to do some reading and see if I can wrap my head around IPC.