My two cents: if you need to instrument native Windows applications, including Win32 and COM, my company develops three mature GPLv3 libs:

1/ Deviare In-Proc (like Microsoft Detours): https://github.com/nektra/Deviare-InProc

2/ Deviare Hooking Engine (even novices can instrument apps): https://github.com/nektra/Deviare2

3/ RemoteBridge (access internal COM and Java apps) https://github.com/nektra/RemoteBridge

All these libs include examples and there are additional use cases in our blog http://blog.nektra.com