How to intercept window events from an embedded dll?

Question

DLL

There is a program, I want to transfer frequently used actions to buttons ("ToolbarWindow32"), for this I implemented my dll using "CreateRemoteThread", I created the buttons, everything is ok.
There was a problem with handling pressing. As far as I understand, you need to track the WM_COMMAND call somehow.

If you do it through "SetWindowsHook", in fact, the same dll will be injected again ...
but then you will have to keep the injecting program running all the time while the main one is running - and this would not be desirable.
In general, how to proceed?

Answer 1

https://docs.microsoft.com/en-us/windows/win32/api...
With the GWL_WNDPROC parameter
Push your window procedure and that's it.