Shutdown Hook

Is there a way for us to detect user shutdown to call some other functions (DB cleanup, etc.)?

Edit: Btw, I’m using nwjs-sdk-v0.16.1-win-x64

[gwicksted]

I agree this would be both challenging to implement as a user of nwjs and likely trivial for the nwjs team to hook and perform a callback. In the meantime you’ll probably have to hack something together as proposed and, while the concept is simple, if you haven’t done it before, it could be quite daunting.

Just note that, even with the hook developed by the nwjs team, your app could be killed by the system before your api call finishes (there are several factors in play).

And if you implement a hack, there are several more factors: if it’s a second window it may not get to your code and the process may have exited (depending on nwjs implementation). Worse, it could be non-deterministic.

Best approach would be to fork nwjs and hook it yourself and submit a PR so it gets into master. I don’t have nwjs building from source or I’d take a stab at it.

[bluthen]

Yes also when I did it with python I created another window. I guess I should have noted in my previous message, I was listening for login switches rather than shutdown. So I never tried to do something before shutdown. That would be a good thing for the app I’m working on to do, now that I think about it.

So I can’t say definitively if it would close those other windows, you’ll have to try it. I guess I mainly trying to point out that WM_QUERYENDSESSION is not a signal, and hopefully point you in a slightly better direction.