Support Win32 registry notify APIs

[cromefire]

Currently using JNA, the registry can only be polled all the time and there's no ability to watch a key using Advapi32Util.

The Win32 API does support RegNotifyChangeKeyValue though which would enable this functionality. It uses Events though which I have no Idea how to implement, so I don't think I'd be able to implement it myself. Not really a Windows low level dev...

In the Advapi32 interface the method is there, but it take a native pointer to some event handler and stuff which seems to be quite dangerous to use directly.

[JaredDavis22]

Did you look at the tests?

jna/contrib/platform/test/com/sun/jna/platform/win32/Advapi32Test.java

Line 704 in 86a2ff1

public void testRegNotifyChangeKeyValue() {

[cromefire]

I did not, though now I still have more questions, especially how the events work. In the test it seems to just block the thread until an event fires I guess? I'm still confused how I could get like a lambda subscribed to it, so I can be notified when it changes. Although it seems to block the thread anyways?

In the end having a Util method still sounds desirable to me as these direct APIs seem very... raw to me and not well integrated into java.

[JaredDavis22]

I think the next step would be to ask about how to structure the calls/thread(s) in the message group https://groups.google.com/g/jna-users