Binding to stem_count control from JavaScript always fails

[SamWhited]

Bug Description

If I try to do something like the following in a plugin:

engine.makeConnection("[Channel1]", "stem_count", this.output.bind(this));

It always returns undefined. However, if I use engine.getValue I get the number of stems back as expected (unfortunately this is less useful because it doesn't appear that stem_count has always been updated before the output call if we're binding to another group such as the stem color, so the number you get back may be incorrect, I'm not sure if this is its own separate bug or expected behavior)

Manual page for this control: https://manual.mixxx.org/2.6/en/chapters/appendix/mixxx_controls#control-[ChannelN]-stem_count

Version

2.6

OS

Arch Linux

[Swiftb0y]

It always returns undefined

To clarify, does the makeConnection call return undefined (instead of a handle to the callback) or does the callback only receive undefined?

Have you tried creating the connection delayed? Maybe its a data race between different subsystems.

[SamWhited]

The makeConnection call returns undefined. If I add a timer in the buttons connect function and delay connecting by 5 seconds I see the same behavior.

[SamWhited]

Just got back to this binding and I can't reproduce this now, unsure if it was fixed or if I was just doing something dumb and typo-ing the channel name. Closing for now and I'll re-open this if it happens again.