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FSX [C#] Asynchronous notification on XPNDR

P

pczekalski

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2
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poland
Hello World!

I'm brand new to the FSX development but trying my best to create external transponder. I'm just trying to read Squawk code from FSX using Simconnect API and managed code libraries. Works well as instant requesting "TRANSPONDER CODE:1", but I don't like the approach where data are being pulled from FSX, while there is a system for event notification triggered by FSX (it has also a performance impact).

Thus I've switched from pulling to asynchronous model with events subscriptions and I'm stuck: I found a lot of XPNDR-related events in simconnect SDK reference like changing single digit of the code, w. or w/o carry, etc.
It works well but I'm sure there are other events that may change the squawk in fsx and my application will be aware of it, so is there any "general" transponder code change event fired, regardless of the reason of the change?
The first problem I've identified is that the above doesn't work when squawk is changed as a result of ATC communication (i.e. when switching flight following from one center to another).

Thanks in advance for any help.

Peter
 
Hi Peter.

I really can't help with the problem, but I confess i have a very hard time not falling back on pulling or polling for data. Hard for me to get my head around it. My programming by nature is 'cyclical'... probably a result of learning basic as a first language.

Hopefully, someone else can give a good response.

Dick
 
Thanks, but ...

Thanks for the quick reply Dick.

Indeed I found that different implementations of transponder (in different plane models) are triggering some exotic events, so you're right - iterative approach seems to work better. I'm almost unable to identify and handle all events that may be triggered when there is a change on Squawk, so I'm switching back to active pulling with some reasonable period.
BTW - the Simconnect's SDK reference shows TRANSPONDER CODE:index to be non-settable. So how do one set the desired Squawk code?

Regards,

Peter
 
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