Proper error handling in a setprop

[dunbarx at aol.com]

I am missing what you are asking. A setProp control structure is similar to a command control structure. It triggers when the explicitly associated custom property is changed.


Once started, it acts like any other handler, executing statements and perhaps placing a new value into the property. Errors would appear normally, like in any handler, where the engine stops execution and you deal as you please with the situation. 


They could not be placed in a "try" structure. They are themselves control structures. No control structure can be placed inside another:


on doThis
  on doThat
  end doThat
end doThis


No, no. None of that.


Or do I have this totally wrong?


Craig Newman



-----Original Message-----
From: Michael Doub <mikedoub at gmail.com>
To: How To use LiveCode use LiveCode <use-livecode at lists.runrev.com>
Sent: Fri, Oct 10, 2014 6:37 pm
Subject: Proper error handling in a setprop


Can anyone advise me on the options that we have for dealing with errors that 
are encountered while executing in a setprop?    I was thinking of using set 
prop to turn on and off the GPIOs on a raspberry pi.   I have commands doing it 
now and it is working fine.   

Do you throw an error and assume the user is calling the set prop inside of a 
try statement?   Are there other ways?

Thanks in advance
    Mike


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