Message Path Problems

[Sarah]

Rev does not always give an error message when a faulty script fails to 
compile. The solution is to go back and add a completely new line to 
your script. This will force the engine to re-think the compilation and 
you may get an error message showing the problem.

Sarah
... gradually working through a massive build-up of Rev emails :-)


On Tuesday, January 28, 2003, at 07:20  am, livfoss at blueyonder.co.uk 
wrote:

> Dear List
>
> I found out the hard way that when there is a compile error in a 
> script, then **all** the handlers in that script are nuked, i.e. they 
> simply evaporate and so messages that expect to find such handlers in 
> the message path suddenly generate 'can't find handler' errors. So 
> it's no good putting 10 handlers in a script and debugging their 
> syntax one by one (you can of course do it with the semantics).
>
> When there is a compile error after editing a script, it is reported 
> (I thought) when you hit the 'Apply' button, thus warning you of 
> problems to come. However, I've just experienced a problem where an 
> already working handler appears to have been eliminated from my 
> mainstack/ message path without any explicit error showing up. I can't 
> work out how to find the error. The mainstack is called 'SC_Anchor', 
> and I've noticed that after the 'can't find stack' error occurs,
>
>   put exists(stack "SC_Anchor") returns 'true', but that
>
>   put exists(the script of stack "SC_Anchor") returns 'false'
>
> OTOH, my testing sequence always starts when I send a message from the 
> message box saying
>
>   send "startUp" to stack "SC_Anchor"
>
> and that always works... (BTW, this is my solution - suggested earlier 
> by someone on this list - to the problem of not being able to use a 
> 'startUp' handler within the development environment).
>
> I have checked the spelling of the handler's name and I've also 
> checked that the handler's script is well formed. Just don't know what 
> to do next. I would like to list all the handlers in the stack known 
> to the Revo environment, but I don't know how.
>
> Any help gratefully accepted!
>
> Graham
>
>
> Graham Samuel / The Living Fossil Co. / UK & France
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