newlispfanclub.alh.net

Posted: **Mon Nov 08, 2010 5:37 pm**

Playing with this area of newLISP. It seems to be not possible to communicate errors using catch.

> (catch (eval-string {(+ 2 2)}) 'result)
true
> 
> result
4
> (catch (eval-string {(+ 2 2}) 'result)
nil
> result
"ERR: missing parenthesis in function eval-string : \"...(+ 2 2                              \""
>
> ; so the basic idea works. Try it with spawn...
>
> (spawn 'p1 (catch (eval-string {(+ 2 2)}) 'result))
15789
> (sync 10)
true
> p1
true
> result
"ERR: missing parenthesis in function eval-string : \"...(+ 2 2                              \""
>

Is there a way to get results and errors from a spawned process using catch? Or is it a job for send/receive?

(newLISP v.10.2.8 on OSX IPv4 UTF-8)

Posted: **Mon Nov 08, 2010 6:23 pm**

the 'result' you ask for is not the 'result' from the spawned process but from the main process, where it had been set before.

Return 'result' from the spawned process to make it visible in 'p1':

Code: Select all

> (spawn 'p1 (begin (catch (eval-string {(+ 2 3}) 'result) result))
39123
> (sync 1000)
true
> p1
"ERR: missing parenthesis in function eval-string : \"...(+ 2 3

The only thing you get back from the spawned process is in 'p1'.

Posted: **Mon Nov 08, 2010 7:42 pm**

Ah, yes! That works great.

As ever - thanks Lutz!

newlispfanclub.alh.net

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