Re: Wait Until Process Completion
Re: Wait Until Process Completion
- Subject: Re: Wait Until Process Completion
- From: "Mark J. Reed" <email@hidden>
- Date: Mon, 12 May 2008 21:55:21 -0400
When ps can't find the requested pid, it exits with nonzero status,
signalling an error. In Leopard, "do shell script" propagates such
shell errors into AppleScript errors. This makes it easier for AS to
take advantage of the many shell tools that produce no output but
instead signal a condition via their exit status, without having to do
something extra within the shell command line..
On 5/12/08, Luther Fuller <email@hidden> wrote:
> The following worked correctly in Tiger.
>
> repeat
> delay 1
> do shell script "ps -p " & pid --<<<<
> if not (the result contains pid) then exit repeat
> end repeat
>
> But, in Leopard, the line marked --<<<< errors (= 1) and my script
> stops.
> So, I replaced it with ...
>
> repeat
> delay 1
> try
> do shell script "ps -p " & pid
> on error
> exit repeat
> end try
> end repeat
>
> and now my script is again working correctly. But why?
> Something has changed its behavior.
> Does anyone know what's going on here?
>
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