Explicit Variables again

Peter Haworth pete at lcsql.com
Fri Oct 19 14:18:28 EDT 2012

Thanks for the explanation and QCC request to document it.  Hopefully they
documentation update will include the msgChanged message too.
lcSQL Software <http://www.lcsql.com>

On Fri, Oct 19, 2012 at 10:25 AM, Richard Gaskin <ambassador at fourthworld.com
> wrote:

> Peter Haworth wrote:
>  messageBoxRedirect?  I can find no mention of that in the dictionary.
>>  What
>> does it do?
>> I look forward to seeing your message box replacement Richard.  I have
>> that
>> as a future enhancement to my lcStackBrowser plugin but sounds like you
>> may
>> have saved me the trouble!
> My bad: it's actually called "revMessageBoxRedirect".
> And you're right:  oddly, it isn't documented, but can potentially be
> useful for other things than what it was originally implemented for, so I
> just logged a request for its documentation:
> <http://quality.runrev.com/**show_bug.cgi?id=10481<http://quality.runrev.com/show_bug.cgi?id=10481>
> >
> The revMessageBoxRedirect global property was originally added at my
> request to overcome a limitation formerly in the engine which prevented us
> from replacing the Message Box stack without crashing.  I was pursuing a
> path for migrating portions of the MetaCard IDE for use within the LiveCode
> IDE, and this was preventing that work from going forward.
> Their solution for this far exceeded my expectations, and can be useful
> for all sorts of MB replacements and diagnostic tools.
> The revMessageBoxRedirect global prop defaults to empty, and when empty
> any "put" commands have their output sent to the main field in a stack
> named "Message Box" (and you really should use only LC's provided Message
> Box stack, because I've found that attempting to replace it with another of
> the same name on the fly is problematic).
> But you can set the value of the revMessageBoxRedirect to the long ID of
> any object, and after having done so that object will then receive a new
> message, msgChanged, whenever any script triggers an action that would
> normally put output into the Message Box, e.g.:
> on msgChanged pMsg
>   put pMsg into fld "Messages" of stack "My Cool Message Box"
> end msgChanged
> Certainly a specialized need, which may be why they've never bothered to
> document it.
> But serious toolmakers will find it interesting, and it can lend itself to
> certain types of logging solutions which can be useful and fun to build.
> --
>  Richard Gaskin
>  Fourth World
>  LiveCode training and consulting: http://www.fourthworld.com
>  Webzine for LiveCode developers: http://www.LiveCodeJournal.com
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