Explicit Variables again
ambassador at fourthworld.com
Fri Oct 19 13:25:30 EDT 2012
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:
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
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"
Certainly a specialized need, which may be why they've never bothered to
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.
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