On Dec 3, 2007, at 7:20 AM, paolo mazza wrote:
I tryed a simpler solution. The following script (ONLY FOR MACOSX)
will
upload all the externals placed in the Externals folder of the bundle
standalone application. As far as I know it works fine . Why I
have to
create a stack "myExternals" ? Am I going to face some problems using
this simple script at sturtUp of the application?
Hi Paolo,
As Klaus mentioned using startup is perfectly fine for setting
externals. I'm providing a few extra specifics about why I use the
separate stack method in my work to help clarify when it might be
needed.
I use a separate stack in memory to load externals in my application
framework. When the framework loads an application in the IDE it
checks to see what externals Revolution already loaded. It will then
load any externals that the application relies upon but which are not
yet available. Since the framework cannot rely on a startup message
when loading an application inside of the IDE a separate stack of some
sort must be used.
Some application designs have multiple stack files. In order to make
external handlers available to all stacks you must put the stack that
loaded the externals into use (start using stack
SOME_STACK_WITH_EXTERNALS_SET). Any handlers defined in that stack
script will also be put into use and be available to all scripts.
Using a separate stack helps keep the externals isolated. I know that
loading the externals and putting the stack into use only loads
external handlers into the message path, nothing else.
Using a separate stack makes it easy to load/unload externals from
memory. This might be useful if you update the externals on disk and
don't want to quit and relaunch the IDE or the application.
Using a separate externals stack is more flexible overall. If you need
that sort of flexibility then it is worthwhile to go that route. If
you don't then using the startup handler and setting the externals of
your main program stack is just fine.
--
Trevor DeVore
Blue Mango Learning Systems
www.bluemangolearning.com - www.screensteps.com
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