Hi Len,
Here are some things I've learned. Hopefully they apply in some measure
to what you're doing:
- getting a custom property of a stack will indeed load it. I use "get
the fakeProperty of stack x" frequently for that need, where "x"
contains a stack filename. I haven't tried it with a URL.
- if you want to replace an in-memory stack with a newer version that's
on a server, one simple and reliable way to do it is download the server
stackfile under a temp name, then (if the download was successful)
rename the temp file to the filename of the one you want to replace,
then use Rev's "revert" command to replace the in-memory copy with the
downloaded one. Notice that this approach does not load the server stack
into memory until "revert".
Also see below.
Len Morgan wrote:
I'm trying to go through a list of stack files (whos' names and
versions come from a text file on the update server) to see if they
need to be updated. If there is a newer version, I copy the file from
the update server to the local computer. I'm using:
put the cstkVersion of stack tCurrentStack into tLocalStackVersion
This should work fine as long as "tCurrentStack" contains a stack filename.
That command is the first time I reference any of the stack files as
the program starts up. My understanding is that by reference a custom
property in the local stack, it is "loaded." These stacks do NOT
however show up in the Application Browser.
Was the App Browser already open when you got the stack's
customProperty? The App Browser usually refreshes when stacks are opened
(as in "go to" or "toplevel") but I'm not sure about loaded stacks. You
might have to close it and reopen it to see new stacks in memory.
Since (I assume) the stack get loaded, I set a flag if any of the
stacks are copied (updated) from the server and then require the user
to restart the program. The second time, since all of the local file
versions should now much the server version, it goes through the same
process but since no stacks are updated this time, the program
continues to run "normally."
So my question is: Does the stack really get loaded? If so, can it be
unloaded and reloaded so that the new version will be used instead? I
understand that if the version of the startup stack changes (called by
StackRunner), I'll have to restart, but that stack is rarely changed.
Would I be better off just copying the files from the server every
time the user starts up the program whether they are changed or not?
Can I use a URL stack file name instead of a local one? Since I'm not
explicitly loading the stacks, I'm not sure if the checking of the
custom property has the same effect as "start using...." or "go stack
..." One can be used with a URL, the other can't.
Thanks!!
len morgan
Hope this helps.
--
Phil Davis
PDS Labs
Professional Software Development
http://pdslabs.net
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