If the could storage the stack is on has write access, the easiest
mechanism is a file based flag.
When the stack is launched, if checks:
if there is a file <filespec> then
-- the stack is already open, so exit
else
put empty into URL ("file:"&<filespec>) -- creates a empty file to
mark as open
end
and when the stack exists remove the file
on quit
delete file <filespec>
end quit
Or something like that. I do not have LC open to check my code above.
On 1/25/2021 7:24 PM, Marty Knapp via use-livecode wrote:
I have an app that allows user to create specialized editable documents
(stacks) that open in my app. Some customers use Dropbox, iCloud, OneDrive or
similar to store these documents so that they can be accessed from 2 different
computers. Is there a way to tell if a stack is already open on one computer? I
need to prevent them from opening a 2nd instance of the stack on the other
computer so that Dropbox (or other cloud sync service) does not create a
conflicted copy.
If there is not a way to tell, has anyone created some sort of stack
check-out/check-in system that they'd be willing to share? I need this for Mac,
PC and mixed.
Marty
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