Replacing a stack
shari at gypsyware.com
Mon Oct 22 16:40:18 EDT 2007
>Execute the revert command after you download the preferences stack:
> revert stack prefsLocation
>What the revert command does is reload the stack from the copy on
>disk, replacing the copy in memory. Since the disk copy is the new
>version, this will suck the new version into memory, replacing the
Is there any chance that a stack remains in memory and that Rev
recreates it without my code telling it to? In my uninstaller, after
it deletes the preference stack, I discovered awhile back that my app
must immediately quit. Otherwise things would reappear. Nowhere in
my code does it say to create a stack, except in the startup routine.
Once the app is fully launched, it does not ever create a stack. I
am wondering if this is what's happening now when trying to replace a
stack. Jeanne, I added revert as follows, and the app fails to
launch at all.
Also, if I quit the app and open the pref stack manually and check
the xVersion, it shows that it's the old version, not the new one.
So it isn't just in memory, the actual stack is wrong. So the new
version never seems to get created. The old one is deleted, then
recreated somehow. There are no detours in the following code.
I added a lot of waits because sometimes that fixes weird problems.
To no avail this time.
repeat with x = 1 to the number of cds of stack prefStack
set the cantDelete of cd x of stack prefStack to false
if "UserPrefs" is in the stacksInUse then
stop using stack "UserPrefs"
delete stack "UserPrefs"
if "UserPrefs" is in the openstacks then
close stack "UserPrefs"
delete stack "UserPrefs"
wait 10 ticks # giving it a chance to fully finish
delete file prefStack
wait 30 ticks # giving it a chance to fully finish
answer "File deleted" # so that I can verify in the Prefs folder
# that the file is actually deleted
put decompress(the stackData of stack myAppStack) into s
put s into url ("binfile:" & prefStack)
save stack prefStack
wait 5 ticks # giving it a chance to finish
answer the xVersion of stack prefStack # gives the xVersion of
the deleted stack,
# if I quit everything then open what should be the newly created stack,
# it is the same as the deleted stack, the new version never appears.
# here is where I tried to add revert
revert stack dataPath
answer the xVersion of stack dataPath
# the entire app failed to appear when I added revert, it's as though
it just silently quit
# I never got an answer, nor a single window to appear, the app did
not appear in stacksInUse or openStacks
WlND0WS and MAClNT0SH shareware games
More information about the Use-livecode