subject:"Close and Delete a stack"

Re: Close and Delete a stack

2016-10-14 Thread Richard Gaskin


Graham Samuel write:

> I have a situation where I want to close a stack and then delete it,
> so that it no  longer exists in memory and so that no naming
> conflicts occur when I load a fresh stack with the same name. This
> used to work - part of a script running in a different stack to the
> one being deleted:
>
>   set the cantDelete of stack "myDataStack" to false
>
>   set the destroyStack of stack "myDataStack" to true
>
>   set the destroyWindow of stack "myDataStack" to true
>
>   close stack "myDataStack" -- this should ensure that there are no
> messages operating in that stack
>
>   delete stack "myDataStack" -- this should remove it from memory

Here I can create a new stack, save it, then run:

   delete stack "stackname"

..in the Message Box and the stack both disappears from screen and is 
removed from the Project Browser.


One small bug:  if I then set the stack's destroyStack to true, save it, 
then close it, the Project Browser still lists it until I close and then 
re-open the PB.  That seems a bug.


But as for the script above, if that worked as shown in earlier versions 
it may be that a bug was fixed:


When I set the stack's cantDelete property to true and then try to 
delete it, I get:


   Error with "delete stack "stackname""at line 0: stack locked,
   or object's script is executing

Once I turn off the cantDelete property, the stack can then be deleted 
as expected.


--
 Richard Gaskin
 Fourth World Systems
 Software Design and Development for the Desktop, Mobile, and the Web
 
 ambassa...@fourthworld.comhttp://www.FourthWorld.com

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Re: Close and Delete a stack

2016-10-14 Thread Graham Samuel

Can any IDE experts out there explain exactly how the IDE does ‘Close and 
Remove from Memory’? I am having trouble trying to recreate this code for my 
standalone, and I am fairly sure that the code has to be different for LC8.x 
compared to earlier versions. To be clear, I’m trying to remove all trace of a 
mainstack by executing a script from within another mainstack.

TIA

Graham
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Re: Close and Delete a stack

2016-10-14 Thread Graham Samuel

Should have said, yes it’s a mainstack. I am beginning to think that the issue 
is that when I close the stack it is also purged from memory (as it says in the 
Dictionary, with provisos that I think I have obeyed), so that the following 
‘delete’ doesn’t have anything to delete - this should generate an error, but 
not 347.  

I find that if I simply cut out the ‘delete stack’ line, then everything works 
- this includes reloading a stack with the same name as the one closed, and no 
name conflict occurs. OTOH the Project Browser in the IDE claims the stack is 
still there, and an ‘exists’ enquiry returns true! Odd. The struggle now is to 
reduce this to something small enough to report as a bug.

Not sure if anyone else is interested in this, but if so, thanks for listening!

Graham

> On 14 Oct 2016, at 11:30, Graham Samuel  wrote:
> 
> Phil, thanks for the suggestion. I timed out last night and tried it this 
> morning. Strangely it didn’t work - got the same error as before (347). So 
> I’m still investigating. I am fairly sure that there is an obscure bug (or at 
> the very least, a change of behaviour) in LC 8.1.x compared to earlier 
> versions, but it is not straightforward. Onward!
> 
> Graham
> 
>> On 13 Oct 2016, at 19:32, Phil Davis  wrote:
>> 
>> Hi Graham,
>> 
>> What happens if you do only this?
>> 
>>  lock messages -- assuming you don't want any handlers to be
>>  triggered by the stack's closing
>>  delete stack "myDataStack"
>> 
>> I'm also assuming "myDataStack" is a mainStack and not a substack. (As you 
>> know, you can't remove a substack from memory independent of its mainStack 
>> unless you end its existence with "delete stack".)
>> 
>> Food for thought...
>> 
>> Phil Davis
>> 
>> 
>> 
>> On 10/13/16 10:10 AM, Graham Samuel wrote:
>>> I have a situation where I want to close a stack and then delete it, so 
>>> that it no  longer exists in memory and so that no naming conflicts occur 
>>> when I load a fresh stack with the same name. This used to work - part of a 
>>> script running in a different stack to the one being deleted:
>>> 
>>>  set the cantDelete of stack "myDataStack" to false
>>> 
>>>  set the destroyStack of stack "myDataStack" to true
>>> 
>>>  set the destroyWindow of stack "myDataStack" to true
>>> 
>>>  close stack "myDataStack" -- this should ensure that there are no messages 
>>> operating in that stack
>>> 
>>>  delete stack "myDataStack" -- this should remove it from memory
>>>  What happens in 8.1.1 rc2 (on a Mac with El Capitan, if that’s relevant) 
>>> is that all goes well until the ‘delete’ command, when I get error 347, 
>>> which is “stack locked, or object’s script executing”. Well, since the 
>>> stack is closed (this is apparent on the screen), its scripts can’t be 
>>> running, and it’s not locked (whatever that means - the dictionary is not 
>>> helpful), I don’t think the error is the correct one.
>>> 
>>> The problem exists both in the IDE and in the standalone version of the 
>>> program.
>>> 
>>> I have two problems tracking this down:
>>> 
>>> (a) it used to work up to LC7.x; and
>>> 
>>> (b) an attempt to abstract the issue by repeating it with some very simple 
>>> stacks doesn’t demonstrate the error.
>>> 
>>> Can anyone suggest an approach to debugging this?  I am totally foxed.
>>> 
>>> TIA
>>> 
>>> Graham
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>> 
>> -- 
>> Phil Davis
>> 
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> 
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Re: Close and Delete a stack

2016-10-14 Thread Graham Samuel

Phil, thanks for the suggestion. I timed out last night and tried it this 
morning. Strangely it didn’t work - got the same error as before (347). So I’m 
still investigating. I am fairly sure that there is an obscure bug (or at the 
very least, a change of behaviour) in LC 8.1.x compared to earlier versions, 
but it is not straightforward. Onward!

Graham

> On 13 Oct 2016, at 19:32, Phil Davis  wrote:
> 
> Hi Graham,
> 
> What happens if you do only this?
> 
>   lock messages -- assuming you don't want any handlers to be
>   triggered by the stack's closing
>   delete stack "myDataStack"
> 
> I'm also assuming "myDataStack" is a mainStack and not a substack. (As you 
> know, you can't remove a substack from memory independent of its mainStack 
> unless you end its existence with "delete stack".)
> 
> Food for thought...
> 
> Phil Davis
> 
> 
> 
> On 10/13/16 10:10 AM, Graham Samuel wrote:
>> I have a situation where I want to close a stack and then delete it, so that 
>> it no  longer exists in memory and so that no naming conflicts occur when I 
>> load a fresh stack with the same name. This used to work - part of a script 
>> running in a different stack to the one being deleted:
>> 
>>   set the cantDelete of stack "myDataStack" to false
>> 
>>   set the destroyStack of stack "myDataStack" to true
>> 
>>   set the destroyWindow of stack "myDataStack" to true
>> 
>>   close stack "myDataStack" -- this should ensure that there are no messages 
>> operating in that stack
>> 
>>   delete stack "myDataStack" -- this should remove it from memory
>>   What happens in 8.1.1 rc2 (on a Mac with El Capitan, if that’s relevant) 
>> is that all goes well until the ‘delete’ command, when I get error 347, 
>> which is “stack locked, or object’s script executing”. Well, since the stack 
>> is closed (this is apparent on the screen), its scripts can’t be running, 
>> and it’s not locked (whatever that means - the dictionary is not helpful), I 
>> don’t think the error is the correct one.
>> 
>> The problem exists both in the IDE and in the standalone version of the 
>> program.
>> 
>> I have two problems tracking this down:
>> 
>> (a) it used to work up to LC7.x; and
>> 
>> (b) an attempt to abstract the issue by repeating it with some very simple 
>> stacks doesn’t demonstrate the error.
>> 
>> Can anyone suggest an approach to debugging this?  I am totally foxed.
>> 
>> TIA
>> 
>> Graham
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> 
> -- 
> Phil Davis
> 
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Re: Close and Delete a stack

2016-10-13 Thread Phil Davis


My comment wrapped. Sorry.
Phil

On 10/13/16 10:32 AM, Phil Davis wrote:

Hi Graham,

What happens if you do only this?

   lock messages -- assuming you don't want any handlers to be
   triggered by the stack's closing
   delete stack "myDataStack"

I'm also assuming "myDataStack" is a mainStack and not a substack. (As 
you know, you can't remove a substack from memory independent of its 
mainStack unless you end its existence with "delete stack".)


Food for thought...

Phil Davis



On 10/13/16 10:10 AM, Graham Samuel wrote:
I have a situation where I want to close a stack and then delete it, 
so that it no  longer exists in memory and so that no naming 
conflicts occur when I load a fresh stack with the same name. This 
used to work - part of a script running in a different stack to the 
one being deleted:


   set the cantDelete of stack "myDataStack" to false

   set the destroyStack of stack "myDataStack" to true

   set the destroyWindow of stack "myDataStack" to true

   close stack "myDataStack" -- this should ensure that there are no 
messages operating in that stack


   delete stack "myDataStack" -- this should remove it from memory
   What happens in 8.1.1 rc2 (on a Mac with El Capitan, if that’s 
relevant) is that all goes well until the ‘delete’ command, when I 
get error 347, which is “stack locked, or object’s script executing”. 
Well, since the stack is closed (this is apparent on the screen), its 
scripts can’t be running, and it’s not locked (whatever that means - 
the dictionary is not helpful), I don’t think the error is the 
correct one.


The problem exists both in the IDE and in the standalone version of 
the program.


I have two problems tracking this down:

(a) it used to work up to LC7.x; and

(b) an attempt to abstract the issue by repeating it with some very 
simple stacks doesn’t demonstrate the error.


Can anyone suggest an approach to debugging this?  I am totally foxed.

TIA

Graham
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--
Phil Davis


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Re: Close and Delete a stack

2016-10-13 Thread Phil Davis


Hi Graham,

What happens if you do only this?

   lock messages -- assuming you don't want any handlers to be
   triggered by the stack's closing
   delete stack "myDataStack"

I'm also assuming "myDataStack" is a mainStack and not a substack. (As 
you know, you can't remove a substack from memory independent of its 
mainStack unless you end its existence with "delete stack".)


Food for thought...

Phil Davis



On 10/13/16 10:10 AM, Graham Samuel wrote:

I have a situation where I want to close a stack and then delete it, so that it 
no  longer exists in memory and so that no naming conflicts occur when I load a 
fresh stack with the same name. This used to work - part of a script running in 
a different stack to the one being deleted:

   set the cantDelete of stack "myDataStack" to false

   set the destroyStack of stack "myDataStack" to true

   set the destroyWindow of stack "myDataStack" to true

   close stack "myDataStack" -- this should ensure that there are no messages 
operating in that stack

   delete stack "myDataStack" -- this should remove it from memory
   
What happens in 8.1.1 rc2 (on a Mac with El Capitan, if that’s relevant) is that all goes well until the ‘delete’ command, when I get error 347, which is “stack locked, or object’s script executing”. Well, since the stack is closed (this is apparent on the screen), its scripts can’t be running, and it’s not locked (whatever that means - the dictionary is not helpful), I don’t think the error is the correct one.


The problem exists both in the IDE and in the standalone version of the program.

I have two problems tracking this down:

(a) it used to work up to LC7.x; and

(b) an attempt to abstract the issue by repeating it with some very simple 
stacks doesn’t demonstrate the error.

Can anyone suggest an approach to debugging this?  I am totally foxed.

TIA

Graham
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--
Phil Davis

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Close and Delete a stack

2016-10-13 Thread Graham Samuel

I have a situation where I want to close a stack and then delete it, so that it 
no  longer exists in memory and so that no naming conflicts occur when I load a 
fresh stack with the same name. This used to work - part of a script running in 
a different stack to the one being deleted:

  set the cantDelete of stack "myDataStack" to false

  set the destroyStack of stack "myDataStack" to true

  set the destroyWindow of stack "myDataStack" to true

  close stack "myDataStack" -- this should ensure that there are no messages 
operating in that stack

  delete stack "myDataStack" -- this should remove it from memory
  
What happens in 8.1.1 rc2 (on a Mac with El Capitan, if that’s relevant) is 
that all goes well until the ‘delete’ command, when I get error 347, which is 
“stack locked, or object’s script executing”. Well, since the stack is closed 
(this is apparent on the screen), its scripts can’t be running, and it’s not 
locked (whatever that means - the dictionary is not helpful), I don’t think the 
error is the correct one.

The problem exists both in the IDE and in the standalone version of the program.

I have two problems tracking this down: 

(a) it used to work up to LC7.x; and 

(b) an attempt to abstract the issue by repeating it with some very simple 
stacks doesn’t demonstrate the error.

Can anyone suggest an approach to debugging this?  I am totally foxed.

TIA

Graham
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Re: Close and Delete a stack

Re: Close and Delete a stack

Re: Close and Delete a stack

Re: Close and Delete a stack

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Re: Close and Delete a stack

Close and Delete a stack

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