variable scope

[dik_coleman]

Let's hope that this is a simple question.....
I am having trouble visualizing (or understanding) the scope 'session'. The book says "A window is open"......
How is a 'window' opened or closed????????
I understand the changing of layouts (forms or browses).

D

[forskare]

RE: variable scope

You can either use Xbasic or action scription to create a script or action to open a form and /or close the form.


kenn

[Mario Prieto]

RE: variable scope

If you are talking about global variables the session means the actual A5 program open used (It could be the Runtime or the Actual A5) to run the program on which the global variable was declare.

if you are talking about regular variables they only survive until the script, form, browse in which it was declare.

So think of session as the object(Form, script, browse) in which you declared the variable. except in the case of global variables where the session means the A5 program itself.

If you have been dealing with Xdialog for a while here is the Pseudocode to my answer.

if reg_variable then
session=object_declared_in
else
reg_variable=global
session=:A5
end if

Lately I have been talking Pseudocode to anyone, my wife already told me:

if Mexican=Pseudocode then
script_play(wife_gone)
end if

Have a nice one

The Mexican

[dik_coleman]

RE: variable scope

No problem with the forms, just the definition of the variable scope 'session'. When does a 'session variable' disappear??

D

[dik_coleman]

RE: variable scope

OK then how does a 'local' variable differ from a 'session' variable???
D

[forskare]

RE: variable scope

From the Xbasic reference manual:

A Session variable is visible to a form and all sub-forms and sub-browses in that form. A Layout variable is only visible on the form for which it is defined. For example, a layoutvariable defined on a form that is used as a sub-form is not visible to the parent form. A Session variable used on the sub-form is visible to the parent form.

A form can refer to another form�s Layout or Shared variables by first getting a pointer to the variables. See "Getting a Pointer to Variables in another Namespace" below for details.
=====================================

Declaring Local Variables

A variable that is implicitly declared in a script is valid only while the script is running. When the script is done, the variable disappears and is not available to other scripts or other parts of an application (unless the script that creates the variables is executed using the
script_play_local() function). Variables of this sort are called local variables because they are restricted to the context in which they are defined. Variables implicitly declared within a user32 Alpha Five Xbasic Reference Manual
defined function, or declared as function parameters, are also local variables. These variables are available to only the function, and are destroyed when the function is completed.

kenn

[dik_coleman]

RE: variable scope

Thanx Kenn--
The area you quoted was 'just below' the place I stopped while pondering the 'scope' of things...
If I had continued reading, I would have seen the description and it might have helped..

Again
Thanx
D