POP.SESSION [Revelation On-Line Wiki]

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====== POP.SESSION=====

^Published By^Date^Version^Knowledge Level^Keywords^
|Revelation Technologies|14 NOV 1989|2.X|EXPERT|POP.SESSION|

POP.SESSION is a subroutine that restores the environment 
parameters saved by a preceding call to PUSH.SESSION.

<code>
POP.SESSION(cursor.loc, sentence, record, id, dict, mv)
</code>

==== Using POP.SESSION ====

Use POP.SESSION to restore an environment after use of 
PUSH.SESSION.  The saved values are passed from the 
PUSH.SESSION argument list.

=== cursor.loc ===

Use cursor.loc to pass the cursor position saved by 
PUSH.SESSION.

=== sentence ===

Use sentence to pass the TCL sentence saved by 
PUSH.SESSION.

=== record ===

Use record to pass the record saved by PUSH.SESSION

=== id ===

Use id to pass the record key saved by PUSH.SESSION.

=== dict ===

Use dict to pass the dictionary variable saved by 
PUSH.SESSION.

=== mv ===

Use mv to pass the array of @MV, @INSERT (see Appendix 1, 
"System Variables"), and video attributes saved by 
PUSH.SESSION.

==== Values returned ====

None.


==== Correct Use of POP.SESSION ====

<code>
* The following code restores an environment preserved by PUSH.SESSION

DECLARE SUBROUTINE PUSH.SESSION, POP.SESSION, MSG

PUSH.SESSION(cursor, sentence, record, id, dict, mv)

* Call a subroutine that modifies environment parameters.

GOSUB change.environ

text     = "The modified values are:"
text<<-1>> = "SENTENCE is ":@SENTENCE
text<<-1>> = "RECORD is ":@RECORD
text<<-1>> = "ID is ":@ID

MSG(text, "", "", "")

POP.SESSION(cursor, sentence, record, id, dict, mv)

text     = "The restored values are:"
text<<-1>> = "SENTENCE is ":@SENTENCE
text<<-1>> = "RECORD is ":@RECORD
text<<-1>> = "ID is ":@ID

MSG(text, "", "", "")

STOP

/* Assign sample values to system variables referenced by 
the environment parameters */

change.environ:

@@SENTENCE = "SELECT SAMPLE.FILE BY ST BY ZIP"
@@RECORD   = "SAMPLE"
@@ID       = "SAMPLE.ID"

RETURN
</code>