I ran into this problem with global variables about two weeks ago when I
was trying to write a nice little program to run sql queries to any
database connection (as opposed to using sqlplus for oracle isql_w for
ms-sql etc...). It does seem contradictory to basic programming to use
global variables for most of your code. I read all the replies and
realized that I'm still a newbie when it comes to programming especially in
PERL, I have no idea what a singleton is.
What I did was create the windows in separate subroutines and then used
semiprivate variables using local instead of my. Since the window was
created in the subroutine all the variables are only defined in the scope
of the that subroutine and any other subroutines called from it, such as
Window_Click(). Once the program exits that subroutine all the variables
are dropped so I don't waste any memory which I would if they were global
and I can use the variables with the same name in any other subroutine.
Also I think that the use of semiprivate variables will not cause any
warning or errors if you have "use strict". I'm not sure though.
This might not be the best way of getting around the problem but it works
for me and my limited skills so I thought I would mention it. If I'm wrong
on any of this or have made things worse with my approach let me know. I
will be happy to post my code of the program I am working on if anyone
wants to see it, just remember I'm still working on it so it's not perfect
and I still have to make several changes (it's only been two weeks) but it
will show you what I am doing.
Joe
Mark Wilkinson <[EMAIL PROTECTED]>@lists.sourceforge.net on 11/03/2001
07:31:12 PM
Please respond to [EMAIL PROTECTED]
Sent by: [EMAIL PROTECTED]
To:
cc: perl-win32-gui-users@lists.sourceforge.net (bcc: Joseph
Vieira/DMR/CA)
Subject: [perl-win32-gui-users] ACK!! Sputter Cough... say it isn't so!
Someone please... save me before I choke! Please say it isn't so!!
Tonight I really started to build a serious heavy-duty Win32::GUI
application, and I immediately hit a wall:
Is it really not possible to (usefully) program in Win32::GUI while under
"use strict"?!? I say this because there appears to be **nothing** passed
to the event-handling subroutines - not even a reference to the widget
itself! This, IMHO, is absolutely insane! That means that all of my
widget refs, and every variable that is required in the event-handling
subroutines, have to be global variables... which would make comp-sci
professors roll over in their future graves... a "good" program should
never need to have a *single* global variable, let alone *every* variable
being global. If even the widget ref was sent to the event-handler I could
attach the subroutine's required variables to its hash, but as things are
it seems to break every rule I know about "good" programming style.
I must be missing something... Please, someone, tell me that it doesn't
really work this way...
Mark
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