variables in VB

Gavin

Hi,
I have a form that takes input from a user and assigns it a variable. When i wish to access this variable from another form, it just appears as zero ? I have declared the variable as public and am lost !?!?! I am using VB6. Any ideas ?

Gav

DeVore

You will have to declare the variable in a module not in the form declarations area.
Also , try declaring it as Global so that all forms can see it.

Also, consider using Option Explicit in your forms (in the general area I think) or setting it in the Options dialog (I dunno about VB6). That way instead of seeing "0" as the value you will get an error that the variable hasnt been declared (because its scope doesnt cover your second form).

Hope this helps.
DeV.

kayos

Ok one or two things here what DeVore said is complety right you should put it into a module file and you should turn on the Option Explicit (in VB6 its Tools-> Options-> Editor -> Require Variablre Delcaration)
But do you really want to use globals ??? These are never really a good idea they look harmless enough but once you strart doing bigger projects they are a no no. Try creating a class based on the USER and then assign the varibles you take in to that as you go along VB is an OO language (ok here come all the c++/java heads saying no to this) so use as such. If you need to read up try Business Objects in VB6 by Wrox Press.

TypeOf Kayos is IUnkown

Trojan

Hi guys,

kinda OT, but I'm just interested in why there was ever an Option Explicit in the first place?

The only thing this does is give the newbie somewhere else to introduce errors, and ever self-respecting VB programming [and there aren't many ] that I know has this turned on.

Just curious if there's a good reason!

Al.

Shiminay

I reckon it started out as an internal joke in Micro$uck and they never bothered fixing it

---

All the best,

Dav
@B^)
http://homepage.eircom.net/~davitt

Hobbes

Originally posted by Trojan:
kinda OT, but I'm just interested in why there was ever an Option Explicit in the first place?

GWBASIC didn't have it afaik.

I'm pretty sure QBASIC 4.5 didn't have it either but QBASIC Professional did as did VBDOS.

So it was probably left out to let legacy code be ported across without hassle.

But they should set Option Explicit on by default otherwise you code becomes a complete mess.

Nothing funnier then switching on Option Explicit and then telling a developer to fix thier code.

As mentioned eariler you should also not be using Globals unless it's absolutly nessary. Normally if I had to do that it would only apply to program defaults (which I would save out to an INI).

koloth

VB6: Tools | Options | Editor and check Requie Variable Definition to switch on option explicit

kayos

koloth check out the third post its already in there thats not very OO of you cut and paste inhertance will not be acceptible
Just joking


KaYoS