Ben
Yes, I agree, you in all circumstances should have all your
bases covered and have the variable defined before hand. I suppose
in this instance I would have to define it before the form was ever
brought into existence so there is no way the users actions can
bring the program to a halt...
I see the point you are making in not setting the var to NULL. Man,
this is such a simple concept, but will make a huge impact on how
I program from here on out. It never crossed my mind to try this..
THANK YOU, THANK YOU, THANK YOU...
I did some testing with this code:
SET VAR vm_startvar INTEGER = NULL
SHOW VAR
WRITE ' '
WRITE 'vm_startvar = ' .vm_startvar
WRITE '---------------------------'
SET VAR vm_startvar = 1122
SHOW VAR
WRITE ' '
WRITE 'vm_startvar = ' .vm_startvar
WRITE '---------------------------'
SET VAR vm_startvar INT
SHOW VAR
WRITE ' '
WRITE 'vm_startvar = ' .vm_startvar
WRITE '---------------------------'
WRITE ' '
WRITE 'xxxxxxxxxxxxxxxxxxxxxxxxxxx'
--and I see it. With this new weapon in the arsenal, I think
I will tell the RDCC to ignore my request. I can't think of a
circumstance that this wouldn't cover what I need and even
enhance a few situations... COOL.
Jim
--- Ben Petersen <[EMAIL PROTECTED]> wrote:
> Jim,
>
> If you you think about it, you either _need_ to have the var defined,
> or not... knowing if it is defined should really be irrelevant.
>
> So, for example, let's say you have a cmd file that is called by
> other command files, and further, let's say that the fact that a
> particular var is null determines flow in the cmd file being called.
>
> It would be most "proper" to define that var several thousand lines
> in advance, but, pragmatically speaking, you could define it as
> needed... even if it already exists.
>
> Set var vTestVar Text -- Notice I didn't set it to null
>
> If vTstVar is not null Then
> --do stuff
> else
> --do other stuff
> endif
>
> If vTstVar existed prior to this "as needed" definition, no harm done
> (it would still retain its values), and easier than testing for its
> existence and then defining if needed.
>
> Ben Petersen
>
>
>
> On 18 Feb 2002, at 5:08, Jim Limburg wrote:
>
> > Albert
> >
> > Interesting way do doing this, and of course it works. I was just
> > wishing for an easier way... although this would be farely fast.
> > Hmmm.. have to think about this. You and Tom's methods are two
> > ways that will work. I know that there are several places, and I
> > think this is where Manuel is coming from as well, that I have a
> > button/or eep or ?? that will define a variable within it's body
> > of code, but I don't test for this variable until the user has
> > done some other actions and I get into the module of code that
> > tests for all the users responces so far. Then when they preform
> > a certain action the action the code takes depends on this or
> > even several other actions they have taken..
> > I guess I could and probably should predefine the variable
> > farther upstream you might say in this sequence of events, but I
> > thought it would be a lot better to be able to query a function or
> > ??? to tell if the user has done some present actions before-hand.
> > In most of the languages I have used to date, they have some way to
> > test for objects by a boolean method or similar ways. I know Rbase
> > doesn't have a boolean datatype although I wish it had at times.
> > I guess I'm just for the most part a lazy coder... ha,ha.
> >
> > I did put in an request to the RDCC for this:
> >
> > SET VAR vm_vexists = (CVAL('variable','varname')) and this would return a
> text
> > value of '1' for true and '0' for false. Then a second part for the
> datatype if
> > possible like ... 'INTEGER' or 'TEXT' so the return would look like ...
> > 1,TEXT or 1,CURRENCY or 0,UNDEFINED
> >
> > Thanks
> > Jim
> >
> > --- Albert Berry <[EMAIL PROTECTED]> wrote:
> > > Here is one way to get a list of variables:
> > >
> > > OUTPUT TempFile.$$$
> > > SHOW VAR
> > > OUTPUT SCREEN
> > > CREATE TEMP TABLE VarList (VarName TEXT (18))
> > > LOAD VarList FROM TempFile.$$$ AS ASCII
> > > SELECT VarName FROM VarList
> > >
> > >
> > >
> > >
> > > Jim Limburg <[EMAIL PROTECTED]> wrote:
> > >
> > > >JM
> > > >
> > > >I don't know of a way either so I put in a request to the RDCC [1976]
> > > >Maybe If you and OTHERS do the same we can get our wish/dream
> > > >added before the next inline patch...
> > > >
> > > >hopefully
> > > >Jim Limburg
> > > >
> > > >--- "J.M. GRATIAS" <[EMAIL PROTECTED]> wrote:
> > > >>
> > > >> Hi all,
> > > >>
> > > >>
> > > >> I am looking for a way to check if a variable has been already
> defined.
> > > >>
> > > >> A way that don't display an error.
> > > >>
> > > >> Is there a function for that ?
> > > >>
> > > >> Or may be a tip ....
> > > >>
> > > >> TIA
> > > >>
> > > >>
> > > >> J.M. GRATIAS, Logimatique
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