Author: Michael Glassman
Posted: 2016-11-22 at 14:34:56
Have you thought about passing your parameters in a single array, Gene?
That way you can test to see if you have received the correct number of
parameters using alen() and empty().
PROCEDURE TmpPrint
PARAMETERS laParams
liArray_Len = alen(laParams)
IF liArray_Len < min_param
* Too few parameters
ENDIF
IF liArray_Len > max_param
FOR i = max_param + 1 TO liArray_Len
IF !empty(laParams[i])
* Too many parameters
ENDIF
NEXT
* Just right!
This also circumvents the limit on the number of parameters that can be
passed.
Mike
-----Original Message-----
From: ProfoxTech [mailto:profoxtech-bounces@leafe.com] On Behalf Of Ted
Roche
Sent: Tuesday, November 22, 2016 12:57 PM
To: profoxtech@leafe.com
Subject: Re: Dealing with Extraneous Parameters
VFP, unlike some languages, is intolerant of excess parameters. To catch
this:
1. Use error handling in the CALLING program, not the CALLED program with
the Parameters statement, or
2. Write a very tolerant program that accepts all of the parameters you can
throw at it (varies by version) and throws an error after testing them with
PCOUNT().
(At one point, I know the number of parameters was 26, since that's the
number of red playing cards in a standard deck. But I think that limit was
raised in the most recent version, as your testing
indicates.)
On Tue, Nov 22, 2016 at 2:36 PM, Gene Wirchenko <genew@telus.net> wrote:
> At 10:34 2016-11-22, Gene Wirchenko <genew@telus.net> wrote:
>>
>> Hello:
>>
>> I am using VFP 9, but this may apply to many versions.
>>
>> I am testing a new printing subsystem. This will require
>> testing each report with a valid configuration and an invalid
>> configuration. I wrote a short, standalone program that tweaks the
configuration either way.
>> It is run with
>> <vfp>
>> do tmpprint with <number>
>> </vfp>
>>
>> I also wanted to check the parameters. If I do not specify a
>> parameter, that is an error and one easily caught with pcount().
>>
>> However, if there are more parameters than expected, an error 94
>> (Must specify additional parameters.) is thrown on the lparameters
>> statement. How do I catch this error considering that nothing gets
>> executed before the lparameters statement is looked at?
>>
>> It gets odder. Supposedly lparameters takes up to 26
>> parameters. I am now up to 40, and they all get assigned their specified
values.
>> Specifying a 41st parameter in the invocation throws an error 94.
>> Where does it end?
>
>
> Addendum: In this case, I could break the program up into two
programs:
> one the sets the valid configuration and one that sets an invalid
> configuration. Neither would require parameters. However, if a
> parameter is specified to a program without a [l]parameters statement,
> an error 1234 (No PARAMETER statement is found.) is thrown. (I note
> the typo in the error
> message: "PARAMETER" should be "PARAMETERS".)
>
> Sincerely,
>
> Gene Wirchenko
>
>
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