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Array Problem
Message
De
21/08/2013 12:32:16
Mike Yearwood
Toronto, Ontario, Canada
 
 
À
21/08/2013 12:20:57
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Titre:
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP3
Network:
Windows 2003 Server
Database:
Visual FoxPro
Application:
Desktop
Divers
Thread ID:
01580886
Message ID:
01580905
Vues:
50
>>>Hi Gang!
>>>
>>>My fellow colleague at work has this problem. He has this in some code
>>>
>>>
>>>PROCEDURE getArrayElement
>>>      PARAMETERS lnElement
>>>      pcTheData = laWarnLbl[lnElement]
>>>      RETURN pcTheData
>>>ENDPROC
>>>
>>>
>>>The above snippet of code is giving me the “invalid subscript reference” error on the “pcTheData = laWarnLbl[lnElement] line.
>>>
>>>The value of lnElement at this point is 1.
>>>
>>>And laWrnLbl is dimensioned to 6.
>>>
>>>Thanks
>>
>>If you have a field called lnElement in the active table, and it has a value greater than 6, you will get this error. I strongly advise you to alter this routine so that it uses LPARAMETERS. It should receive the array as a parameter too. It should declare pcTheData LOCAL or not even use pcTheData at all. I'd write it this way.
>>
>>
getArrayElement.prg
>>LPARAMETERS lnElement,taArray
>>EXTERNAL ARRAY taArray && prevents compiler error.
>>RETURN taArray[m.lnElement]
>>
>>and I'd call it like this
>>
?GetArrayElement(5,@laWarnLbl)
>
>This will probably answer Dimitry's question, but I have another question - why call a one-line procedure?

1 - standardization, 2 - expansion, 3 - a single point of maintenance, 4 - readability.
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