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Determining existence of an object
Message
From
09/08/1999 22:17:21
 
 
General information
Forum:
Visual FoxPro
Category:
Classes - VCX
Miscellaneous
Thread ID:
00251780
Message ID:
00251853
Views:
12
Right you are. I was surpirised to find out this is true. Still learnin'.

>It was my understanding that VARTYPE would only pass an 'O' if the variable was a living object. If VARTYPE were to classify a dead object it would return an 'X' because the variable was NULL.
>
>Glenn
>
>>I am sure you know John, but hust to clarify-
>>
>>the test below will determine if the variable named oMyObject is of the object type, but does not test to see if it actually references a living object. To do that, you either need to check the type of one of the object's properties (usually "name"), or, after testing the type, checking for ISNULL(oMyObject)
>>
>>>Hi Jim,
>>>
>>>IF VARTYPE(oMyObject) = "O" && It's an object
>>>IF VARTYPE(oMyObject) = "U" && It ain't nothing yet
>>>
>>>>I am using the addobject method to add an object to my form from a custom container class. Once it is created, how can test to see if it already exists?
>>>>
>>>>Thanks
>>>>Jim Oswald
>>>>joswald@innova.net
Erik Moore
Clientelligence
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