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Vartype with tables
Message
From
26/12/2007 09:42:37
 
 
To
26/12/2007 09:17:39
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Miscellaneous
Thread ID:
01277433
Message ID:
01277497
Views:
20
>>I can use type for if there is a field in table:
>>
>>
?type("mytable.myfield")="U"
>>
>>but with vartype
>>
>>
?vartype("mytable.myfield")="U"
>>
>>is generates variable not found. Isn't that a bug?
>
>Here's what we said in HackFox about this:
>
>"Because VARTYPE() explicitly passes the expression to test as a parameter, it fails if an expression cannot be evaluated, causing an error 12, "Variable not found"—you'll still want to use TYPE() to check if a variable exists."
>
>Tamar

hi Tamar,

That is not exactly true
?vartype(tamar) && U

obj = createobject('relation')
?vartype(obj.tamar) && U
?vartype(obj.BackColor) && U

&& Existing properties that are being hidden/protected generate an error
?vartype(obj.left) && Error, as with top, height, width

obj = createobject('www')
?vartype(obj.qqq)  && error


define class www as relation
	protected qqq
	qqq = 0
enddefine
Gregory
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