See Re: VARTYPE vs TYPE with Parent property Thread #682266 Message #683269

>I have run into this problem with vartype() and properties which may contain object references or NULLs.
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>HackFox mentions that you shouldn't use vartype() to check for the existence of a variable, because it will crash with "variable not found." This is NOT my situation. I have checked that the property exists, now I'm trying to determine its type!
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>I have a class which usually appears on a page of a pageframe class with certain other pages. I want to check if I have that situation, then query certain properties on another page of the parent pageframe. (I know I just broke 3 or 4 OOP design rules.)
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>I test that pemstatus(this.parent, "parent", 5) = .T., so I know the property exists. Then I test vartype(this.parent.parent) to see whether it's an object (or NULL, presumably).
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>Instead of returning either "U" for undefined or "X" for null as I would expect, I CRASH with "Parent is not an object."
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>According to VFP docs <g>, and my past experience through VFP 6, vartype should return "U" if a variable/property is undefined, "X" if it's null, or the type (e.g. "O" if it's an object reference.)
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>Whazzup?