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How to Detect a Memory Variable's existence
Message
From
26/07/2007 13:14:20
Naomi Nosonovsky
Wisconsin, United States
 
General information
Forum:
Visual FoxPro
Category:
Other
Title:
Re: How to Detect a Memory Variable's existence
Environment versions
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Network:
Windows 2003 Server
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01243828
Message ID:
01243832
Views:
19
>How do you detect if a memory variable exists without causing a program to stop?

Use
vartype(myVar)<>'U'
Or use
type('MyVar') <> 'U'
for more complex cases, say, type('_screen.ActiveForm.name') = 'C' or type('myArr[1]') <> 'U' to check array's existance.
If it's not broken, fix it until it is.


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