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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Apr 8, 1999

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On-Demand

Application Security Testing: An Integral Part of DevOps


Don't Use VarType to Test for Objects

To test whether an argument passed to a procedure is an object or something else, use the IsObject function in place of the VarType function. Consider this routine:
 
Sub TestType(arg As Variant)
	If VarType(arg) = vbObject Then
		Print "It's an object"
	ElseIf VarType(arg) = vbString Then
		Print "It's a string"
	End If
End Sub
If you pass a control or an object that exposes a default property, the routine incorrectly reports the default property type:
 
TestType Text1	' displays "It's a string"
This is the correct way to test for an object:
 
	If IsObject(arg) Then
		Print "It's an object"
	ElseIf VarType(arg) = vbString Then
		Print "It's a string"
	End If
For more information on this topic, look on VB's Help file under "VarType."
Francesco Balena
 
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