KB-33937: Checking the contents of an IOTag property.

Question:

How can I check whether an XObject’s IOTag property is empty?

Solution:

To do so, you can use VBScript‘s IsNull method. This method returns TRUE if the variable has any type of value in it, and FALSE if it is empty.

Example of script:

If IsNull (property) Then
  MsgBox "there are tags"
Else
  MsgBox "empty"
End If
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