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Testing return results in MSXML4.0

Posted on 2002-06-26
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Last Modified: 2010-05-02
I'm using MSXML4.0 and have a question about testing the return value of some functions.  I'm using XPath as my selection langauges so I frequently attempt to retrieve nodes using:

    Dim Node As IXMLDOMNode

    node = XMLDoc.selectSingleNode("/foo/bar")

What I would like to do is test the value of the node to ensure it is valid before calling methods on it.  The documentation for selectSingleNode says the return value is Nothing if no node is found to match the XPath expression.  I tried the following:

    If Node = Nothing Then

but I got the following error:

    Compiler Error
    Invalid Use of Object

How can I test the validity of my object in this case?
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Question by:derekl
3 Comments
 
LVL 10

Expert Comment

by:GoodJun
ID: 7111699
may be try
If Node then
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LVL 26

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EDDYKT earned 100 total points
ID: 7111708
Dim Node As IXMLDOMNode

set node = XMLDoc.selectSingleNode("/foo/bar")

if not node is nothing then
  ' do something
endif
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Author Comment

by:derekl
ID: 7111929
Thanks.

I'm just curious why If Node doesn't work.  When I try that I get a "Object doesn't support method" error.  I'm thinking maybe a node doesn't support a conversion to boolean?
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