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me.Invoke does not return any data

Posted on 2008-10-16
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Last Modified: 2013-11-18
I am using the following piece of code to invoke a web servive:

Dim results() As Object = Me.Invoke("OpGet", New Object() {Remote_Instance_ID})

but the results() object is returning as a null object.

I have tested whether the web service is working correctly using WireShark and have seen that the correct XML is being sent and received. But for some reason it is not being populated into this object.

I am completely stumped by this, please could someone help. I have a separate case open which is the same problem but poorly described, I will close this now.
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Question by:phil192
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LVL 96

Expert Comment

by:Bob Learned
ID: 22758139
What happens if you create an instance of a web service, and call the web method directly?
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Author Comment

by:phil192
ID: 22759040
Hi, thanks for your comment.

Yes, my first approach was to use the 'Add Web Reference' functionality in Visual Studio 2008 using the WSDL attached below.

Then I attempted to use the web service using the following code:

        Dim RemedyWS As New remedydev01.MMM_ESS_EquipmentSupportTicketService()
        Dim RemedyResponse As New remedydev01.TicketType()
        RemedyResponse = RemedyWS.OpGet(TextBox1.Text)

If an invalid parameter is used in the OpGet function then it returns an error from the webService, but if a valid parameter is used then a null object is returned.

It was in my debugging that I found that the root problem went back to the me.invoke call.

WSDL.txt
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LVL 96

Expert Comment

by:Bob Learned
ID: 22762942
What kind of web service is this, and is it under your control?  Does the web service have a test page?
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Author Comment

by:phil192
ID: 22767381
It's a web service that is configurable and comes with the BMC Remedy server.  It's API is that of Apache AXIS. I don't know any more than that I'm afraid but if there are specific questions that I need to answer to get to the bottom of this then I'm sure I can find out.

Many thanks, Phil
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LVL 96

Expert Comment

by:Bob Learned
ID: 22767405
Can you show me the XML that is returned for that web method call?
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Author Comment

by:phil192
ID: 22767718
Attached is a sample of XML data returned.
Returned-SOAP-Data-2.txt
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LVL 96

Expert Comment

by:Bob Learned
ID: 22767934
In that response, Remote_Instance_ID is blank:

<Remote_Instance_ID/>
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Author Comment

by:phil192
ID: 22768069
Yes it is, is that a problem?
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LVL 96

Expert Comment

by:Bob Learned
ID: 22768093
That would be my first inclination.  You might want to find out if there is a way to get a response that has a valid Remote_Instance_ID (that is not blank).
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Author Comment

by:phil192
ID: 22768549
I will try to get that changed in the web service, although I feel it is unlikely to be the issue because of the fact that the Invoke function returns a null object. Would it not just return an object with a null value for the Remote_Instance_ID field?
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Accepted Solution

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Bob Learned earned 500 total points
ID: 22768930
That is an assumption that you need to test.  You would have to determine what the arguments are to the web method that would give you a non-blank Remote_Instance_ID.
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Author Comment

by:phil192
ID: 22769558
Ok I understand. I'll get the web service changed and test it further. It may take a few days but I'll let you know when I've done it.

Thanks for your help so far.

Phil
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Author Comment

by:phil192
ID: 22904051
Sorry for the delay, unfortunately the web service is not something I have direct control over so I'm still waiting for this to be completed. Thanks for your patience. Phil
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Author Closing Comment

by:phil192
ID: 31506806
Thanks for your help TheLearnedOne, I'm going to close this question now as its been a long time since first opening it. If the problem still exists then I will reraise it as an issue.
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