?
Solved

me.Invoke does not return any data

Posted on 2008-10-16
16
Medium Priority
?
1,111 Views
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.
0
Comment
Question by:phil192
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 8
  • 6
16 Comments
 
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?
0
 

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
0
 
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?
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

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
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 22767405
Can you show me the XML that is returned for that web method call?
0
 

Author Comment

by:phil192
ID: 22767718
Attached is a sample of XML data returned.
Returned-SOAP-Data-2.txt
0
 
LVL 96

Expert Comment

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

<Remote_Instance_ID/>
0
 

Author Comment

by:phil192
ID: 22768069
Yes it is, is that a problem?
0
 
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).
0
 

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?
0
 
LVL 96

Accepted Solution

by:
Bob Learned earned 1500 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.
0
 

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
0
 

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
0
 

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.
0

Featured Post

Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Shoutout to Emily Plummer (http://www.experts-exchange.com/members/eplummer26.html) for giving me this article! She did most of it, I just finished it up and posted it for her :)    Introduction In a previous article (http://www.experts-exchang…
I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX. The logical flow for the problem should be: Write an event handler for the first drop down box to get …
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
Suggested Courses

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question