XmlDocument Trouble

[Roshawn Dawson]

Hi,

I don't know why, but I can't seem to get this to work:

Public Sub DoSomething()
Dim sb as New StringBuilder()
sb.Append("http://webservices.amazon.com/onca/xml?")
sb.Append("Service=AWSECommerceService&Subscriptio nId")
sb.Append("=0525E2PQ81DD7ZTWTK82&Operation=ItemSea rch")
sb.Append("&SearchIndex=Books&Keywords=css")
sb.Append("&ResponseGroup=ItemAttributes,Offers")
Dim tr as New XmlTextReader(sb.ToString())
tr.Read()
Dim xDoc as XmlDocument = New XmlDocument()
xDoc.Load(tr)
tr.Close()
Dim oNodeList as XmlNodeList =
xDoc.SelectNodes("/ItemSearchResponse/Items/Item")
Me.Items.Text = oNodeList.Count.ToString()
'xDoc.Save("C:\myfile.xml")
End Sub

To be on the safe side, I even saved the returned xml file just to see
if I was actually receiving a file. All is well on that part. Try as I
may, the oNodeList object always returns 0. Why?

This example seems simple enough, but I'm now pulling hairs off my chest
trying to get it working.

Could someone tell me where the problem is?

Thanks,
Roshawn

[Martin Honnen]

Roshawn Dawson wrote:

I don't know why, but I can't seem to get this to work:

Public Sub DoSomething()
Dim sb as New StringBuilder()
sb.Append("http://webservices.amazon.com/onca/xml?")
sb.Append("Service=AWSECommerceService&Subscriptio nId")
sb.Append("=0525E2PQ81DD7ZTWTK82&Operation=ItemSea rch")
sb.Append("&SearchIndex=Books&Keywords=css")
sb.Append("&ResponseGroup=ItemAttributes,Offers")
Dim tr as New XmlTextReader(sb.ToString())
tr.Read()
Dim xDoc as XmlDocument = New XmlDocument()
xDoc.Load(tr)
tr.Close()
Dim oNodeList as XmlNodeList =
xDoc.SelectNodes("/ItemSearchResponse/Items/Item")
Me.Items.Text = oNodeList.Count.ToString()
'xDoc.Save("C:\myfile.xml")
End Sub

To be on the safe side, I even saved the returned xml file just to see
if I was actually receiving a file. All is well on that part. Try as I
may, the oNodeList object always returns 0. Why?

How does the XML look? Does it contain namespaces so that you would need
a NamespaceManager with SelectNodes?

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Roshawn Dawson]

Hi Martin,

Yes, it has a namespace. I wrote the following code to handle that issue:

Dim nmngr As XmlNamespaceManager = New XmlNamespaceManager(xmlDoc.NameTable)
nmngr.AddNamespace(String.Empty,
"http://webservices.amazon.com/AWSECommerceService/2005-03-23")

However, I may not be using it correctly. Should I do something like this:

oNodeList = xDoc.SelectNodes("/ItemSearchResponse/Items/Item", nmngr)

If so, I still get the same results as before

Thanks,
Roshawn

Martin Honnen wrote:

How does the XML look? Does it contain namespaces so that you would need
a NamespaceManager with SelectNodes?

[Martin Honnen]

Roshawn Dawson wrote:

Yes, it has a namespace. I wrote the following code to handle that issue:

Dim nmngr As XmlNamespaceManager = New
XmlNamespaceManager(xmlDoc.NameTable)
nmngr.AddNamespace(String.Empty,
"http://webservices.amazon.com/AWSECommerceService/2005-03-23")

However, I may not be using it correctly. Should I do something like this:

oNodeList = xDoc.SelectNodes("/ItemSearchResponse/Items/Item", nmngr)

If so, I still get the same results as before

If it is a default namespaces (e.g.
xmlns="http://webservices.amazon.com/AWSECommerceService/2005-03-23")
then you need to bind a prefix to that namespace, see
<http://www.faqts.com/knowledge_base/view.phtml/aid/34022/fid/616>

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Roshawn Dawson]

Thanks for the input, that helps tremendously!!

Roshawn
Martin Honnen wrote:

If it is a default namespaces (e.g.
xmlns="http://webservices.amazon.com/AWSECommerceService/2005-03-23")
then you need to bind a prefix to that namespace, see
<http://www.faqts.com/knowledge_base/view.phtml/aid/34022/fid/616>