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Save to an xml file every 5mins and check for value

Posted on 2007-11-23
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Last Modified: 2010-04-30
I have a url that seems to return me a XML file. I need to save it to a file so I can process it.

Then I need to check for a certain value for a element node every 5mins (quantity). Sometimes the node will be there, sometimes it will not. Is it possible to be done?
I need the item to be sold by amazon.com only not 3rd party merchants

http://webservices.amazon.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=1VZB58STNG3MCXSMS8G2&Operation=ItemLookup&ItemId=B000UA0LXQ&ResponseGroup=OfferFull&Version=2007-10-29&DeliveryMethod=Ship&Condition=New&IdType=ASIN
 

For some reason it returns -1

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Question by:Sharalynn
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PaulHews earned 500 total points
ID: 20340085
Using a timer...  I'm not sure it's necessary to save to a file, but I show how.  Also, how to extract a single node.
Imports System.Xml

Public Class Form1
 

   
 

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Timer1.Interval = 300000 ' 5min

        Timer1.Enabled = True

    End Sub
 

    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        Dim doc As New XmlDocument

        doc.Load("http://webservices.amazon.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=1VZB58STNG3MCXSMS8G2&Operation=ItemLookup&ItemId=B000UA0LXQ&ResponseGroup=OfferFull&Version=2007-10-29&DeliveryMethod=Ship&Condition=New&IdType=ASIN")

        Dim nsMgr As New XmlNamespaceManager(doc.NameTable)

        nsMgr.AddNamespace("ns", "http://webservices.amazon.com/AWSECommerceService/2007-10-29")

        doc.Save("C:\items.xml")  'Save file?
 

        Dim node As XmlNode = doc.DocumentElement.SelectSingleNode("//ns:Amount", nsMgr)

        If Not node Is Nothing Then

            Debug.WriteLine(node.InnerText)

        End If
 

    End Sub
 

  

End Class

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Author Comment

by:Sharalynn
ID: 20342246
This is almost perfect! Thank you! But you said that there is no need to save it to a file and I see why... it kind of auto save the stuff into a object already upon retrieving from the link. But still, useful, thank you.
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Author Closing Comment

by:Sharalynn
ID: 31410674
save http link to xml file
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