Parsing XML from a XmlDocument

[MrMancunian]

Hi,

I've created an HTTP connection with a server. I send a WebRequest in XML to the server (see strReq in code) and it returns me a WebResponse. This response is inserted in a string, which is then loaded into a XmlDocument. How can I parse this XmlDocument? I tried a few things, but I didn't get it to work. The output which is in de XmlDocument is like this:

<?xml version="1.0" encoding="iso-8859-1" ?>
<antwoord type="ack">T08-13995</antwoord>

I need the piece of code that is on the second line between <antwoord> and </antwoord>. Does anyone have an idea on how to go about that?

Below is the code I use for the WebRequest and the WebResponse:

 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim sp_response As XmlDocument = New XmlDocument()
        Dim strReq, strRsp, url As String
        Dim httpReq As HttpWebRequest
        Dim httpRsp As HttpWebResponse
        Dim streamReq, streamRsp As Stream
        Dim sw As StreamWriter
        Dim sr As StreamReader
        url = "http://..."
        Try
            httpReq = WebRequest.Create(url)
            httpReq.Method = "POST"
            httpReq.KeepAlive = False
            httpReq.UserAgent = Nothing
            httpReq.ContentType = "text/xml"

            streamReq = httpReq.GetRequestStream
            sw = New StreamWriter(streamReq)
            strReq = "<?xml version='1.0' encoding='UTF-8'?><lmsvraag nummer='464312'/>"
            sw.Write(strReq)
            sw.Close()
            httpRsp = httpReq.GetResponse
            streamRsp = httpRsp.GetResponseStream
            sr = New StreamReader(streamRsp)
            strRsp = sr.ReadToEnd
            httpRsp.Close()
            sp_response.LoadXml(strRsp)
            Debug.WriteLine(strRsp)
        Catch ex As Exception
            Debug.WriteLine("EXCEPTION")
            Debug.WriteLine("Error #" + ex.Message)
            Debug.WriteLine("Error reported by " + ex.Source)
        End Try
    End Sub

Thnx for your help in advance!

Cheers,

Steven

[shweta123]

Hi ,

You can try the following code in the code that you have written:
e.g.

 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim sp_response As XmlDocument = New XmlDocument()
        Dim strReq, strRsp, url As String
        Dim httpReq As HttpWebRequest
        Dim httpRsp As HttpWebResponse
        Dim streamReq, streamRsp As Stream
        Dim sw As StreamWriter
        Dim sr As StreamReader
        url = "http://..."
        Try
            httpReq = WebRequest.Create(url)
            httpReq.Method = "POST"
            httpReq.KeepAlive = False
            httpReq.UserAgent = Nothing
            httpReq.ContentType = "text/xml"

            streamReq = httpReq.GetRequestStream
            sw = New StreamWriter(streamReq)
            strReq = "<?xml version='1.0' encoding='UTF-8'?><lmsvraag nummer='464312'/>"
            sw.Write(strReq)
            sw.Close()
            httpRsp =      httpReq.GetResponse
            streamRsp =  httpRsp.GetResponseStream
            sr =  New StreamReader(streamRsp)
            strRsp = sr.ReadToEnd
            httpRsp.Close()
            sp_response.LoadXml(strRsp)


            [B]'' Process xml from xmldocument '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 
            
            Dim xmlNodeList As XmlNodeList
          
              ''Get the xmlNodeList with the name as "antwoord"
           
              xmlNodeList = _doc.GetElementsByTagName("antwoord")


             For index As Integer = 0 To xmlNodeList.Count - 1
                ''Get the value of each selected node
               MsgBox(xmlNodeList.Item(index).InnerText)
            Next[/B] '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''           
  
            Debug.WriteLine(strRsp)
        Catch ex As Exception
            Debug.WriteLine("EXCEPTION")
            Debug.WriteLine("Error #" + ex.Message)
            Debug.WriteLine("Error reported by " + ex.Source)
        End Try
    End Sub

[MrMancunian]

Hi, thanks a lot, works like charm! Now something else:

The response by the server is, like I said, as follows:

<?xml version="1.0" encoding="iso-8859-1" ?>
<antwoord type="ack">T08-13995</antwoord>

The type in the Antwoord-node can be either "ack", as shown above, or it can be "error". Is there any way to check what the value of the type is?

Thnx,

Steven

[MrMancunian]

Has anyone got an idea on my last question?

Thnx in advance,

Steven