How do I process XML in Visual Basic?

[TXShooter]

I've tried, and I've tried, and I've tried... I just can't seem to get a handle on parsing an XML stream from a device. It should be simple, but I MUST be missing something. All I want to do is to display the variables in the XML stream, and the values to those variables, in Me.Labelx.Text format so that my form looks like:

input1state = 0
input2state = 0
input3state = 0
input4state = 0
input5state = 0

Can anyone help me out here?

Imports System.Net.Sockets
Imports System.Text
Imports System.Xml
Imports System.IO
Imports System.Net
Imports System.Xml.Xsl
 
 
Public Class ControlByWebTester_Form
  Private Sub Read_DAQ()
    Dim tcpClient As New System.Net.Sockets.TcpClient()
    Dim port As Integer
    Dim ipAddr As String = Convert.ToString(IPAddr_TextBox.Text)
 
    Try
      'Connect to DAQ
      port = Convert.ToInt32(IPPort_TextBox.Text)
      tcpClient.Connect(IPAddr_TextBox.Text.ToString(), port)
 
      If tcpClient.Connected Then
 
        Me.Pwr_Picturebox.Image = My.Resources.Red_LED___On
 
        'Create a network stream object
        Dim netStream As NetworkStream = tcpClient.GetStream()
 
        'If we can read and write to the stream then do so
        If netStream.CanWrite And netStream.CanRead Then
 
          'Send the on command to read status of DAQ
          Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes("GET /state.xml?noReply=0 HTTP/1.1" & vbCrLf & vbCrLf)
          netStream.Write(sendBytes, 0, sendBytes.Length)
 
          'Get the response from DAQ
          Dim bytes(tcpClient.ReceiveBufferSize) As Byte
          netStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
 
          'Parse the response
          Dim returndata As String = Encoding.ASCII.GetString(bytes)
 
          'Parse out the DAQ state
          Dim array1 As Char() = returndata.ToCharArray()    'Used by different part of sub not shown
          Dim source As Char() = array1
          'The Stream's String contains (without whitespaces):
          '<datavalues>
          '  <input1state>0<input1state/>
          '  <input2state>0<input2state/>
          '  <input3state>0<input3state/>
          '  <input4state>0<input4state/>
          '  <input5state>0<input5state/>
          '  <count1>0</count1>
          '  <count2>0</count2>
          '  <count3>0</count3>
          '  <count4>0</count4>
          '  <count5>0</count5>
          '  <powerupflag>1</powerupflag>
          '</datavalues>
          Dim LabelString As String = " "
          Dim DAQDoc As New XmlDocument
          Dim DAQNodes As XmlNodeList
          Dim DAQNode As XmlNode
          DAQDoc.LoadXml(source)
          DAQNodes = DAQDoc.GetElementsByTagName("datavalues")
          For Each DAQNode In DAQNodes
            Dim baseDAQNodes As XmlNodeList
            Dim bFirstInRow As Boolean
            baseDAQNodes = DAQNode.ChildNodes
            bFirstInRow = True
            For Each baseDAQNode As XmlNode In DAQNodes
              LabelString = LabelString + (baseDAQNode.Name & ": " & baseDAQNode.InnerText) + vbCr & vbLf
            Next
          Next
 
          'Display the Variables and Values from the XML string, 
          Me.Label1.Text = LabelString
 
        End If
 
        'Close the connection
        tcpClient.Close()
 
      End If
 
    Catch e As Exception
      Me.Label1.Text = "An error has occurred."
      'Disable the timer
      Timer1.Enabled = False
    End Try
  End Sub
 
  Private Indicator As Long = 0
 
  Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
 
    Read_DAQ()
    Me.Label2.Text = "Reading DAQ#1"
 
  End Sub
 
  Private Sub DAQ1_Start_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DAQ1_Start_Button.Click
 
    Timer1.Enabled = True
    Timer1.Interval = 250
    Me.Label2.Enabled = True
    DAQ1_Start_Button.Enabled = False
    DAQ1_Stop_Button.Enabled = True
    IPAddr_TextBox.Enabled = False
    IPPort_TextBox.Enabled = False
 
  End Sub
 
  Private Sub DAQ1_Stop_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DAQ1_Stop_Button.Click
 
    IPAddr_TextBox.Enabled = True
    IPPort_TextBox.Enabled = True
    Me.Label2.Enabled = False
    DAQ1_Start_Button.Enabled = True
    DAQ1_Stop_Button.Enabled = False
    Timer1.Stop()
 
  End Sub
 
End Class
 

I've asked for help on this before, but perhaps no one realized what it was that I was asking for??? I've gotten no answers to it other than, "Put code in code blocks." So, I ask it again with a cleaner looking code setup.

[Rabbit]

If you have verified that array1 is returning correctly, then the problem is most likely line 69. It should probably be this:

For Each baseDAQNode As XmlNode In baseDAQNodes 

But it's hard to say because you haven't actually described what the problem is, only that it's not working.

[TXShooter]

Holy C**p, Rabbit, that did it!

"source" contained the entire xml 'file' in a streaming string.

The problem was that "datavalues: 10000000001" was my output instead of "input1state: 0" (etc.). I needed to break down the string into appropriate variable/value segments.

However, it would seem that I'll need to go a completely different direction with my XML programming in order to process other devices. I'll need to figure out how to traverse from top-to-bottom the entire tree, get/store the variable names, and their values, from a program point of view. It would seem unwise to write a custom program just for the sake of reading each device I have.

Thank you very much, Rabbit. :)

[Rabbit]

Not a problem, good luck with your project.