By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings.
449,219 Members | 1,741 Online
Bytes IT Community
+ Ask a Question
Need help? Post your question and get tips & solutions from a community of 449,219 IT Pros & Developers. It's quick & easy.

Reading XML file getting error

P: n/a
I'm new to XML files so I'm kinda lost here. I found some example code
on reading an XML file.

My objective is simple. Read the whole XML file into memory.

Here is part of my code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim query As String
Dim Node As XmlNode
Dim sReturnedValue As String

'Add any initialization after the InitializeComponent() call
configFileName = "i:\rpg\configs\config2.xml"
document = New XmlDocument
document.Load(configFileName)

query = "descendant::company[@id='dmo']"
Node = document.DocumentElement.SelectSingleNode(query)
'("descendant::book[@bk:ISBN='1-861001-57-6']", nsmgr)
If Not Node Is Nothing Then
sReturnedValue = Node.Attributes.GetNamedItem("value").Value

Else
MsgBox("Could not find node" & LookFor & " in config file")
End If

End Sub

Here is the error I am getting when I get to the RED line in my code:

An unhandled exception of type 'System.NullReferenceException' occurred
in XML Test.exe

Additional information: Object reference not set to an instance of an
object.

My XML File looks like this:

<?xml version="1.0"?>
<config>
<company id="dmo">
<DefaultBranch>"02"</DefaultBranch>
<TruckSystemType>"MS"</TruckSystemType>
<TruckSystemDataDrive>"D:"</TruckSystemDataDrive>
<CompaniesOnSystem>"3"</CompaniesOnSystem>
<SalesAndServicePrinter>"P1"</SalesAndServicePrinter>
<DeliveryTicketPrinter>"P2"</DeliveryTicketPrinter>
<CounterReceiptPrinter>"P3"</CounterReceiptPrinter>
<TypeTapeBackup>"PKZ"</TypeTapeBackup>
<StatementForm>"Y"</StatementForm>
<OnePartForm>"0000"</OnePartForm>
<TwoPartForm>"0001"</TwoPartForm>
<RemotePath>"i:\rpg"</RemotePath>
<LocalPath>"c:\rpg"</LocalPath>
<CompanyEmailAddress>"te**@ss.com"</CompanyEmailAddress>
<DefaultUserName>"Master"</DefaultUserName>
<DefaultWorkstationID>"AA"</DefaultWorkstationID>
<RpgStartUpFile>"c:\rpg\gas\aastart.p"</RpgStartUpFile>
</company>
</config>

Any ideas what I am doing wrong?

Thanks!
Eroc

Jun 14 '06 #1
Share this Question
Share on Google+
3 Replies


P: n/a

Eroc wrote:
I'm new to XML files so I'm kinda lost here. I found some example code
on reading an XML file.

My objective is simple. Read the whole XML file into memory.

Here is part of my code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim query As String
Dim Node As XmlNode
Dim sReturnedValue As String

'Add any initialization after the InitializeComponent() call
configFileName = "i:\rpg\configs\config2.xml"
document = New XmlDocument
document.Load(configFileName)

query = "descendant::company[@id='dmo']"
Node = document.DocumentElement.SelectSingleNode(query)
'("descendant::book[@bk:ISBN='1-861001-57-6']", nsmgr)
This appears to be part of the problem. Looks like you have the code
from the sample still referencing the book:ISBN, and your XML file does
not contain that node name.

I prefer parsing XML using the XMLSerializer class. Leaves all values
in nice convenient properties.


If Not Node Is Nothing Then
sReturnedValue = Node.Attributes.GetNamedItem("value").Value

Else
MsgBox("Could not find node" & LookFor & " in config file")
End If

End Sub

Here is the error I am getting when I get to the RED line in my code:

An unhandled exception of type 'System.NullReferenceException' occurred
in XML Test.exe

Additional information: Object reference not set to an instance of an
object.

My XML File looks like this:

<?xml version="1.0"?>
<config>
<company id="dmo">
<DefaultBranch>"02"</DefaultBranch>
<TruckSystemType>"MS"</TruckSystemType>
<TruckSystemDataDrive>"D:"</TruckSystemDataDrive>
<CompaniesOnSystem>"3"</CompaniesOnSystem>
<SalesAndServicePrinter>"P1"</SalesAndServicePrinter>
<DeliveryTicketPrinter>"P2"</DeliveryTicketPrinter>
<CounterReceiptPrinter>"P3"</CounterReceiptPrinter>
<TypeTapeBackup>"PKZ"</TypeTapeBackup>
<StatementForm>"Y"</StatementForm>
<OnePartForm>"0000"</OnePartForm>
<TwoPartForm>"0001"</TwoPartForm>
<RemotePath>"i:\rpg"</RemotePath>
<LocalPath>"c:\rpg"</LocalPath>
<CompanyEmailAddress>"te**@ss.com"</CompanyEmailAddress>
<DefaultUserName>"Master"</DefaultUserName>
<DefaultWorkstationID>"AA"</DefaultWorkstationID>
<RpgStartUpFile>"c:\rpg\gas\aastart.p"</RpgStartUpFile>
</company>
</config>

Any ideas what I am doing wrong?

Thanks!
Eroc


Jun 14 '06 #2

P: n/a
Actually that line is commented out, I left it there to reference what
I was suppose to code.

Anyhow you said:

za***@construction-imaging.com wrote:
I prefer parsing XML using the XMLSerializer class. Leaves all values
in nice convenient properties.


How do I go about doing that? Any info you can point me to would be
greatly appreciated.

Thanks,
Eroc

Jun 14 '06 #3

P: n/a

Eroc wrote:
Actually that line is commented out, I left it there to reference what
I was suppose to code.
Sorry, I didn't noticed the comment quote with the small font on my pc.

Anyhow you said:

za***@construction-imaging.com wrote:
I prefer parsing XML using the XMLSerializer class. Leaves all values
in nice convenient properties.


How do I go about doing that? Any info you can point me to would be
greatly appreciated.


This might get you started:

http://support.microsoft.com/default...;EN-US;Q314150

Jun 14 '06 #4

This discussion thread is closed

Replies have been disabled for this discussion.