XML Exception When Using Xmltextreader To Read Webresponse And Then XmlDocument.load?
May 5, 2011
I am currently facing an issue when i get response from webservice, after reading response in response stream i want to load this response stream using xmltextreader. but when Load(xmlTextreaderObj) is called, it raises an exception displaying that "Root Element is Missing". Here is code which am using.
Dim wResp As HttpWebResponse = CType(wReq.GetResponse(), HttpWebResponse)
Dim respStream As StreamReader = New StreamReader(wResp.GetResponseStream())
Dim Resp As String = respStream.ReadToEnd()[code]....
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Dec 15, 2011
I'm trying to build a program updater based around downloading XML files from a server. The idea being that the servers XML file contains the current version number and installer location. the updater either gets dumped in the startup folder or gets installed as a service, etc. The program successfully reads and parses the current version xml file and it successfully downloads the xml file from the server.
However when I try to parse the newly downloaded file from the server I get the error:
'IOException was unhandled'
'The process cannot access the file 'C:Program Files (x86)TestServerVersion.xml' because it is being used by another process.'
The code is as follows with the error marked by a comment on line 52:
Imports System.IO
Imports System.Xml.XmlTextReader
Imports System.Net
Module Module1
[Code] .....
It's still work in progress but there's not much point in writing code to download and execute the installer if I can't work out the location of the new version. In case it's of use here is the XML:
<?xml version="1.0" encoding="UTF-8"?>
<VersionConfig>
<AvailableVersion>2.0.0.0</AvailableVersion>
<ApplicationUrl>http://192.168.2.226/EPI/2.0.0.0/</ApplicationUrl>
</VersionConfig>
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Mar 17, 2010
I'm trying to use an XmlTextReader to read simple XML data from a file I wrote using the XmlTextWriter class. I've very little experience with XML and reading/writing from it, so it's been a little struggle. The writing part went OK though, but I can't really figure out how to do the reading. All examples I found using google handled it all slightly differently, and none made it really clear what they were trying to read...I am storing the position, size and a filepath of MDI windows using this format:
xml
<?xml version="1.0"?>
<MDIForms>
<Form X="208" Y="95" W="424" H="277">C:UsersNickDesktopabc.plm</Form>
[code].....
obviously I cannot do what I want with this. I need to get the attributes in each element too, and I need to read multiple elements and do something for each element...
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Aug 31, 2011
I have working code to read an RSS feed that uses:
Dim doc As New XmlDocument
doc.Load("http://...")
Dim channel As XmlElement = doc("rss")("channel")
Dim items As XmlNodeList = channel.GetElementsByTagName("item")
Unfortunately the doc.Load call causes the rest of the program to become unresponsive until it finishes.What's the best way to perform the load asynchronously and have a callback function to process the data?Edit: Here's the code I've tried using WebClient - the Load method is still lagging:
Private Sub checkResults()
'request rss feed
Dim w As New System.Net.WebClient
[code]....
The rssReadCallback method is executed fairly quickly after calling checkResults, but then the UI freezes during the Load method.
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Jun 3, 2010
I have developped a piece of software which needs to load in an XML file stored locally, I do this using the following [code]...
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Jun 21, 2010
I'm attempting to load an xml document from an XML column in MSSQL 2008, into an XmlDocument (see code below).
Sometimes the code will break at the xdoc.Load(xr) line with the error "Unexpected end of file and occurred". After breaking, the XmlReader has a value of "None".
While researching the problem, I saw posts that referred to a 4Kb limit on StreamReaders and figured this may be related somehow. So I cut down the size of my document (to around 4Kb) and everything worked fine.
On average, the XML documents I'm importing from the database are 20Kb.
how to get a 'large' amounts of XML from the database into my XmlDocument?
Dim xr As XmlReader = ExportAdapter.GetEditedCheckXML(chkId)
Dim xdoc As New XmlDocument
xdoc.Load(xr)
[Code].....
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Apr 7, 2010
This is a spin off of my other thread: Write XML using XmlDocument
Now I have it creating an xml file and everything's good, I'm working on the the reading of it now. Here's my current
Try
Dim XmlDoc As New XmlDocument
XmlDoc.Load(m_ImportOpenFile.FileName)
[Code]....
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Jan 6, 2011
Consider the following XmlDocument with namespaces:
<Report xmlns="http://schemas.microsoft.com/sqlserver/reporting/2005/01/reportdefinition" xmlns:rd="http://schemas.microsoft.com/SQLServer/reporting/reportdesigner">
<DataSources>
[code]....
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Jan 4, 2010
Do you have a sweet solution in VB (visual studio 2008) to read an OWL file and display nodes on a treeview? It works great for XML but not for OWL when nodes are like as follow: [Code]
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Feb 21, 2012
ok i have image that i bind info in it and i want to read the info now from file (FileStream) its workbut i want to do it not from file so i need to use MemoryStreamhere the example that work and how i do it now how i make it work with MemoryStream (with byte = My.Resources or PictureBox1.image)
Using FS As New IO.FileStream(image, IO.FileMode.Open)
FS.Seek(0, IO.SeekOrigin.End)
While Not FS.ReadByte = Asc("|")
[code].....
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Apr 3, 2010
I would like to search an online (internet) database and import the result in my own Windows program. As I understand from reading and searching I first have to do a get from the default (search) page to get the cookies for instance and then do a post providing the filled input fields and adding the previously collected cookies. So far getting the information seems to work but submitting the data back to get the actual search result doesn't seem to work. This is what I have so far: [code]Anybody that can point me in the right direction? I my assumption correct that I first have to do a Get and then Post the correct data back?
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Mar 15, 2009
I am trying to write a little application that will help me monitor 8 websites sharing the same IP address.
The code that I am using to query the Status of the Websites is failing to report the correct status of the website; by status of the website, I mean, if it is accessible from any browser.
I got a timer that triggers the following
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
'Create a web request for site.
[Code]....
Basically the webresponse is supposed to turn the textbox5 color to "coral" if the website is up and running or accessible, and turn the textbox5 red if the website is down. What is happening is that all the time the timer is triggered, the text box5 turns coral or "good connection" even if I entered a website that does not exist, Then after 3 minutes I get and exception error that states: The operation has timed out.
Basically, I just need a way to query the site and interpret the response by turning the textbox5 to color red in case the website is inaccessible or down.
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Feb 20, 2010
Im looking for tutorials on httpwebrequest and httpwebresponse. Im actually using chilkatsoft http which makes it quite easier.
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Dec 5, 2011
I made a small console program to login into a website.After figuring out on how to successfully login to the website i ran into a other problem... that problem is visiting the inbox page.The problem is as follow: when i visit the page i get logged out :sMy problem is i think that i don't know how to pass the cookie/session correctly since this is not a post/submit action...When i debug the site and click on the hyperlink i only get get response.
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Dec 30, 2009
I've a php script that if the user ahs the privilege to download and image the image is sent to webbrowser but if the user has not the privileges and xml with the info is displayed.[code]
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Sep 16, 2009
i am trying to read website content and selecting some sites from list which contains keyword.But my program is freezing while sending webrequest and getting webresponse.Here is my code:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim j As Integer = 0
Dim stream As System.IO.Stream[code]......
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Dec 5, 2010
I am parsing some xml entries using the xmltextreader and looking for the elements I need by using different textreaders for each in a different loop as follows:
Dim treader As XmlTextReader = New XmlTextReader(New StringReader(item.ToString))
While treader.Read
If treader.Name = "summary" Then
content = treader.ReadElementContentAsString
[code].....
and I do the same for each element I am looking for. Now the problem arises when I get the results for each. I use an arraylist for each element and at times I will have an unequal amount like 100 for summary, 100 for title , 99 for id etc...is there a more efficient way of doing this by checking the entry if all the nodes are there and then just skipping it if it's not.
<entry>
<summary>
<id>
[code].....
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Mar 11, 2010
My application has encountered a problem and needs to close.Of course Microsoft is sorry for the inconvenience, but how am i supposed to debug my app?Which dll fails to load?
The error report contains between others, system.io.fileloadexception
How do you handle situations like these?
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Feb 23, 2011
My code will go to the exception unhandle once my .jpeg file path is empty. How can i correct it to where the code knows it is empty and continue with the program?
[Code]...
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Apr 2, 2010
I'd like to use the webrequest webresponse method to test for the existence of a file.If the first file is there, then I want to test for the existance of the same filename with -1.htm appended to it. If that filename exists, then test for filname-2.htm This continues until the filename being tested comes back 404 error. At which point, the program does NOT blow up, but the do until loop stops and the code continues. I have to search for a link on each one of the pages found once I have determined how many pages there are.How do I test for a file and not have it blow up? It has to loop and it goes through at least once. this is code I wrote. Right now the page just keeps going and going. IE's little logo on the page tab keep going around in a circle like it's in an endless loop.
Dim fr As System.Net.HttpWebRequest
Dim A As Integer = 1
Dim Count As Integer = 0
[code]....
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Jul 18, 2011
I'm trying to parse this XML for the values of puppies and kittens.
<Pets>
<Puppies>4</Puppies>
<Kittens>2</Kittens>
</Pets>
Here's my code
[Code]...
On the first read, the element name is "Pets" and the Case Else gets hit. On the next read, the element name is "Puppies" and puppyCount is correctly set to 4.
But then it seems to skip over "Kittens" and go directly to the inner XML. What should I be doing?
EDIT: XmlReader is faster than other .NET parsers, but my files are small enough that it's probably not a benefit. Joe Ferner's tests. EDIT 2: There's a reader positioning problem in the original code.
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May 9, 2012
I've got a function api_request which takes API method as an argument, and returns XMLTextReader.
Shared Function api_request(method As String) As XmlTextReader
request_text = method & ".xml"
url = "[URL]" & request_text & "&access_token=" & token
Return New XmlTextReader(url)
End Function
I call this function from different places to make request to site API and depending on the method results are parsed very differently. So in each method I have something like this:
Dim s As Xml.XmlReader = api_request("users.get")
While s.Read
If s.NodeType = XmlNodeType.Element Then
If s.Name = "user" Then
[Code] .....
As you may see, I have the code ElseIf s.Name = "error" Then error_handler(s, "user.get"). This is because when error happens, server always returns something like this:
<error>
<error_code>4</error_code>
<error_msg>Incorrect signature</error_msg>
</error>
This is parsed in error_handler Sub, and depending on the error following actions are chosen. This code works, but I have to check if I encounter error like that ElseIf s.Name = "error" every time, though all the methods call the api_request function. Is it possible to check for error in api_request function before returning the Reader? The problem is if I start reading xml there, and there isn't an error, I can't anyhow position the Reader to the start.
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Jul 6, 2009
i am using visual studio 2008 using vb.net. I have opened an xml stream and am reading it using xmltextreader. So far so good. I am using the following code to parse the stream and to get an understanding of what it contains and how to use the info.
[Code]...
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Jul 1, 2011
I'm hoping somebody can help me with this... I am reading an XML file created from the server and all is good except that when I try to process the file it's always skipping one of the first child elements. And when I run a test with no processing, just a straight reader and looping through the elements, the 1st element is there. But as soon as I add a check to see if the node is an Element, it skips an "Attachment" element.Here's my XML:
[Code]...
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Oct 26, 2010
Whilst trying to load information from an Excel File I have, I get the following message:
System.Runtime.InteropServices.COMException (0x800A03EC): Exception from HRESULT: 0x800A03EC
from this:
Code:
Dim strFileTeam As String
Dim objExcel As Excel.Application
Dim objWorkbook As Excel.Workbook
[code]....
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Dec 28, 2009
I've placed a treeview on my form and when debugging everything works as planned. However, when I publish the application and run it on another machine, I get a null reference exception. This form is an MDIchild and another form in the same child collection loads its TreeView data with no problem.Here's my code, MajorCategories(), MiddleCategories(), MinorCategories() are all arrays of Structures filled in an outside subroutine.
Private Sub CategoryMaintenance_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
RedrawTree()
[code].....
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Dec 9, 2010
In VB.NET or C#, I'm trying to read the contents of a text file that is in use by another program (that's the point, actually, I can't stop the program or it stops writing to the text file, and I want to periodically read out what is currently in the text file in another program)[code]in VB the code is above (a C# answer would be fine as well), however, it still throws the IO exception "The process cannot access the file 'file.txt' because it is being used by another process." Are there any workarounds in this scenario?
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Nov 16, 2010
I am producing an XML file in my unit test using
Public Sub rssParserTest
Dim Const rssUri as String = "rssTestFile.xml"
Dim xmlFile = <rss version="2.0">
[Code]...
I want to remove the unit test dependency on a physical file and use a stream instead but my efforts so far have come to nought. (Is this best practise?)I am using NMock2 for mocking if I should be doing something with that.
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Mar 20, 2006
OverviewThe fastest way to read or write Xml documents in a linear fashion is to use the XmlTextReader and XmlTextWriter classes in the System.Xml namespace. If read- or write-only forward-only access is too limiting, however, the System.Xml.XmlDocument class provides the ability to easily modify existing documents (adding, removing, or modifying elements and / or attributes) and leverages the powerful search capabilities of XPath.
Getting StartedThe XmlDocument can load Xml from a string in memory, from a URL, or from a file path. There are two methods that enable this functionality: Load and LoadXml. To load a document from either a URL or file path, use the Load method. Following is an example of using the LoadXml method to load an Xml document from memory. (NOTE: we will be working with this particular document throughout this article)
[Code]...
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Dec 2, 2009
while looping through a short XML file called from xmltextreader retrieved from a webservice, I'm repeatedly getting the error: The request was aborted: The connection was closed unexpectedly. it constantly dies a row or two from completing the parsing.here's my short code:Code:
'Get the principal-id for Group Dim url As String = "https://xxxxx.acrobat.com/api/xml?action=principal-list&session=" & strCookie xmlRead = WebRequestToServer(url) Do While xmlRead.Read If xmlRead.NodeType = XmlNodeType.Element Then If xmlRead.Name = "principal" Then strGroupID = xmlRead.GetAttribute("principal-
[code]....
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