Use XML Reader To Read It As Its Quite Large?
Mar 6, 2009I have following XML structure, how can i use XML reader to read it as its quite large.[code]...
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Invalid Attempt To Call Read When Reader Is Closed (While OleDbDataReader.Read)
Sep 1, 2009There are already multiple threads about this, but i don't have the knowledge about the different SQL databases/methods to make heads or tales from it.I am using an OleDbDataCommand, an OleDbDataReader and the following code
Dim Query2 As OleDb.OleDbCommand
Dim RetVal2 As OleDb.OleDbDataReader
Query2 = New OleDb.OleDbCommand("Select [section], [title], [id] From " & DtSections & " Where [volume] = " & volu & " And [chapter] = " & chapter & "", AccessConn)
[code]....
value)In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. Type) Object?
Choose Specify Data To Be Read By Sql Reader?
Aug 16, 2010I have the first form and create 5 checkboxes which are connected to my db. Whichever checkbox is checked and the value will be inserted into the db (value: 1; data type: tinyint).And now, the second form will pull out the data base on the which checkbox is checked when the button is clicked. But for somehow i got stucked at the following code.
The first form:
Dim nValue As Boolean
If chkbox5.Checked = True Then
nValue = 1
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Invalid To Read When Reader Is Closed?
Jun 9, 2011i am getting an error like invalid attempt to read when reader is closed
[Code]...
Reader.read String As Variable?
Apr 16, 2009I have a function that queries the server to add items to a drop down list. Here is the excerpt in question:
While reader.Read()
With f.items
'f is the drop down list object
[Code].....
I want to be able to use this same function over and over to populate all the drop down lists for the whole page, but am getting the error "column g.tostring not found". How do I get this to be handled as a variable string?
Stream Reader To Read .txt File
May 16, 2009Radio button 2 beacuse there are 3 and you have to pick one (The right one) to advance on to the next form.
View 4 RepliesUsing The Stream Reader To Read Web Files?
Jul 2, 2009Is there a method of using the stream reader to read webfiles?
View 1 RepliesEID SDK - See If Card Inserted Into Reader Then Read Out Data
Mar 14, 2010I am trying to use the eID SDK (for using the belgian ID-card) in VB. It's supported but I can't get it to work. I have never worked with sdk's before. I did manage to get it to work in c++ in console but I really need it in visual basic. Also the VB examples that come with the sdk are made in an older version of visual studio and when my version tries to convert them they don't work. I want to use the sdk to see when a card is inserted into the reader and to read out the data. (both i got to work in c++ console).
View 2 RepliesRead From Multiple Tables In Data Reader
Mar 18, 2010I'm trying to read from two tables in mysql:
[Code]...
Or even other techniques on achieving the goal of reading data from two tables using data reader? This is a winform, not a web form
Read Text File Through Stream Reader?
Apr 30, 2012I have a text file name list.txt which contains data like following;
AC-No. Name Time State New State Exception
100 ZULFIQUAR 09/04/2012 01:53 PM C/In Invalid
100 ZULFIQUAR 10/04/2012 01:39 PM C/In Invalid
100 ZULFIQUAR 11/04/2012 01:38 PM C/In Invalid
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VS 2005 : Read Web Page Using Stream Reader?
Oct 19, 2010From few days I am doing efforts to read web pages using webbrowser control in my desktop application. But it is very slower than my expectations(because I want to read lots of pages in minutes and browser control reads almost one page in 5 to 10 seconds), what I need is to read two or three tags written in web page.
So finally I decided to use something, which can give me only source code of page. I think StreamReader will help me to read it. I am not sure if it is flaxible with my purpose, or something else is there which can give me only html source code of web page.
I have written this code to read html code, but it gives error.
Quote:
System.ArgumentException: URI formats are not supported.
public static string Navigate(string URL)
{
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Does Reader Just Read Numbers Added To Buttom Of Bar Code
Jun 21, 2012I my small application to read bar codes. url...
1. Code do you code to read what this scans.
2. Does the reader just read the numbers added to the buttom of the bar code? so with that i could look an item up in a database?
Invalid Attempt To Call Read When Reader Is Closed
Dec 23, 2011I am gettting the following 2 errors:
Invalid attempt to call Read when reader is closed and sometimes Invalid attempt to call MetaData when reader is closed when attempting to read from a sqldatareader object. What I want is to list groups in listview. The last column is "Total Numbers".[code]...
It works ok for the first row but after that the first error generates. I don't want to include the COUNT function in the main sql cos then i would be required to group the rest fields (there are 9 of them totally). I tried MARS but it don't work at all in my connection which is like
Invalid Attempt To Call Read When Reader Is Closed?
Mar 31, 2011"Invalid attempt to call Read when reader is closed." is returned when trying to use a SqlDataReader in a Thread or BackgroundWorker (Do While z.rdr.Read() in the bold sections - I know this code does the same thing twice....). I have looked at a few forum posts but I did not find a method to keep the SqlDataReader open when passing the arguments. How do I thread the SqlDataReader loop?
[Code]...
Stream Reader And Writer - Read Data From A File
Jan 27, 2009I am trying to make my application read data from a file. Then save the data back. However I keep getting an error which says the file is still open so cannot be edited. I also read that there is an issue with the streamreader and streamwriter do not close the program straight away. I was wondering if anyone had a way around this or any alternative ideas. Heres my code so far!
[Code]...
Find A Program That Can Read Data From A USB CCID Card Reader?
Oct 14, 2011I have been looking all over the net trying to find a program that can read data from a USB CCID card reader.
after several hours and several pages of useless info i thought maybe there is a way i could create a simple progeam in VB to read the data, so i started another long search for info also to no avail.
Does anyone know of anything like this or if its even posable?
Using Stream Reader To Read Some Text(txt Format) And Show In Textbox1?
Mar 8, 2012I'm using stream reader to read some text(txt format) n show in textbox1. I want stop at the second last line to get the string.Below is my code:
path="c:dic.txt"Dim reader As New StreamReader(path)Do While reader.?? //how to instruct to stop when read until second last line,because i don't know how many lines in the text file??
Using A Data Reader To Read An Excel Spreadsheet And Want To Update A SQL Express Table?
Mar 10, 2009I am using Visual Studio 2005. I am using a data reader to read an Excel spreadsheet and want to update a SQL Express table. The datatypes in this table mimic a software application I will eventually be passing data to and are listed in the comments in my code. No matter what I do or change, this will not run. I even populated my spreadsheet with zeros and this will not run. I have found many suggestions on the web and tried changing things but nothing seems to work. I also don't know specifically which variable is causing the error or the proper way to make sure there are no blanks in this spreadsheet.The error says "conversion from string "" to 'Double' is not valid Here is my code:
Public Sub btnUpload_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpload.Click
'Connect to the Excel spreadsheet
Dim xConnStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & txtFileName.Text & ";" & _
using a data reader to read an Excel spreadsheet and want to update a SQL Express table
How To Read Large XML File Quickly
Mar 16, 2010I am trying to read this XML document.
An excerpt:
<datafile xmlns:xs="[URL]" xmlns:xsi="[URL]" xsi:noNamespaceSchemaLocation="wiitdb.xsd">
<WiiTDB version="20100217113738" games="2368"/>
<game name=" Wanted: 50 Wacky Jobs (DEMO) (USA) (EN)">
<id>DHKE18</id><type/>
<region>NTSC-U</region>
[Code] .....
It just skips the "While iter.MoveNext" part of the code. I tries it with a simple XML file, and it works fine.
Read 2nd-to-last Line Of A Very Large Log File
Oct 7, 2011I need to read the second-to-last line of a very large log file.
I can't read the entire thing into memory, count lines, etc etc. I can't use Filestream.Setlength because that needs readwrite access and the log will be opened by another application. And it has to be fast. However, the line ends in a cr/lf meaning the last line is actually empty. Been struggling with this all day, and its hurting my head! Not good on a Friday!
I have a function that can read the last line but can't get it to go one line up. I can get it to read characters from the end of the line, but that's not much of a help with a variable length line!
Maybe fs SeekOrigin would work as it could run backwards looking at an example from MSDN - need to get the data before the last cr/lf and end at the next one... hmmm... problem is that that example also writes the text backwards as well.
I'm monitoring the log for particular entries for issues that are causing us grief at the moment.
Read A Very Large Database Table In Program?
Apr 22, 2011I'm developing a VB.NET application to obtain data from any data source (using an odbc connection string), and because this i can't use specific .net connectors like MySql.Net connector and i can't previously know if the file/DMBS supports LIMIT parameter. This app will read data from a table in the data source and use the information to make some files. At this point there was no problem with some tables because they are less than 3,000,000 records length, but there is a table that has 5,000,000+ rows length, and when i send the query the connection is lost. I'm working with OdbcDataReader, because i read on MSDN site that this is the best way to read a table one row at time and i just use each record once.[code]...
View 2 RepliesLaunch An Application Called Foxit Reader Pdf Reader?
May 18, 2011I want to launch a application called Foxit Reader pdf Reader .I know System.Diagnostics.Process.Start(path) can do it but . Requirements are Foxit Reader should be installed on machine.Now if it is installed how to serarch for the path of its Executable to provide the parameter as I can not hardcode the path for different machines.
View 3 RepliesPrinting A PDF Using FoxIt Reader Or Adobe Reader?
Feb 28, 2012I am having an issue with both Adobe Reader and FoxIt Reader when trying to print a PDF document. Both issues are different but a solution to either one will allow me to fix my issue.The issue I am having with Adobe Reader when trying to print using the following code is that it will not print it to the network printer I specify but just the default printer.
Dim AdobeReader As New Process
AdobeReader.StartInfo.CreateNoWindow = False
AdobeReader.StartInfo.Verb = "print"
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Query Return Value - Getting An Error In Runtime That Is "Invalid Attempt To Call Read When Reader Is Closed" ?
Aug 31, 2009I have an error that is during the query to a database ExecuteReader 'phase' of my program, i am assigning an .OleDbDataReader to a variable RetVal and then, i am giving this RetVal = Query.ExecuteReader, and then in the while the query is being read loop(While RetVal.Read) i am getting an error in runtime that is "Invalid attempt to call Read when reader is closed." I know this means i have to open the reader, but i don't know how to do this, as i have been using this process for a few weeks and haven't had this error pop up. (and i have managed to use the while loop)If you're not living on the edge, you're taking up too much room
View 7 RepliesRead Smart Card Data Using Card Reader?
Dec 23, 2009i want to read data from smart card using card reader.i need vb.net code help as well as total process that mean what dll/exe will be needed and how can i determine that the card is inserted or ejected from card reader?
View 3 RepliesRead A Omr Sheet Without Using A Specific Omr Sheet Reader?
Mar 23, 2010I need a code to read a omr sheet without using a specific omr sheet reader. i want to use normal scanner for this.
View 2 RepliesLarge Multidimensial Array - Write A Program To Do Markov Chain But States Are Quite Large
Jun 9, 2011I want to write a program to do Markov chain, but my states are quite large. First of all I calculate all the transition probabilities and revenues for all states(1381860 total states), and store in a multidimensional array. Public RevArr(0 To 9, 0 To 750, 0 To 282) As Long
After that the iteration of markov chain should use these as inputs to calculate the steady-state probabilities. But when I try to run the main code I got this error.Exception of type 'System.OutOfMemoryException' was thrown.
The following is the declaration of second array I add just another dimension for storing all the iterations, but I get this error. Dim stateprob(IT + 1, 0 To 9, 0 To 750, 0 To 282) As single
Read A Very Large File Line By Line Instead Of Loading It All?
Feb 25, 2009the best method to read a huge file? I'm guessing its with "stream"?It's like a 200mb file.I need to read each line and do something if the line contains a search string.
Code:Imports System.IO
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim strFile As String = "c:
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File I/O And Registry :: Stream Reader I/O - Saves The File With No Crlf's For When Use Reader
Sep 24, 2008how would I accomplish saving a large piece of data, using the Stream Reader for the Line-by-Line, while keeping the carriage return line feeds in there?
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Converting VBA XML Reader To .net?
Feb 10, 2011I am currently rewriting a VBA XML reader to a VB.net version for a project. I have the following code in VBA:
Dim XML_Doc As Object: Set XML_Doc = CreateObject("MSXML2.DOMDocument")
Dim XML_Detail As New ADODB.Recordset: XML_Detail.ActiveConnection =
"Provider=MSDAOSP; Data Source=MSXML2.DSOControl.2.6;"
I was told that I should be able to use almost the exact code in my VB.Net version but I am running into some problems. I added as a reference to the VB.net project the Microsoft ActiveX 2.8 so I can use the ADODB.
The code in VB.Net is
Dim XmlDoc As Object : XmlDoc = CreateObject("MSXML2.DOMDocument")
Dim XmlDetail As New ADODB.Recordset : XmlDetail.ActiveConnection =
"Provider=MSDAOSP; Data Source=MSXML2.DSOControl.2.6;"
When running the application it gets to the XmlDetail and throws the following error:System.Runtime.InteropServices.COMException was unhandled. Arguments are of the wrong type, are out of acceptable range, or are in conflict with one another.
