System.Text.Encoding Runs Asynchronous?
Jun 12, 2010
I recently worked on a small-scale EPP Client, which is a communications protocol over TCP/IP using XML packets to exchange commands and responses. The server I'm working with specifically is employing SSL so the code contains references to an SSLStream certificates and passphrases - please don't ask me to post more code than I provide here.We're building the XML EPP Commands in raw System.Strings, then using System.Text.Encoding.UTF8.GetBytes on the string to populate a Byte Array, then writing the Byte Array into the SSLStream. The server would communicate, negotiate certificates, and
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Oct 28, 2009
I am sending a DDE message to a client using System.Text.Encoding.ASCII.GetBytes(item) . However, before the message is actually sent, I would like to get the message coded where if the item="Ask" then item=Ask (string variable) and so on. The code is:
Protected Overrides Function OnRequest(ByVal conversation As DdeConversation, ByVal item As String, ByVal format As Integer) As RequestResult
' Return data to the client only if the format is CF_TEXT
[code]....
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Nov 1, 2010
I can't use System.Text.Encoding, I get this error when trying to use it:
A first chance exception of type 'System.NullReferenceException' occurred in WindowsApplication3.exe
A first chance exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll
this is the
Private _TextEncoding As System.Text.Encoding
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim _DownloadedBytes() As Byte = _TextEncoding.GetBytes("teststste")
[code]....
and then it exit function.
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Nov 4, 2009
I would like to pass a whitespace character by using the System.Text.Encoding.ASCII.GetBytes(" "), and System.Text.Encoding.Unicode.GetBytes(" ") , where " " is the whitespace Character required. What do I need to type (" ") to get a whitespace character passed.?
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Jul 26, 2011
if we don't mention the decoding what decoding will they use?I do not think it's System.Text.Encoding.Default. Things work well if I EXPLICITLY put System.Text.Encoding.Default but things go wrong when I live that empty.So this doesn't work well
Dim b = System.IO.File.ReadAllText("test.txt")
System.IO.File.WriteAllText("test4.txt", b)
[Code]...
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Feb 2, 2010
I did Build a program and copied only the EXE file to USB drive. Tried to run it on different computers. XP computers had no problem running it. The ME and Win98 could not run the program since the MSCOREE.DLL was missing. I need to install something on those computers to enable them but there are security issues and patches. Is there anyway to make my program standalone?
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May 3, 2011
I have done very little with encoding of Text. Truthfully, I don't really even know what it means exactly.
For example, if I have something like:
CODE:
Is that 'encoded' in memory in a particular format? Does that format depend on what language I'm using?
If I were in another country, like China, for example, and I had a string of Chinese (mandarin? My apologies if I'm using the wrong words here) would the following code (that I've used fine on English strings) still work the same?
CODE:
Or would it lose all meaning when you convert that .Net string to a UTF8Encoding when that conversion isn't valid?
Finally, I've worked with .Net for a few years now and I've never seen, heard, or had to do anything with Encoding. Am I the exception, or is it not a common thing to do?
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Aug 21, 2009
I am writing an application that must generate a plain Text file with fixed sized columns.my current code is:
Dim MyFilePath As String = Path & FILE_PREFIX & FileNr & ".TXT"
IO.File.Delete(MyFilePath)
Dim FileStr As New IO.StreamWriter(MyFilePath, False, <ENCODER HERE>)
[code].....
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Mar 8, 2010
I have an ASP.Net app that allows a user to write text into a Telerik RadEditor control and then send an email.For some reason I'm sometimes getting strange characters showing up in the email that is generated.se if I use the later, the text would show up just fine. If I pull up the saved record within the ASP.Net apps interface it looks just fine. It also appears just fine when I view the text within the recorded of the MS SQL table it was stored in. Continued--->I have tried to add it to the constructor of my email class with/without mybase but that had no effect.
Public Sub New(ByVal EmailDate As DateTime, ByVal LogoPath As String)
MyBase.New()
MyBase.BodyEncoding = Encoding.GetEncoding("iso-8859-1")
[code].....
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Apr 23, 2012
I am creating xml files that contain chinese posts and it seemed to be working but I started getting an error:
This page contains the following errors:
error on line 4165 at column 25: Input is not proper UTF-8, indicate encoding ! Bytes: 0x0B 0xC3 0xA5 0xC2 Below is a rendering of the page up to the first error.
When trying to open some of the resulting files.The line it references contains chinese characters and this occurs only in some situations and my guess is that the text is sometimes containing some characters that throw it off. How can I ensure that the text for that field will always be properly encoded? I don't even understand why the issue yet.
Public Shared xwriter As XmlTextWriter = New XmlTextWriter(xmlfile, Encoding.UTF8)
I make sure the xmltextwriter is properly declared.
EDIT:
The issue is that I use vb.net and apparantly it encodes everything in utf-16 so I assume this is fine. The problem is that the text I am receiving is probably double encoded or incorrectly encoded and I need to clean it before using it; so that my xml is valid.
EDIT:
so if I need to fix my data, my question is how can I detect what encoding is used for a specific text and how do I convert into utf8 format that can be viewed in an xml file and make the file valid.
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Mar 7, 2011
I used WriteAllText to set the encoding for a text file. When I wrote it, everything worked out fine. However, strange characters or symbols appeared in some ofm y fields without my having typed it. why is this so? The encoding I'm using is UTF8. I used the WriteAllText to write the fields to file but did not use the ReadAllText to bring the data back into the fields or program.
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Apr 1, 2011
I have a VB2010 project where I need to read a tab delimited 50MB file using Microsoft.VisualBasic.FileIO.TextFieldParser. This technique works fine until the reader encounters a Unicode character upon which it inserts the little square thingy. The obvious choice is to change the encoding of the reader to Unicode from the default. This would probably work fine but for most files but this one is fairly large and I get the error TextFieldParser is unable to complete the read operation because maximum buffer size has been exceeded. By the way this file can be read completely without the Unicode option. Making the file smaller or breaking it up really isn't an option. Is is possible to increase the buffer size or is there another way to read this data that places the data in fields like the textparser and allows unicode characters?
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Apr 30, 2012
I have a problem with combobox. I set the DrawMode into OwnerDrawVariable so I can draw items seperately with styles, but the characters of the items are now displaying blocks. The block characters are none ASCII. It used to display well but not now and I don't know what caused it to happen. I didn't change my system locale. At the same time, other combobox that have Normal DrawMode displays nicely fine.
My custom drawing code:
e.Graphics.DrawString(combo.Items(e.Index), combo.Font, b2, rect.X, rect.Y)
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Jun 10, 2011
Can an application refuse the Sendkeys function? I am trying to write an app that will paste text into an application called Cerner which runs via a secure vpn. My code works fine going into notepad or word. I doesn't seem to do anything with the Cerner program.
I thought that the sendkeys command basically mimiced the keyboard.
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Jun 21, 2010
i would like to ask is there anyway to read a txt file with UTF-8 encoding using streamreader or filestream. the txt file is contain some extended ASCII that makes me cannot read the characters properly. I hav tried Encoding.ASCII.GetString(Encoding.UTF8.GetBytes()) but still it return wrong character when it's reading extended ASCII code.
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Aug 17, 2009
I have this code obtaining data from a sensor that is sending a string that contains 4 numbers separated by a tab and terminated by an end of line/ I am trying to use an asynchronous callback to get the data over TCP. That problem is that the callback function is not grabbing the complete string. Sometimes it will, other times it gets half in one retrieve and half in another. I need the callback to hold off until it gets a newline character.
Code:
Public Sub readVaisala()
Dim ip As String = "192.168.1.30"
Dim portNumber As Integer = 23
Dim time As Int32 = Now.Second * 1000 + Now.Millisecond
[code].....
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Feb 18, 2011
How can I set up an asynchronous web service in asp.net?
I want to call a webservice to post some data to a database, but I don't care if the response failed or succeeded.
I can use .net 2.0 or 3.5 only and it can be in vb or c#.
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Mar 15, 2009
I have a small VB.NET application built using VS 2008 and .NET 3.5.Very simply, there is a timer that kicks off every few seconds to download an XML stream from the web. I look at this stream and manipulate it.The problem I am facing is that the remote web server may not respond in a timely fashion to the following line of
[code]...
How can I implement asynchronous calls so that the my application can behave without locking up?
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Feb 1, 2010
I have a class with a mthod which does a a time consuming task. I know how to start the method in a separate thread using the Threading.Thread class. What I want to do is use callback so as to have the method report its result to another method when completed. I chose to use the asynchronous Begin/End call pattern.
Private Function BeginConnect(ByVal URl As String, ByVal callback As AsyncCallback, ByVal state As Object) As IAsyncResult
'Some Code
End Function
[code]....
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Feb 23, 2010
i'm creating an Asynchronous socket programming in vb.net. i've utilised the code from Asynchronous client and server code frtom the following links:m a new user so could post only one link fully)When I try to connect the for more than one client the second client always waits until the first clientcompletes the call. i want the clients to accept calls at the same time
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Oct 12, 2010
I am writing web services with VB.NET (2.0). The client side will use different technologies such as Java and Siebel. So, if I write asynchronous web services, is it possible for different platforms to consume them? I know it is quite easy with a consumer having .NET platform, but not sure for different platforms. Is it enough for them to have asynchronous ability, or should it be a similar platform?
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Feb 12, 2010
I noticed that HttpWebRequest freezes the UI while it's waiting for a web page to be downloaded:
[code]
If someone's done this before, what is a good way to keep the application responsive?
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Feb 2, 2012
I am using a BackgroundWorker, an OleDBDataReader, a DataGridView to retrieve records asynchronously from an Access database. I call ProgressChanged event from the DoWork event every time I retrieve a record. In ProgressChanged event I add that record to the DataGridView and also update a label. There are about 2000 records to retrieve.I have two problems:Although I'm running an asynchronous operation, the UI remains unresponsive unless I use Thread.Sleep() inside the DoWork event (Why?). Using Sleep() method with an argument of 1 causes the process to run 20 times slower! (Process takes about 1 second if I comment out the 'Threading.Thread.Sleep(1)' line, compared to 20 seconds if I use it.) What can I do to get a responsive UI and a fast background operation (at least not 20 times slower!)?The other problem I am facing is: if I close the form while the asynchronous operation is ongoing, I get this exception (I think in the ProgressChanged event): Exception has been thrown by the target of an invocation. I tried using FormClosing event to end the process but no luck. How to fix this?
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Sep 21, 2011
I'm having a problem with this code in the highlighted line(*); getting the error in the heading.
Dim htmlarraylist As New List(Of iTextSharp.text.IElement)
htmlarraylist = *HTMLWorker.ParseToList(New StreamReader(tempFile), New StyleSheet())*
[Code].....
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Oct 15, 2011
I made a TCP server which communicates with multiple clients at once, but I can't seem to be able to make them stable. When one of the client sends 100 packets to the server, the server receives only a few of them.Here's the client code in PasteBin. It shows how the client connects to the server and then sends 100 messages in a For loop to the server.And here's how the server handles the connection. I couldn't paste the full source as it's hundreds of lines long so let me know if it's missing any mandatory parts and I'll upload them as well.
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Jan 9, 2010
I create an automatic ftp file downloader by using FTPwebrequest. In which, is there any possible to download multiple files simultaneously using Asynchrounous and threading concept?
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Jan 24, 2011
I'm using asynchronous to send/receive from a website I want to block the BeginGetRequestStream method which I have done, using
Code:
WaitEvent.WaitOne(1000 * 20, false);
the problem is that it blocks the UI, which I thought it did not so it basically works like GetRequestStream which does block the UI.
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Jun 3, 2011
I basically have a few thousand transactions 7,000 - 10,000 transactions to process over a short time. The flow goes like this.
---> ----> ---> ---> receive (1000) as each transaction takes approx 2 seconds so if i were to process synchronously it would take all night......
Now first i would like to ask if i am going about this the right way ? the service i am communicating with is not .net but is built to handle large amounts of requests. I have obtained the following code that suggests it will do what i am after
dim strxmlreq as string = '(this is where i input my xml string)
Dim request As HttpWebRequest
' Create the request
[CODE]...
The problem i have is if the above will work for me where exactly do i catch the returned xml string ? I assumed "result" would be the xml output string.
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Jun 9, 2011
Download file asynchronous using sockets
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Feb 1, 2010
I have a class with a mthod which does a a time consuming task. I know how to start the method in a separate thread using the Threading.Thread class. What I want to do is use callback so as to have the method report its result to another method when completed. I chose to use the asynchronous Begin/End call pattern.
My thoughts are:
Private Function BeginConnect(ByVal URl As String, ByVal callback As AsyncCallback, ByVal state As Object) As IAsyncResult
'Some Code
[Code].....
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