Make A Very Simple Asynchronous Method Call In Program?
May 1, 2012
I just have a simple vb.net website that need to call a Sub that performs a very long task that works with syncing up some directories in the filesystem (details not important).
When I call the method, it eventually times out on the website waiting for the sub routine to complete. However, even though the website times out, the routine eventually completes it's task and all the directories end up as they should.
I want to just prevent the timeout so I'd like to just call the Sub asynchronously. I do not need (or even want) and callback/confirmation that it ran successfully.[code]...
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Jun 16, 2010
I need to make an asynchronous call to a method which for the sake of simplicity counts from 1 to 100. If an exception is thrown during the methods counting process, lets say at 50 I need to stop the methods execution, dispose of a few objects and restart it at 51 but have no idea how to go about it.I basically need to raise an event from the method to the main thread and restart the asynchrounous method.
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Oct 6, 2010
VB.NET 2010, .NET 4/I have a System.Timers.Timer object that does some work on its elapsed event:
Private Sub MasterTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles MasterTimer.Elapsed
MasterTimer.Enabled = False
'...work...
MasterTimer.Enabled = True
End Sub
My problem is that the work that it's doing sometimes gets stuck. Part of the work is serial communication so it might be getting stuck waiting for a response from something. I've already modified my serial communication code a bit to hopefully solve the problem. However, this timer is basically the heartbeat of a production control application and it is very bad if it were to stop for any reason. I was thinking that it might be nice to put in a fail-safe timeout so that, if the "work" is taking too long, the timer could re-enable itself and try again. I was thinking of something like this:Move the work into a subroutine and create a delegate:
Private Delegate Sub WorkDelegate()
Private Sub Work()
'...work...
End Sub
Call the work by invoking the delegate and then use WaitOne(timeout) on the IAsyncResult to specify a timeout:
Private Sub MasterTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles MasterTimer.Elapsed
MasterTimer.Enabled = False
Dim workDel as New WorkDelegate(AddressOf Work)
[code]....
In that it would re-enter a subroutine that is already running? Is there a way to abort Work() if it hasn't finished after the timeout? In other words, just cease execution of Work() if result.IsCompleted Is False after WaitOne?
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Sep 11, 2011
I'm getting a string response from a server using a simple call of the Webclient.DownloadString() method, the returned string is something like this:
"snakeu003Cbu003E eyesu003C/bu003E"
how can I convert that in whatever those codes means?
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Feb 12, 2011
I have been trying to figure this our for far too long and I cannot get my head around it. Every example I have seen seems to be far more complex that I need. I have a web service in my project (.asmx). I want to call it very simply from a button on a webpage.
Click
Run service asynchronously
return control back to webpage (web
service running in background)
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Aug 5, 2011
I have a class file framebuild with a class command and class commandlist(of command). I fill the comandlist with a method in the class commandlist, to do that I make in the class commandlist a new instance of commandlist. But now in form4 I want to make a listbox which represents the commandlist. Then I also should make a new instance of a new instance? It is no problem to fill the list in the class instance but I want to fill it in the form.vb
Public Class rts485command
Property name As String = ""
Property hexname As Byte = &H0
Property framelength As Byte = &H0
End Class
[Code] .....
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Feb 21, 2011
How can i make http Connection in vb.net? what is the method call used?
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Aug 13, 2009
I'm using ASMX web services in VB.Net in VS 2005. I am calling a function method on the web service that returns a true or false value. This works fine if I call the the web method synchronously, but if I want to call the method asynchronously, the function returns to a sub and there is no return value; therefore, I can't tell whether the result of call is true or false. Is there a way to make an asynchronous call and still get the true or false result (perhaps using the userState Object)?
For Example:
Dim MyResult as Boolean = MyService.GetResult(10)
Dim MyResult as Boolean = MyServer.GetResultAsync(10)
This doesn't work the compiler complains: "Expression Does Not Produce a Value"
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May 28, 2010
I need to build an an asynchronous encrypt/decrypt method but I don't know where to begin. I have only one requirement. I need to get a serial number like output for example:
ABC12-EFG45-POI98-KJUH8-KJSAK
I need to build a minimalistic licensing algorithm, where I want to create a serial number based on a salt, username, machinename etc.
My Sharepoint Blog [URL]
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Mar 27, 2009
Is webbrowser.navigate method is synchronous or asynchronous?
example:
dim ct as integer =0
dim counter as integer =0
ct+=1
wbb.navigate(""http://www.yahoo.com")
counter+=1
will counter get increased after firing webbrowser.document completed event?
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Jul 2, 2009
i want to make a simple program that can be used of add,delete,edit,save,, thats all, so that i will understand the basic of programing.so that in that program i will developed it and also connection of vb2005 to sql server 2005.. i am amateur here using this vb2005 and sql server 2005.
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May 4, 2009
I'm trying to make a per-user shell for a Vista box to simplify use of a particular system for my users. I have no problem making a program that I want to use and I am familiar with the process of editin the registry to make my program the users shell but I've run into a snag.
Whenever a user with the custom shell logs on, there is a delay just after they enter their password where the system will sit at "Preparing Desktop" for about 30 seconds. I know for a fact that the user desktop is already made and this shouldn't be taking that long.
I've poked around on the web and see various places saying that winlogon is waiting for the shell to flag a "shell ready" flag of some sort but I am unfamiliar with any such flag.
Anyone know of such a fix for the long login time or anything about a shell ready flag?
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Jun 4, 2012
Background: My application is used to execute tests using Selenium RC servers, and occasionally I'm running into a problem when my call to a Selenium command doesn't return the response from the RC server - it then ends up blocking the thread that is executing the test.
[Code]...
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Jul 27, 2009
how to make a simple folder locking program and sorry don't have any code for it.
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Feb 10, 2011
I'm trying to make a simple program that detects if a game closes, and when it does, it shuts down the computer.
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Mar 1, 2009
i was wondering how i can make a simple program that when for eg a user enters 4 it gives this figure **** and so i want that if the user enters 5 it gives ***** etc.
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Feb 27, 2011
I am trying to make a very simple program that connects to a MySQL database using VB.NET. My program only has one form and one label. I setup my MySQL database to have a table and one field (a VARCHAR)called "Tab1". I manually inserted the value "CLOSED" into the Tab1 field using PHPMyAdmin. I want my program to change the value of the field to OPEN/CLOSED and I also want the label text on my form to change too when it's clicked.
[Code]...
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Jun 29, 2010
i want to make some simple program for encrypt / decrypting message using VB, my problem was when i want to decrypt the message, the result was incorrect,
Code:
Dim decryptor As Integer = TextBoxhasilencrypt.Text
Dim privatekey As Integer = Labelprivatekey.Text
Dim modulus As Integer = LabelModulus.Text
[code]....
the logic error on the program was when the "power of" are odd
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Sep 27, 2010
I was wanting to make a simple client-server program.I saw some code for it and it was easy to understand but it was with winsock.
The program is:
Client: Clicks button.
Server: Recieves Text written in clients textbox.
Is there a reasonably easy way to do this?Maybe Net.Sockets or something similar?
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Jan 11, 2010
I am trying to make a simple program to convert ascii in its code format
Example: Chr(53) & Chr(53) & Chr(54) & Chr(100) & Chr(52)
to a readable format. I understand that this can be easily accomplished by writing in the ascii code into the code will do it but I am trying to create a more interactive method of doing it so I can copy and paste a long length of code into a textbox and have it update a label with the conversion.
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Aug 23, 2011
Im learning Visual Basic 2010 on my programming class and we reached the part of file handling. Here i tried to make a simple program that can create a text file with the content of what i type on the textbox, basically i create the file if it doesn't exist, and if it already exists i append the content to it. Once the file is saved i can read it using the "Open" button. Unfortunataly, whenever i try to create the file, the compiler gives me an error saying that it cannot modify a closed file, although i've followed up the execution instruction by instruction and i can't find the error.
Imports System.IO
Public Class Form1
Dim body As String
[code]....
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May 25, 2009
I wanna do something like this. I connect to my phone using com port then I wanna make phone call by using vb.net.
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Jul 12, 2011
The scenario is that an ASP.NET webforms page will call a web service in an async manner to make about 8 web service calls to various providers for data. I would like to run them in parallel to speed things up. I also need to wait for them all to come back before moving on.
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Nov 12, 2009
Does calling the Dispose method on a Windows.Forms.Timer call it's Stop method? Or should I stop the timer before I dispose it?
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Feb 16, 2010
I will try to explain what I need.Let's say that I have a class like this:
Public Class Example1 Public Sub ToBeCalled()
[Code]...
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Apr 22, 2012
Base class has one field to hold numeric balance value. With 2 methods that accept arguments for adding and subtracting the new input calculating new balance. Sub class has four fields dates, transaction, memo and amount.I have a deposit form, and withdraw form. Each time one transaction is entered it creates an object with sub class fields, then adds to the account collection. My problem is not understanding how to call the deposit/withdraw method and pass the current transaction amount back to the base class to alculate the new balance. Does anyone have any links to information/tutorials on how to perform something like this? As you can see with my code I have tried various different approaches without any success.
[Code]...
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Jan 29, 2012
I have a Application that Crypts all Files in a Directory and the Subdirectories
Public Shared Sub CryptAllFiles(ByVal crypt As Object)
'check if this dir exists
Dim vDirInfo As New DirectoryInfo(vPath)
If Not vDirInfo.Exists Then Exit Sub
'get all files' sizes in current path
[Code]...
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Apr 15, 2012
i am making a program that can paint something.the painting code is easy to do, but i cannot find out how can i make the clearing of what i have drew.in this code u can see that i made it on the mouse click/down and while moving it it will draw a line.
private shouldpaint as boolean = false
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
[code]......
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Dec 9, 2011
Trying to make a simple browser with some simple addon's. What Ive done is setup a menu(forum) for the user to enter their email providers web address and it will save it in a xml file. When they click on the email link, it should load the email xml iformation and place that info in the tb_html.text and navigate. I keep getting a null exception and im not sure what going on here. Here is the code:
Browsers:
Private Sub btn_Email_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Email.Click
'Load Action
Dim SavedEmailObj As Storage
[code].....
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Nov 10, 2009
I'm looking to make a simple install wizard to install my program (I know Visual Studio 2010 already has an installer) but anyway, I would like to make it myself, kind of line reinvent the wheel?
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