I am a newbie, but I am unable to get this code working. FileSweeper is supposed to start a timmer that triggers fileCopy on a web server. fileSweeoer is triggered by global.asax.ileCopy then will copy the filWould it make any difference if this was a class running on a web server?
Imports Microsoft.VisualBasic
Imports System
Imports System.Threading
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I have used system.timers.timer to watch several folders and move files in my windows service. But the timer event stops now and then. I have read that it is better to use system.threading.timer in services.This is my system.timers.timer
Private Timer As New System.Timers.Timer
AddHandler Timer.Elapsed, New System.Timers.ElapsedEventHandler(AddressOf Me.Timer_Elapsed)
Timer.Interval = 4000
Timer.Start()
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How do this code look like in system.threading.timer?How do i start and stop the timer using threading? That is very important because i stop the timer when it comes to the elapsed event and when the code har run it starts the timer again!
I have a Windows Service -which contains a System.Timer -which get enabled and started in the OnStart event handler.In the Timer Elapsed event -I make a call to a routine within another DLL. The problem is that the Timer Elapsed event never fires... I have a test application -which works fine. This is written in VB.Net 2008 framework 3.5
View 3 RepliesTrying to get System.Threading.Timer to work!! I am converting a small form based application to run as a services, The app just runs an monitors a folder and then when it finds a file to does some work on it. Having changed the form.timer to threading.timmer - The timer stopps working after a while. Below is a simple test services - when you look in to the text file it stops after approx 130 entries
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I have used timers in .Net for a long time now an never had this problem.Start timer to fire every 10 seconds that reads an object and updates the UI using a delegate.This works great until the form is minimized several times, then the timer thread seems to vanish.Anyone come across this before?
Obviously I can roll my own using a thread directly and sleeping it, however this seems like reinventing the wheel when a threading timer class exists already.
Code: Private Sub m_Tmr_Tick(ByVal state As Object)
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i have a project with 1 main form, in form load i call 4 subs which call data from an api. I have added a splashscreen from the add form menu. The splashscreen displays first while the main form loads(calling api data)What i would to do is have a progress bar on the splashscreen with the progress of the mainform load.
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
SplashScreen1.ProgressBar1.Value = 0
updategeneral()
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I'm wondering what exactly is the difference System.Timers.Timer and System.Windows.Forms.Timer???
View 4 RepliesI am looking to create a 500ms timer that I can use to make some text flash.Setting up the timer is straight forward enough, but I have not found an example of letting the timer create an exception so I do not have to poll it for a timeout.
View 1 RepliesI used a timer in my user control now when Timer_Tick event is fired I want to raise an event like Ticked. I created:
public delegate sub myDel()
public event myevnt as myDel
in Timer.Tick
I used raiseEvent myevnt. I also raised the event from a button click. This event is handled in a windows form where the control is used, My problem is event is firing when the button is clicked but not firing from the timer.tick. Is there any problem from Timer.Tick.
I have created a windows service and I have two different timer variables in there. 1st one fires off every 5 seconds and then does whats it is required to do. The second one fires every 30 seconds.
I make sure that when the function are getting executed I disable both the timers and enable once the function is complete.My problem is my second longer (30 second ) timer never fires only the first one is firing. I had created this service 3 months ago and it was working fine till now. But now I do not see the timers work properly in a simple windows app i created to test their workings.
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I have written below console application in VB.net. My intention is to write an application that triggers every one minute and perform some task. But when I run this application it is consuming 50% of CPU.
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When I run the following code in the UI thread, it works without issue.
VB.NET private timer as new timer public sub test()timer.enabled = true timer.interval = 1000 timer.start()addhandler timer.tick, addressof timer_tickend sub private sub timer_tick(...) messagebox.show("fff")end sub
But if I run it within a background thread, nothing happens.
I've been trying to get this part of my code to work but it hasn't done anything. I'm trying to create a function that sends an email everyday at a specific time. I thought threading.timer would work but i haven't figured it out yet. I don't get errors when its executed but it also does nothing. If someone could tell me whats going on with this piece of code,
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I need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16
Interval=10, Count=1000, Run time = 16 sec, msec per interval=15
Interval=100, Count=100, Run time = 11 sec, msec per interval=110
Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
I'm using a Threading.DispatcherTimer and every tick of the timer runs a subroutine. Is it possible that if the subroutine takes longer then 1s for the processor to finish that it will mess up the time of the timer that is counting in seconds?
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I'm in need of a "global" type timer that will allow me to basically run a clock the entire time someone is on my site, no matter what pages they go to. I've played around with the timer available for forms but I didn't see a way to make it continue to run after someone left that page.The effect I'm attempting to create is for a timer to start whenever someone hits my site, then every X minutes an event will trigger. This event should happen no matter where they are on the site. I've read a couple articles on timers but to be honest I'm fairly new to VB and I didn't know if I really needed to learn about 'threading' etc, to get a timer to work.
View 2 RepliesHere is the stack trace:
2012-03-16 19:15:09Z E System.NullReferenceException: Object reference not set to an instance of an object.
at System.Timers.Timer.set_Enabled(Boolean value)
at System.Timers.Timer.Stop()
Here's the code:
Timer declared as private member variable.
Private _myTimer As System.Timers.Timer
Initialize timer method.
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The timer has to have a value or else the Timer.Stop() call would be throwing the exception. This is a sporadic error and I'm just trying to see if anyone has experienced this before or if anyone has any ideas of what could be causing it. It is occuring in a WinForms application in the event handler for the Elapsed event of the Timer, but it is only occuring sporadically on the users computer. I haven't been able to reproduce the error myself.
I have the following code. My program loads 20 pictures in one panel and each pictures has for the moment like 500 Kb, but in the future they shall have like 2~6 Mb.When I use this part of code, my program that uses only 6 Mb of memory, but jumpes at 202 Mb when pics are loaded. I need a method to resize or make them thumbnail or something to reduce the memory.I don't know for the moment how to use the System.Threading, but I want to know if it shall help my program, if not, then help me replace parts of my code.Private Sub PanelPictures(ByVal picsoriz As Integer) ' picoriz represents how many pictures should the panel have on each row (it's set at 5 pictures per line/row) [code]
View 4 RepliesI'm developing an adding for office powerpoint application.I'm trying to display a description of the object(Customized object) currently dropped on the powerpoint slide in design mode(Design mode of the powerpoint).When i click on my addin the related object description will be displayed on a tabbed window as the first tabpage.
There is a button on the tab page, and when i click on it i need the description to get copied to windows clipboard.I tried this using clipboardclass it throws the following exception, System.Threading.ThreadstateException {"Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it."}
Code for clipboard:
Clipboard.Clear()
Clipboard.SetText(lblObjectID.Text)
I searched the net for a solution and got couple of answers like, Put [STAThread] in the main function Thread.CurrentThread.SetApartmentState(ApartmentState.STA) Immediately before your call to SetDataObject.
But I'm not sure where to put the 1st one and the 2nd option didn't work.
I have the below code in my ASP.net page:
Response.StatusCode = 404
Response.Write(strResult)
Response.End()
The code above throws "An exception of type 'System.Threading.ThreadAbortException' occurred and was caught."
I would like to discover the system.threading namespace. I look in the References -> Add -> .Net(tab) to add a reference to my project, but it is not listed in the .net references. I work with framework 3.5 service pack 1. How can I install this namespace?
View 4 RepliesI'm just looking for other people's thoughts and opinions on the way I have done something.I have a console application which needs to connect to various computers and reset the local admin password on each one. I got it all working but then decided that as there are a lot of PCs, it would be a good idea to use the thread pool to do a few at the same time.The problem is, I need this program to be run without any human interaction - so I cant just use ThreadPool.QueueUserWorkItem and pass it all of the computers to connect to, because then the program would exit after it had called QueueUserWorkItem for each one because there is nothing left for it to do. I cant stick a Console.ReadLine in there because like I said, it needs to be run automatically without anyone typing anything.
View 1 RepliesI have this little application that is using a System.Threading.Thread.Sleep, application runs great but Windows thinks the application is not responding even though it is running.
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What is the difference between creating a thead using BackgroundWorker and creating a thread using System.Threading.Thread?
View 2 RepliesI converted some c# code to vb.net and the converter.telerik.com turned this: i--; into this: System.Math.Max(System.Threading.Interlocked.Decrement(i), i + 1)Whats up with all the fancy-ness?
View 5 RepliesI am trying to send more than 1000 emails by using gmail host.It was sending only 158 or 160.I am serching for solution in google.In google I found some articles which has described that we cant send more than 200 mails by using gmail host and some articles said we can send more emails using Thread class.I am using vb.net(visual studio 2005) for developing sites.
View 6 RepliesWhat is the difference in using: BackgroundWorker1 or System.Threading.Thread
View 3 Repliesi trying to make ping system with port using multi-threading.. but seems i got error on label.. i still wonder why suddenly label become a problem..
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Multi threading in vb.net, in one of our program I provided an automatic error notification system that gives alert to my email when an exception error is occurred. The error notification includes the name of the form, the exception error details, the event name and the screenshot of the software during that particular instant.
View 6 RepliesI want to have My.Settings.Delay in seconds not milliseconds adding the 000 for the user. I tried My.Settings.Delay + 0 + 0 + 0. but can't sort how to do this.
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim var As Integer
Dim startVal As Integer
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