I'm trying to enable a timer from a SerialPort_DataReceived event. I can see that the timer is enabled, but the event does not fire. It's rather simple, but I need some help understanding why it doesn't run the code in TimerWait_Tick.
[code]...
So I just spent the last 4 hours trying to find out what was wrong with my code, just to find out that there's a bug in this version or I just don't have enough knowledge of VB2010 (I'm coming from VB6, this is my first program on 2010)I removed the rest of the code just to point out the problem, here it simply tries to enable the Timer1 when you receive data in the SerialPort1
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If Me.Timer1.Enabled = False Then
[code]....
After this I found that the code inside the Timer1 didn't run when the 100miliseconds passed, so I added a msgbox to see debug.
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If Me.Timer1.Enabled = False Then
[code]....
a program to receive SMSes automatically, i am using the serialPort_DataReceived event to detect any SMSes coming through the serialPort via a GSM modem, a delegate to update the mainform, i am able to receive SMSes, upon receiving the first SMS, the information in the SMS will be displayed in a messagebox. My problem is, consecutive SMSes received will display the first SMS information in the messagebox. From what i can see is that, my program is able to successfully poll SMSes but unable to display information of the SMS except the first one. Here are some codes i have done:
Imports System.Data.SqlClient
Imports System.data
Imports System.Drawing.Image
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Any thoughts on what might cause a thread error like this?Error:InvalidOperationException was unhandledCross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.
Relavent Code:
Private Sub SerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
[code].....
I have a timer on a page in ASP.NET.
After a certain period of time elapses, I want to disable the timer.
I want to put a static variable in the timers tick event that will track how many seconds have elapsed.
My question is, will this work?
If user X and Y are viewing the page will they both have separate local static variables?
What is the best method of shutting down an ASP.NET timer after a certain elapsed time?
I have a windows application that need to process som quite time consuming jobs. In my first try i did all processing under
the form thread. The result was bad response and update of the form due to the heavy jobs.To get around the problem with bad response from the form i created a new class "processing" where i put all the data processing. Then i instanciated a background worker where i in the "doWork" sub created a new instance of "processing".The "processing" class creates a timer from system.timer, and the timer drives the processing.On the Timer event Elapsed the timer starts a new thread from the thread pool.
My problem is now when i want to asynchronously close the background worker (with the corresponding function call what ever it is called ...) there is still a timer thread out there that causes exceptions for me.
1. How can i close my background worker and at the same time have the timer to be stopped?
2. Is there a way to synchronize the timer event so that the timer executes from the background worker thread?
3. Is there a better approach for me to adapt?
When a button is clicked on my forum i need it to enable a timer that has a RANDOM inverval. how to do it or give an example. (im trying to create an autotyper that types a given phrase at random times)
View 5 RepliesI want to create an array of timer in vb.net. My problem is that how will i raise the tick event for a particular timer, say mytimer(x).tick and inside the tick event there is also a button, say mybutton(x) which changes location every interval. for example:
public class blah
dim mybuttons(20) as button
dim mytimer(20) as timer
private sub form_load(....) handles me.load
for x as integer = 0 to 20
[Code]...
i dont know what to do next, all i want is to pass the button mybuttons(x) to mytimer(x) tick event, in which their index number are the same. i want to create one timer per button. how to do that? please help me and post example codes. i've researched the net but i cant understand passing variables, addhandlers, etc. i'm just new to programming object oriented.
In my Windows Form's application, I enable and start a Windows Form's Timer for a state machine which interacts with various User Controls. In one part of the state machine where an external device is being rebooted, I need to disable the User Interface (a User Control's UI) for the time it takes the device to reboot. The problem exists in that once I use System.Threading.Sleep, the timer that fires the State Machine stops and never restarts. I even re-enabled the Timer and re-started it after the Sleep command but to no avail. Is this expected operation or should a Windows Form's Timer be able to restart after a Sleep?
Snippet of code from a step in the state machine below:
Cursor.Current = Cursors.WaitCursor
MainForm.Enabled = False
System.Threading.Thread.Sleep(8000)
MainForm.Enabled = True
Cursor.Current = Cursors.Default
MainForm.t1.Enabled = True
MainForm.t1.Start()
how to enable /disable the timer with a button and how enable /disable the timer with a checkbox? and the opposite how to enable /disable a button with a timer and how to enable /disable a checkbox with a timer
View 5 RepliesI am wondering if there is any code guide to teach me how to enable the user to draw as many buttons as possible on the windows form and be able to move and resize the buttons on the GUI and also tie the buttons to the timer to toggle the button colour when ever a condition is true
View 5 RepliesEg. ""vb.net" timer event trigger on purpose". This application is meant to run at all times to download a web page every minute. To avoid freezing the UI, I read that the best solution is to move the code from a While/Sleep loop to a Timer that will be triggered every minute. The problem I have, is that the user must wait for a minute before the event is triggered:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Timer1.Interval = 60000
Timer1.Enabled = True
[CODE]...
Is it possible to force this event to occur instead of waiting for it?
I populate a DataGridView during a sub routine. Later in my code I have a RowEnter event for that DataGridView when the user is assessing it after it has been populated during the main procedure. However this RowEnter event gets fired while the DGV is being populate. I only want it to file AFTER its populated. Is it possible to disable this specific event while the DGV is being populated? I really want the user to have the ability to cursor up/down the DGV and see affects of the RowEnter Event. I know I can also use the CellEnter event but it does not have the same effect.
View 4 RepliesWe Could Easily Called A Functions By Pressing Enter In keypress Event. On textbox in vb.net. Eg.:-
If e.KeyChar = Microsoft.VisualBasic.ChrW(13) Then
Call Fsn()
End If
But. I can not called the functions on ComboBox. IN similar fashion. please help me to called a Funtion when we press ENTER IN ComboBox.
im looking for some code that can enable a e.keyvalue event when a player hits an object on form but i also want the form to load with the e.keyvalue event disabled
View 6 RepliesI already created a button "enjoy button" that i want to move in a form when the "timer start button" is clicked. how do link the timer to the "timer start button" and make it move?
this is what i tried so far..then am blank first
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i want to execute different subs at each tick , is that possible ?
View 1 RepliesWe have a question regarding VB.Net 2008. We are used control array in vb.net and third party timer controls. When handle received from external application to timer control event procedure, after this form becomes blank and controls disappear. What we have to do to persist the controls.
View 1 RepliesI already created a button "enjoy button" that i want to move in a form when the "timer start button" is clicked. how do link the timer to the "timer start button" and make it move?this is what i tried so far..
blankfirst-------------------------------------------------------------------------------Public Class MainForm Dim DX As Integer Dim DY As Integer Dim X As Integer Dim Y As Integer Dim Counter As Double Dim Y1 As Integer Dim Y2 As Integer Dim X1 As Integer Dim X2 As Integer------------------------------------then-------------------------------------------------------------
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I 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 a For Loop, how can I convert that by using Timer event. I want to use Timer so I can add a 5 sec, 10 sec and 15 sec pause (interval) for each every loop. [code]
View 1 RepliesI'm a starter in VB I just need to Know how to add elapsed event to timer in VB 2005 The timer has only Tick event
( if that not in vb 2005 what version of vb that supports the elapsed event )
I am currently developing an application in which I would make a form full size automaticly.On the location where I set the time parameters, lets say, I want an event to occur every 2 hours, in which the event would be a form becoming full-sized and, on that form a clock which would show that the form will resize on its original state after lets say, 15 minutes.And also I would like to disable the Windows Start keys.I tried some codes but they were for an event if the key is pressed.For this I need the keys to be disabled as soon as I start my application.For the full size form I have used this code:
Me.Height = My.Computer.Screen.WorkingArea.Height
Me.Width = My.Computer.Screen.WorkingArea.Width
Me.WindowState = FormWindowState.Maximized
Me.FormBorderStyle = Windows.Forms.FormBorderStyle.None
I have a program that a textbox pops up for 30 sec. What I want to do is this: Have it go away after 30 sec if the user does not enter anything in it and hit return of click the ok button. But if they DO I want the timer to reset back to 30 sec. I have tried disabling and enabling the timer event--- sending a new interval, and spent some time looking in the Forums.
View 2 RepliesI already created a button "enjoy button" that i want to move in a form when the "timer start button" is clicked. how do link the timer to the "timer start button" and make it move? this is what i tried so far..then am blank first
Private Sub MainForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[CODE]...
I'm trying to create a simple media player that will scan a directory for certain filetypes, add them to a playlist then play a random playlist entry - changing every x seconds.I figured this would be simple in VB and, to an extent it was. I have the code running that chooses the directory and plays the random file.I just need to now make this repeat every 30 seconds or so.I have all the coded attached under the sub for the 'open' function of the player so it's quite flat. I think I need to use a timer here, to trigger the routine to pick and play the media every 30 seconds?In doing this I think I need to break the variables out of the function I currently have as they need to be shared between the timer loop function and the central 'creating file list' function.
I'm having trouble - I'm no coder (as you'll tell!) and although getting this far was easy I'm now (I think) bumping into threading / variable scope issues which are a bit of a brick wall.I've tried making the variables public / global by declaring in the class rather than the sub but I get errors at runtime. Presumably because of how I'm creating the windows media objects? [code]
Why after you pressed the button Button1, this application crashes without considering the event timer1??
Public Class Form1
Public timer_event As Boolean
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
timer_event = False
Timer1.Interval = 3000 '3 sec
[Code] .....
This application is meant to run at all times to download a web page every minute.To avoid freezing the UI, I read that the best solution is to move the code from a While/Sleep loop to a Timer that will be triggered every minute.The problem I have, is that the user must wait for a minute before the event is triggered:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Timer1.Interval = 60000
Timer1.Enabled = True
[code]....
Is it possible to force this event to occur instead of waiting for it?
Is there a way to adjust the timer event of the default splashscreen?
View 1 RepliesI'm developing this procedure using a timer object. The thing is the procedure is not in the timer's event procedure but I want it to depend on the timer's interval when executing, it's just not calling the timer procedure. How can u declare objects and use their event procedures in code.
View 2 Replies