I have created a real time elapsed clock that synchronizes with the computer time and is being displayed in a Label.
Now, my doubt is how to display the clock in this Label in the "hh:mm:ss" format.
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles Me.Load
ElapseStartTime = DateTime.Now
Timer1.Enabled = True
Timer1.Interval = 1000
Timer1.Start()
End Sub
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
Dim ElapsedTime = DateTime.Now.Subtract(ElapseStartTime)
LB_Timer.Text = String.Format("{0} : {1} : {2}", ElapsedTime.Hours, ElapsedTime.Minutes, ElapsedTime.Seconds)
End Sub
Thanks in advance!
Since DateTime.Subtract returns a TimeSpan structure, you can use the TimeSpan.ToString(Format) method to format the output string:
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
LB_Timer.Text = Date.Now.Subtract(ElapseStartTime).ToString("hh\:mm\:ss")
End Sub
When targeting a .Net Framework < FW 4.0, use the parameter-less, culture-insensitive TimeSpan.ToString() method.
LB_Timer.Text = Date.Now.Subtract(ElapseStartTime).ToString().Substring(0, 8)
From the Docs:
Support for formatting TimeSpan values was added in the .NET Framework
4. However, the ToString() method overload remains culture-insensitive. Its behavior remains unchanged from previous
versions of the .NET Framework.
just i found this could help! {0:d2}
LB_Timer.Text = String.Format("{0:d2}:{1:d2}:{2:d2}", ElapsedTime.Hours, ElapsedTime.Minutes, ElapsedTime.Seconds)
Related
I need to know the value of time. I mean the interval of time; from starting time to ending time. Anyone can help? :(
This is my list and I want to get the interval value of time.
When I select the item/record in the Datagridview2 it will displayed here
Can somebody share an idea/or code? Thanks
To achieve something like this, you need the TimeSpan data type.
In my example, a variable is written with the current time at the beginning of the runtime.
A timer regularly calculates the new time span between time 1 and the current time, and outputs this time span in a text box.
Also, I use CultureInfo (I always do, don't be surprised) and I use PadLeft to have leading zeros. Looks nicer.
Public Class FormMain
Private ReadOnly Starttime As Date = Date.Now
Private ReadOnly Deu As New System.Globalization.CultureInfo("de-DE")
Private Sub FormMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Timer1.Start()
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Dim TS As TimeSpan = Date.Now - Starttime
TextBox1.Text = TS.Minutes.ToString(Deu).PadLeft(2, "0"c) & ":" & TS.Seconds.ToString(Deu).PadLeft(2, "0"c)
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Timer1.Stop()
End Sub
End Class
In my application i have a label that displays the current time in HH:mm:ss
How can i get the label to update its content each second so that the time actually is correct?
Add a Timer to your project. Set the Interval property to 1000. Then...
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Label1.Text = 'Your code
End Sub
This is the scenario, I have three NumericUpDown for the values of second, minute and hour, And if a number is entered in the NumericUpDown i.e. 5, it will be converted to 5000 ms so my Timer can read it as 5 seconds. I'm trying to make a scheduler for every interval and this is my code:
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label13.Text = TimeSpan.FromSeconds(Form3.NumericUpDown1.Text).TotalMilliseconds
Label14.Text = TimeSpan.FromMinutes(Form3.NumericUpDown2.Text).TotalSeconds
Label15.Text = TimeSpan.FromHours(Form3.NumericUpDown3.Text).TotalMinutes
Dim times() As String = {Label13.Text, Label14.Text, Label15.Text}
For Each time In times
Dim interval As TimeSpan = TimeSpan.Parse(time)
Timer1.Interval = interval
MsgBox("hey")
Next
End Sub
And it has an error at Timer1.Interval = interval that says Timespan cannot be converted to Integer, and i can't think of any way to fix this, can you help me out? TIA~!
Try This
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Timer1.Stop()
Timer1.Interval = New TimeSpan(0, 0, CInt(nudMinutes.Value), CInt(nudSeconds.Value), CInt(nudMilliseconds.Value)).TotalMilliseconds
Timer1.Start()
End Sub
Here are some ideas to get you past your current error.
Dim tsTest As TimeSpan = TimeSpan.FromSeconds(NumericUpDownTest.Value)
Label1.Text = tsTest.TotalSeconds.ToString("n0")
Timer1.Interval = CInt(tsTest.TotalMilliseconds)
Start with just doing seconds and when that code works see if you can add the others.
I have little dummy software to test the precision of the stopwatch in visual basic. I've been told that visual basic has a real good timing, but I'm experiencing some strange behaviors.
This is ALL my code:
Imports System.IO
Public Class Form1
Public tmrTime As New Stopwatch
Dim currentDate As Date
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
tmrTime.Start()
End Sub
Private Sub Form1_KeyUp(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyUp
TextBox1.Text = (tmrTime.ElapsedTicks / Stopwatch.Frequency) * 1000
End Sub
Private Sub Form1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
TextBox2.Text = (tmrTime.ElapsedTicks / Stopwatch.Frequency) * 1000
End Sub
End Class
The problem si that if I take the non-decimal part of the two textbox (which is the absolute time of pressing and the abs. time of releasing) they are almost ALWAYS coupled, that is BOTH ODD or BOTH EVEN.
Do you know what's happening?
I have the same result using tmrTime.ElapsedMilliseconds or tmrTime.Elapsed.Ticks :-\
There is a good article about StopWatch/Timer precision in .Net here on a MSDN blog. If I correctly understand what you want to do, this should solve your problem:
Public Class Form1
Private _sw As New Stopwatch
Private Sub Form1_KeyDown(sender As Object, e As KeyEventArgs) Handles MyBase.KeyDown
_sw.Start()
End Sub
Private Sub Form1_KeyUp(sender As Object, e As KeyEventArgs) Handles MyBase.KeyUp
Dim elapsed As Long
elapsed = _sw.ElapsedTicks
_sw.Stop()
tbTicks.Text = (elapsed / Stopwatch.Frequency) * 1000
_sw.Reset()
End Sub
End Class
The code posted from Georg need a upgrade:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.KeyPreview = True
End Sub
I have a case where i need to generate millions of unique codes. For this I have created a generate function where the random number is generated. I call this function from a for loop and add the generated number on a list box. my code is as follow
for i=1 to val(txtnumber.txt)
mynum=generate()
next
I have created a lable on form where i wanted to display the no of secs elapsed while processing the loop. I used timer control as
timer1.start()
for i=1 to val(txtnumber.text)
mynum=generate()
listbox1.items.add(mynum)
next
timer1.stop
and on timer1_tick function
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label1.Text = Val(Label1.Text) + 1
End Sub
but when i click generate button, all numbers are generated, but timer doesnot shows time elapsed.
I may have missed something, so please help me out
This is probably best handled in a BackgroundWorker. Place one on the form and set its WorkerReportsProgress=True. Also, placing a million numbers in a ListBox probably isn't a good idea, so I omitted that.
Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Button1.Enabled = False
BackgroundWorker1.RunWorkerAsync()
End Sub
Private Sub BackgroundWorker1_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs) Handles BackgroundWorker1.DoWork
Dim started As DateTime = Now
For i As Integer = 1 To val(txtnumber.txt)
mynum=generate()
BackgroundWorker1.ReportProgress(i, Nothing)
Next
Dim ended As TimeSpan = Now.Subtract(started)
BackgroundWorker1.ReportProgress(0, ended.TotalSeconds.ToString)
End Sub
Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
If e.UserState IsNot Nothing Then
Label1.Text = e.UserState.ToString()
Else
Label1.Text = e.ProgressPercentage.ToString
End If
End Sub
Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
Button1.Enabled = True
End Sub
Your label should be updating correctly when the worker reports the ProgressChanged event.
What you're encountering is a threading issue. The work you are doing to generate the numbers is being executing by the UI thread, so it never gets a chance to update the screen. Take a look here: How to prevent UI from freezing during lengthy process?
This one might also have good information for you: Updating UI from another thread
Try this:
Private _Counter As Integer = 0
Private _StartTime As Date = Now
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
_StartTime = Now
_Counter = CInt(Val(txtnumber.Text))
ListBox1.Items.Clear()
Label1.Text = "0"
Timer1.Interval = 50
Timer1.Start()
End Sub
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
ListBox1.Items.Add(generate())
Label1.Text = New Date((Now - _StartTime).Ticks).ToString("HH:mm:ss.ff")
_Counter -= 1
If (_Counter <= 0) Then
Timer1.Stop()
End If
End Sub
Or you can research actual Threading.