file write based on time of the day
guys,
I'm developing a vb.net app, where i have to do some specific task like writing in a file and changing a variable (and hence application reloading) [actually changing the app operation mode and relaunching on the updated operation mode] based on a specific time of a day. Means, on 2AM daily, the app will do some task. And also on 6AM daily, the app will do another set of task. This can not be done by windows task scheduler but direct from the app. I need a guidance on how to achieve this?? I am thinking of using the system time and some other ways like timer polling for reading the time and on specific time defined, it will do the task. Any other better ideas, please advise me, so I can do that job!!!
Mishu~
Re: file write based on time of the day
Using a timer is a good way to go, you can either set the interval so that it only fires at the specific time (which takes slightly less code, and slightly less resources), or you can have it check a bit more often (which avoids issues like daylight savings changes).
Note however that if you are checking the time in the timer then you shouldn't be checking for it being exactly a specific time, but whether it is at least that time, because the timer might not fire at the exact second you want (because timers are low priority, and can therefore be delayed).
Re: file write based on time of the day
OK, but then i also need to check the CURRENT SYSTEM TIME right?? I mean a timer will fire to check the time and if it is that time (or a few minutes crossed) [like 4:00PM] then it will do the task. and the other time (same timer) will check the other TIMESTAMP for the same thing... right???
at this time, i am showing the current time using a timer firing per second... changing the label text with values from system time. This will be same like right??
Re: file write based on time of the day
Yes, but you don't actually need to show the system time to compare it to the time you want to check.
Re: file write based on time of the day
no no no... i'm not saying that... i'm saying that the same way as we do to show system time on app....
there we use per second interval, and here we can avoid if that is not that mission critical right?
Re: file write based on time of the day
If you don't need it to the exact second then you can use a longer interval, and that would be better as it uses fewer resources.
Re: file write based on time of the day
Hi,
here somthing you can perhaps use..
you have to adjust the Times
Code:
Option Strict On
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.Text = GetTimeOfDay(Now)
End Sub
Private Function GetTimeOfDay(ByVal TimeToDoSomething As Date) As String
Select Case Format(TimeToDoSomething, "hh:nn:ss")
Case "06:00:00" To "11:59:59"
GetTimeOfDay = "Morning"
'do something
Case "12:00:00" To "15:59:59"
GetTimeOfDay = "Noon"
'do something
Case "16:00:00" To "17:59:59"
GetTimeOfDay = "Afternoon"
'do something
Case "18:00:00" To "21:59:59"
GetTimeOfDay = "Evening"
'do something
Case Else
End Select
End Function
End Class
regards
Chris
Re: file write based on time of the day
hi chris!! nice.. but I'm a bit unsure if that may help...
well, i have a subroutine that needs to run for once for the whole time (but surely have to run).
Code:
Public Sub changeOPSMode()
If (TimeOfDay > #23:50:00#) Then
opsMode = 3
UpdateConfFile()
ProcessOpsMode()
ElseIf (TimeOfDay > #16:50:00#) Then
opsMode = 1
UpdateConfFile()
ProcessOpsMode()
End If
This is my subroutine. Now as you can see, I have two times, on 23:50 I have to execute the two other subs ONLY for once. I cant use the equal sign ass it may fail if it misses the second for some reason (or I have to actually make a precise interval (per sec) timer and i am not going to to it... as i already have a timer for 30sec interval for doing another job and that is all enough.) and for other timeit's the same... any ideas??
Re: file write based on time of the day
Hi,
try this, you still have to do a bit work with setting the Times
when opening the Form the Action starts, I just set the two LogActions too a couple of seconds so
you can see whats going on.
what you still have to do is work out the Timespan from when starting (Date.Now)
to the Time the Action is suposed to take place. I just HardCoded the 5 and 20sec. Actions
put this in a Class..named clsCountdown
Code:
Public Class clsCountDown
Private WithEvents m_Timer As New Timer
Private m_CountDown As Date
Public Event CountDown(ByRef NextCountDow As Date)
Public Property IntervallCheck() As Integer
Get
Return m_Timer.Interval
End Get
Set(ByVal value As Integer)
m_Timer.Interval = value
End Set
End Property
Public Property NextCountDown() As Date
Get
Return m_CountDown
End Get
Set(ByVal value As Date)
m_CountDown = value
End Set
End Property
Public Sub New()
End Sub
Public Sub New(ByVal mNextCountDown As Date, ByVal mIntervallCheck As Integer)
m_CountDown = mNextCountDown
m_Timer.Interval = mIntervallCheck
m_Timer.Start()
End Sub
Public Sub StartCheck()
m_Timer.Start()
End Sub
Public Sub StopCheck()
m_Timer.Stop()
End Sub
Private Sub m_Timer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles m_Timer.Tick
If m_CountDown <= Date.Now Then
Dim d As Date = Date.Now
RaiseEvent CountDown(d)
m_CountDown = d
End If
End Sub
End Class
put this in a Modul..
this is where you add your Actions
Code:
Module Module1
Public cCountDown1 As clsCountDown 'your Action No.1
Public cCountDown2 As clsCountDown 'your Action No. 2
'etc...
End Module
and this in a Form..
you need 2 Listboxes, 3 Labels
and add another 2 Foms , just so that you see an Action is fired
Code:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Log1 As Date = Date.Now
Dim log2 As Date = Date.Now
Log1 = Log1.AddSeconds(5)
log2 = log2.AddSeconds(20)
cCountDown1 = New clsCountDown(Log1, 1000)
cCountDown2 = New clsCountDown(log2, 1000)
AddHandler cCountDown1.CountDown, AddressOf Me.CountDown
AddHandler cCountDown2.CountDown, AddressOf Me.CountDown2
End Sub
Private Sub CountDown(ByRef NextCountDown As Date)
Label1.Text = Date.Now.ToString
Dim Log1 As Date = Date.Now
Log1 = Log1.AddSeconds(5)
NextCountDown = Log1
Form2.Show() 'your Action, in this case open a Form after the 5sec.
ListBox1.Items.Add("Nextaction : " & Log1)
Label2.Text = NextCountDown
End Sub
Private Sub CountDown2(ByRef NextCountDown As Date)
Label1.Text = Date.Now.ToString
Dim Log2 As Date = Date.Now
Log2 = Log2.AddSeconds(20)
NextCountDown = Log2
Form3.Show() 'your Action, in this case open a Form after the 20sec.
ListBox2.Items.Add("Nextaction : " & Log2)
Label3.Text = NextCountDown
End Sub
End Class
regards
Chris
Re: file write based on time of the day
Quote:
Originally Posted by
ChrisE
Hi,
try this, you still have to do a bit work with setting the Times
when opening the Form the Action starts, I just set the two LogActions too a couple of seconds so
you can see whats going on.
what you still have to do is work out the
Timespan from when starting (Date.Now)
to the Time the Action is suposed to take place. I just HardCoded the 5 and 20sec. Actions
put this in a Class..named clsCountdown
Code:
Public Class clsCountDown
Private WithEvents m_Timer As New Timer
Private m_CountDown As Date
Public Event CountDown(ByRef NextCountDow As Date)
Public Property IntervallCheck() As Integer
Get
Return m_Timer.Interval
End Get
Set(ByVal value As Integer)
m_Timer.Interval = value
End Set
End Property
Public Property NextCountDown() As Date
Get
Return m_CountDown
End Get
Set(ByVal value As Date)
m_CountDown = value
End Set
End Property
Public Sub New()
End Sub
Public Sub New(ByVal mNextCountDown As Date, ByVal mIntervallCheck As Integer)
m_CountDown = mNextCountDown
m_Timer.Interval = mIntervallCheck
m_Timer.Start()
End Sub
Public Sub StartCheck()
m_Timer.Start()
End Sub
Public Sub StopCheck()
m_Timer.Stop()
End Sub
Private Sub m_Timer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles m_Timer.Tick
If m_CountDown <= Date.Now Then
Dim d As Date = Date.Now
RaiseEvent CountDown(d)
m_CountDown = d
End If
End Sub
End Class
put this in a Modul..
this is where you add your Actions
Code:
Module Module1
Public cCountDown1 As clsCountDown 'your Action No.1
Public cCountDown2 As clsCountDown 'your Action No. 2
'etc...
End Module
and this in a Form..
you need 2 Listboxes, 3 Labels
and add another 2 Foms , just so that you see an Action is fired
Code:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Log1 As Date = Date.Now
Dim log2 As Date = Date.Now
Log1 = Log1.AddSeconds(5)
log2 = log2.AddSeconds(20)
cCountDown1 = New clsCountDown(Log1, 1000)
cCountDown2 = New clsCountDown(log2, 1000)
AddHandler cCountDown1.CountDown, AddressOf Me.CountDown
AddHandler cCountDown2.CountDown, AddressOf Me.CountDown2
End Sub
Private Sub CountDown(ByRef NextCountDown As Date)
Label1.Text = Date.Now.ToString
Dim Log1 As Date = Date.Now
Log1 = Log1.AddSeconds(5)
NextCountDown = Log1
Form2.Show() 'your Action, in this case open a Form after the 5sec.
ListBox1.Items.Add("Nextaction : " & Log1)
Label2.Text = NextCountDown
End Sub
Private Sub CountDown2(ByRef NextCountDown As Date)
Label1.Text = Date.Now.ToString
Dim Log2 As Date = Date.Now
Log2 = Log2.AddSeconds(20)
NextCountDown = Log2
Form3.Show() 'your Action, in this case open a Form after the 20sec.
ListBox2.Items.Add("Nextaction : " & Log2)
Label3.Text = NextCountDown
End Sub
End Class
regards
Chris
Too much complex!!
Still let me study it...
