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Help with sleep

Posted on 2002-03-28
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Last Modified: 2012-05-04
hello-

i want my application to call a certain function every 10 minutes. while it is not doing anything i want it to sleep.

do i need to import the system32 sleep function? and will this keep it from using any resources while its idle? i mean, i just dont wanna keep running thru a loop.
any code would be great.

thanks - js
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Question by:jeremiahscott
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10 Comments
 
LVL 43

Accepted Solution

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TimCottee earned 100 total points
ID: 6903072
Use a timer control and set the interval to 60000 (MSec)

Check for elapsed time >= 10 minutes and there you go:

Dim dteLastRun As Date

Private Sub Timer1_Timer()
  If DateDiff("s",dteLastRun,Now()) > 600 Then
    'Run my routine
    dteLastRun = Now()
  End If
End Sub
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LVL 1

Expert Comment

by:COAtheGREAT
ID: 6903076
Use Timer control and on timer event calculate if the time is come to do something.
Sleep is also good.
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by:COAtheGREAT
ID: 6903079
Tim alredy explain :)
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LVL 22

Expert Comment

by:rspahitz
ID: 6903120
FYI--any use of the timer will create a thread that runs in the background, so it's still taking up processor time, but is minimal.  The only way to really overcome this is to have a hook into the Windows O/S that checks some flag every cycle through its processing, then "calls back" to the application at the proper time.  This is not worth the effort for something as simple as a timed event.
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Expert Comment

by:DanielBlais
ID: 6903135
Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
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LVL 18

Expert Comment

by:deighton
ID: 6903146
sleep is ok, but is seems to render your application 'not responding' on the task list if you sleep for a long peiod

sleep 600000   'for example (10 mins)
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Expert Comment

by:ameba
ID: 6903606
Sleep = Not good
Timer = vbOK And vbYes
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Expert Comment

by:trkcorp
ID: 6903707
If the sole purpose of your program is to execute this function periodically, and it need not do anything else, Sleep is fine and I suspect would use no more, perhaps less resource than the timer, if other actions need to take place then use the timer control.
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Expert Comment

by:rspahitz
ID: 6903744
>Timer = vbOK And vbYes

Ameba, you're funny, but...
vbOK=1
vbYes=6
vbOK And vbYes=0=False=Not True

So, if True=Good and False=Bad:
Sleep=Not good
Timer=Bad

-----
I'd use the timer control whenever feasible, and this seems feasible, but (from help):

The maximum, 65,535 milliseconds, is equivalent to just over 1 minute.

...
To go more than one minute, you'll probably want a counter, something like this:

' Module-level variable
Private m_intMinuteCounter as integer

Private Sub Form_Load()
  '...
  ' or move this to wherever you enable the timer
  m_intMinuteCounter = 0
End Sub

Private Sub Timer1_Timer()
  m_intMinuteCounter = m_intMinuteCounter + 1
  if m_intMinuteCounter >= 10 then
    Timer1.Enabled = False
    PerformDesiredTask' 10 minutes has elapsed
  end if
End Sub
0
 
LVL 5

Expert Comment

by:RainUK
ID: 6913296
If you want to use a timer other than VBs timer you can use the two APIs SetTimer, KillTimer. Use of these two API's will not inccur any processing by your program as the Timer Fire event is a call back procedure.

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