Help with sleep

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

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
Question by:jeremiahscott
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 43

Accepted Solution

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

Expert Comment

ID: 6903076
Use Timer control and on timer event calculate if the time is come to do something.
Sleep is also good.

Expert Comment

ID: 6903079
Tim alredy explain :)
Instantly Create Instructional Tutorials

Contextual Guidance at the moment of need helps your employees adopt to new software or processes instantly. Boost knowledge retention and employee engagement step-by-step with one easy solution.

LVL 22

Expert Comment

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.

Expert Comment

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

Expert Comment

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)
LVL 15

Expert Comment

ID: 6903606
Sleep = Not good
Timer = vbOK And vbYes

Expert Comment

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.
LVL 22

Expert Comment

ID: 6903744
>Timer = vbOK And vbYes

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

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

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

Expert Comment

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.


Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I was working on a PowerPoint add-in the other day and a client asked me "can you implement a feature which processes a chart when it's pasted into a slide from another deck?". It got me wondering how to hook into built-in ribbon events in Office.
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…
Suggested Courses
Course of the Month5 days, 18 hours left to enroll

626 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question