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Resolved Use timer event without window

  1. How-to
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  1. iliyan iliev
    iliyan iliev
  2. PowerBuilder
  3. Thursday, 5 September 2019 08:04 AM UTC

It's possible to use timing object in app without window object ?!

App start schedule process and don't window and i use timer event to start process.

  1. Event
  2. Timer
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Responses (4)
René Ullrich
René Ullrich Accepted Answer Pending Moderation
  1. Thursday, 5 September 2019 12:00 PM UTC
  2. PowerBuilder
  3. # 1

Hi Iliyan,

I'm not sure what you want to do.

The timing object should run without a window.

But your application will not run without a window. If there is no open window after your applications open event finished your application will be automatically closed.

HTH,

René

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Roland Smith
  1. Roland Smith
  2. Thursday, 5 September 2019 13:28 PM UTC
A PowerBuilder program does not require a window. At a previous employer I wrote several windowless apps that ran on schedule once per night.

The main one created text files which were manually imported into our accounting software the next day.
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mike S
  1. mike S
  2. Thursday, 5 September 2019 13:30 PM UTC
to work without a window, the application open event would need to have a loop to keep it from closing.

i would also use sleep instead of timer since you want to release cpu cycles back to the OS.



do while true

sleep(60) //wake up every 60 seconds

of_runprocess()

loop



a window might be better since sleep would prevent your app from getting notifications to end until it wakes up



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Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Thursday, 5 September 2019 13:10 PM UTC
  2. PowerBuilder
  3. # 2

You could have your application with the timer running in the systemtray.

For example check these out:

http://www.topwizprogramming.com/freecode_icontray.html

There are other ways, like running your application as a service:

http://www.topwizprogramming.com/pbniserv.html

 

Maybe you can also just run your application with an invisible window, but then you'd have to find a way to end it properly.

HIH

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Michael Kramer
Michael Kramer Accepted Answer Pending Moderation
  1. Thursday, 5 September 2019 13:13 PM UTC
  2. PowerBuilder
  3. # 3

Hi,

Your app will run if you open a window having Visible = FALSE.

You may opt to make the window visible while you debug.

There is limit on how many TIMING objects can run at the same time within a single Windows O/S process. As far as I recall it used to be 15 or 16 when I checked about 20 years ago.

If you want to run a PB app as a Windows service you should consider one of the Windows service options available in the market. I have used PBNIServ from TopWiz Programming. I know there are other tools as well.

HTH /Michael

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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Thursday, 5 September 2019 15:11 PM UTC
  2. PowerBuilder
  3. # 4

Hi Iiyan;

  Yes & No ....

YES: The Timing object exists on its own and can interact with either visual or non-visual object classes

NO: A PB app cannot continue to run unless it has an open Window (unless its in a tight loop which in not efficient MS-Window resource wise - aka "poor design").

   So the key would be to have an open non-visible window that the timing object can interact with (or any of its controls or NVUO's that it instantiated).

HTH

Regards ... Chris

 

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iliyan iliev
  1. iliyan iliev
  2. Monday, 9 September 2019 08:22 AM UTC
It's possible convert PB app with non-vislable window do windows service with sc.exe or NSSM ?!
  1. Helpful
Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Monday, 9 September 2019 14:44 PM UTC
Hi Iliyan;

Absolutely .. I have been doing this with NSSM for over a decade! ;-)

Regards ... Chris
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