Re: Prevent Client from Sleeping

[Keisuke Miyako via 4D_Tech]

does not 4D already provide sleep detection with v16 and new network layer?

https://blog.4d.com/application-sleep-notification/

solutions such as this:

https://github.com/miyako/4d-plugin-system-notification/

should no longer be necessary.

---

c.f.

https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setthreadexecutionstate
https://developer.apple.com/documentation/foundation/nsactivityoptions?language=objc

---

also POST KEY is internal to 4D.

you need other means to post a system keydown event

https://github.com/miyako/4d-plugin-virtual-key

> 2019/08/08 2:59、Jim Medlen via 4D_Tech <4d_tech@lists.4d.com>のメール:
> I am trying to prevent clients from Sleeping when connected to a 4D server.




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Re: Prevent Client from Sleeping

[Chuck Miller via 4D_Tech]

The question is to why. I would think you just want to stop the drive from 
spinning down. Most companies hate when you do that as they want computer to 
lock after as short period of inactivity

On Mac there is a setting to stop drive from spinning down. I bet there is on 
windows as well

Regards

Chuck

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> On Aug 7, 2019, at 1:59 PM, Jim Medlen via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> I am trying to prevent clients from Sleeping when connected to a 4D server.

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Re: Prevent Client from Sleeping

[John DeSoi via 4D_Tech]

On the Mac you can use "caffeinate" via LEP.


NAME
 caffeinate -- prevent the system from sleeping on behalf of a utility

SYNOPSIS
 caffeinate [-disu] [-t timeout] [-w pid] [utility arguments...]

DESCRIPTION
 caffeinate creates assertions to alter system sleep behavior.  If no 
assertion flags are specified, caffeinate creates an assertion to prevent idle 
sleep.
 If a utility is specified, caffeinate creates the assertions on the 
utility's behalf, and those assertions will persist for the duration of the 
utility's
 execution. Otherwise, caffeinate creates the assertions directly, and 
those assertions will persist until caffeinate exits.

 Available options:

 -d  Create an assertion to prevent the display from sleeping.

 -i  Create an assertion to prevent the system from idle sleeping.

 -m  Create an assertion to prevent the disk from idle sleeping.

 -s  Create an assertion to prevent the system from sleeping. This 
assertion is valid only when system is running on AC power.

 -u  Create an assertion to declare that user is active. If the display 
is off, this option turns the display on and prevents the display from going 
into
 idle sleep. If a timeout is not specified with '-t' option, then 
this assertion is taken with a default of 5 second timeout.

 -t  Specifies the timeout value in seconds for which this assertion 
has to be valid. The assertion is dropped after the specified timeout. Timeout 
value
 is not used when an utility is invoked with this command.

 -w  Waits for the process with the specified pid to exit. Once the the 
process exits, the assertion is also released.  This option is ignored when used
 with utility option.



John DeSoi, Ph.D.


> On Aug 7, 2019, at 12:59 PM, Jim Medlen via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> Looking for ideas or thoughts on generating an event that will prevent the 
> client machine from sleeping?

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RE: Prevent Client from Sleeping

[Timothy Penner via 4D_Tech]

Hi Jim,

I am not sure that you will be able to effectively prevent the computer from 
sleeping.

Here are some examples that you will be unable to intercept:

- the user closes their laptop lid (the machine will most likely go to sleep - 
this is adjusted in power settings on Windows)

- the user selects SLEEP or STANDBY from the power/shutdown options (the 
machine will certainly go to sleep)

- the user uses the Windows Key + L key combination to lock the computer 
(moving the mouse or pasting keys will be ineffective if the machine is locked)

There may be others too.

-Tim



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Re: Prevent Client from Sleeping

[Chip Scheide via 4D_Tech]

Some ideas - none of these tested or tried :)

LEP - and use commands to bring the desktop to the fore and then 4D?
Move mouse to the menu bar, and post a click?

On launch of 4D use LEP to reset screen saver timeout, reset on quit
On launch of 4D use LEP to reset power timeout, reset on quit

LEP to open and then close a desktop window
open an off screen window (in 4D, with a web area), launch a connection 
to a safe url (apple or microsoft).

maybe even just touch the disk... pick a folder (desktop, or your 
database) and Get Document list
write an empty file to some safe location, and delete it.

Chip

On Wed, 7 Aug 2019 17:59:46 +, Jim Medlen via 4D_Tech wrote:
> 
> 
> To: 4d_tech@lists.4d.com
> From:   Jim Medlen
> Company:Functional Devices, Inc.
> Subject:Prevent Client from Sleeping
> Date:   Wednesday, August 7, 2019
> 
> 
>  Looking for ideas or thoughts on generating an event that will 
> prevent the client machine from sleeping?
> 
> I am trying to prevent clients from Sleeping when connected to a 4D server.
> 
> The POST KEY and POST EVENT both say "Its effect is as if the user 
> actually entered a character on the keyboard.”
> 
> but these events do not prevent the screen saver from activating.
> 
> It appears that the OS does not see this as a user event.
> 
> 
> Thanks,
> 
> Jim Medlen
> 
> Computer & Information Systems
> Functional Devices, Inc.
> j.med...@functionaldevices.com
> 
> Main:   (765) 883-5538 x 5735
> Direct: (765) 416-6835
> FAX:(765) 883-7505
> 
> http://www.functionaldevices.com
> 
> This email was transmitted on 100 percent recycled electrons
> 
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