If you're in some sort of loop, you can just call
EvtResetAutoOffTimer() periodically for as long as you need to stay
awake...
Dave
On May 24, 2005, at 7:38 AM, Dr. Vesselin Bontchev wrote:
Hello folks,
While my application is working, it flashes various information on a
form and it's an annoyance if the device decides to go to sleep in the
middle of the process. What is the proper way of preventing that?
The Palm OS Programmer's Companion
http://www.palmos.com/dev/support/docs/palmos/PalmOSCompanion/
AppStartupAndStop.html#998079
suggests registering to receive notifications about the
sysNotifySleepRequestEvent even and then doing
((SleepEventParamType *) (notify->notifyDetailsP))->deferSleep++;
If I do that, the device indeed doesn't go to sleep for the duration
of the process. Unfortunately, it refuses to go to sleep after the
process has finished and I have unregistered with the Nitification
manager. Even the power button cannot turn the device off any more - I
have to reset it.
The Companion also says:
"After you defer sleep, your code is free to finish what it was doing.
When it is finished, you must allow the system to continue with the
sleep event. To do so, create a keyDownEvent with the resumeSleepChr
and the command key bit set (to signal that the character is virtual)
and add it to the event queue. When the system receives this event, it
will again broadcast the sysNotifySleepRequestEvent to all clients. If
deferSleep is 0 after all clients return, then the system knows it is
safe to go to sleep, and it broadcasts the sysNotifySleepNotifyEvent
to all of its clients."
It doesn't explain how exactly to do that. I tried the following:
EventType theEvent;
MemSet (&theEvent, sizeof (EventType), 0);
theEvent.eType = keyDownEvent;
theEvent.data.keyDown.chr = resumeSleepChr;
theEvent.data.keyDown.keyCode = 0;
theEvent.data.keyDown.modifiers = commandKeyMask;
EvtAddEventToQueue (&theEvent);
and it works - but *too* well, in the sense that it unconditionally
puts the device to sleep!
How can I do that properly, folks? I want the auto-off attempts to
fail while the process is going on - but I don't want to block the
power-off button and I don't want the device to go to sleep
immediately after the process has finished; I want it to do that only
if enough idle time has passed.
Or should I use some completely different approach? Like, messing up
with the auto-off settings (SysSetAutoOffTime), resetting the auto-off
timer (EvtResetAutoOffTimer) or something else like that?
http://www.palmos.com/dev/support/docs/palmos/PalmOSReference/
SystemEventManager.html#1071368
Regards,
Vesselin
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