At 9:37 AM -0700 1999/04/17, [EMAIL PROTECTED] wrote:
>Is there a way, without hacking on the Palm OS code, to get a "notification"
>(Application launch) when the system is about to enter "sleep mode" ?
>Likewise, can I get a "notification" that the system has just went into
>"running mode"?
>
>I will humbly accept pointers to documentation or faq's that address this
>question. I have tried the Palm published faq's and went through the Palm
>development documentation and at this point I'm starting to think it is not
>possible.
You're more or less correct -- without hacking there is no way for an application to
reliably detect the sleep/wake cycle. There is one for shared libraries, but the issue
there is the API can be called at interrupt time, which prevents your app from doing
things like allocating memory or calling user interface routines. So really it's of
limited utility -- it was designed for hardware-twiddling actions like powering off a
serial port, for example.
If you're only concerned about 'noticing' the sleep and wake in your application, you
can look for the hardPowerChr command key event before passing it to SysHandleEvent.
That should catch most non-emergency sleep/wake cycles, as SysHandleEvent calls
SysSleep when the hardPowerChr command key occurs, and SysSleep doesn't return until
there's a reason for the device to wake up again.
Keep in mind this path isn't guaranteed to be the ONLY path to SysSleep, however. Some
3rd party hacks call SysSleep directly. Similarly, SysSleep may be called directly by
the OS when there's a power-loss emergency, to protect the contents of RAM.
On slightly brighter news, this is one of the areas we've been considering expanding a
bit via the notification manager...
Regards,
Jim Schram
3Com/Palm Computing
Partner Engineering
