How to prevent user to power off the PDA
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From: Harmon on 30 Aug 2006 07:40 Thank you, I'll have a try! "Yaroslav Goncharov" wrote: > To prevent device from suspending when user clicks the power button enter > the unattended mode: > > PowerPolicyNotify ( PPN_UNATTENDEDMODE , TRUE ) > > Don't forget to exit unattended mode once you are done with the critical > part of your program. > > -- > Yaroslav Goncharov > Spb Software House, http://spbsoftwarehouse.com > Pocket PC Developer Network, http://pocketpcdn.com > > > "Harmon" <Harmon(a)discussions.microsoft.com> wrote in message > news:61D45948-96FA-4381-9789-F8D5DC25B6B7(a)microsoft.com... > > Dear all, > > > > I'm working with a communication program. I found if I power off the PDA > > when my program is in 'talking' state (sending and receiving RTP packets > > using socket), the system will freeze and dead when I power on. So I > > decide > > not to allowed power off during talking. > > > > I could use SystemIdleTimerReset() to disable auto power off, but I don't > > know how to prevent the manual power off. I know there must be a way, > > because > > I see Tomtom could do it. Could anyone give me a hint? > > > > Thanks in advance! > > > > Yun > > > > >
From: eugn on 12 Sep 2006 04:32 First of all thank you for your attention and help! And please excuse me for my bad English. I've made a simple Win32 application which is increasing integer variable every WM_TIMER event and drawing out this counter on the screen. At the beginning of application (WM_CREATE) I've placed a call of PowerPolicyNotify (PPN_UNATTENDEDMODE ,TRUE) as you said. At the end (WM_DESTROY) - PowerPolicyNotify (PPN_UNATTENDEDMODE ,FALSE). Then I've started to observe for this counter powering on/off my PDA. When I'm powering off my device, the counter is increasing for 20-30 seconds and then stops (It is starting to increase from a 20-30 points greater value when I'm powering on again). I've expected an application will continue to work when device was powered off being in unattended mode. So, what am I doing wrong? Yaroslav Goncharov wrote: > To prevent device from suspending when user clicks the power button enter > the unattended mode: > > PowerPolicyNotify ( PPN_UNATTENDEDMODE , TRUE ) > > Don't forget to exit unattended mode once you are done with the critical > part of your program. > > -- > Yaroslav Goncharov > Spb Software House, http://spbsoftwarehouse.com > Pocket PC Developer Network, http://pocketpcdn.com > > > "Harmon" <Harmon(a)discussions.microsoft.com> wrote in message > news:61D45948-96FA-4381-9789-F8D5DC25B6B7(a)microsoft.com... > > Dear all, > > > > I'm working with a communication program. I found if I power off the PDA > > when my program is in 'talking' state (sending and receiving RTP packets > > using socket), the system will freeze and dead when I power on. So I > > decide > > not to allowed power off during talking. > > > > I could use SystemIdleTimerReset() to disable auto power off, but I don't > > know how to prevent the manual power off. I know there must be a way, > > because > > I see Tomtom could do it. Could anyone give me a hint? > > > > Thanks in advance! > > > > Yun > >
From: Yaroslav Goncharov on 12 Sep 2006 08:21
Yes, your application should continue working even if screen is off. I think that your device suspends because of idle suspend timeout, not because of the power button. Try to call SystemIdleTimerReset every 30 seconds to fix the problem. -- Yaroslav Goncharov Pocket PC Developer Network coordinator, http://pocketpcdn.com Spb Software House, http://spbsoftwarehouse.com "eugn" <greatsokol(a)gmail.com> wrote in message news:1158049979.472921.323380(a)e3g2000cwe.googlegroups.com... > First of all thank you for your attention and help! And please excuse > me for my bad English. > > I've made a simple Win32 application which is increasing integer > variable every WM_TIMER event and drawing out this counter on the > screen. > > At the beginning of application (WM_CREATE) I've placed a call of > PowerPolicyNotify (PPN_UNATTENDEDMODE ,TRUE) as you said. At the end > (WM_DESTROY) - PowerPolicyNotify (PPN_UNATTENDEDMODE ,FALSE). > > Then I've started to observe for this counter powering on/off my PDA. > > When I'm powering off my device, the counter is increasing for 20-30 > seconds and then stops (It is starting to increase from a 20-30 points > greater value when I'm powering on again). > > I've expected an application will continue to work when device was > powered off being in unattended mode. > > So, what am I doing wrong? > > Yaroslav Goncharov wrote: >> To prevent device from suspending when user clicks the power button enter >> the unattended mode: >> >> PowerPolicyNotify ( PPN_UNATTENDEDMODE , TRUE ) >> >> Don't forget to exit unattended mode once you are done with the critical >> part of your program. >> >> -- >> Yaroslav Goncharov >> Spb Software House, http://spbsoftwarehouse.com >> Pocket PC Developer Network, http://pocketpcdn.com >> >> >> "Harmon" <Harmon(a)discussions.microsoft.com> wrote in message >> news:61D45948-96FA-4381-9789-F8D5DC25B6B7(a)microsoft.com... >> > Dear all, >> > >> > I'm working with a communication program. I found if I power off the >> > PDA >> > when my program is in 'talking' state (sending and receiving RTP >> > packets >> > using socket), the system will freeze and dead when I power on. So I >> > decide >> > not to allowed power off during talking. >> > >> > I could use SystemIdleTimerReset() to disable auto power off, but I >> > don't >> > know how to prevent the manual power off. I know there must be a way, >> > because >> > I see Tomtom could do it. Could anyone give me a hint? >> > >> > Thanks in advance! >> > >> > Yun >> > > |