How to prevent user to power off the PDA
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From: Harmon on 28 Aug 2006 13:00 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: " ctacke/>" on 28 Aug 2006 14:18 In many/most cases there is no way to intercept the interrupt generated by the push of the power button at an app level and therefore no way to disable it. You need to put in error handling to prevent a lockup from happening. You can get notified when the device is powered back up, which is sometimes useful, but that notification is unlikely to occur before other code begin executing again. -- Chris Tacke OpenNETCF Consulting Managed Code in the Embedded World www.opennetcf.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 29 Aug 2006 04:16 <ctacke/> пиÑ?ал(а): > In many/most cases there is no way to intercept the interrupt generated by > the push of the power button at an app level and therefore no way to disable > it. You need to put in error handling to prevent a lockup from happening. > You can get notified when the device is powered back up, which is sometimes > useful, but that notification is unlikely to occur before other code begin > executing again. May be there is a chance to create some kind of background process that could stay working when device being switched off?
From: " ctacke/>" on 29 Aug 2006 08:29 No. When the device is off, the processor is not running, and therefore nothing processes. You can set a notification to wake at some point in the future, but that's it. -Chris "eugn" <greatsokol(a)gmail.com> wrote in message news:1156839379.379648.236280(a)p79g2000cwp.googlegroups.com... <ctacke/> ?????(?): > In many/most cases there is no way to intercept the interrupt generated by > the push of the power button at an app level and therefore no way to > disable > it. You need to put in error handling to prevent a lockup from happening. > You can get notified when the device is powered back up, which is > sometimes > useful, but that notification is unlikely to occur before other code begin > executing again. May be there is a chance to create some kind of background process that could stay working when device being switched off?
From: Yaroslav Goncharov on 29 Aug 2006 11:31
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 > |