simple question about backlight
in [Compact Framework]
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From: bule on 8 Feb 2007 07:04 hi all i have this problem... i have set that my backlight's PDA turn off after 30 sec. then i have made a simple program wich after 60 sec call the SetPowerRequirement's API setting the backlight power to full on (device state =0). so the behaviour is this : time 0 start the experiment time 30 sec the backlight turn off time 60 sec the backlight turn on but time 90 sec : the backlight doesn't turn off, it is as the PDA has lost the information about turning on th light after 30 sec of inactivity so my question is how can i turn on the light but then make the PDA behave like before i have call the SetPowerRequirement? i have tried to call the relasePowerRequirement but if i call this the backlight turn off.. i hope somone can help me...
From: Peter Foot [MVP] on 8 Feb 2007 08:42 You'd need to call ReleasePowerRequirement after 30 seconds of calling SetPowerRequirement. By releasing the power requirement you allow the device to go back to what it should be doing and it should already be off so it turns off immediately. An alternative is to use a different method to wake up the screen and still use the existing timeout method, such as sending some key input etc Peter -- Peter Foot Device Application Development MVP www.peterfoot.net | www.inthehand.com "bule" <bule(a)discussions.microsoft.com> wrote in message news:96E58D09-E330-427C-9033-A20E5BB03A6E(a)microsoft.com... > hi all i have this problem... > > i have set that my backlight's PDA turn off after 30 sec. > > then i have made a simple program wich after 60 sec call the > SetPowerRequirement's API setting the backlight power to full on (device > state =0). > > so the behaviour is this : > time 0 start the experiment > time 30 sec the backlight turn off > time 60 sec the backlight turn on > > but time 90 sec : the backlight doesn't turn off, it is as the PDA has > lost > the information about turning on th light after 30 sec of inactivity > > so my question is how can i turn on the light but then make the PDA behave > like before i have call the SetPowerRequirement? i have tried to call the > relasePowerRequirement but if i call this the backlight turn off.. > > i hope somone can help me...
From: bule on 8 Feb 2007 09:26 thanks for the quickly response... i'd like to use the existing timeout and so how can i simulate a screen touch? is there any API? thinking about i have also found that after calling the setPowerRequirement i change the register key HKEY_current_user\\controlPanel\\Backlight BatteryTimeout from 30 to 0...so if after calling the setPowerrequirement i change the register key to 30 and then i create a BacklightChangeEvent can i re-set the previous timeout? but i think this solution is alittle bit more cumbersone that simulate a screen touch "Peter Foot [MVP]" wrote: > You'd need to call ReleasePowerRequirement after 30 seconds of calling > SetPowerRequirement. By releasing the power requirement you allow the device > to go back to what it should be doing and it should already be off so it > turns off immediately. An alternative is to use a different method to wake > up the screen and still use the existing timeout method, such as sending > some key input etc > > Peter > > -- > Peter Foot > Device Application Development MVP > www.peterfoot.net | www.inthehand.com > > "bule" <bule(a)discussions.microsoft.com> wrote in message > news:96E58D09-E330-427C-9033-A20E5BB03A6E(a)microsoft.com... > > hi all i have this problem... > > > > i have set that my backlight's PDA turn off after 30 sec. > > > > then i have made a simple program wich after 60 sec call the > > SetPowerRequirement's API setting the backlight power to full on (device > > state =0). > > > > so the behaviour is this : > > time 0 start the experiment > > time 30 sec the backlight turn off > > time 60 sec the backlight turn on > > > > but time 90 sec : the backlight doesn't turn off, it is as the PDA has > > lost > > the information about turning on th light after 30 sec of inactivity > > > > so my question is how can i turn on the light but then make the PDA behave > > like before i have call the SetPowerRequirement? i have tried to call the > > relasePowerRequirement but if i call this the backlight turn off.. > > > > i hope somone can help me... >
From: " ctacke/>" on 8 Feb 2007 09:58 Use SystemIdleTimerReset -- Chris Tacke - Embedded MVP OpenNETCF Consulting Managed Code in the Embedded World www.opennetcf.com -- "bule" <bule(a)discussions.microsoft.com> wrote in message news:D90A2C2E-7763-4939-B6FF-786DBBBD7259(a)microsoft.com... > thanks for the quickly response... > i'd like to use the existing timeout and so how can i simulate a screen > touch? > is there any API? > > thinking about i have also found that after calling the > setPowerRequirement > i change the register key HKEY_current_user\\controlPanel\\Backlight > BatteryTimeout from 30 to 0...so if after calling the setPowerrequirement > i > change the register key to 30 and then i create a BacklightChangeEvent can > i > re-set the previous timeout? > > but i think this solution is alittle bit more cumbersone that simulate a > screen touch > > > > "Peter Foot [MVP]" wrote: > >> You'd need to call ReleasePowerRequirement after 30 seconds of calling >> SetPowerRequirement. By releasing the power requirement you allow the >> device >> to go back to what it should be doing and it should already be off so it >> turns off immediately. An alternative is to use a different method to >> wake >> up the screen and still use the existing timeout method, such as sending >> some key input etc >> >> Peter >> >> -- >> Peter Foot >> Device Application Development MVP >> www.peterfoot.net | www.inthehand.com >> >> "bule" <bule(a)discussions.microsoft.com> wrote in message >> news:96E58D09-E330-427C-9033-A20E5BB03A6E(a)microsoft.com... >> > hi all i have this problem... >> > >> > i have set that my backlight's PDA turn off after 30 sec. >> > >> > then i have made a simple program wich after 60 sec call the >> > SetPowerRequirement's API setting the backlight power to full on >> > (device >> > state =0). >> > >> > so the behaviour is this : >> > time 0 start the experiment >> > time 30 sec the backlight turn off >> > time 60 sec the backlight turn on >> > >> > but time 90 sec : the backlight doesn't turn off, it is as the PDA has >> > lost >> > the information about turning on th light after 30 sec of inactivity >> > >> > so my question is how can i turn on the light but then make the PDA >> > behave >> > like before i have call the SetPowerRequirement? i have tried to call >> > the >> > relasePowerRequirement but if i call this the backlight turn off.. >> > >> > i hope somone can help me... >>
From: bule on 8 Feb 2007 10:23
i have read about the SystemIdleTimerReset but it will not resolve my problem... i am searching to turn on light if something happen...i don't want to turn on light always: if the light is off and something happens: turn on the light but if the light is off and nothing happens no problem... i'd like to have a behaviour as a cell phone : if a message arrive so turn on the light, if noo message arrives keep the light off... i halso have tried this to weak up scree : mouse_event(MOUSEEVENTF.LEFTDOWN|MOUSEEVENTF.ABSOLUTE,61439,1638,0,0); but no succes i see the tap on the screen but no light... |