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The power state for individual hardware items in a Windows Mobile device can be set using SetDevicePower. You can also request that your program be started automatically during certain power change events. When you have an application that needs to run in unattended mode, use the native function PowerPolicyNotify to inform the OS that you need for the device to continue to run without suspending.

This is a reference-count API. GwesPowerOffSystem suspends the system. In either case, since the messages must be processed by GWES, the function calls will return, and a few more lines of code will execute before the system suspends.

If you need your system to stop doing work after calling this method, then make a call to Sleep. A group of Registry keys with numeric names will be found at that location. In the sample program CePowerState , I enumerate the hardware with the following code:. The sample program CePowerState will enumerate all of the hardware found in this location and allow you to directly set the power state of the hardware by calling SetDevicePower.

Setting the power state of the backlight to D0 will turn it on, and D4 will turn it off. If you are playing audio and set the power state of WAV1: to D4 , then the sound will no longer be heard until the power state is set back to D0.

This is the code that sets the device's power state. There are default device power settings for certain power states. For example, in unattended state, my Windows Mobile Professional phone turns off the backlight on the screen but keeps the sound adapter and the GPS receiver powered on. For each one of the power states, you will find a key. The contents of this key are string sub keys whose names match hardware on the device and whose value match a device power state so 0x04 matches D4 , which means a certain piece of hardware will be on at full power in the matching state.

Pocket PCs will automatically progress towards their suspended states if no user actions are detected. There are times at which you may need for a device to maintain its full power state even though the user isn't directly interacting with the system such as when listening to music with Windows Media Player. To prevent the system from powering down from being idle periodically, make calls to SystemIdleTimerReset.

Calling this function prevents the suspend timeout from being reached. The suspend timeouts can be changed on a system, so you will need to query for the suspend values and ensure that you call SystemIdleTimerReset on an interval shorter than the smallest suspend timeout value.

The suspend timeout values can be acquired by calling SystemParametersInfo. This function can be used to acquire the following three timeout values:. The timeout values can also be retrieved from the Registry.

The information provided will tell you whether or not the device is connected to an external power source and an estimate of the amount of power left in the primary and backup battery if present.

The accuracy of the battery metrics returned is dependent on the OEM. The top of the program displays the most important data on the battery: its current capacity, whether or not it is connected to an AC source, the battery's temperature, the voltage output, and the battery's current note that the sign on the current will change when the device is charging.

The Microsoft. SystemState class can also be used to monitor power state and receive notification of battery changes. The information available from the SystemState class is lower resolution it describes battery status in terms of Very Low, Low, Medium, High, and Very High, whereas the native function returns the batter power as a percentage. The SystemState class also does not return information on power consumption or battery temperature.

If you would like to ensure that your programs act responsibly and don't unnecessarily burn through the battery's power, then the best thing that your program can do is to stop performing work when no work needs to be performed. Sounds like common sense, doesn't it?

But, you would be surprised with the unnecessary amount of work that programs do when they could save power by doing nothing. The most common power burning pattern I came across in the support forums is continuous polling. An example of such an implementation follows:. The above code is written with the intention of running a long running process on another thread and waiting on it to complete in the main thread without impacting the responsiveness of the main thread.

If there is no work for the main thread to do, then the CPU is unnecessarily burning cycles waiting for the other thread to continue.

The better alternative is to have a background task signal. A thread needs to wait for an event to occur before moving on to perform the rest of its actions. Many developers will create a Boolean variable and will change its value when the other thread can continue.

The waiting thread pools this variable until it changes, then it continues its task. The waiting thread is unnecessarily polling a variable and burning through CPU cycles while not accomplishing any work. It means that the L Series has been Google-validated to deliver a powerful package of security and management capabilities, and provides the longevity required by businesses. Note: no guaranteed Android version updates after Oct; no guaranteed security updates after Sep; no guaranteed telephone or online support after Sep Four-part shell fitted with tough rubber corners seamlessly integrate into tablet design.

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Developer Guides Find training classes that describe how to accomplish a specific task with code samples you can re-use in your app. Sign in Sign up. Instantly share code, notes, and snippets. Created May 13, Code Revisions 1 Stars 11 Forks 8. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below.

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