Jan 05

Battery Status on Windows Mobile

3 Comment(s)

    大家知道，我们可以通过Start->Settings->Systems->Power来查看系统的电池情况，包括电池的类型，剩余的电量等等，如下图1所示：

图1：Windows Mobile自带的Power查看界面

    但是如果再细化到电压、温度、电流等情况的话，我们只有自己来实现了。查阅了MSDN之后发现，托管的SystemState类中，关于Power的成员如下表1所示，并没有细化到电池的电压、温度、电流情况，只有主电池、备用电池的电量高低。

表1 SystemState类中Power有关的成员

PowerBatteryBackupState

Gets the current backup battery state (for example, it is low, and charging). This enumeration allows a bitwise combination of its member values.

PowerBatteryBackupStrength

Gets the remaining backup battery power level, expressed as a percentage offully charged.

PowerBatteryState

Gets the current battery state (for example, it is low, and charging). This enumeration allows a bitwise combination of its member values.

PowerBatteryStrength

Gets the remaining battery power level, expressed as a percentage offully charged.

    而Native方法中有一个GetSystemPowerStatusEx2，返回SYSTEM_POWER_STATUS_EX2结构体。其包含的字段如下：

 BYTE ACLineStatus;

 BYTE BatteryFlag;

 BYTE BatteryLifePercent;

 BYTE Reserved1;

 DWORD BatteryLifeTime;

 DWORD BatteryFullLifeTime;

 BYTE Reserved2;

 BYTE BackupBatteryFlag;

 BYTE BackupBatteryLifePercent;

 BYTE Reserved3;

 DWORD BackupBatteryLifeTime;

 DWORD BackupBatteryFullLifeTime;

 DWORD BatteryVoltage;

 DWORD BatteryCurrent;

 DWORD BatteryAverageCurrent;

 DWORD BatteryAverageInterval;

 DWORD BatterymAHourConsumed;

 DWORD BatteryTemperature;

 DWORD BackupBatteryVoltage;

 BYTE BatteryChemistry;

    在该结构体中，包括我们所需的电池电压、温度、电流情况。那么，如何来实现呢？Joel Ivory Johnson在Windows Mobile Power Management中给出了实现方法。

    首先，我们将所需要的Native Method通过Platform invoke的方式引入到我们的工程中，

       [DllImport("CoreDLL")]

       public static extern int GetSystemPowerStatusEx2(

            SYSTEM_POWER_STATUS_EX2 statusInfo,

           int length,

           int getLatest

               );

       public static SYSTEM_POWER_STATUS_EX2 GetSystemPowerStatus()

       {

           SYSTEM_POWER_STATUS_EX2 retVal = new SYSTEM_POWER_STATUS_EX2();

          int result = GetSystemPowerStatusEx2( retVal, Marshal.SizeOf(retVal) , 1);

           return retVal;

       }

    然后在我们的应用逻辑中，加入GetSystemPowerStatus()函数，并且将结果显示在界面上。程序运行效果如下图2所示：

图2：程序运行效果

    我们可以改变模拟器的电池状态来看看程序的运行情况，如下图3所示，改变Emulator Properties中的Battery：

图3：改变Emulator Properties中的Battery

    再看程序的运行界面如下图4所示：

图4：改变Battery后的程序界面

    可以看到，电池的剩余电量部分发生了改变，与我们设置的值相等。不过，由于我使用的是模拟器，所以电压、电流等显示有问题，回头我在Device上试试看。

    源代码工程在此下载：BatteryStatus.rar  环境: Visual Studio 2008+Windows mobile 6.0 professional SDK

 

参考文章：Windows Mobile Power Management

3 Comments so far

  1. Good afternoon. Before you do anything, think. If you do something to try and impress someone, to be loved, accepted or even to get someone's attention, stop and think. So many people are busy trying to create an image, they die in the process.

    I am from Macedonia and know bad English, tell me right I wrote the following sentence: "If the lamisil caused this, how long would you guess it would take to wear off."



    Regards :o Sibyl.
    Sibyl wrote on 六月 2009 09:05:31
  2. Give please. The only way to get rid of a temptation is to yield to it.

    I am from Angola and learning to write in English, give please true I wrote the following sentence: "Of cat flea control and tick control products, including advantage, frontline, sentry natural defense natural flea and tick for cats and kittens."



    Thank you very much :-D. Willard.
    Willard wrote on Jul 2009 07:46:09
  3. xpvKFXWv
    xpvKFXWv wrote on 七月 2010 06:44:18

leave a reply

All fields marked with " * " are required.