Battery Status on Windows Mobile-优快云博客

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 of fully 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 of fully 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：

Code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--&gt  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，

Code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--&gt    [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：