C#：获取设备电量相关信息

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  [DllImport("kernel32.dll",EntryPoint="GetSystemPowerStatus")]   //win32 api
        private static extern void GetSystemPowerStatus(ref SYSTEM_POWER_STATUS lpSystemPowerStatus);   

         public struct SYSTEM_POWER_STATUS    //结构体
         {
             public Byte ACLineStatus;                //0 = offline, 1 = Online, 255 = UnKnown Status.
             public Byte BatteryFlag;
            public Byte BatteryLifePercent;
            public Byte Reserved1;
            public int BatteryLifeTime;
             public int BatteryFullLifeTime;
         }  

        /// <summary>
        ///  获取系统电量百分比
        /// </summary>
        /// <returns></returns>
        public static float GetSystemPower()
        {
            SYSTEM_POWER_STATUS SysPower = new SYSTEM_POWER_STATUS();
            GetSystemPowerStatus(ref SysPower);

            return SysPower.BatteryLifePercent;
        }