使用C#在Windows Mobile设备上获取设备电量信息

通过调用Windows Mobile API获取设备电量信息，可以在程序中实时监测、显示设备电量，方便用户及时了解设备电量，避免设备意外关闭导致数据丢失。

using Microsoft.WindowsCE.Forms;
using System.Reflection;
using System.Runtime.InteropServices; 

namespace TestBattery
{
    public partial class Form1 : Form
    {
        [DllImport("coredll.dll")]
        private static extern int GetSystemPowerStatusEx2(SYSTEM_POWER_STATUS_EX2 lpSystemPowerStatusEx2, int dwLen, bool fUpdate);

        private struct SYSTEM_POWER_STATUS_EX2
        {
            public Byte ACLineStatus;
            public Byte BatteryFlag;
            public Byte BatteryLifePercent;
            public Byte Reserved1;
            public int BatteryLifeTime;
            public int BatteryFullLifeTime;
            public Byte Reserved2;
            public Byte BackupBatteryFlag;
            public Byte BackupBatteryLifePercent;
            public Byte Reserved3;
            public int BackupBatteryLifeTime;
            public int BackupBatteryFullLifeTime;
        }

        public Form1()
        {
            InitializeComponent();
            SystemEvents.PowerModeChanged += new PowerModeChangedEventHandler(SystemEvents_PowerModeChanged);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            SYSTEM_POWER_STATUS_EX2 SystemPowerStatusEx2 = new SYSTEM_POWER_STATUS_EX2();
            int nRet = GetSystemPowerStatusEx2(SystemPowerStatusEx2, Marshal.SizeOf(SystemPowerStatusEx2), true);
            if (nRet > 0 && SystemPowerStatusEx2.BatteryLifePercent != 255)
            {
                lblBattery.Text = "当前电量：" + SystemPowerStatusEx2.BatteryLifePercent.ToString() + "%";
            }
        }

        private void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e)
        {
            SYSTEM_POWER_STATUS_EX2 SystemPowerStatusEx2 = new SYSTEM_POWER_STATUS_EX2();
            int nRet = GetSystemPowerStatusEx2(SystemPowerStatusEx2, Marshal.SizeOf(SystemPowerStatusEx2), true);
            if (nRet > 0 && SystemPowerStatusEx2.BatteryLifePercent != 255)
            {
                lblBattery.Text = "当前电量：" + SystemPowerStatusEx2.BatteryLifePercent.ToString() + "%";
            }
        }
    }
}

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