[C#]使用GetSystemPowerStatus API查看目前電源使用狀態

  <td valign="top" width="499">表示目前充電狀態。 
    <br />1為High(66%以上電力)、2為Low(33%以上電力)、4為Critical(5%以下電力)、8為Charging、128為NoBattery、255為UnKnow</td>
</tr>

<tr>
  <td valign="top" width="200">BatteryFullLifeTime</td>

  <td valign="top" width="499">表示充滿電力可使用多久時間(-1為不詳)。</td>
</tr>

<tr>
  <td valign="top" width="200">BatteryLifePercent</td>

  <td valign="top" width="499">表示電力剩餘多少百分比，其正常值為0~100，255為電力不詳。</td>
</tr>

<tr>
  <td valign="top" width="200">BatteryLifeTime</td>

  <td valign="top" width="499">表示剩餘電力可使用多久時間(-1為不詳)。</td>
</tr>

<tr>
  <td valign="top" width="200">ACLineStatus</td>

  <td valign="top" width="499">表示電源狀態。 
    <br />0為offline、1為online、255為unknow。</td>
</tr>

namespace Battery { [Flags] public enum BatteryChargeStatus : byte { High = 1, Low = 2, Critical = 4, Charging = 8, NoSystemBattery = 128, Unknown = 255 }

public enum PowerLineStatus : byte
{
    Offline = 0,
    Online = 1,
    Unknown = 255
}

class PowerStatus
{
    [DllImport("kernel32", EntryPoint = "GetSystemPowerStatus")]
    private static extern void GetSystemPowerStatus(ref SystemPowerStatus powerStatus);
    
    private struct SystemPowerStatus
    {
        public PowerLineStatus PowerLineStatus;
        public BatteryChargeStatus BatteryChargeStatus;
        public Byte BatteryLifePercent;
        public Byte Reserved;
        public int BatteryLifeRemaining;
        public int BatteryFullLifeTime;
    }

    private SystemPowerStatus _powerStatus;

    public PowerLineStatus PowerLineStatus
    {
        get
        {
            return _powerStatus.PowerLineStatus;
        }
    }

    public BatteryChargeStatus BatteryChargeStatus
    {
        get
        {
            return _powerStatus.BatteryChargeStatus;
        }
    }

    public float BatteryLifePercent
    {
        get
        {
            return _powerStatus.BatteryLifePercent;
        }
    }

    public int BatteryLifeRemaining
    {
        get
        {
            return _powerStatus.BatteryLifeRemaining;
        }
    }

    public int BatteryFullLifeTime
    {
        get
        {
            return _powerStatus.BatteryFullLifeTime;
        }
    }

    public PowerStatus()
    {
        UpdatePowerInfo();
    }


    public void UpdatePowerInfo()
    {
        GetSystemPowerStatus(ref _powerStatus);
    }
}

}

namespace BatteryPower { public partial class Form1 : Form {

    public Form1()
    {
        InitializeComponent();
    }

    private void UpdateInfo()
    {
        Battery.PowerStatus power = new Battery.PowerStatus();
        this.tbxPowerStatus.Text = power.PowerLineStatus.ToString();
        this.tbxBatteryChargeStatus.Text = power.BatteryChargeStatus.ToString();
        this.tbxBatteryFullLifetime.Text = power.BatteryFullLifeTime.ToString();
        this.tbxBatteryLifePercent.Text = power.BatteryLifePercent.ToString();
        this.tbxBatteryLifeRemaining.Text = power.BatteryLifeRemaining.ToString();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        UpdateInfo();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        UpdateInfo();
    }
}

}

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