More than 1 year has passed since last update.

[C#/WPF] ノートPCのバッテリーの充電状況などを取得する

Last updated at 2022-02-06Posted at 2020-11-12

やりたいこと

C#アプリの中で、バッテリの充電が今どれくらいなのか？を知りたい。

やり方

WinFormのAPIを使うやり方と、UWPのAPIを使うやり方があるっぽい。

UWPのAPI版

Windows.Devices.Power 名前空間のクラスを使う。
WPFで使うには、下記の手順が必要。

UWPのAPIを使えるように参照を追加(こちら参照)
using Windows.Devices.Power;を追加

UWP版.cs

using System;
using Windows.Devices.Power;
using System.Threading;

// C:\Program Files (x86)\Windows Kits\10\UnionMetadata\Windows.winmd を参照に追加必要
namespace ConsoleApp49
{
    class Program
    {
        static Battery AggBattery = Battery.AggregateBattery;

        static void Main(string[] args)
        {
            // 変化したときに読んでもらう
            AggBattery.ReportUpdated += AggBattery_ReportUpdated;
            // 定期的にも表示する
            var timer = new Timer(((param) => { AggBattery_ReportUpdated(null, null); }), null, 0, 1000);

            Console.ReadLine();
        }

        private static void AggBattery_ReportUpdated(Battery sender, object args)
        {
            var report = Battery.AggregateBattery.GetReport();

            var Maximum = Convert.ToDouble(report.FullChargeCapacityInMilliwattHours);
            var Value = Convert.ToDouble(report.RemainingCapacityInMilliwattHours);
            var Percent = (Value / Maximum) * 100;

            var ValToFull = Maximum - Value;
            var TimeToFull = (ValToFull / report.ChargeRateInMilliwatts) * 60.0;
            var TimeToEmpty = (Value / report.ChargeRateInMilliwatts) * 60.0;

            if (sender != null)
                Console.Write("*");// 変化検出時に呼ばれた場合は*つける

            Console.Write("St:" + report.Status + " Charge:" + Percent.ToString("F2") + "% Charge Rate:" + report.ChargeRateInMilliwatts);
            Console.Write(" DesignCapacityInMilliwattHours:" + report.DesignCapacityInMilliwattHours + " FullChargeCapacityInMilliwattHours = " + report.FullChargeCapacityInMilliwattHours + "  RemainingCapacityInMilliwattHours:" + report.RemainingCapacityInMilliwattHours);

            if (report.ChargeRateInMilliwatts == 0)
            {
                // ChargeRateInMilliwattsが0ならACアダプタ挿抜直後等
                Console.WriteLine(" Calcurating...");
            }
            else if (report.ChargeRateInMilliwatts > 0)
            {
                // ChargeRateInMilliwattsが＋なら充電中(AC)
                Console.WriteLine(" TimeToFull = " + TimeToFull + " min");
            }
            else
            {
                // ChargeRateInMilliwattsが－なら放電中(SC)
                Console.WriteLine(" TimeToEmpty = " + (-TimeToEmpty) + " min");
            }

        }
    }
}

WinForm版

System.Windows.Forms名前空間のSystemInformation.PowerStatusを使う。

WinForm版.cs

        static void Main(string[] args)
        {
            while (true)
            {
                var chargeStatus = SystemInformation.PowerStatus.BatteryChargeStatus;
                var fullLifetime = SystemInformation.PowerStatus.BatteryFullLifetime;
                var percent = SystemInformation.PowerStatus.BatteryLifePercent;
                var lifeRemaining = SystemInformation.PowerStatus.BatteryLifeRemaining;
                var powerlineStatus = SystemInformation.PowerStatus.PowerLineStatus;

                Console.WriteLine("chargeStatus = " + chargeStatus + "  fullLifetime = " + fullLifetime + "  percent = " + percent + "  lifeRemaining = " + lifeRemaining + "  powerlineStatus = " + powerlineStatus);

                Thread.Sleep(1000);
            }
        }