通过winapi获取windows系统的电池剩余量

NewLife.Core/Common/MachineInfo.cs

@@ -11,6 +11,8 @@
 using NewLife.Serialization;
 using System.Runtime.Versioning;
 using System.Diagnostics.CodeAnalysis;
+using NewLife.Windows;
+
 #if NETFRAMEWORK
 using System.Management;
 using Microsoft.VisualBasic.Devices;
@@ -572,6 +574,8 @@ private void RefreshWindows()
 
         CpuRate = total == 0 ? 0 : (Single)Math.Round((Single)(total - idle) / total, 4);
 
+        var power = new PowerStatus();
+
 #if NETFRAMEWORK
         if (!_excludes.Contains(nameof(Temperature)))
         {
@@ -595,7 +599,9 @@ private void RefreshWindows()
             }
         }
 
-        if (!_excludes.Contains(nameof(Battery)))
+        if (power.BatteryLifePercent > 0)
+            Battery = power.BatteryLifePercent;
+        else if (!_excludes.Contains(nameof(Battery)))
         {
             // 电池剩余
             var str = GetInfo("Win32_Battery", "EstimatedChargeRemaining");
@@ -625,7 +631,9 @@ private void RefreshWindows()
             }
         }
 
-        if (!_excludes.Contains(nameof(Battery)))
+        if (power.BatteryLifePercent > 0)
+            Battery = power.BatteryLifePercent;
+        else if (!_excludes.Contains(nameof(Battery)))
         {
             var battery = ReadWmic("path win32_battery", "EstimatedChargeRemaining");
             if (battery != null && battery.Count > 0)

NewLife.Core/Windows/PowerStatus.cs

@@ -0,0 +1,109 @@
+using System.Runtime.InteropServices;
+
+namespace NewLife.Windows;
+
+/// <summary>系统电源状态</summary>
+public enum PowerLineStatus
+{
+    /// <summary>脱机状态</summary>
+    Offline = 0,
+    /// <summary>联机状态</summary>
+    Online = 1,
+    /// <summary>电源状态未知</summary>
+    Unknown = 255
+}
+
+/// <summary>充电状态信息</summary>
+[Flags]
+public enum BatteryChargeStatus
+{
+    /// <summary>指示电池能量级别较高</summary>
+    High = 1,
+    /// <summary>指示电池能量级别较低</summary>
+    Low = 2,
+    /// <summary>指示电池能量严重不足</summary>
+    Critical = 4,
+    /// <summary>指示电池正在充电</summary>
+    Charging = 8,
+    /// <summary>指示没有电池存在</summary>
+    NoSystemBattery = 0x80,
+    /// <summary>指示未知电池状态</summary>
+    Unknown = 0xFF
+}
+
+/// <summary>电源状态</summary>
+public class PowerStatus
+{
+    private SYSTEM_POWER_STATUS systemPowerStatus;
+
+    /// <summary>当前的系统电源状态</summary>
+    public PowerLineStatus PowerLineStatus
+    {
+        get
+        {
+            UpdateSystemPowerStatus();
+            return (PowerLineStatus)systemPowerStatus.ACLineStatus;
+        }
+    }
+
+    /// <summary>当前的电池电量状态</summary>
+    public BatteryChargeStatus BatteryChargeStatus
+    {
+        get
+        {
+            UpdateSystemPowerStatus();
+            return (BatteryChargeStatus)systemPowerStatus.BatteryFlag;
+        }
+    }
+
+    /// <summary>报告的主电池电源的完全充电寿命（以秒为单位）</summary>
+    public Int32 BatteryFullLifetime
+    {
+        get
+        {
+            UpdateSystemPowerStatus();
+            return systemPowerStatus.BatteryFullLifeTime;
+        }
+    }
+
+    /// <summary>电池剩余电量的近似量</summary>
+    public Single BatteryLifePercent
+    {
+        get
+        {
+            UpdateSystemPowerStatus();
+            var num = systemPowerStatus.BatteryLifePercent / 100f;
+            return num > 1f ? 1f : num;
+        }
+    }
+
+    /// <summary>电池的剩余使用时间的近似秒数</summary>
+    public Int32 BatteryLifeRemaining
+    {
+        get
+        {
+            UpdateSystemPowerStatus();
+            return systemPowerStatus.BatteryLifeTime;
+        }
+    }
+
+    private void UpdateSystemPowerStatus() => GetSystemPowerStatus(ref systemPowerStatus);
+
+    [DllImport("kernel32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
+    static extern Boolean GetSystemPowerStatus([In][Out] ref SYSTEM_POWER_STATUS systemPowerStatus);
+
+    struct SYSTEM_POWER_STATUS
+    {
+        public Byte ACLineStatus;
+
+        public Byte BatteryFlag;
+
+        public Byte BatteryLifePercent;
+
+        public Byte Reserved1;
+
+        public Int32 BatteryLifeTime;
+
+        public Int32 BatteryFullLifeTime;
+    }
+}