如何以编程方式确定Motorola MC55 MC65 MC67位于支架中

问题描述：

我们需要能够确定在手持设备上运行的应用程序中设备是否已返回至支架。如何以编程方式确定Motorola MC55 MC65 MC67位于支架中

虽然一种方法可能是观察电池电量是否增加，但这种方法实际上是一种解决方法，并且如果电池电量为100％时会失败。

我们没有成功搜索到EMD帮助文件。

答

该方法我采取是P /调用和检查装置的电源状态，所以我创建了一个名为电源状态，类：

public enum ACLineStatus { Offline = 0, Online = 1, Unknown = 255 } 
[Flags] 
public enum BatteryStatus { High = 1, Low = 2, Critical = 4, Charging = 8, NoSystemBattery = 128, Unknown =-1 } 

public class PowerStatus 
{ 
    private struct _SYSTEM_POWER_STATUS_EX 
    { 
     public byte ACLineStatus; 
     public byte BatteryFlag; 
     public byte BatteryLifePercent; 
     public byte Reserved1; 
     public uint BatteryLifeTime; 
     public uint BatteryFullLifeTime; 
     public byte Reserved2; 
     public byte BackupBatteryFlag; 
     public byte BackupBatteryLifePercent; 
     public byte Reserved3; 
     public uint BackupBatteryLifeTime; 
     public uint BackupBatteryFullLifeTime; 
    } 

    [DllImport("coredll")] 
    private static extern uint GetSystemPowerStatusEx(ref _SYSTEM_POWER_STATUS_EX lpSystemPowerStatus, 
     bool fUpdate); 

    public ACLineStatus ACLineStatus { get; set; } 
    public BatteryStatus BatteryStatus { get; set; } 
    public byte? BatteryLifePercent { get; set; } 
    public TimeSpan? BatteryLifeTime { get; set; } 
    public TimeSpan? BatteryFullLifeTime { get; set; } 
    public BatteryStatus BackupBatteryStatus { get; set; } 
    public byte? BackupBatteryLifePercent { get; set; } 
    public TimeSpan? BackupBatteryLifeTime { get; set; } 
    public TimeSpan? BackupBatteryFullLifeTime { get; set; } 

    private PowerStatus() 
    { 

    } 

    public static PowerStatus GetCurrent() 
    { 
     _SYSTEM_POWER_STATUS_EX powerStatus = new _SYSTEM_POWER_STATUS_EX(); 
     GetSystemPowerStatusEx(ref powerStatus, true); 

     return new PowerStatus 
     { 
      ACLineStatus = (ACLineStatus)powerStatus.ACLineStatus, 
      BatteryStatus = (BatteryStatus)powerStatus.BatteryFlag, 
      BatteryLifePercent = powerStatus.BatteryLifePercent.Between((byte)0, (byte)100) ? (byte?)powerStatus.BatteryLifePercent : null, 
      BatteryLifeTime = powerStatus.BatteryLifeTime >= 0 ? new TimeSpan(0, 0, (int)powerStatus.BatteryLifeTime) as TimeSpan? : null, 
      BatteryFullLifeTime = powerStatus.BatteryFullLifeTime >= 0 ? new TimeSpan(0, 0, (int)powerStatus.BatteryFullLifeTime) as TimeSpan? : null, 
      BackupBatteryStatus = (BatteryStatus)powerStatus.BackupBatteryFlag, 
      BackupBatteryLifePercent = powerStatus.BackupBatteryLifePercent.Between((byte)0, (byte)100) ? (byte?)powerStatus.BackupBatteryLifePercent : null, 
      BackupBatteryLifeTime = powerStatus.BackupBatteryLifeTime >= 0 ? new TimeSpan(0, 0, (int)powerStatus.BackupBatteryLifeTime) as TimeSpan? : null, 
      BackupBatteryFullLifeTime = powerStatus.BackupBatteryFullLifeTime >= 0 ? new TimeSpan(0, 0, (int)powerStatus.BackupBatteryFullLifeTime) as TimeSpan? : null 
     }; 
    } 
}

，然后在我的“设备”类我有一个计时器，其火灾时，该设备是停靠

public static event EventHandler DeviceDocked; 

    private static ACLineStatus _lastPowerState = PowerStatus.GetCurrent().ACLineStatus; 
    private static void timer_Tick(object state) 
    { 
     ACLineStatus powerState = PowerStatus.GetCurrent().ACLineStatus; 
     _timer.Change(Timeout.Infinite, Timeout.Infinite); 
     if (powerState == ACLineStatus.Online && _lastPowerState == ACLineStatus.Offline) 
     { 
      var e = DeviceDocked; 
      if (e != null) 
      { 
       e(null, EventArgs.Empty); 
      } 
     } 
     _lastPowerState = powerState; 
     _timer.Change(1000, Timeout.Infinite); 
    }

这PowerStatus.GetCurrent（）可能是你需要一个事件。我希望这有助于:)

如何以编程方式确定Motorola MC55 MC65 MC67位于支架中

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