如何以編程方式確定Motorola MC55 MC65 MC67位於支架中

Question

我們需要能夠確定在手持設備上運行的應用程序中設備是否已返回至支架。

雖然一種方法可能是觀察電池電量是否增加，但這種方法實際上是一種解決方法，並且如果電池電量爲100％時會失敗。

我們沒有成功搜索到EMD幫助文件。

Answer 1

該方法我採取是P /調用和檢查裝置的電源狀態，所以我創建了一個名爲電源狀態，類：

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 
     }; 
    } 
} 

，然後在我的「設備」類我有一個計時器，其火災時，該設備是停靠

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); 
    } 

這PowerStatus.GetCurrent（）可能是你需要一個事件。我希望這有助於:)