Try using the BatteryStatus
WMI class instead.
Try this sample.
using System;
using System.Collections.Generic;
using System.Management;
using System.Text;
namespace GetWMI_Info
{
public class EventWatcherAsync
{
private void WmiEventHandler(object sender, EventArrivedEventArgs e)
{
Console.WriteLine("TargetInstance.Charging : " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Charging"]);
Console.WriteLine("TargetInstance.Description : " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Description"]);
Console.WriteLine("TargetInstance.Name : " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Name"]);
Console.WriteLine("TargetInstance.PowerOnline : " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["PowerOnline"]);
Console.WriteLine("TargetInstance.RemainingCapacity : " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["RemainingCapacity"]);
Console.WriteLine("TargetInstance.Voltage : " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Voltage"]);
}
public EventWatcherAsync()
{
try
{
string ComputerName = "localhost";
string WmiQuery;
ManagementEventWatcher Watcher;
ManagementScope Scope;
if (!ComputerName.Equals("localhost", StringComparison.OrdinalIgnoreCase))
{
ConnectionOptions Conn = new ConnectionOptions();
Conn.Username = "";
Conn.Password = "";
Conn.Authority = "ntlmdomain:DOMAIN";
Scope = new ManagementScope(String.Format("\\\\{0}\\root\\WMI", ComputerName), Conn);
}
else
Scope = new ManagementScope(String.Format("\\\\{0}\\root\\WMI", ComputerName), null);
Scope.Connect();
WmiQuery ="Select * From __InstanceModificationEvent Within 1 "+
"Where TargetInstance ISA 'BatteryStatus' ";
Watcher = new ManagementEventWatcher(Scope, new EventQuery(WmiQuery));
Watcher.EventArrived += new EventArrivedEventHandler(this.WmiEventHandler);
Watcher.Start();
Console.Read();
Watcher.Stop();
}
catch (Exception e)
{
Console.WriteLine("Exception {0} Trace {1}", e.Message, e.StackTrace);
}
}
public static void Main(string[] args)
{
Console.WriteLine("Listening {0}", "__InstanceModificationEvent");
Console.WriteLine("Press Enter to exit");
EventWatcherAsync eventWatcher = new EventWatcherAsync();
Console.Read();
}
}
}