Clearing the AppBar after the process is complete

Question

I wrote the Desktop application toolbar (aka AppBar), it works fine, except for the fact that if I kill this process, the AppBar code will never get the ability to clear by sending ABM_REMOVE. The problem is that it basically twists the users desktop. AppBar is written in .NET using interop code.

Does anyone know how to clear this resource, even if the process is deleted from the TaskManager?

Answer 1

When a process is killed from the task manager, events are not raised in this application. Usually a separate helper application is used that listens for the Win32_ProcessStopTrace event for your process. You can use WqlEventQuery, which is part of System.Management for this.

Here is a sample code for this from the MegaSolutions post .

using System; using System.Collections.Generic; using System.Text; using System.Management; class ProcessObserver : IDisposable { ManagementEventWatcher m_processStartEvent = null; ManagementEventWatcher m_processStopEvent = null; public ProcessObserver(string processName, EventArrivedEventHandler onStart, EventArrivedEventHandler onStop) { WqlEventQuery startQuery = new WqlEventQuery("Win32_ProcessStartTrace", String.Format("ProcessName='{0}'", processName)); m_processStartEvent = new ManagementEventWatcher(startQuery); WqlEventQuery stopQuery = new WqlEventQuery("Win32_ProcessStopTrace", String.Format("ProcessName='{0}'", processName)); m_processStopEvent = new ManagementEventWatcher(stopQuery); if (onStart != null) m_processStartEvent.EventArrived += onStart; if (onStop != null) m_processStopEvent.EventArrived += onStop; } public void Start() { m_processStartEvent.Start(); m_processStopEvent.Start(); } public void Dispose() { m_processStartEvent.Dispose(); m_processStopEvent.Dispose(); } }