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RegNotifyChangeKeyValue (advapi32)
.
C# Signature:
[DllImport("advapi32.dll", SetLastError=true)]
static extern int RegNotifyChangeKeyValue(IntPtr hKey, bool watchSubtree,
int dwNotifyFilter, IntPtr hEvent, bool fAsynchronous);
VB Signature:
Declare Function RegNotifyChangeKeyValue Lib "advapi32.dll" (hKey As IntPtr, _
watchSubtree As Boolean, dwNotifyFilter As Integer, hEvent As IntPtr,
fAsynchronous As Boolean) As Integer
Notes:
Starting with the .NET Framework 2.0, the IntPtr parameters could be defined as SafeHandle instead.
[Flags]
public enum REG_NOTIFY_CHANGE : uint
{
/// <summary>
/// Notify the caller if a subkey is added or deleted
/// </summary>
NAME = 0x1,
/// <summary>
/// Notify the caller of changes to the attributes of the key,
/// such as the security descriptor information
/// </summary>
ATTRIBUTES = 0x2,
/// <summary>
/// Notify the caller of changes to a value of the key. This can
/// include adding or deleting a value, or changing an existing value
/// </summary>
LAST_SET = 0x4,
/// <summary>
/// Notify the caller of changes to the security descriptor of the key
/// </summary>
SECURITY = 0x8
}
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Threading;
using Microsoft.Win32;
this.Stop();
}
public void Dispose()
{
this.Dispose(true);
}
public void Start()
{
lock (this)
{
if (this._monitorThread == null)
{
ThreadStart ts = new ThreadStart(this.MonitorThread);
this._monitorThread = new Thread(ts);
this._monitorThread.IsBackground = true;
}
#region Enumerations
[Flags]
public enum REG_NOTIFY_CHANGE : uint
{
NAME = 0x1,
ATTRIBUTES = 0x2,
LAST_SET = 0x4,
SECURITY = 0x8
// The "Close()" will trigger RegNotifyChangeKeyValue if it is still listening
if (this._monitorKey != null)
{
this._monitorKey.Close();
this._monitorKey = null;
}
}
}
#endregion
if (ptr != IntPtr.Zero)
{
while (true)
{
// If this._monitorThread is null that probably means Dispose is being called. Don't monitor anymore.
if ((this._monitorThread == null) || (this._monitorKey == null))
break;
// RegNotifyChangeKeyValue blocks until a change occurs.
int result = RegNotifyChangeKeyValue(ptr, true, this._filter, IntPtr.Zero, false);
if ((this._monitorThread == null) || (this._monitorKey == null))
break;
if (result == 0)
{
if (this.Changed != null)
{
RegistryChangeEventArgs e = new RegistryChangeEventArgs(this);
this.Changed(this, e);
if (e.Stop) break;
}
}
else
{
if (this.Error != null)
{
Win32Exception ex = new Win32Exception();
// Unless the exception is thrown, nobody is nice enough to set a good stacktrace for us. Set it ourselves.
typeof(Exception).InvokeMember(
"_stackTrace",
BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.SetField,
null,
ex,
new object[] { new StackTrace(true) }
);
RegistryChangeEventArgs e = new RegistryChangeEventArgs(this);
e.Exception = ex;
this.Error(this, e);
}
this.Changed(this, e);
break;
if (e.Stop) break;
}
}
}
}
}
catch (Exception ex)
{
if (this.Error != null)
{
RegistryChangeEventArgs e = new RegistryChangeEventArgs(this);
e.Exception = ex;
this.Error(this, e);
}
}
finally
{
this.Stop();
}
}
#endregion
else
{
if (this.Error != null)
{
Win32Exception ex = new Win32Exception();
#region Events
public event RegistryChangeHandler Changed;
public event RegistryChangeHandler Error;
#endregion
// Unless the exception is thrown, nobody is nice enough to set a good stacktrace for us. Set it ourselves.
typeof(Exception).InvokeMember(
"_stackTrace",
BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.SetField,
null,
ex,
new object[] { new StackTrace(true) }
);
#region Properties
public bool Monitoring
{
get
{
if (this._monitorThread != null)
return this._monitorThread.IsAlive;
RegistryChangeEventArgs e = new RegistryChangeEventArgs(this);
e.Exception = ex;
this.Error(this, e);
}
#region Properties
public RegistryChangeMonitor Monitor
public bool Monitoring
{
get { return this._monitor; }
}
get
{
if (this._monitorThread != null)
return this._monitorThread.IsAlive;
public Exception Exception
{
get { return this._exception; }
set { this._exception = value; }
return false;
}
}
public bool Stop
{
get { return this._stop; }
set { this._stop = value; }
}
#endregion
}
}
#region Properties
public RegistryChangeMonitor Monitor
{
get { return this._monitor; }
}
public Exception Exception
{
get { return this._exception; }
set { this._exception = value; }
}
public bool Stop
{
get { return this._stop; }
set { this._stop = value; }
}
#endregion
}
}
Alternative Managed API:
Do you know one? Please contribute it!
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
TODO - a short description
5/10/2012 11:22:02 AM - anonymous
Please edit this page!
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