private void ThreadLoop()
{
// make the RegOpenKeyEx call
IntPtr registryKey;
int result = RegOpenKeyEx(registryHive,
registrySubName,
0,
STANDARD_RIGHTS_READ | KEY_QUERY_VALUE | KEY_NOTIFY,
out registryKey);
if(result != 0)
{
throw new Win32Exception(result);
}
try
{
AutoResetEvent eventNotify = new AutoResetEvent(false);
// set up the events that we act on
WaitHandle[] waitHandles = new WaitHandle[] { eventNotify, eventTerminate };
while(!eventTerminate.WaitOne(0, true))
{
// make the RegNotifyChangeKeyValue call to monitor the key
result = RegNotifyChangeKeyValue(registryKey,
true,
regFilter,
eventNotify.SafeWaitHandle,
true);
if(result != 0)
{
throw new Win32Exception(result);
}
// the signal we waited on was an eventNotify
if(WaitHandle.WaitAny(waitHandles) == 0)
{
// create a RegistryKey object using the handle we got earlier
RegistryKey changedRegKey = RegistryKey.FromHandle(new SafeRegistryHandle(registryKey, true));
// send this RegistryKey object back to the event handler
OnRegChangedEventArgs args = new OnRegChangedEventArgs();
// for our purposes, the time the key changed was now
args.timeChanged = DateTime.Now;
args.changedKey = changedRegKey;
// call the handler and signal the event
OnRegChanged(args);
eventNotify.Set();
}
}
}
finally
{
// close the key
if(registryKey != IntPtr.Zero)
{
RegCloseKey(registryKey);
}
}
}
/// <summary>
/// Event handler for registry changes. Extracts the value of AccentPalette and passes it along
/// </summary>
/// <param name="e">OnRegChangedEvents object that contains the changed registry key</param>
private void onRegistryChange(object sender, OnRegChangedEventArgs e)
{
// get the value from the RegistryKey object
setColor((byte[])e.changedKey.GetValue(accentPalette));
}
/// <summary>
/// Raises a <see cref="RegChanged"/> event
/// </summary>
/// <remarks>
/// <para>
/// <b>OnRegChanged</b> is called when the registry key changes
/// </para>
/// </remarks>
/// <param name="e">object containing details of the raised event (registry changes)</param>
protected virtual void OnRegChanged(OnRegChangedEventArgs e)
{
EventHandler<OnRegChangedEventArgs> handler = RegChanged;
if(handler != null)
{
handler(this, e);
}
}
