IpcChannel will not create

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quilkin - 20 Dec 2007 09:52 GMT

Hi,
I have a Windows service which communicates to a user app via IpcChannel
remoting.
It all works fine until the service is stopped and restarted (or restarted
via Management Console Services), when the lines
_ipc = new IpcChannel(properties, clientProv, serverProv);
ChannelServices.RegisterChannel(_ipc, true);
fail because _ipc returns 'null'.
I did try have a statement
ChannelServices.UnregisterChannel(_ipc);
when the service stops but that made no difference.
If I wait several minutes before restarting the service, it usually restarts
OK, but I need it to restart in less than one minute if there's a problem
with it. Note, it always restarts OK on Vista, this problem is only evident
on XP!!

So, how do ensure that the previous incarnation of the remoting channel is
always deleted?

Reply to this Message

Nicholas Paldino [.NET/C# MVP] - 20 Dec 2007 15:55 GMT

Well, this kind of indicates that you are not keeping track of the
channel in your service like you should. There should only be some very
limited places where you would need to create/destroy the channel, are you
sure you are doing it in the appropriate places?

Signature

- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

> Hi,
> I have a Windows service which communicates to a user app via IpcChannel
[quoted text clipped - 17 lines]
> So, how do ensure that the previous incarnation of the remoting channel is
> always deleted?

Reply to this Message

quilkin - 20 Dec 2007 17:03 GMT

Nicholas,

The channel is created once, and once only, in the 'OnStart()' method of the
service. _ipc is currently a class property but we have also tried it as a
local in the constructor so it should have got destroyed there.
Can't use the 'using' statement because IpcChannel is not 'disposable'.
Presumably something in XP is doing a cleanup several minutes after the
service closes. But in Vista it's cleaned straight away. is this a clue?

> Well, this kind of indicates that you are not keeping track of the
> channel in your service like you should. There should only be some very
[quoted text clipped - 22 lines]
> > So, how do ensure that the previous incarnation of the remoting channel is
> > always deleted?

Reply to this Message

IpcChannel will not create

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