Re: Inter-Application Communication in Cocoa ?
Re: Inter-Application Communication in Cocoa ?
- Subject: Re: Inter-Application Communication in Cocoa ?
- From: Douglas Davidson <email@hidden>
- Date: Fri, 13 Sep 2002 13:54:36 -0700
On Friday, September 13, 2002, at 12:58 PM, Paul Collins wrote:
On Thursday, September 12, 2002, at 10:24 AM, Douglas Davidson wrote:
> For broadcast local-machine communications, the natural choice would
> be distributed notifications.
This is what I thought, until I tried distributed notifications
(NSDistributedNotificationCenter) yesterday (on 10.2 6C115) and found
a couple of bugs, which I reported, and also found in the list
archives. Are these really bugs, or did I do something wrong?
1. The "object" field (NSString *) is never delivered, it is <nil>
upon reciept. (possibly the dictionary object could be used as a
workaround).
That seems odd--do you have an example?
2. Processes launched before user login (such as StartupItems daemons)
cannot receive (or send?) distributed notifications. (maybe not a bug,
but needs to be documented)
Probably should be documented.
3. It was reported on this list earlier that apps launched as Login
Items also had trouble using distributed notifications (I didn't
confirm this).
I haven't seen any bugs about that, but it is conceivable there might
be a race condition if a notification were sent immediately after login.
As my notification needs are quite simple, for IPC I'm setting up a
couple of named pipes (FIFOs) for private notices between my daemon
and user AppKit app. Distirbuted Objects might be easier, if they
work, but I've done FIFOs before. These are documented in the book
Advanced Programming in the UNIX Environment by Stevens, and Practical
Unix Programming by Robbins.
Certainly the BSD-level mechanisms are available, if you are more
familiar with them.
Douglas Davidson
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