Re: Communication between applications

[Yen-Ju Chen]

 Thanx.
 I will use the NSDistributedNotificationCenter.
 I just wonder how expensive the NSDistributedNotificationCenter
 is in comparison to the NSNotificationCenter ?
 For example, about 10 notification per second and
 last about 3-5 seconds (when user drag the NSSlider).

 Yen-Ju

> From: Richard Frith-Macdonald <richard@brainstorm.co.uk>
> To: "Yen-Ju Chen" <yjchenx@hotmail.com>
> CC: help-gnustep@gnu.org
> Subject: Re: Communication between applications
> Date: Thu, 10 Oct 2002 06:20:56 +0100
>
>
> On Thursday, October 10, 2002, at 02:50  am, Yen-Ju Chen wrote:
>
> > Hi,
> >
> >  How could two applications communicate with each other ?
> >  It seems the NSNotification only work _WITHIN_ an application itself.
> >  Should I use DO to do that ?
> >  The situation is that I have two applications: MusicBox and Mixer.
> >  When I change something in MusicBox,
> >  I need to notify Mixer that something changed,
> >  and vice versa.
> >  NSNotification seems not to work in this situation.
>
> You have a few options - depending on how flexible the communication needs
> to be ...
>
> If the apps just need to send simple notifications with only string data,
> you can use an NSDistributedNotificationCenter.
>
> If the apps need to exchange information with a variety of well defined 
> types,
> you can set up an NSPasteboard to pass the data.
>
> If the apps need to actually send messages to each other and interoperate
> very closely, you need to use NSConnection (the other two mechanisms are
> implemented on top of NSConnection and using an intermediary server
> process ... so direct use of NSConnection is more work to code, but is
> more powerful and more efficient).




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