RE: [GD-Windows] DDE Event not showing up

[Jon W. <hp...@mi...>]

Thanks. The following MSDN article talks about the Mutex approach.

http://support.microsoft.com/support/kb/articles/Q243/9/53.ASP

Note that if the mutex already exists, you don't get back some convenient
handle to the other instance; this specific technique is only useful to
determine _whether_ another instance is running.


It seems weird if DDE is fundamentally broken; it's used by a lot of apps
and has been around forever... but that doesn't mean much these days :-/

Cheers,

			/ h+


> -----Original Message-----
> From: gam...@li...
> [mailto:gam...@li...]On Behalf Of
> Aaron Hilton
> Sent: Sunday, October 07, 2001 4:42 AM
> To: GDWindows
> Subject: Re: [GD-Windows] DDE Event not showing up
>
>
> Oops.. darn reply-to crap.
> Here's my proper message.
> ----
> For the case of not using a DDE I understand a mutex is used. I'm not
> entirely sure of the details, but essentially if a mutex (semaphore) is
> already locked, then you get what application locked the mutex (the
> other instance) and send that app the activation message then close.
>
> It's a quick 10-15 lines of code.  I've seen it used a long while back,
> so I'm fuzzy on how it all works.
>
> The benefit, You guarantee the app refuses to launch twice, unless
> specifically requested. And it appears to be the official way MS deals
> with the double-launch problem too.  Could one of the MS experts help
> elaborate?  I would really like to refresh here too.
>
> I don't trust the DDE implementation because of some flaky problems I've
> had writing remote control stuff for WinAmp's DDE interface.  Yuck.. I
> think DDE is either broken on some versions of windows, therefore
> undependable and useless, or maybe I was struck with WinAmp misbehaving
> on certain platforms.
>
> Good luck...
> - Aaron.
>
> Jon Watte wrote:
> >
> > This has puzzled me and some other fellows for a while; I hope
> some of you
> > smart people know the answer!
> >
> > In an app we're working on, a regular Windows app is started
> from a web page
> > by registering a MIME type to IE, which starts the app, and having the
> > browser send DDE data to the application.
> >
> > However, sometimes when the app gets started from the link, it
> takes about
> > 30-60 seconds until the DDE data arrives. However, if I click
> the window,
> > the data will arrive immediately. This is a major drag, as the
> application
> > will just sit idle and dull until the data arrives.
> >
> > I'd prefer to stay with DDE because it handles the case of
> clicking a link
> > while the app is already open. However, if you can think of
> some other way
> > of accomplishing something similar, including some kind of gross hack,
> > that'd be swell too, as this is only an in-house tool kind of thing.
> >
> > Cheers,
> >
> >                                 / h+
> >
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