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

[Aaron H. <Vid...@ho...>]

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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