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Re: Open existing instance of app from Emacs lisp?

From: B. T. Raven
Subject: Re: Open existing instance of app from Emacs lisp?
Date: Sat, 09 Aug 2008 07:42:53 -0500
User-agent: Thunderbird (Windows/20080708)

David Wolff wrote:
Hi all,

I used "w32-shell-execute" to open apps, documents, and folders in a
very nice little menu, eg:

     (w32-shell-execute "open" "C:/WINDOWS/System32/calc.exe")

Then I discovered that, for applications, this always opens a new
instance instead of switching to an existing copy.  Just what I need, 14
copies of Calculator running.  :-)

So okay, I can use w32-window-exists-p to see if the app is already
running.  Now is there a way to activate the app from lisp?

Thanks --


(Remove "xx" to reply.)

Apparently someone called XSteve (an Austrian??) has put together "sww.exe" and sww.el that will do what you want. Google on these. I wasn't able to try them because I am missing mfc71.dll and I don't know where to download it safely. If you have this dll you will probably be able to switch between windows apps from within Emacs. The closest I can get to what you want is:

(if (not (w32-window-exists-p nil "Calculator"))

  (w32-shell-execute "open" "C:/Winnt/System32/calc.exe"))

and then use Alt-Tab to bring up calculator.

By the way, the calc programs (simple and programmable) embedded within Emacs are far superior to the msw Calculator program.


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