Re: [gtkmm] prevent an application to running twice

[Joe Yandle <jwy divisionbyzero com>]

> Hi everyone,
> 

Hello.

> Can somebody tell me how I can prevent an application to have multiple 
> instance.
> 

There are many ways to do this.  A common way is to have the application 
write to a pid file, and store its process id.  That way, when the application
starts, it can check the pid file.  If the file exists, and there is a process
with the correct name running under that pid, then the application bails.

In gtkmail, I use a named pipe to handle this:

    http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/gtkmail/gtkmail/src/main.cc?rev=1.11&content-type=text/vnd.viewcvs-markup

This allows me to not only detect running instances, but also to pop up
a compose window in response to a mailto url.  If you have trouble understanding
the code, reply off list and I'll explain.

cheers,
--
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