[Interest] single application

[Duane]

On 4/8/2013 12:37 PM, Nils Jeisecke wrote:
> Hi Duane,
>
>> To prevent multiple instances, we are using QSingleApplication.  On Windows, if the
>> app is started from the desktop this works fine but if it's started from
>> a console a second instance can be started.
> please try to apply the patch from
> https://codereview.qt-project.org/#change,44118 and report if this
> solves your problem.

I've made a new build of the library for windows with your patch and it 
seems to work as expected.  I revert to the old library and the behavior 
reappears.  It looks to me that this is fixed.

I haven't tried this on Linux yet but will do so shortly.  I don't seem 
to have this problem on Linux though.

One issue on both Linux and windows is with multiple users.  Based on 
the comments in the code it seems that isRunning() is not guaranteed to 
work between users.  Does this imply that sendMessage() does?  I've not 
investigated this version closely but I believe that older versions used 
the same code from isRunning() in the beginning of the sendMessage() 
function.  And certainly with the current version that I have on Linux 
when run as a different user, both methods allow the second user access.