Thank's for your replay.
Is there a very, very, very little example with Boost signal and Wt?
Also schematic, does not have to be with source code.
Because, sincerely, I don't like use WTimer for query the state of the
application from time to time, but I could wrong. Which do you prefer?
Bye.
2009/1/19 Wim Dumon <[email protected]>
> Hello Marco,
>
> No, you cannot use a WTimer outside the context of a session.
>
> What you should probably do:
> - In main(), start a thread where you perform your CAN-bus related
> work. Everything that the system has to do regardless of who uses the
> user interface, is to be done in this thread. Feel free to use sleep()
> to make this thread wait for a while; this will not block the
> interactivity of Wt. I would recommend not to update the widget tree
> from this thread (in any case, lock the Wt threads if you plan to do
> so!), but query the application state from time to time from within
> the GUI threads.
> - Call WRun() to start the user interface
> - Let the Wt GUI query the state of the application from time to time
> (e.g. using WTimer objects), making sure that you lock your data
> structure (e.g. using mutexes) when appropriate.
>
> Wt uses boost's signal library, and you're free to use that too in
> your threads. Note that the boost signal library does not protect you
> from concurrency problems, that remains your responsibility. The Wt
> threads can be locked by calling WApplication::getUpdateLock().
>
> Regards,
> Wim.
>
> 2009/1/19 Marco Faletra <[email protected]>:
> > Hi all, this is my first post.
> >
> > First of all "Well done WT's boys" for your work!
> >
> > Also I would want to make an application like this, with a part that
> > communicates via CAN-bus and front-end via web.
> > This application must work also without a connected browser.
> > I have read that I can do this with WTimer in the front-end side that
> read
> > the state of communication, but is it possible using "signal/event" in an
> > application like this, without the GUI uses the WTimer to refresh the
> > internal state?
> > I have tried to write a program with a thread before WRun, but when it
> send
> > the "emit" the program crash (I think because the sender of the emit is
> in
> > another thread)!
> > Is it impossible create a WTimer before WRun or without that a browser
> start
> > a comunication with http server?
> >
> > Regards,
> > Marco.
> >
> >
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