[Gambas-user] App idle with long loops

Jorge Carrión shordi at ...626...
Sun Oct 9 12:56:39 CEST 2016


Is there any example of task fork use? I have a proyect who sending massive
e-mails to our customers and I guess that task can be a good solution...

Regards

2016-10-08 23:54 GMT+02:00 Demosthenes Koptsis <demosthenesk at ...626...>:

> On 8/10/2016 19:09 μμ, Tobias Boege wrote:
> > On Sat, 08 Oct 2016, Demosthenes Koptsis wrote:
> >> Hello,
> >>
> >> i have very long (time consuming) For loops and my app is frozen until
> >> loop is finished.
> >>
> >> for example i wget urls with a custom Sub which Shell("wgetURLS.sh") To
> >> sOUTPUT
> >>
> >>     'get urls
> >>     For i = 0 To iDepth
> >>       wgetURLS(i * 10)
> >>     Next
> >>
> >> Public Sub wgetURLS(iStart As Integer)
> >> .....
> >>
> >> Shell("wgetURLS.sh") To sOUTPUT
> >>
> >> .....
> >>
> >> --------------
> >>
> >> Is there possible to set the gui idle and the same time run For...loops?
> >>
> > If you only want to refresh the GUI (e.g. if your For loops update a
> > ProgressBar on your form and you want to update the value of that bar
> > during the loop), then Wait [1] is sufficient.
> >
> > If you want the GUI to be fully operatable while your loops run in the
> > background, you have to use a background Task [2]. As Gambas is single-
> > threaded, Tasks are implemented as external processes which execute one
> > of your classes. This limits the things you can do with Tasks (you cannot
> > directly modify the main program, for example, but have to send data and
> > status reports through a pipe from your Task to the main process and
> > interpret them there). However, if all you want is loading some files via
> > wget, that should not be a problem.
> >
> > Of course, there is also the gb.net.curl component which can download
> files
> > asynchronously. If you can use that (which depends on what you want to
> do),
> > you should.
> >
> > And as a fourth option, looking further into your code: if you want to
> > execute shell scripts in a For loop, then don't use the Shell-To syntax
> > but create a Process object instead and accumulate its output in Read
> > events. The event loop will take care of everything and the GUI will be
> > usable without any extra effort on your side.
> >
> > Finding the best solution depends, who would have thought, on what you
> want
> > to do *specifically*. Tasks are the most general and most cumbersome
> option.
> >
> > Regards,
> > Tobi
> >
> > [1] http://gambaswiki.org/wiki/lang/wait
> > [2] http://gambaswiki.org/wiki/comp/gb/task
> >
> Thanks very much for the details.
>
> Regards,
>
> Dim
>
>
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