It's strange that I was using GitFileTree over OSProcess for a long time without issue and yet every time I tried to use OSProcess directly I had this locking up.

> So I am asking polite to the pharo developers team if there are plans to
> provide a stable solution for calling external programs as described.
>
> My production system will be a windows system, so I need this for windows,
> too.
> As far as I understand, the new OSSubprocess is (currently) only for unix.

Yes, there's ProcessWrapper for Windows.

An alternative approach might be to use direct FFI calls, e.g.

MyClass class>>system:
        system: command
        "Perform OS system() call."

        ^ self ffiCall: #(int system #(char * command)) module: LibC

And then you can do MyClass system: 'cp a.pdf b.pdf'.

Although it still locks up my image from time to time… but at least order of magnite less.

Also if you are targeting Windows, I suggest to look at Torsten's 'OSWindows' project (available from the catalog browser).

Peter


>
> It is no problem for me to wait some time for this.
> But it would be nice to know what the plans are, to decide what to do (and
> not programming something which will be solved in future).
>
> Regards
> Sabine
>
>
>
>
> 2016-06-07 9:43 GMT+02:00 Thierry Goubier [via Smalltalk] <
> [hidden email]>:
>
> > Hi Sabine,
> >
> > which version of Pharo are you using? I had similar issues, and I managed
> > to reduce those occurrences to a reasonable level by changing the way I
> > called OSProcess (and a lot of help from Dave). I do have sometime lockups
> > with OSSubprocess as well, but those are also rare.
> >
> > (I do think this is a bug somewhere in the VM which makes it loose signals)
> >
> > The code I use is in GitFileTree: a low-level way of calling OSProcess
> > which seems good at minimizing lockups.
> >
> > Thierry
> >
> >
> >
> > 2016-06-07 9:31 GMT+02:00 Sabine Manaa <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4899548&i=0>>:

> >
> >> Hi,
> >>
> >> sorry but I have another issue with OSProcess.
> >>
> >> For my app, I want to show small .png previews from my .pdfs. For this
> >> reason, I use an external software, currently pdfbox. It works fine, but
> >> regularly, I get a hanging image. I tried to reproduce it and found out,
> >> that it is not a problem with pdfbox (http://pdfbox.apache.org), because
> >> from command line, I can call it often without problems. There can be
> >> (hopefully) many users in my app with many previews at one time. So I have
> >> to call it often.
> >>
> >> For reproduction of the OSProcess issue, I used another simple command
> >> (from
> >> my other OSProcess umlaut issue :-)) to test it.
> >>
> >> calling this, results in a non responding image:
> >>
> >> 20 timesRepeat: [OSProcess   command: ('cp
> >> /Library/WebServer/Documents/reports/bar.pdf
> >> /Library/WebServer/Documents/reports/test-c.pdf').].
> >>
> >> also this:
> >> 20 timesRepeat: [OSProcess   command: ('echo "Hi there"').]
> >>
> >> My original code is similar to this but here only for information:
> >> OSProcess
> >>                 command:
> >>                         ('{1} -jar {2} PDFToImage -format PNG -page 1
> >> -dpi 100 {3}'
> >>                                 format:
> >>                                         {'Library/Internet\
> >> Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java'.
> >>
> >> '/Users/sabine/Desktop/pdfbox-app-2.0.1.jar'.
> >>
> >>
> >> '/Library/WebServer/Documents/reports/201411121510-112859865-3378921/20150605_170_IFA_Berlin_Reisekostenabrechnung.pdf'}).
> >>
> >>
> >> So, my question is: is it wrong, calling OSProcess like this? How to do it
> >> instead?
> >>
> >> I am sorry to ask again and hope that there is a simple solution.
> >> Or is it a bug in OSProcess?
> >>
> >> Regards
> >> Sabine
> >>
> >>
> >>
> >>
> >> --
> >> View this message in context:
> >> http://forum.world.st/OSProcess-command-non-responding-image-when-calling-often-tp4899540.html
> >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
> >>
> >>
> >
> >

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