[GRASS-dev] making py.monitor listen to external commands
Benjamin Ducke
benjamin.ducke at ufg.uni-kiel.de
Fri Jun 16 07:50:40 EDT 2006
I just updated wxpython to the newest version, compiled from
source and this is the result:
File "mon.py", line 15, in ?
import wx
File
"/usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/__init__.py", line
42, in ?
from wx._core import *
File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/_core.py",
line 4, in ?
import _core_
ImportError: /usr/lib/libwx_base_odbc-2.6.so.0: symbol
_ZN9wxVariantaSEPK14tagDATE_STRUCT, version WX_2.6 no t defined in file
libwx_base-2.6.so.0 with link time reference
Forgive me, but I am starting to like Tcl/Tk more and more.
That has worked for me without a flaw since 1996 ...
Benjamin
Jáchym Čepický wrote:
> Hallo,
>
> I just tryed the py.mon stuff on win xp box and it nearly worked :-) the window appears, but I did not manage to display any map.
> this just means, that used approach (python + wxwidget) seem really to work on windows and that it can use at least some commands from grass via os.system()
>
> screenshot on les-ejk.cz/tmp/pymon-win.png [0.5 MB]
>
> Have a nice weekend
>
> Jachym
>
> P.S. I used Wingrass (qgis+grass) precompiled package from Radim, started qgis, started GRASS-Shell and run. Maybe in commandline.exe it would work better?
> --
> Jachym Cepicky
> e-mail: jachym.cepicky at centrum.cz
> URL: http://les-ejk.cz
> GPG: http://les-ejk.cz/gnupg_public_key/
> -----------------------------------------
> OFFICE:
> Department of Geoinformation Technologies
> LDF MZLU v Brně
> Zemědělská 3
> 613 00 Brno
> e-mail: xcepicky at node.mendelu.cz
> URL: http://mapserver.mendelu.cz
> Tel.: +420 545 134 514
>
>
>
>
>
> ______________________________________________________________
>
>>Od: jachym.cepicky at centrum.cz
>>Komu: grass-dev at grass.itc.it
>>Datum: 12.06.2006 20:32
>>Předmět: [GRASS-dev] making py.monitor listen to external commands
>>
>>Hallo,
>>
>>I'm trying to script something, which could be in the future called
>>py.mon(itor) using wxpython together with xrc.
>>
>>The basic is here - I can display ppm file
>>
>>Now, I would like to make it "listen" to command line commands and I
>>have been thinking of approach like this:
>>
>>The idea is, you would tip just normal py.* commands in the command line,
>>but there would be process running in background, which would pick up
>>the last line from history file (e.g. .monitor_x0_history) and add it to
>
> stack of
>
>>commands for the monitor.
>>
>>We would have to create set of py.* commands, which would replace the
>>d.* commands and general structure of this py.* commands would look like
>>this:
>>
>>---------------------------
>># py.rast
>>
>># get the selected monitor
>>monitor = os.getenv("GRASS_MONITOR")
>>
>># get the file name
>>command_file =
>
> os.path.join(GISBASE,LOCATION,MAPSET,".monitor_"+monitor+"_history)
>
>># write d.rast to commands
>>file = open(command_file,"a")
>>file.write("d.rast "+sys.arg[1:])
>>file.close()
>>---------------------------
>>
>>Then there should be loop in py.monitor:
>>
>> 1) watcher(), which would take care on the .monitor_x0_history file
>
> just like tail -f does
>
>> if there would be some change, it would add command to the
>> monitor commands stack and redraw the monitor with new set of
>> commands
>>
>> 2) pymonitor.MainLoop(), which displays the gui and sets the
>> variables
>>
>>So, I have monitor (see screenshot [1]), I can tip commands in some
>>"terminal" under the window. I have "watcher" which takes care on the
>>command file and if there is some change, it should set the "monitor
>>terminal" to the value of the command(s) to new command.
>>
>>But it does not because the processes do not "see" each other. I'm also
>>not able to kill the processes while closing the monitor, because of I'm
>>not able to get their PIDs.
>>
>>So my question: how to perform task like this? I know, this is task for
>>"reall" programmers, maybe I choosed completly wrong approach.
>>
>>I took the code from
>>http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012 and
>>modified it like this:
>>
>>-------------------------------
>>class Monitor(wx.App):
>> """
>> py.monitor gui
>> """
>>
>> def OnInit(self):
>> """
>> Init the gui
>> """
>>
>> try:
>> pid = os.fork()
>> if pid > 0:
>> # exit first parent
>> sys.exit(0)
>> except OSError, e:
>> print >>sys.stderr, "fork #1 failed: %d (%s)" % (e.errno,
>> e.strerror)
>> sys.exit(1)
>>
>> # decouple from parent environment
>> os.setsid()
>> os.umask(0)
>>
>> # initialize the GUI
>> self.initFrame()
>> self.rast = map.raster.Raster()
>> self.initToolBar()
>> self.initCommands()
>> self.initDrawArea()
>> self.frame.Show()
>>
>> # do second fork
>> try:
>> pid = os.fork()
>> if pid > 0:
>> # exit from second parent, print eventual PID before
>> #print "Daemon PID %d" % pid
>>
>> # OnInit should return boolean value
>> return True
>>
>> #sys.exit(0)
>> except OSError, e:
>> print >>sys.stderr, "fork #2 failed: %d (%s)" % (e.errno,
>> e.strerror)
>> sys.exit(1)
>>
>> # start the daemon watcher
>> self.watcher()
>>
>>[....]
>>
>># startin the gui
>>def main():
>> pymonitor = Monitor(0)
>> pymonitor.MainLoop()
>>
>>-------------------------------
>>
>>Thanks for hints I hope, one can understand, what I wanted to say.
>>
>>Jachym
>>
>>[1] http://les-ejk.cz/tmp/py.monitor.png
>>--
>>Jachym Cepicky
>>e-mail: jachym.cepicky at centrum.cz
>>URL: http://les-ejk.cz
>>GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
>>-----------------------------------------
>>OFFICE:
>>GDF-Hannover
>>Mengendamm 16d
>>30177 Hannover
>>Germany
>>e-mail: cepicky at gdf-hannover.de
>>URL: http://gdf-hannover.de
>>Tel.: +49 511-39088507
>>
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>>
>
>
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>
--
Benjamin Ducke, M.A.
Archäoinformatik
(Archaeoinformation Science)
Institut für Ur- und Frühgeschichte
(Inst. of Prehistoric and Historic Archaeology)
Christian-Albrechts-Universität zu Kiel
Johanna-Mestorf-Straße 2-6
D 24098 Kiel
Germany
Tel.: ++49 (0)431 880-3378 / -3379
Fax : ++49 (0)431 880-7300
www.uni-kiel.de/ufg
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