I Am saying that if your depending on the GUI for any part of your program it may expect the xwindow system to be active before it starts, then seeing that the GUI is not running just exits.
It's hard to second guess what your program is doing here but it "may" be the issue. try checking for the xwindow system being running before starting your program. On 4/16/2016 6:16 PM, John Baker wrote: > Hi Wulf Man, > My GUI is part of a simulation program. There's a lot of calculation > and the GUI to allow me to enter some parameters and display the > results on a graph. You're saying that I have to start up my > calculation part of the program and then the GUI? > John > > On Saturday, April 16, 2016 at 5:37:07 PM UTC-7, Wulf Man wrote: > > If this is a GUI only program you need to start your program > after the GUI is up, I don't see this check in your crontab file > Been too long since i have done this but i am sure google is your > friend > > > > On 4/16/2016 4:53 PM, John Baker wrote: >> Hi Dieter, >> Still not working. I have a hunch that the problem is with >> Tkinter but can't tell. I have to run my GUI program SimB.py with >> the terminal program on the BBB, typing sudo python SimB.py, then >> it runs happily. >> >> *Here's my crontab in /etc:* >> # /etc/crontab: system-wide crontab >> # Unlike any other crontab you don't have to run the `crontab' >> # command to install the new version when you edit this file >> # and files in /etc/cron.d. These files also have username fields, >> # that none of the other crontabs do. >> >> SHELL=/bin/sh >> PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin >> >> # m h dom mon dow usercommand >> 17 ** * *root cd / && run-parts --report /etc/cron.hourly >> 25 6* * *roottest -x /usr/sbin/anacron || ( cd / && run-parts >> --report /etc/cron.daily ) >> 47 6* * 7roottest -x /usr/sbin/anacron || ( cd / && run-parts >> --report /etc/cron.weekly ) >> 52 61 * *roottest -x /usr/sbin/anacron || ( cd / && run-parts >> --report /etc/cron.monthly ) >> # >> @reboot root /usr/bin/python /home/debian/Desktop/SimB.py >> * * * * * root /usr/bin/python /home/debian/Desktop/SimB.py >> >> *and here's from the syslog file that doesn't tell me anything:* >> >> Apr 16 23:37:01 beaglebone /USR/SBIN/CRON[2293]: (root) CMD (sudo >> python /home/debian/Desktop/SimB.py) >> >> Apr 16 23:37:01 beaglebone /USR/SBIN/CRON[2294]: (debian) CMD >> (sudo python /home/debian/Desktop/SimB.py) >> >> Apr 16 23:37:01 beaglebone /USR/SBIN/CRON[2295]: (root) CMD >> (/usr/bin/python /home/debian/Desktop/SimB.py) >> >> Apr 16 23:37:14 beaglebone /USR/SBIN/CRON[2292]: (CRON) info (No >> MTA installed, discarding output) >> >> Apr 16 23:37:14 beaglebone /USR/SBIN/CRON[2290]: (CRON) info (No >> MTA installed, discarding output) >> >> Apr 16 23:37:14 beaglebone /USR/SBIN/CRON[2291]: (CRON) info (No >> MTA installed, discarding output) >> >> >> I can successfully run my program with a keyboard attached to my >> BBB using sudo python SimB.py, have to use the sudo, otherwise >> gets a Tkinter error. I just now double-checked and my GUI >> program SimB.py runs very happily. Cannot run SimB.py thru putty >> as it gives the Tkinter error. >> >> Any ideas? >> Thanks, >> John >> >> On Saturday, April 16, 2016 at 1:04:21 AM UTC-7, Dieter Wirz wrote: >> >> On Sat, Apr 16, 2016 at 5:57 AM, John Baker >> <bakerengi...@gmail.com>wrote: >> >> John Minton, >> I gave crontab a try and of course it didn't work. It >> seems like this should be a piece of cake to do. I >> probably did something wrong. I checked the syslog and >> see an error: "No MTA installed." >> >> >> >> If u >> >> have an error in crontab the crontab tries to send you an >> Email... And of coarse cannot without MTA;) >> >> My crontab file says: >> >> @reboot sudo python /home/debian/Desktop/myProg.py >> * * * * * sudo python /home/debian/Desktop/myProg.py >> >> >> The are two crontabs, users and system crontab. >> Users crontab you can change with >> $ crontab -e >> System crontab with >> $ sudo nano /etc/crontab >> >> If u want to run a process as root, then best is, if u add >> >> @reboot root /usr/bin/python /home/debian/Desktop/myProg.py >> * * * * * root /usr/bin/python /home/debian/Desktop/myProg.py >> >> to /etc/crontab >> >> HTH >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, >> send an email to beagleboard...@googlegroups.com <javascript:>. >> To view this discussion on the web visit >> >> https://groups.google.com/d/msgid/beagleboard/ad44be62-e803-43e8-b131-131d16fd92f9%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/ad44be62-e803-43e8-b131-131d16fd92f9%40googlegroups.com>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > > <https://www.avast.com/en-us/lp-esg-fav?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-b> > Virus-free. www.avast.com > > <https://www.avast.com/en-us/lp-esg-fav?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-b> > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/116fae1e-3ad7-4949-87ee-63a907b32cda%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/116fae1e-3ad7-4949-87ee-63a907b32cda%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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