[K12OSN] Re: OT: Teachertool snapshots not working

Robert Arkiletian robark at gmail.com
Sat Jan 10 21:33:09 UTC 2009

On Sat, Jan 10, 2009 at 7:32 AM, David Hopkins <dahopkins429 at gmail.com> wrote:
>> Usually if the snapshot part does not work in FL_TT, the Monitor/Control
>> portion does not work either. Have you tried these by chance? If you
>> like you can try installing this via the rpm's I made. I have never
>> gotten any feedback on any X86_64 try outs,though.The rpm's do  all the
>> permissions voodoo in the install so it ends up being pretty simple.
>> If you'd like to give it a try here is the url:
> Monitor/Control/Broadcasts/Spotlight works perfectly.

if monitor/control is working then check to see you have vncsnapshot
and imagemagick (man convert) . What I do is first grab the full
screen image with vncsnapshot then I resize the image with convert.

here is the code that does it

first I check to see the client is up with ping (if success then I
take the snapshot)

lines 810-820

basically it's

/usr/bin/vncsnapshot  -passwd  /opt/ltsp/i386/root/.vnc/passwd
-encodings hextile  -allowblank  ws250.ltsp:0

btw I create a folder in /tmp to store the shots

lines 598-605

these lines are for version 0.62

>> ftp://eazylivin.net/server/fl_teachertool-0.62/
>> Also are you sure the clients are getting correct hostnames?,,
>> ws001 ,  ws002  ?
> The only thin clients where using hostname in a shell at the client
> returns the name are those with dhcp reservations defined.  But, as
> mentioned, on the i386 system, snapshots work for all thin clients
> regardless of whether they know their hostname.  Ping does work
> properly. e.g. ping ws001.ltsp works even though ws001.ltsp doesn't
> know its hostname so dns is working properly in this respect. After
> looking at the source code I think  I'll go in sometime this weekend
> and see if I can just use vncsnapshot manually from a shell,
> replicating the command that FL_TT is using.
> Thanks!
> Dave Hopkins
> Newark Charter School
> Newark Delaware
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Robert Arkiletian
Eric Hamber Secondary, Vancouver, Canada
Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
C++ GUI tutorial http://www3.telus.net/public/robark/

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