The idea's marvelous. Actually, if you don't need to get control of your
pupil's computer, maybe you could do this in another way, but I'm afraid that would
take quite a bit long to implement it.
My idea is to install a screen-capture software in every computer. Then using
schedule of every computer to make a screen-shot at regular interval and put the file
in a share directory. Then your teacher's computer randomly chooses a pupil computer
and gets the screen shot from its share directory and display it.
> -----Message d'origine-----
> De : matt [mailto:[EMAIL PROTECTED]
> Envoyi : vendredi 31 octobre 2003 10:41
> @ : [EMAIL PROTECTED]
> Objet : Ultra VNC protocol differences?
>
>
> I work in a school and we want to be able to deter pupils
> from doing non-work
> related internet stuff during their lessons. For this
> purpose, I'm creating a
> Java applet that will take a single screenshot from a random
> computer in a
> room every few seconds and display it. The idea being that
> the teacher will
> run the applet on a PC possibly connected to a projector.
> This way the kids
> know that a screen grab of their desktop could appear at any
> time, and (in
> theory) do their work.
>
> I'm only using single frame screengrabs, because I don't want
> to impact on the
> performance of the PCs.
>
> I've now got the applet working perfectly for computers with
> the origional
> WinVNC server installed, but this server is very CPU hungry,
> and the PC
> freezes for a second when the screenshot is taken.
>
> I switched the servers to UltraVnc, because it is much less
> CPU hungry, but
> now the screenshots come out black. It works fine with any of
> the other
> viewers but not my applet.
>
> Does anyone know of any differences in the protocol between
> WinVNC and
> UltraVNC that might be causing this?
>
> Matt
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