charlesg ha scritto:
> Hi,
>
> I tried printing line-by-line directly to the raw device and got into awful
> overlapping (? buffering) problems.
>
> I think you would be far better to create a single line text file each time
> and then print it with (for example):
> SHELL "cat /home/charles/tilRcpt>/dev/lp0"
>
> It's blindingly quick and for me is absolutely reliable. As usual, I am sure
> there are more elegent solutions :)
>
> I also had to set write permission to the device in form_open something
> like:
> SHELL "gksu -u root 'chmod a+rw /dev/lp0'"
> Its a pain to have to supply a password, but it only does it once.
>
>
Beware... I don't know if your overlapping problem is caused by
buffering (I don't think so), but I am sure that in unix, text line are
terminated by a single LF (line feed). For the printer, it means to go a
line down, but not to reposition the printing head to the beginning of
the line. What you obtain if you fail to do so, is something like this:
line1
line2
line3
It depends also on the kind of printer. I am sure that all old impact
printer do so; the most modern ones, perhaps using postscript directly,
can behave differently. You must add a CR (carriage return) to correctly
print lines of text on an impact printer.
Regards,
Doriano
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