On 12/07/14 23:52, Torfinn Ingolfsen wrote:
Question: is writing to the device file (/dev/ugenX) with normal file calls
supposed to work in FreeBSD?
(as in "everything is a file" in unix-like operating systems)
Background: I recently got a usb label printer for cheap: a Dymo LabelManager
PnP. I found the dymoprint Python script, which works fairly well on
It works (AFAICT) by reading / writing the usb device as a regular file, via
the device file.
You have to use usb_modeswitch on the printer first, of course.
/dev/ugenX is not a stream. You should either consider using libusb or
If it is supposed to work with those devices, you should postfix the
Since we have all tools available on FreeBSD, I tried the setup on my FreeBSD
workstation, which currently runs FreeBSD 9.3-stable:
tingo@kg-core1$ uname -a
FreeBSD kg-core1.kg4.no 9.3-STABLE FreeBSD 9.3-STABLE #0 r273918: Fri Oct 31
22:52:44 CET 2014 r...@kg-core1.kg4.no:/usr/obj/usr/src/sys/GENERIC amd64
The detection code in the dymoprint script doesn't work on FreeBSD, but setting
the correct device via DEV_NODE in the script works:
tingo@kg-core1$ grep ^DEV_NODE dymoprint2
DEV_NODE = "/dev/ugen3.4"
But when I run the script I just get an IO error:
root@kg-core1# python dymoprint2 test
Traceback (most recent call last):
File "dymoprint2", line 313, in <module>
File "dymoprint2", line 309, in main
File "dymoprint2", line 183, in printLabel
response = self.sendCommand()
File "dymoprint2", line 80, in sendCommand
responseBin = self.dev.read(8)
IOError: [Errno 5] Input/output error
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