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I need to test an Epson POS printer, TM-U220PD. I have it connected by a Parallel converter to my laptop. It's completely installed, but when I test it with python escpos shows me the following error: 

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/escpos/escpos.py", line 437, in text
    self._raw(txt.encode())
  File "/usr/local/lib/python2.7/dist-packages/escpos/printer.py", line 85, in _raw
    self.device.write(self.out_ep, msg, self.timeout)
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 948, in write
    self.__get_timeout(timeout)
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 824, in bulk_write
    timeout)
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 920, in __write
    _check(retval)
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 595, in _check
    raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 32] Pipe error

This is the code used to test:

>>> from escpos.printer import Usb
>>> p = Usb(0x067b, 0x2305)
>>> p.open()
>>> p.text()
4

1 回答 1

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这样的 USB 到并行转换器应该由您的系统安装到文件系统中（从您的跟踪来看，我假设您在 *nix 上）。通常这类似于/dev/usb/lp0.

对于第一次调试，您可以尝试仅写入此“文件”：

echo "Test\n" > /dev/usb/lp0

如果这可行，您应该能够成功打印：

from escpos.printer import File
p = File(devfile='/dev/usb/lp0')
p.text("some text\n")
于 2017-10-08T20:45:20.483 回答