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Separate method open() and constructor, enhance consistency between connectors. (#584)

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* Add self-open mechanism
* self-open mechanism through the 'device' property
* Separate open() and store connection in 'device'
* Restore device status to False on close()
* Add default value to all params + type annotations
* Add generic DeviceNotFoundError exception
* Update USBNotFoundError return code
* Enhance connectors consistency
* Fix LP printer stall
* Fix LP waste of paper due to auto-flush + flush on close
* Move platform dependent printers' guard to init

---------

Co-authored-by: Patrick Kanzler <4189642+patkan@users.noreply.github.com>
This commit is contained in:
Benito López
2023-10-16 11:36:07 +02:00
committed by GitHub
parent 3a8af8a6f5
commit a00b98937b
10 changed files with 537 additions and 179 deletions
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37
src/escpos/exceptions.py
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@@ -13,7 +13,8 @@ Result/Exit codes:
- `60` = Invalid pin to send Cash Drawer pulse :py:exc:`~escpos.exceptions.CashDrawerError`
- `70` = Invalid number of tab positions :py:exc:`~escpos.exceptions.TabPosError`
- `80` = Invalid char code :py:exc:`~escpos.exceptions.CharCodeError`
- `90` = USB device not found :py:exc:`~escpos.exceptions.USBNotFoundError`
- `90` = Device not found :py:exc:`~escpos.exceptions.DeviceNotFoundError`
- `91` = USB device not found :py:exc:`~escpos.exceptions.USBNotFoundError`
- `100` = Set variable out of range :py:exc:`~escpos.exceptions.SetVariableError`
- `200` = Configuration not found :py:exc:`~escpos.exceptions.ConfigNotFoundError`
- `210` = Configuration syntax error :py:exc:`~escpos.exceptions.ConfigSyntaxError`
@@ -275,11 +276,35 @@ class CharCodeError(Error):
return "Valid char code must be set ({msg})".format(msg=self.msg)
class USBNotFoundError(Error):
"""Device was not found (probably not plugged in).
class DeviceNotFoundError(Error):
"""Device was not found.
The device seems to be not accessible.
The return code for this exception is `90`.
inheritance:
.. inheritance-diagram:: escpos.exceptions.Error
:parts: 1
"""
def __init__(self, msg=""):
"""Initialize DeviceNotFoundError object."""
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 90
def __str__(self):
"""Return string representation of DeviceNotFoundError."""
return f"Device not found ({self.msg})"
class USBNotFoundError(DeviceNotFoundError):
"""USB device was not found (probably not plugged in).
The USB device seems to be not plugged in.
The return code for this exception is `90`.
The return code for this exception is `91`.
inheritance:
@@ -292,11 +317,11 @@ class USBNotFoundError(Error):
"""Initialize USBNotFoundError object."""
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 90
self.resultcode = 91
def __str__(self):
"""Return string representation of USBNotFoundError."""
return "USB device not found ({msg})".format(msg=self.msg)
return f"USB device not found ({self.msg})"
class SetVariableError(Error):