pyusb

问题 I'm trying to output a string from a barcode or qrcode using a Honeywell USB 3310g scanner in Ubuntu. I have libusb and a library called metro-usb (http://gitorious.org/other/metro-usb) which are enabling my scanner to work. If i open gedit and scan, I successfully get the qrcode data fine! I need to be able to build this pragmatically and send the data to a web service. I've downloaded and instally pyusb and this seems to be the best solution best on my research. I have a script based on

问题 I am trying to send data to a usb stick using the python library PyUSB. The code I am using is the following: import usb.core import usb.util # find our devices #dev = usb.core.find(idVendor=0xfffe, idProduct=0x0001) dev = usb.core.find(idVendor=0x090c, idProduct=0x1000) # was it found? if dev is None: raise ValueError('Device not found') # set the active configuration. With no arguments, the first # configuration will be the active one dev.set_configuration() # get an endpoint instance cfg =

问题 hey i am trying to run the simple script available in the tutorial;. the usb is getting imported but when i try to search the device i get the following error,please help >>> dev=usb.core.find() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python27\lib\site-packages\usb\core.py", line 819, in find raise ValueError('No backend available') ValueError: No backend available 回答1: You need to install libusb-1.0, libusb-0.1, or openusb as a backend to pyusb. Is

问题 hey i am trying to run the simple script available in the tutorial;. the usb is getting imported but when i try to search the device i get the following error,please help >>> dev=usb.core.find() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python27\lib\site-packages\usb\core.py", line 819, in find raise ValueError('No backend available') ValueError: No backend available 回答1: You need to install libusb-1.0, libusb-0.1, or openusb as a backend to pyusb. Is

问题 I know similar things have been asked, but none of the solutions work for me/I get different errors. I am trying to install PyUSB on a 64-bit Windows 7 VM, with Python 2.7. When I run the install from command line, i get error: Unable to find vcvarsall.bat. When I try to run the compiled executable to install, I get an error saying Python 2.7 was not found in the registry. Any help with this would be greatly appreciated. 回答1: If you haven't installed VS 2008, don't. If you have installed VS

问题 I just began to use pyusb, and basically I'm playing with the sample code here. I'm using Windows7 64 bit, and downloaded the zip version from https://walac.github.io/pyusb/. Backend is libusb-1.0.19 that is downloaded the windows binary from http://libusb.info/. All of my code is: dev = usb.core.find(idVendor=3544, idProduct=9736) if dev is None: sys.stdout.write("No device found") return; print "deviceClass = " + str(dev.bDeviceClass); for cfg in dev: sys.stdout.write("configuration: " +

问题 I am using escposprinter python library for printing my data in thermal printer. It depends on pyusb. the library is working fine in linux . While in windows 7 ,i get the it have some issues. Here are output i get. File "main.py", line 1, in <module> from app import app File "D:\freeth-in-erp-60ab8eb96fad\app\__init__.py", line 94, in <module> from .api_routes import * File "D:\freeth-in-erp-60ab8eb96fad\app\api_routes.py", line 44, in <module> from .printer import pos File "D:\freeth-in-erp

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 8 years ago . I am unable to proceed on how PyUSB works. I am stuck for a week now. How do I proceed? 回答1: At first glance, documentation for PyUSB seems to be entirely absent. But not so. From a Python prompt you can: >>>

问题 I am using USB library in python. I can see the device, i can configure it. but when I read out of it I always get the same stuff array('B', [17, 96]). Note, even if I don't write into the endpoint output I still get the same result when I read; I can also read as many times as I want and still get the same result (see full code below) the lsusb command shows it is a FTDI USB device Bus 009 Device 008: ID 0403:faf0 Future Technology Devices International, Ltd in past, i was able to

问题 I'm trying to create USB driver object using pyusb for my code, and the return from reading operation always return '1', I search the web for a while, and I couldn't find any solution, please try to help me understand what am I'm doing wrong. Environmental properties: Using python 3.7 with pycharm on windows 10. Imported all necessary packages (usb.core, usb.util) of course after installing the pyusb module. The object I'm trying to build: class UsbDev: def __init__(self, VID, PID): self