2015-06-11 16:44 GMT-03:00 Jay Newens <j...@nemo-q.com>: > I am using pyusb in my Python 2.7 environment getting the status of the > Zebra KR403 printer and having good success on a Windows 7 64 bit PC. Now I > am ready to test this on my target machine. I have created my executable > program with py2exe and tested the exe on my development PC and it works > fine but when I move it to my target PC I get a message “No Backend > Available” when it gets to the “dev = usb.core.find(idVendor=int(VID), > idProduct=int(PID))” part of my code. I convert the hex to an integer here > but when using the hex value I get the same issue on my target PC, even with > hex value, both hex and converting to integer work fine on the development > PC so I do not think the issue is here. >
PyUSB on Windows depends either of libusb 1.0 or libusb-win32. Contrary to the unices version, libusb on Windows needs to attach as a device driver. You can use zadig to install libusb (or libusb-win32) driver for your device. libusb uses the WinUSB driver (which is shipped with Windows). If you want to redistribute your software to users, you will have to provide a driver package to the user (basically writing an inf file and ship the binaries). However, giving details on how to do that is out of scope of this mailing list. OSR [1] can be helpful here [1] http://www.osronline.com/ > > > Traceback (most recent call last): > > File "ZebraKR403PaperStatus1.0.py", line 98, in <module> > > File "usb\core.pyc", line 846, in find > > ValueError: No backend available > > > > I am not sure what is causing the issue. It seems as though there is a > missing dll or something that is required to make this work and it did not > make it to my target PC. Any suggestions or ideas what I may be missing > would be greatly appreciated. > > > > > > Jay > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > pyusb-users mailing list > pyusb-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pyusb-users > -- Best Regards, Wander Lairson Costa ------------------------------------------------------------------------------ _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
