On Tue, Mar 31, 2020 at 8:34 PM Marcin Chuć wrote: > > I have an ESC printer. I made a simple script to send data to the device, but > after changing the content of the script - 1x the previous version of the > subtitles is printed, and then, when called again, the current one. As if the > data from the USB was cached somewhere. How can I make some FLUSH? > > usb_= Connector(showUsbDevices=False) > usb_.send(b'I LOVE YOU')
Hi Marcin, If you look at other code for communicating with such printers, you will see that there is a lot of printer control codes and protocol on top of the USB communication. With just sending these few text characters, you are probably causing a flush of the existing buffer and at the same time filling it up again with your new text. See for instance this hint: https://github.com/mike42/escpos-php/blob/development/src/Mike42/Escpos/Printer.php#L988 Regards, Tormod _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
