Re: [pyusb-users] pyUSB - delayed sending to the device? / Ubuntu 19.10

[Marcin C. <mar...@gm...>]

I found it!

def__del__(self):
ifself.device isnotNone:
self.device.reset() ############### <<<< THIS IS THE KEY>>>> (added to
all code)
usb.util.dispose_resources(self.device)
W dniu 01.04.2020 o 09:09, Tormod Volden pisze:
> 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
>
>
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