Read Failed at cupsBackChannelRead

Michael Sweet msweet at apple.com
Tue Nov 17 23:21:35 PST 2009


Since the USB backend does not support back-channel data on Linux, there is NO WAY for you to do what you want.

On Nov 17, 2009, at 9:53 PM, Zebra wrote:

> 
> Hi,
> 
> 
>    I am using USB printer ,whatever i am sending the printer responding,for example i am sending "\033R\r" the printer gets restart,like this i want to send and read the response from printer if back-end doesn't support the back channel means what i should do to read a response even cupsSideChannelRead() and cupsSideChannelWrite() also return -1.for this thing what i should do.
> 
> Please Guide me to resolve this
> 
> Regards
> 
> SivaKumar
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> On Nov 17, 2009, at 7:51 PM, Zebra wrote:
>>> ...
>>>    I am connecting printer using USB port.
>> 
>> 
>> On Linux, the USB backend does not support back-channel.
>> 
>> ___________________________________________________
>> Michael Sweet, Senior Printing System Engineer
>> 
>> 
>> 
> 
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___________________________________________________
Michael Sweet, Senior Printing System Engineer







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