Problem in ethernet printer

[Michael Sweet]

That might be the case for the Linux USB backend since we've disabled backchannel, but not for the socket backend.

In any case, NO DRIVER CAN DEPEND ON BACK-CHANNEL SUPPORT SINCE NOT ALL BACKENDS SUPPORT IT.  This is spelled out in the CUPS documentation and has always been the case.

On Feb 22, 2010, at 11:18 PM, kavin wrote:

> Hi,
>      The cupsBackChannelRead doesnt gives anything it always returns -1.
> 
> 
> 
> 
>> On Feb 22, 2010, at 8:00 PM, kavin wrote:
>>> Hi,
>>>       The following code will query the our zebra printer for error.
>>> =20
>>> memset(port_monitor_buffer,0,sizeof(port_monitor_buffer));
>>> retn =3Dwrite(device_fd,"\033E 1\r",5);
>>> retn =3Dread(device_fd,port_monitor_buffer,sizeof(port_monitor_buffer));=
>> 
>>> =20
>>>      so i put this code in backend the same code in USB backend works =
>> fine even in Ethernet i can able to feed the command to the printer but =
>> cant able to get the response from printer thats my problem.
>>> =20
>> 
>> Please read:
>> 
>>    http://www.cups.org/documentation.php/api-filter.html
>> 
>> You should never modify the standard CUPS backends to write out =
>> printer-specific data. Instead, send the commands from your filter and =
>> then read the response back using cupsBackChannelRead.  You can also =
>> search for similar posts in cups.development and cups.general with more =
>> example code.
>> 
>>> =20
>>>>> Hi,
>>>>> 	I am trying to get the printer response for particular commands. =
>> =3D
>>>> I written the following code inside the socket.c after the function =3D=
>> 
>>>> backendrunloop.the Same code at same place written in usb-unix.c =
>> gives =3D
>>>> to me a proper response.
>>>>> =3D20
>>>>>      memset(port_monitor_buffer,0,sizeof(port_monitor_buffer));
>>>>> 	retn =3D3D write(device_fd,"\033E 1\r",5);
>>>>> 	retn =3D3D =3D
>>>> read(device_fd,port_monitor_buffer,sizeof(port_monitor_buffer));
>>>>> =3D20
>>>>> In the case of socket it doesnt gives any response but the command =3D=
>> 
>>>> goes to the printer in proper manner
>>>>> please give me the guidence to resolve the problem
>>>>> =3D20
>>>>> =3D20
>>>>> _______________________________________________
>>>>> cups-ddk mailing list
>>>>> cups-ddk at easysw.com
>>>>> http://lists.easysw.com/mailman/listinfo/cups-ddk
>>>> =20
>>>> ___________________________________________________
>>>> Michael Sweet, Senior Printing System Engineer
>>>> =20
>>>> =20
>>>> =20
>>> =20
>>> _______________________________________________
>>> cups-ddk mailing list
>>> cups-ddk at easysw.com
>>> http://lists.easysw.com/mailman/listinfo/cups-ddk
>> 
>> ___________________________________________________
>> Michael Sweet, Senior Printing System Engineer
>> 
>> 
>> 
> 
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___________________________________________________
Michael Sweet, Senior Printing System Engineer