Rastertocard filter

[shermin]

Hi,
 i opt for the last option that is bagging all the printer driver info to the backend since i have already wrote my custom backend for my usb printer.So in ppd file how will i specify to use my backend directly without any filter??By commenting the *cupsFilter option there?????Whether that you meant by the statement "have the PPD file specify that the printer supports CUPS raster data directly."

Also i have to write the printer specific information in the print_device function in the backend right?????

Shermin



> shermin wrote:
> > Hi,
> > I am developing my filter for my card printer.My printer cmd is actually based on usb mass storage device,Sending the cmd thru "CBW" and read the status through "CSW".But in standard filters coming with CUPS commands are send using printf.In my case if i use "usb_bulk_write" whether my filter will work.??How will i map it to "printf" in cupsd.
> > Or if i use putchar a,how will i read the status from the printer?????
>
> There are a few ways to approach this.
>
> First, you can write your backend so that it either understands the
> printer commands you write to stdout from the filter (which your
> backend sees on its stdin) and then follow the write with a read
> that you relay back to the filter via cupsBackChannelWrite.
>
> Second, you can add a packet/command layer to the data you write from
> the filter that your backend understands - basically, an extra layer
> on top of the printer commands.  Again, the backend would read the
> data from the filter and read/write as needed.
>
> Finally, you can move the printer driver stuff into your backend, and
> have the PPD file specify that the printer supports CUPS raster data
> directly.  Then your filter (now a backend) can communicate directly
> with the printer...
>
> --
> ______________________________________________________________________
> Michael R Sweet                        Senior Printing System Engineer
>