Unable to print multiple files to a local printer

[Japhier]

Describe the bug
i use command: lp -d printer 1.png 2.png;
but result is only printing 1.png and cups report error: print job canceled at printer(but i didn't cancel at printer)
i have test in HP printer and deli printer, see also as #5819

in code , i haved used cupsPrintFiles api, but have the same problem

cups version: v2.4.2

[zdohnal]

Hi @Japhier ,

if you use a temporary queue, it seems some models are affected by this issue - there is an question about the same thing with Brother printer #634 . I've tested it on HP Color LaserJet Pro M277dw and it worked for me, but my Canon MF443 printer has the issue. It looks it differs from model to model...

[michaelrsweet]

Does adding *cupsSingleFile: true to the PPD file and restarting cupsd help?

[Japhier]

Does adding *cupsSingleFile: true to the PPD file and restarting cupsd help?

If this parameter is configured, multiple images can be printed. However, the printer pauses for 1 to 2 seconds (from printing to idle) before printing the next file. User experience is poor.

[michaelrsweet]

@Japhier There isn't anything we can do about the delay in CUPS 2.x - that's the penalty for cupsSingleFile, and the old CUPS 2.x print path doesn't allow for input documents to be merged prior to printing.

Until CUPS 3.0 is finished, there are programs that can generate a PDF from a list of input images that will yield faster printing - ImageMagick, ippsample's ipptransform, etc.

[zdohnal]

@Japhier is the PPD generated by CUPS/cups-filters (there is IPP Everywhere/driverless in the PPD file) or classic one?

[Japhier]

@Japhier is the PPD generated by CUPS/cups-filters (there is IPP Everywhere/driverless in the PPD file) or classic one?

@zdohnal I use the IPP Everywhere print ppd file generated by cups. By default, there is no cupsSingleFile attribute, but I set single_file in cups/-ppd-cache.c to true, which also works.

[zdohnal]

@michaelrsweet can I add the PPD keyword by default when we generate the PPD?

[michaelrsweet]

@zdohnal Yes.

[Japhier]

@michaelrsweet @zdohnal Hello, two experts. I want to learn the filter development process. I plan to develop a PDFtoraster filter based on the PDFium open source library. Is this solution feasible?

[michaelrsweet]

@Japhier You could certainly write a filter - the useful life of the filter will only be a few years, however, but assuming that PDFium can be packaged outside of Chrome it would be useful to have a starting point for a standalone PDF RIP that doesn't have an unfriendly license...