cupsConnectDest fails when dest pointer is obtained by name

[RolandHughes]

Ubuntu 20.04 doing C++ development

cups:
  Installed: 2.3.1-9ubuntu1.9
  Candidate: 2.3.1-9ubuntu1.9
  Version table:
 *** 2.3.1-9ubuntu1.9 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2.3.1-9ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

Could have swore I posted this yesterday but don't see it. My apologies if this is fixed in later Cups releases but my searches didn't find any mention of it.

In the standard example program one sees this.

cupsEnumDests(CUPS_DEST_FLAGS_NONE, 1000, NULL, 0, 0, print_dest, NULL);

and in the print_dest routine this

http_t *http = cupsConnectDest(dest, CUPS_DEST_FLAGS_DEVICE, 30000, NULL, resource, sizeof(resource), NULL, NULL);
all works well and good

if, however, you obtain your dest pointer via

m_cupsDest = cupsGetNamedDest( CUPS_HTTP_DEFAULT, cupsGetDefault(), NULL);

you have to connect like this

http_t *http = cupsConnectDest( m_cupsDest, CUPS_DEST_FLAGS_NONE, 30000, NULL, m_resource, RESOURCE_SIZE, NULL, NULL );
because CUPS_DEST_FLAGS_DEVICE will never work.

Is this a bug or is there a logical reason for this that simply escapes me? If it is a bug has it been fixed in later versions of cups and if so, what version?

Thank you

[michaelrsweet]

CUPS_DEST_FLAGS_DEVICE means "connect to the device", which only works for IPP printers.

What example are you referencing?

[RolandHughes]

CUPS_DEST_FLAGS_DEVICE means "connect to the device", which only works for IPP printers.

What example are you referencing?

https://www.cups.org/doc/cupspm.html

[RolandHughes]

All of the printers on this network are IPP printers.