How to show a message box from the filter

[keens312]

> keens312 wrote:
> >>> keens312 wrote:
> >>>>> keens312 wrote:
> >>>>>> Hello,
> >>>>>>
> >>>>>> I am developing a filter driver on Mac OSX.
> >>>>>>
> >>>>>> A messagebox(with a button on it) should be show up in some cases.
> >>>>>>
> >>>>>> Does the CUPS provide a way to define the UI in Drv file and show it up with cups APIs?
> >>>>> No, there is no way for you to directly communicate with the user.
> >>>>>
> >>>>> Keep in mind that your filter may not be running on the same system
> >>>>> as the user, or the user may not be logged onto the console when the
> >>>>> job actually gets printed.
> >>>>>
> >>>>> About all you can do is use STATE: messages to make the printer queue
> >>>>> icon bounce in the dock so that the user can correct the problem, but
> >>>>> your driver will need to monitor the printer to know when to continue.
> >>>>>
> >>>>> --
> >>>>> ______________________________________________________________________
> >>>>> Michael Sweet, Easy Software Products           mike at easysw dot com
> >>>> Hi Michael,
> >>>>
> >>>> I have to make a workaround for this, since there is no button on printer.
> >>>>
> >>>> We just take into consideration in the case that filter running on the same system as user.
> >>>>
> >>>> My plan is to call an external application in filter with LSOpenApplication API. When user click the button on the external application, triggered the job left.
> >>> That will not work - your filter isn't running as the login user and
> >>> has no access to the screen.  You MUST have a program either running
> >>> or registered with launchd in the user's account so that it can
> >>> receive the message from your filter and then display a dialog to the
> >>> currently logged in user.
> >>>
> >>> That said, a printer driver that depends on communicating with the
> >>> user will have serious issues - it won't work with printer sharing,
> >>> users will not like dialogs popping up randomly over their
> >>> applications, and it exposes confidential jobs to interception by
> >>> the user at the computer when the job prints.
> >>>
> >>> --
> >>> ______________________________________________________________________
> >>> Michael R Sweet                        Senior Printing System Engineer
> >>>
> >> Michael,
> >>
> >> I am trying the way registed with launchd.
> >>
> >> LaunchService document does not help me to write the code.
> >>
> >> Is there any sample code about LaunchService?
> >>
> >> or could you please tell me the APIs that I should use in my cases?
> >>
> >> Thanks very much.
> >> Keene
> > Finally I find the correct document
> > http://developer.apple.com/documentation/MacOSX/Conceptual/BPSystemStartup/BPSystemStartup.html
> >
> > What I need to do is make Launch Agent, which is per user-session, and has the ability to access window server.
> >
> > The Launch Agent will be started when user login, and it will be running on backend and listen on the TCP port I specified. If the defined command received, agent will display the window and bring it to the topmost. CUPS filter driver will send the command.
> >
> > I have to programming for the IPC between agent and filter.
> >
> > Am I correct?
>
> Basically, yes.  The only change I would make would be to use a UNIX
> domain socket instead of a TCP socket, then you can easily tie the
> launch agent to a particular print queue.
>
> --
> ______________________________________________________________________
> Michael R Sweet                        Senior Printing System Engineer
>
Hi Michael,

I will use UDS, but I have no idea how to tie the agent to print queue.

Could you please give me more advice about how to tie?

Thanks
Keene