Autodocs
Devices:
printer.device
--background--
CMD_FLUSH
CMD_INVALID
CMD_RESET
CMD_START
CMD_STOP
CMD_WRITE
CallErrHook
PBothReady
PQuery
PRD_DUMPRPORT
PRD_DUMPRPORTTAGS
PRD_EDITPREFS
PRD_PRTCOMMAND
PRD_QUERY
PRD_RAWWRITE
PRD_READPREFS
PRD_SETERRHOOK
PRD_WRITEPREFS
PRead
PWrite
Include
GuruMeditation
|
Docs » Autodocs » printer.device » PRD_READPREFS
PRD_READPREFS - read the current driver preferences in a buffer (V44)
This is a non standard read command that reads the driver
preferences.
IO REQUEST
io_Message mn_ReplyPort set if quick I/O is not possible
io_Command PRD_READPREFS
io_Flags IOB_QUICK set if quick I/O is possible
io_Length the size of the buffer in io_Data
io_Data a buffer
io_Actual the number of bytes copied to the buffer.
If the read fails because the buffer is too small you should double
the size of the buffer and try it again.
Never interpret the contents of the buffer. You are allowed to save
it to file (as one block of data) and of course to write it back to
the driver (PRD_WRITEPREFS).
If you close the printer device between PRD_EDITPREFS and the
actual printing (CMD_WRITE or PRD_DUMPRPORTTAGS) you must read
the prefs after PRD_EDITPREFS and write it back before printing
or the driver may forget the user changes.
|
