rc (ULONG) - returns

Return codes.
• Success

• ERROR_INVALID_FUNCTION)
  The command code is not supported. This lack of support may occur if a new command is sent to an old spooler, port driver, or protocol converter.
  2(ERROR_FILE_NOT_FOUND)
  The pszPortName given is not a valid port name configured for this port driver.
  5(ERROR_ACCESS_DENIED)
  Not authorized to access printer port.
  8(ERROR_NOT_ENOUGH_MEMORY)
  Not enough memory to satisfy request.
  29(ERROR_WRITE_FAULT)
  Failure attempting to write to the device. The printer might not have received the set request.
  87(ERROR_INVALID_PARAMETER)
  An invalid parameter was specified; most likely an invalid buffer pointer was given.
  211(ERROR_INFO_NOT_AVAIL)
  The requested information is not available in the protocol converter cache, or the request cannot be sent with the given ulType value. The request should be reissued with a different ulType value.
  640(ERROR_TIMEOUT)
  The set command was not able to be sent to the printer within the time allotted.
  683(ERROR_BIDI_NO_SUPPORT)
  The printer is not in bidirectional mode, therefore query requests are not honored. The port also may be in the process of being shut down.
  0x1403(PMERR_ALREADY_INITIALIZED)
  The port driver has already been initialized for the port.
  0x4005(PMERR_SPL_INV_HSPL)
  Not currently in a passthru session.
  0x4011(PMERR_SPL_INV_JOB_ID)
  The Job ID is not known.
  0x403D(PMERR_SPL_CNV_NOT_INIT)
  The protocol converter or port driver has not been initialized for this port.

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