rc (ULONG) - returns

Return codes.
• Success

• 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 command sequence.
  87(ERROR_INVALID_PARAMETER)
  An invalid buffer was given.
  253(ERROR_INVALID_PATH)
  Invalid channel requested.
  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.
  0x4013(PMERR_SPL_JOB_PRINTING)
  A job is being sent to the printer, the printer cannot accept commands while receiving job data, and FLG_MUSTCOMPLETE is clear.
  0x403D(PMERR_SPL_CNV_NOT_INIT)
  The protocol converter or port driver has not been initialized for this port.

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