BIDI_INIT_PROTCNV(Fh) initializes the protocol converter for a port. The spooler passes the BIDI_Q_PORT command structure, returned by the port driver, to the protocol converter using BIDI_INIT_PROTCNV(Fh). The protocol converter should initialize its cache for the given port name.

Note: If a protocol converter or extension is unable to support the printer, it should return ERROR_NOT_SUPPORTED for BIDI_INIT_PROTCNV(Fh).