pOutData (PVOID) - output
Format of buffer depends on ulCommand. For BIDI_READ_PASSTHRU, this will contain BIDI protocol-specific response data and will not be interpreted by the BIDI protocol converter. However, if ulType is TYPE_WITHOUT_WRAPPER, any protocol data wrapper is removed before returning the printer-specific information.
For other commands, see BIDI Command Structures and Command Flow for the structure returned.