ParamBlockHeader

#include <Files.h>

#define ParamBlockHeader Size Offset Description

QElemPtr qLink; 4 0 queue link in header

short qType; 2 4 type byte for safety check

short ioTrap; 2 6 FS: the Trap

Ptr ioCmdAddr; 4 8 FS: the address to dispatch to

ProcPtr ioCompletion; 4 12 completion routine or NIL

OSErr ioResult; 2 16 result code

StringPtr ioNamePtr; 4 18 ptr to Vol:Filename string

short ioVRefNum; 2 22 volume refnum (drvNum for Eject

and MountVol)

24 (size of aggregate)

Notes: ParamBlockHeader is a # define'd macro that defines the fields that are

shared by many of the parameter block types used by the low level calls

such as those used by the File Manager and the Device Manager. These

fields are placed in the beginning of every parameter block that has

ParamBlockHeader as its first field.

Referenced by (42):