Inside Macintosh: Files /

Chapter 2 - File Manager / File Manager Reference

Low-Level Volume Access Routines / Manipulating the Default Volume

PBSetVol

You can change the default volume and default directory using the PBSetVol function.

FUNCTION PBSetVol (paramBlock: ParmBlkPtr; async: Boolean): OSErr;

paramBlock

A pointer to a basic File Manager parameter block.

async

A Boolean value that specifies asynchronous (TRUE) or synchronous (FALSE) execution.

-->	ioCompletion	ProcPtr	A pointer to a completion routine.
<--	ioResult	OSErr	The result code of the function.
-->	ioNamePtr	StringPtr	A pointer to a pathname.
-->	ioVRefNum	Integer	A volume reference number or a working directory reference number.

DESCRIPTION

If you pass a volume reference number in ioVRefNum, the PBSetVol function makes the specified volume the default volume and the root directory of that volume the default directory. If you pass a working directory reference number, PBSetVol makes the specified directory the default directory, and the volume containing that directory
the default volume.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro for PBSetVol is _SetVol.

RESULT CODES

noErr	0	No error
nsvErr	-35	No such volume
bdNamErr	-37	Bad volume name
paramErr	-50	No default volume