GetVRefNum

GetVRefNum Get volume reference number of an open file

#include <Files.h> File Manager

short fRefNum ; file reference; as obtained via FSOpen, etc.

short *vRefNum ; receives volume reference number

returns Error Code; 0=no error

Given the reference number of an open file, GetVRefNum returns the

reference number of the volume on which the file resides.

fRefNum identifies the file whose volume reference you wish to query. This

is normally a value obtained via FSOpen, or SFGetFile, et al.

vRefNum is the address of an unsigned short. Upon return it will contain the

volume reference number of the volume containing the file identified

in fRefNum.

Returns: an operating system Error Code. It will be one of:

noErr (0) No error

rfNumErr (-51) Bad refNum

Notes: You can use the low-level PBGetFCBInfo function to obtain additional

information about any open file.

Referenced by (3):