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Inside Macintosh: Files /
Chapter 2 - File Manager / File Manager Reference
High-Level Volume Access Routines / Obtaining Volume Information

GetVRefNum

You can use the GetVRefNum function to get a volume reference number from a file reference number.

FUNCTION GetVRefNum (refNum: Integer; VAR vRefNum: Integer): 
                     OSErr;
refNum
The file reference number of an open file.
vRefNum
On exit, the volume reference number of the volume containing the file specified by refNum.
DESCRIPTION
The GetVRefNum function returns the volume reference number of the volume containing the specified file. If you also want to determine the directory ID of the specified file's parent directory, call the PBGetFCBInfo function.

RESULT CODES
noErr0No error
rfNumErr-51Bad reference number
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© Apple Computer, Inc.
2 JUL 1996