OpenDF

Create an access path to the data fork of a file

#include <Files.h> File Manager

OSErr OpenDF( filename, vRefNum , refNum);

Str255 filename name of the file to open

short vRefNum; a volume or working directory reference number

short *refNum ; points to a path reference number

returns Error Code; 0=no error

OpenDF creates an access path to the data fork of a file. It is almost identical

filename name of the file to open

vRefNum a volume or working directory reference number

refNum points to a path reference number

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

noErr (0) No error

bdNamErr (-37) Bad name

extFSErr (-58) External file system

ioErr (-36) I/O error

nsvErr (-35) No such volume

opWrErr (-49) File already open for writing

tmfoErr (-42) Too many files open

Notes: The difference between OpenDF and FSOpen is that FSOpen can open both

files and devices, but OpenDF can open only files. Using OpenDF instead of

FSOpen when your application is opening a file prevents naming conflicts

or ambiguities and ensures that your application can open files whose names

start with a period (.)

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