Inside Macintosh: Files /

Chapter 2 - File Manager / File Manager Reference

High-Level File Access Routines / Manipulating the File Mark

GetFPos

You can use the GetFPos function to determine the current position of the mark before reading from or writing to an open file.

FUNCTION GetFPos (refNum: Integer; VAR filePos: LongInt): OSErr;

refNum

The file reference number of an open file.

filePos

On output, the current position of the mark.

DESCRIPTION

The GetFPos function returns, in the filePos parameter, the current position of the file mark for the specified open file. The position value is zero-based; that is, the value of filePos is 0 if the file mark is positioned at the beginning of the file.

RESULT CODES

noErr	0	No error
ioErr	-36	I/O error
fnOpnErr	-38	File not open
rfNumErr	-51	Bad reference number
gfpErr	-52	Error during GetFPos