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Important: The information in this document is obsolete and should not be used for new development.

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

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

Legacy Document

GetFPos

DESCRIPTION

RESULT CODES noErr0No error ioErr-36I/O error fnOpnErr-38File not open rfNumErr-51Bad reference number gfpErr-52Error during GetFPos

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`