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Inside Macintosh: Files /

Chapter 2 - File Manager / File Manager Reference

Low-Level File Access Routines / Manipulating the End-of-File

PBGetEOF

You can use the PBGetEOF function to determine the current logical end-of-file of an open file.

FUNCTION PBGetEOF (paramBlock: ParmBlkPtr; async: Boolean): OSErr;

paramBlock

A pointer to a basic File Manager parameter block.

async

A Boolean value that specifies asynchronous (TRUE) or synchronous (FALSE) execution.

-->	ioCompletion	ProcPtr	A pointer to a completion routine.
<--	ioResult	OSErr	The result code of the function.
-->	ioRefNum	Integer	A file reference number.
<--	ioMisc	Ptr	The logical end-of-file.

DESCRIPTION

The PBGetEOF function returns, in the ioMisc field, the logical end-of-file of the specified file. Because ioMisc is of type Ptr, you'll need to coerce the value to type LongInt to interpret the value correctly.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro for PBGetEOF is _GetEOF.

RESULT CODES

noErr	0	No error
ioErr	-36	I/O error
fnOpnErr	-38	File not open
rfNumErr	-51	Bad reference number
afpAccessDenied	-5000	User does not have the correct access to the file