Inside Macintosh: Files /

Chapter 2 - File Manager / File Manager Reference

Low-Level File Access Routines / Reading, Writing, and Closing Files

PBClose

You can use the PBClose function to close an open file.

FUNCTION PBClose (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.

DESCRIPTION

The PBClose function writes the contents of the access path buffer specified by the ioRefNum field to the volume and removes the access path.

WARNING

Some information stored on the volume won't be updated until PBFlushVol is called.

WARNING

Do not call PBClose with a file reference number of a file that has already been closed. Attempting to close the same file twice may result in loss of data on a volume. See "File Control Blocks" on page 2-81 for a description of how this can happen.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro for PBClose is _Close.

RESULT CODES

noErr	0	No error
ioErr	-36	I/O error
fnOpnErr	-38	File not open
fnfErr	-43	File not found
rfNumErr	-51	Bad reference number