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Inside Macintosh: Files /

Chapter 2 - File Manager / File Manager Reference

High-Level File Access Routines / Allocating File Blocks

AllocContig

You can use the AllocContig function to allocate additional contiguous blocks to an open file.

FUNCTION AllocContig (refNum: Integer; VAR count: LongInt): OSErr;

refNum

The file reference number of an open file.

count

On input, the number of additional bytes to allocate to the file; on output, the number of bytes allocated, rounded up to the nearest multiple of the allocation block size.

DESCRIPTION

The AllocContig function is identical to the Allocate function except that if there isn't enough contiguous empty space on the volume to satisfy the allocation request, AllocContig does nothing and returns dskFulErr as its function result. If you want to allocate whatever space is available, even when the entire request cannot be filled by the allocation of a contiguous piece, call Allocate instead.

RESULT CODES

noErr	0	No error
dskFulErr	-34	Disk full
ioErr	-36	I/O error
fnOpnErr	-38	File not open
wPrErr	-44	Hardware volume lock
fLckdErr	-45	File is locked
vLckdErr	-46	Software volume lock
rfNumErr	-51	Bad reference number
wrPermErr	-61	Read/write permission doesn't allow writing