Inside Macintosh: More Macintosh Toolbox /

Chapter 1 - Resource Manager / Resource Manager Reference

Resource Manager Routines / Creating an Empty Resource Fork

HCreateResFile

If the FSpCreateResFile procedure is not available, you can use the HCreateResFile procedure to create an empty resource fork.

PROCEDURE HCreateResFile (vRefNum: Integer; dirID: LongInt;
                          fileName: Str255);

vRefNum

The volume reference number of the volume on which the file is located.

dirID

The directory ID of the directory where the file is located.

fileName

The name of the file whose resource fork is to be created.

DESCRIPTION

The HCreateResFile procedure creates a file with an empty resource fork in the directory specified by the vRefNum and dirID parameters. (An empty resource fork contains no resource data but does include a resource map.)

If no other file with the given name exists in the specified directory, HCreateResFile creates a resource file--that is, a resource fork, including a resource map. In this case the file has a zero-length data fork.

If a file with the specified name already exists and includes a resource fork with a resource map, HCreateResFile does nothing. If the data fork of the specified file already exists but the file has a zero-length resource fork, HCreateResFile creates an empty resource fork and resource map for the file.

Before you can work with the newly created file's resource fork, you must first use HOpenResFile or a related function to open it.

SPECIAL CONSIDERATIONS

The HCreateResFile procedure may move or purge memory blocks in the application heap. Your application should not call this procedure at interrupt time.

RESULT CODES

noErr	0	No error
dirFulErr	-33	Directory full
dskFulErr	-34	Disk full
nsvErr	-35	No such volume
ioErr	-36	I/O error
bdNamErr	-37	Bad filename or volume name (perhaps zero length)
tmfoErr	-42	Too many files open
wPrErr	-44	Disk is write-protected
fLckdErr	-45	File is locked

SEE ALSO

To check for errors, call the ResError function as described on page 1-47.

For a description of the HOpenResFile function, see page 1-58.