Chapter 7 File Manager Functions
fd	File	File descriptor associated with the file.
ofst	int32	New position of the current position mark. The
		position is the number of bytes from the beginning
		of the file, the current position mark, or the end of
		the file, as determined by mode.
mode	int32	Position in the file relative to which FMSeek sets
		the current position mark for a file.
		If mode is fStart, the current position mark
		moves to ofst bytes relative to the start of the file
		(ofst must be greater than or equal to 0).
		If mode is fCurrent, the current position mark
		moves ofst bytes from the current position mark
		(ofst can be positive, 0, or negative).
		If mode is fEnd, the current position mark moves
		to ofst bytes from the end of the file (ofst must be
		less than or equal to 0).

returns		MgErr, which can contain the errors in the following list.
	Error	Description
	mgArgErr	Not a valid file descriptor.
	fEOF	Attempt to seek before the start or after the end of the file.
	fIOErr	Unspecified I/O error occurred.

FMTell

syntax MgErr FMTell(fd, ofstp);

FMTell returns the position of the current position mark in the file.

Parameter	Type	Description
fd	File	File descriptor associated with the file.
ofstp	int32 *	Address at which FMTell stores the position of the
		current position mark, in terms of bytes relative to
		the beginning of the file. If an error occurs, the
		contents of ofstp is undefined.
		See the Pointers as Parameters section of
		Chapter 1, CIN Overview, for more information
		about using this parameter.
returns	MgErr, which can contain the errors in the following list.

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LabVIEW Code Interface Reference Manual