[Contents] [Index] [Help] [Retrace] [Browse <] [Browse >]

	Read -- Read bytes of data from a file

	actualLength = Read( file, buffer, length )
	D0		     D1    D2	   D3

	LONG Read(BPTR, void *, LONG)

	Data can be copied using a combination of Read() and Write().
	Read() reads bytes of information from an opened file (represented
	here by the argument 'file') into the buffer given. The argument
	'length' is the length of the buffer given.

	The value returned is the length of the information actually read.
	So, when 'actualLength' is greater than zero, the value of
	'actualLength' is the the number of characters read. Usually Read
	will try to fill up your buffer before returning. A value of zero
	means that end-of-file has been reached. Errors are indicated by a
	value of -1.

	Note: this is an unbuffered routine (the request is passed directly
	to the filesystem.)  Buffered I/O is more efficient for small
	reads and writes; see FGetC().

	file - BCPL pointer to a file handle
	buffer - pointer to buffer
	length - integer

	actualLength - integer

	Open(), Close(), Write(), Seek(), FGetC()

[Back to Amiga Developer Docs]