Reading from a low level file
The
FREAD
(<filehandle>,<numbytes>)
function reads <numbytes> characters from the file. It starts reading
from the current position in the file and moves its pointer
<numbytes> characters along the file time each time that you call
this function. If you ask it to read more bytes than there are in the file
then it will return all the bytes available and move the pointer beyond
the end of the file. No error will be raised when this happens but you can
call the FEOF() function to test whether
you have passed the end of the file.
This example reads groups of 10 bytes from a text file and prints them out.
lnFileHandle=
FOPEN("file.txt")
DO WHILE NOT FEOF(lnFileHandle)
?FREAD(lnFileHandle, 10)
ENDDO
FCLOSE(lnFileHandle)
The FREAD() function treats all characters
in the same way. It ignores the special meaning of ASCII characters 10 and
13 (LineFeed and CarriageReturn) and counts them as individual characters.
Another low level function, FGETS() will read
complete lines of characters and is much more suitable for processing text
files.
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