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8.112. FileHandle
Provides
object methods for working with filehandles. Provides the following
methods.
| new |
$fh = new FileHandle [filename[, mode]]
Constructor. Creates a FileHandle, which is a reference to a newly
created symbol. The optional parameters,
filename and
mode, are passed to
open. The FileHandle object is returned if the
open succeeds; otherwise, it is destroyed.
| new_from_fd |
$fh = new_from_fd FileHandle fd, mode
Constructor. Creates a FileHandle, but it takes the file descriptor,
fd, instead of
filename as a parameter, along with
mode; the parameters are required.
| fdopen |
$fh->fdopen fdname [openmode]
Like open, except that its first parameter is not
a filename but a filehandle name, a FileHandle object, or a file
descriptor number.
| getpos |
$pos = $fh->getpos
If the C functions fgetpos(3) and
fsetpos(3) are available,
getpos returns the current position,
$pos, of the
FileHandle.
| open |
$fh->open filename [openmode]
Takes filename and, optionally, the open
mode, and opens a file. If the mode is present, it can be in Perl
form (e.g., >, +<) or in
POSIX form (e.g., w, r+).
| setpos |
$fh->setpos pos
Uses the value (pos) returned by
getpos to restore a previous position of the
FileHandle.
| setvbuf |
$fh->setvbuf(params)
Takes the same parameters as the C function
setvbuf(3) and uses the C function to set the
buffering policy for the FileHandle.
The following additional FileHandle methods act as front-ends for the
corresponding built-in Perl functions (see the
O'Reilly book Programming Perl
or the perlfunc manpage for more details):
clearerr | getc |
close | gets |
eof | seek |
fileno | tell |
variables (see Programming Perl or the
perlvar manpage):
autoflush | format_page_number |
format_formfeed | format_top_name |
format_line_break_characters | input_line_number |
format_lines_left | input_record_separator |
format_lines_per_page | output_field_separator |
format_name | output_record_separator |
See Perl's built-in print
function.
$fh->printf
See Perl's built-in printf
function.
$fh->getline
Works like Perl's
<FILEHANDLE> construct, except that it can
be safely called in an array context (but it still returns just one
line).
$fh->getlines
Works like Perl's
<FILEHANDLE> construct when called in an
array context to read all remaining lines in a file.
|  | |
| 8.111. FileCache |  | 8.113. Filter::Simple |
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