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.\" ========================================================================
.\"
.IX Title "FileHandle 3"
.TH FileHandle 3 "2012-09-11" "perl v5.12.5" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
FileHandle \- supply object methods for filehandles
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use FileHandle;
\&
\&    $fh = FileHandle\->new;
\&    if ($fh\->open("< file")) {
\&        print <$fh>;
\&        $fh\->close;
\&    }
\&
\&    $fh = FileHandle\->new("> FOO");
\&    if (defined $fh) {
\&        print $fh "bar\en";
\&        $fh\->close;
\&    }
\&
\&    $fh = FileHandle\->new("file", "r");
\&    if (defined $fh) {
\&        print <$fh>;
\&        undef $fh;       # automatically closes the file
\&    }
\&
\&    $fh = FileHandle\->new("file", O_WRONLY|O_APPEND);
\&    if (defined $fh) {
\&        print $fh "corge\en";
\&        undef $fh;       # automatically closes the file
\&    }
\&
\&    $pos = $fh\->getpos;
\&    $fh\->setpos($pos);
\&
\&    $fh\->setvbuf($buffer_var, _IOLBF, 1024);
\&
\&    ($readfh, $writefh) = FileHandle::pipe;
\&
\&    autoflush STDOUT 1;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1NOTE:\s0 This class is now a front-end to the IO::* classes.
.PP
\&\f(CW\*(C`FileHandle::new\*(C'\fR creates a \f(CW\*(C`FileHandle\*(C'\fR, which is a reference to a
newly created symbol (see the \f(CW\*(C`Symbol\*(C'\fR package).  If it receives any
parameters, they are passed to \f(CW\*(C`FileHandle::open\*(C'\fR; if the open fails,
the \f(CW\*(C`FileHandle\*(C'\fR object is destroyed.  Otherwise, it is returned to
the caller.
.PP
\&\f(CW\*(C`FileHandle::new_from_fd\*(C'\fR creates a \f(CW\*(C`FileHandle\*(C'\fR like \f(CW\*(C`new\*(C'\fR does.
It requires two parameters, which are passed to \f(CW\*(C`FileHandle::fdopen\*(C'\fR;
if the fdopen fails, the \f(CW\*(C`FileHandle\*(C'\fR object is destroyed.
Otherwise, it is returned to the caller.
.PP
\&\f(CW\*(C`FileHandle::open\*(C'\fR accepts one parameter or two.  With one parameter,
it is just a front end for the built-in \f(CW\*(C`open\*(C'\fR function.  With two
parameters, the first parameter is a filename that may include
whitespace or other special characters, and the second parameter is
the open mode, optionally followed by a file permission value.
.PP
If \f(CW\*(C`FileHandle::open\*(C'\fR receives a Perl mode string (\*(L">\*(R", \*(L"+<\*(R", etc.)
or a \s-1POSIX\s0 \fIfopen()\fR mode string (\*(L"w\*(R", \*(L"r+\*(R", etc.), it uses the basic
Perl \f(CW\*(C`open\*(C'\fR operator.
.PP
If \f(CW\*(C`FileHandle::open\*(C'\fR is given a numeric mode, it passes that mode
and the optional permissions value to the Perl \f(CW\*(C`sysopen\*(C'\fR operator.
For convenience, \f(CW\*(C`FileHandle::import\*(C'\fR tries to import the O_XXX
constants from the Fcntl module.  If dynamic loading is not available,
this may fail, but the rest of FileHandle will still work.
.PP
\&\f(CW\*(C`FileHandle::fdopen\*(C'\fR is like \f(CW\*(C`open\*(C'\fR except that its first parameter
is not a filename but rather a file handle name, a FileHandle object,
or a file descriptor number.
.PP
If the C functions \fIfgetpos()\fR and \fIfsetpos()\fR are available, then
\&\f(CW\*(C`FileHandle::getpos\*(C'\fR returns an opaque value that represents the
current position of the FileHandle, and \f(CW\*(C`FileHandle::setpos\*(C'\fR uses
that value to return to a previously visited position.
.PP
If the C function \fIsetvbuf()\fR is available, then \f(CW\*(C`FileHandle::setvbuf\*(C'\fR
sets the buffering policy for the FileHandle.  The calling sequence
for the Perl function is the same as its C counterpart, including the
macros \f(CW\*(C`_IOFBF\*(C'\fR, \f(CW\*(C`_IOLBF\*(C'\fR, and \f(CW\*(C`_IONBF\*(C'\fR, except that the buffer
parameter specifies a scalar variable to use as a buffer.  \s-1WARNING:\s0 A
variable used as a buffer by \f(CW\*(C`FileHandle::setvbuf\*(C'\fR must not be
modified in any way until the FileHandle is closed or until
\&\f(CW\*(C`FileHandle::setvbuf\*(C'\fR is called again, or memory corruption may
result!
.PP
See perlfunc for complete descriptions of each of the following
supported \f(CW\*(C`FileHandle\*(C'\fR methods, which are just front ends for the
corresponding built-in functions:
.PP
.Vb 8
\&    close
\&    fileno
\&    getc
\&    gets
\&    eof
\&    clearerr
\&    seek
\&    tell
.Ve
.PP
See perlvar for complete descriptions of each of the following
supported \f(CW\*(C`FileHandle\*(C'\fR methods:
.PP
.Vb 12
\&    autoflush
\&    output_field_separator
\&    output_record_separator
\&    input_record_separator
\&    input_line_number
\&    format_page_number
\&    format_lines_per_page
\&    format_lines_left
\&    format_name
\&    format_top_name
\&    format_line_break_characters
\&    format_formfeed
.Ve
.PP
Furthermore, for doing normal I/O you might need these:
.ie n .IP "$fh\->print" 4
.el .IP "\f(CW$fh\fR\->print" 4
.IX Item "$fh->print"
See \*(L"print\*(R" in perlfunc.
.ie n .IP "$fh\->printf" 4
.el .IP "\f(CW$fh\fR\->printf" 4
.IX Item "$fh->printf"
See \*(L"printf\*(R" in perlfunc.
.ie n .IP "$fh\->getline" 4
.el .IP "\f(CW$fh\fR\->getline" 4
.IX Item "$fh->getline"
This works like <$fh> described in \*(L"I/O Operators\*(R" in perlop
except that it's more readable and can be safely called in a
list context but still returns just one line.
.ie n .IP "$fh\->getlines" 4
.el .IP "\f(CW$fh\fR\->getlines" 4
.IX Item "$fh->getlines"
This works like <$fh> when called in a list context to
read all the remaining lines in a file, except that it's more readable.
It will also \fIcroak()\fR if accidentally called in a scalar context.
.PP
There are many other functions available since FileHandle is descended
from IO::File, IO::Seekable, and IO::Handle.  Please see those
respective pages for documentation on more functions.

.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	runtime/perl-512
=
Stability	Uncommitted
.TE 
.PP
.SH "SEE ALSO"
.IX Header "SEE ALSO"
The \fB\s-1IO\s0\fR extension,
perlfunc, 
\&\*(L"I/O Operators\*(R" in perlop.


.SH NOTES

.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.cpan.org/src/5.0/perl-5.12.5.tar.bz2

Further information about this software can be found on the open source community website at http://www.perl.org/.