• NAME
• SYNOPSIS
• DESCRIPTION
• CONSTRUCTOR
• METHODS
• NOTE
• SEE ALSO
• BUGS
• HISTORY

NAME

SYNOPSIS

    use IO::Handle;

    $fh = new IO::Handle;
    if ($fh->fdopen(fileno(STDIN),"r")) {
        print $fh->getline;
        $fh->close;
    }

    $fh = new IO::Handle;
    if ($fh->fdopen(fileno(STDOUT),"w")) {
        $fh->print("Some text\n");
    }

    $fh->setvbuf($buffer_var, _IOLBF, 1024);

    undef $fh;       # automatically closes the file if it's open

    autoflush STDOUT 1;

DESCRIPTION

If you are reading this documentation, looking for a replacement for the FileHandle package, then I suggest you read the documentation for IO::File

A IO::Handle object is a reference to a symbol (see the Symbol package)

CONSTRUCTOR

new ()

Creates a new IO::Handle object.

new_from_fd ( FD, MODE )

Creates a IO::Handle like new does. It requires two parameters, which are passed to the method fdopen; if the fdopen fails, the object is destroyed. Otherwise, it is returned to the caller.

METHODS

See the perlfunc manpage for complete descriptions of each of the following supported IO::Handle methods, which are just front ends for the corresponding built-in functions:

    close
    fileno
    getc
    eof
    read
    truncate
    stat
    print
    printf
    sysread
    syswrite

See the perlvar manpage for complete descriptions of each of the following supported IO::Handle methods:

    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
    format_write

Furthermore, for doing normal I/O you might need these:

$fh->getline

This works like <$fh> described in I/O Operators except that it's more readable and can be safely called in an array context but still returns just one line.

$fh->getlines

This works like <$fh> when called in an array context to read all the remaining lines in a file, except that it's more readable. It will also croak if accidentally called in a scalar context.

$fh->fdopen ( FD, MODE )

fdopen is like an ordinary open except that its first parameter is not a filename but rather a file handle name, a IO::Handle object, or a file descriptor number.

$fh->write ( BUF, LEN [, OFFSET }\] )

write is like write found in C, that is it is the opposite of read. The wrapper for the perl write function is called format_write.

$fh->opened

Returns true if the object is currently a valid file descriptor.

$fh->untaint

Marks the object as taint-clean, and as such data read from it will also be considered taint-clean. Note that this is a very trusting action to take, and appropriate consideration for the data source and potential vulnerability should be kept in mind.

NOTE

SEE ALSO

BUGS

HISTORY