binmode() - Opening Files for Binary Input

Perl Tutorials - Herong's Tutorial Examples

∟Open Files in Binary Mode

∟binmode() - Opening Files for Binary Input

This section describes steps on how to open file for binary input using open(), binmode() and read() functions.

If you want to open a file and read its content in binary mode, you should use the following functions:

open() to open the file to a file handle.
binmode() to set the file handle to binary mode.
read() to read data from the file handle.
close() to close the file handle.

Descriptions and sample codes of open() and close() are in the previous chapter.

The syntax of binmode() is very simple:

   binmode(file_handle);

The syntax of read() is more complex:

rc = read(file_handle, buffer, length, offset);
rc = read(file_handle, buffer, length);

where "buffer" is a scalar variable where the inputted bytes will be stored; "length" is the number of bytes requested to be inputted; "rc" is the actual number of bytes inputted; "offset" is an optional value to specify where in the scalar variable to begin to store the inputted bytes.

Table of Contents

About This Book

Perl on Linux Systems

ActivePerl on Windows Systems

Data Types: Values and Variables

Expressions, Operations and Simple Statements

User Defined Subroutines

Perl Built-in Debugger

Name Spaces and Perl Module Files

Symbolic (or Soft) References

Hard References - Addresses of Memory Objects

Objects (or References) and Classes (or Packages)

Typeglob and Importing Identifiers from Other Packages

String Built-in Functions and Performance

File Handles and Data Input/Output

►Open Files in Binary Mode

►binmode() - Opening Files for Binary Input

binmode() - Opening Files for Binary Output

Copy.pl - Copying Binary Files

Bin2Hex.pl - Converting Binary Data to Hex Numbers

Open Directories and Read File Names

File System Functions and Operations

Image and Picture Processing

Using DBM Database Files

Using MySQL Database Server

Socket Communication Over the Internet

XML::Simple Module - XML Parser and Generator

XML Communication Model

SOAP::Lite - SOAP Server-Client Communication Module

Perl Programs as IIS Server CGI Scripts

CGI (Common Gateway Interface)

XML-RPC - Remote Procedure Call with XML and HTTP

RPC::XML - Perl Implementation of XML-RPC

Integrating Perl with Apache Web Server

CGI.pm Module for Building Web Pages

LWP::UserAgent and Web Site Testing

Converting Perl Script to Executable Binary

Managing Perl Engine and Modules on macOS

Archived Tutorials

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