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:

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

The syntax of binmode() is very simple:


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 - Copying Binary Files - Converting Binary Data to Hex Numbers

 Open Directories and Read File Names

 File System Functions and Operations

 Converting Perl Script to Executable Binary

 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 Module for Building Web Pages

 LWP::UserAgent and Web Site Testing


 PDF Printing Version