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Getting Started with Lazarus IDE

Chapter 1. Installing and Configuring the Lazarus Development Environment

In this chapter, we will begin learning about the Lazarus IDE for Free Pascal by installing and configuring Lazarus. We will learn the following:

Why use Lazarus
How to install Lazarus on a Linux platform
How to install Lazarus on a Windows platform
How to install Lazarus on Mac OS
How to install Lazarus on FreeBSD
How to create a basic configuration for Lazarus

Installing Lazarus in Linux

The Lazarus IDE is available as binary packages for Linux in the Red Hat Package Management (RPM) format, Debian (DEB) format, or in tar gzip format. These packages are available for 32-bit or 64-bit distributions of Linux. Certain distributions of Linux, such as Ubuntu, make Lazarus available through their custom package managers. For information on installing Lazarus using such package management software, check the instructions available from the distribution's website or manuals.

Downloading and installing the Lazarus Linux RPM package

The Lazarus binary RPM package is available from the Lazarus SourceForge.net (http://sourceforge.net/projects/lazarus/files/) download area. Once you have accessed this page, choose the correct link for your platform package, in this case either Lazarus Linux x86_64 RPM for 64-bit platforms or Lazarus Linux i386 RPM for 32-bit platforms. We will be using the 32-bit package for this example. After clicking on the correct link, choose the current release link, in this case Lazarus 1.0.2. Once you are in this area, all the packages needed to install Lazarus are available to be downloaded. Download the following packages:

Lazarus-1.0.2-1.i386.rpm
fpc-src-2.6.0-0.laz.i686.rpm
fpc-2.6.0-0.laz.i686.rpm

Also available is the optional package, fpc-debuginfo-2.6.0-0.laz.i686.rpm, which provides debug information for the system units. This is only needed if you want to do development for Free Pascal itself, which is beyond the scope of this book.

Requirements

Before installing Free Pascal and Lazarus, the following programs are required on the Linux system:

GNU as the GNU assembler
GNU Id or the GNU linker

GNU Make, this is optional but recommended for easy recompiling of the FPC compiler and Run-Time Library (RTL).

Lazarus requires the following libraries:

GTK+ 2.x or Qt: Most Linux distributions already install GTK+ 2.x. You can also download the libraries from http://www.gtk.org. Qt is also supported by most distributions and is installed together with KDE.

To begin the installation of Lazarus, log into your system as a root user. First install the Free Pascal for the Lazarus package containing the following command:

# rpm -UvH fpc-2.6.0-0.laz.i686.rpm

After the successful completion of this package, next we will need to install the Free Pascal source code package. The Free Pascal source code package is required to operate certain functions in Lazarus. If the IDE cannot find the Free Pascal source, the user will be presented with a warning box with the following message:

The Free Pascal source was not found. Some functions will not work.

To install the Free Pascal source, use the following command:

# rpm -UvH fpc-src-2.6.0-0.laz.i686.rpm

After the successful completion of the installation of the Free Pascal source, all that is left to do is to install the Lazarus IDE itself with the following command:

# rpm -UvH Lazarus-1.0-1.i386.rpm

With the successful completion of these three packages, you are ready to use the Lazarus IDE. Under the GNOME desktop, Lazarus can be accessed from the Applications menu under the Programming submenu.

Downloading and installing the Lazarus Linux DEB package

For Debian-based Linux distributions, the SourceForge.net Lazarus repository contains Debian packages for 32-bit and 64-bit distributions. Access the SourceForge.net repository at http://sourceforge.net/projects/lazarus/files/. For 32-bit Debian-based distributions, choose the Lazarus Linux i386 DEB subfolder. For 64-bit Debian-based distributions, choose the Lazarus Linux amd64 DEB subfolder. Next, choose the current Lazarus release, which at the time of writing is Lazarus 1.0.2. Download all the Debian packages within this folder.

For 32-bit systems:

lazarus_1.0.2-0_i386.deb
fpc-src_2.6.0-120824_i386.deb
fpc_2.6.0-120824_i386.deb

For 64-bit systems:

lazarus_1.0.2-0_amd64.deb
fpc-src_2.6.0-120824_amd64.deb
fpc_2.6.0-120824_amd64.deb

Once the packages are downloaded, install them using the following command:

dpkg -i <package_name>

Install each of the packages for Free Pascal, Free Pascal Source, and the Lazarus IDE.

Lazarus for Ubuntu

There is an Ubuntu repository available at http://www.hu.freepascal.org that contains Lazarus and FPC debs. This repository can be used with apt-get. Before using this repository with apt-get, it first needs to be added to the apt.

First, we need to add the repository's gpg key to the apt keys with the following commands as a root user:

# gpg –keyserver hkp://pgp.mit.edu:11371 –recv-keys 6A11800F
# gpg -a –export 6A11800F | apt-key add -

Next, add the repository by editing /etc/apt/sources.list, adding the following line:

deb http://www.hu.freepascal.org/lazarus/lazarus-stable universe

Once the repository is added to the list of available repositories, Lazarus can be installed with the following commands, again as root:

# apt-get update
# apt-get install lazarus

Installing under other OSes such as FreeBSD or Mac OS X

Although Lazarus is targeted mainly for Linux and Windows operating systems, there are also binary packages available for Mac OS X. FreeBSD makes Free Pascal and Lazarus available through its ports collections. It is also possible to run Lazarus on other operating systems, such as Haiku, by compiling Lazarus and Free Pascal from source.

Installing Lazarus on Mac OS X

Lazarus and Free Pascal are available as disk images (.dmg files) for Mac OS X for Intel-based Macs and PowerPC-based Macs from the SourceForge.net Repository at http://sourceforge.net/projects/lazarus/files/. The Mac OS X versions of Lazarus require the installation of Apple Developer Tools. This can be installed from the Mac OS X installation disks or downloaded from the Apple Developers Connection (ADC) at http://developer.apple.com. ADC requires registration, which is free. Once these tools have been installed, go to the SourceForge.net repository and select the correct subfolder for your Mac, Lazarus Mac OS X PowerPC, or Lazarus Mac OS X i386. Then choose the latest release of the Lazarus subfolder, which is Lazarus 1.0.2 at the time of writing, and download the disk images. For Mac OS X PowerPC, download the following:

fpcsrc-2.6.0.powerpc-macosx.dmg
fpc-2.6.0.powerpc-macosx.dmg
lazarus-1.0.2-powerpc-macosx.dmg

For Mac OS X Intel:

fpcsrc-2.6.0.powerpc-macosx.dmg
fpc-2.6.0.powerpc-macosx.dmg
lazarus-1.0.2-20121009-i386-macosx.dmg

Once the disk image files are downloaded, install them in the following order:

fpc: The Free Pascal compiler
fpcsrc: The Free Pascal compiler source
lazarus: The Lazarus IDE

After installation, the Lazarus application can be found in /Developer/lazarus, the Free Pascal source files are in /usr/local/share/fpcsrc.

Installing under FreeBSD

The FreeBSD ports collection contains, at the time of writing, 91 separate ports for Free Pascal. These ports are divided into subcategories such as graphics, math, and multimedia. This is in keeping with the FreeBSD philosophy of only installing necessary packages to keep this system as small as possible and easily maintainable. For Lazarus, the ports collection contains six separate ports; among them are GTK+, GTK2+, and Qt toolkit versions of Lazarus. The simplest way to install Free Pascal is to log in as a root user and issue the following commands:

# cd /usr/ports/lang/fpc
# make install clean

This will install the Free Pascal meta port. Meta port in FreeBSD is a port that installs multiple sub ports. In this case, the fpc meta port will install all 91 Free Pascal port. In addition to these ports, any requirements not installed on the system will also be automatically installed. If you are an advanced FreeBSD user and know exactly the type of development you are going to do with Lazarus and Free Pascal, you can install only the needed individual ports of the 91 available.

The easiest way to install Lazarus is to use the meta port located in /usr/ports/editors/lazarus. Remain logged in as root and issue the following commands:

# cd /usr/ports/editors/lazarus
# make config

This will bring up the Options for Lazarus dialog box as seen in the screenshot that follows. In this dialog, you can choose to either install the GTK2 interface or the QT4 interface for the IDE. You can only choose one of the two options, choosing both will cause an error during installation.

After selecting the desired interface and selecting OK, continue installing by issuing the following command:

# make install clean

Once the installation is complete, Lazarus will be installed in /usr/local/bin and can be started with the following command:

$ /usr/local/bin/startlazarus

For operating systems that don't have a binary package available, Lazarus can be built using the source code.

Installing from source

Lazarus and Free Pascal source code is available through Subversion (SVN). The SVN repositories provide the most up-to-date source code available. The SVN repositories also allow you to track only the changes in the source. Although, SVN access requires an Internet connection, it does not require the user to be root.

When downloading the source, you need to make sure that you have enough free space. The initial checkout requires approximately 270 MB of free space. To begin the installation from source, first make sure that current working folder is the folder that you want the source code to be present in. For the initial checkout, use the following command:

$ svn checkout http://svn.freepascal.org/svn/lazarus/trunk/ lazarus

This will download the latest available source code to the lazarus subfolder, which will be created in the current folder. Once the download is completed, compile the source code by using the following command:

$ cd lazarus
$ make

Once the build is complete, Lazarus can be started from the current folder with the following command:

$ ./startlazarus

To keep Lazarus up-to-date, from the parent folder of the Lazarus source code, use the following commands:

$ svn update lazarus
$ cd lazarus
$ make clean all

This will rebuild the Lazarus IDE without packages. After the build is done, then use the following command to link to the existing Lazarus packages:

$ ./lazbuild –build-ide=

Tip

If you are building from source on a BSD-based system, you will need to use gmake instead of make.

On the Windows platform, if you have Delphi installed, you must modify your PATH variable or delete the Delphi version of make.

Key benefits

Creating new projects

Create components for use in Lazarus

Documenting Lazarus project

Description

A good integrated development environment can be the key to creating and delivering software on time and budget. Having a programming language and a development environment that runs on multiple platforms greatly eases and lessens the time taken on creating cross-platform applications. An IDE that is compatible with a legacy code base allows developers to leverage existing libraries in future applications."Getting Started with Lazarus" is a practical, hands-on guide that provides you with a number of clear step-by-step exercises, which will help you take advantage of the power of the Lazarus IDE and Free Pascal to develop software that can be created for cross-platform use."Getting started with Lazarus" discusses developing software with the open source cross platform integrated development environment and the Free Pascal language. We'll learn how to install Lazarus on various platforms such as Linux and Windows, as well as how to create new projects and convert existing Delphi projects to Lazarus projects by learning the differences between Delphi's Pascal syntax and Free Pascal's Object Pascal using a real world example project. We'll learn how to create custom components for use in Lazarus. We'll also learn the basics of documenting a Lazarus project using the Lazarus Documentation Editor. Finally we will learn that the IDE can be rebuilt using a different widget type, specifically GTK 2. Teach yourself the basics of programming with Lazarus and the open source IDE for the Free Pascal language.

Who is this book for?

This book is geared toward developers that have a familiarity with Delphi or Free Pascal and would like to start using the open source Lazarus Integrated Development Environment. You should have knowledge of creating a console and GUI applications as well as creating basic components. Example source code and projects are provided to help learn the differences between Delphi and Lazarus projects.

What you will learn

Install Lazarus on different platforms such as Linux or Windows

Learn the basics of the Lazarus IDE such as the menus, the Object Inspector, and the Source Code Editor

Create new projects with Lazarus such as console applications and GUI applications

Debug Lazarus projects

Convert an existing Delphi project to a Lazarus project

Create new components for use with Lazarus GUI applications

Document a Lazarus project using the LazDE tool

Rebuild Lazarus on the Windows platform using the GTK 2 widget set

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Dave Apr 18, 2017

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buchi Feb 23, 2014

DelphiソフトをLazarusに変換する方法や、コンポーネントの作成方法など一般的なGUIソフト作成手順の解説を超えた実践的な記述が読める貴重な本。

James B. Jun 01, 2014

Generally, it was a pretty good introduction to Lazarus and object pascal. The author, Person, didn't say much about the problems that you might encounter with the Mac or Linux, but he did say that Windows was his primary OS. This book will get the reader headed in right direction.

Barry Finch Mar 15, 2018

Just bought this for 6p, plus £3.50 postage from the USA. Yes 6p! It was secondhand, but you wouldn't know it to look at it.I only unwrapped it five minutes ago so this is a first impression review. It's a fairly short book that runs to 101 pages including five pages of index.The Menkaura Abiola-Ellison book 'Getting Started with Lazarus and Free Pascal' runs to 371 pages with only three and a bit pages of index and the James Powell book 'A Beginner's guide to Programming with the Lazarus IDE' has 58 pages and no index.A quick check (small sample size admittedly) on this book's index confirmed that the index did in fact direct me to the correct page, unlike Mr Abiola-Ellison's book which seems to have used a random number generator for creating its index. There were some things that didn't appear in the index, but better that than having grossly wrong entries.One thing I spotted almost immediately was a section covering how to convert your old Delphi programs to run under Lazarus. It was worth the 6p plus postage (many times over) for that alone. It covers Lazarus's built in tools for doing the conversion and also goes into some detail on how to do it by hand.My first impression was going to be five stars. However I couldn't find any reference to variables so I've knocked it down to four stars. I may well update my review once I've had time for deeper analysis.

PDHCentral Nov 04, 2019

Expected a bit more... Good for beginners but its content is a little bare, focusing more on setting up your environment rather than the programming language itself.

Getting Started with Lazarus IDE: Get to grips with the basics of programming, debugging, creating, and documenting projects with the Lazarus IDE

What do you get with Print?

Getting Started with Lazarus IDE

Chapter 1. Installing and Configuring the Lazarus Development Environment

Why Lazarus?

Installing Lazarus in Linux

Downloading and installing the Lazarus Linux RPM package

Requirements

Downloading and installing the Lazarus Linux DEB package

Lazarus for Ubuntu

Installing under Windows

Installing under other OSes such as FreeBSD or Mac OS X

Installing Lazarus on Mac OS X

Installing under FreeBSD

Installing from source

Tip

Configuring the Lazarus development environment

Summary

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