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Lazarus and the Free Pascal Compiler are cross-platform andĬross-architecture development tools. That are frequently no longer available or come with inappropriate Some freeware offerings are bound to or extend proprietary packages Might not be available or represent a considerable conversion challenge.

FREE PASCAL DEFINE TYPE CODE

That the code doesn't have deep dependancies on other packages that Search for "open source licenseĪnother step before starting to work on a conversion is to verify To help clarify how the various types of licenses work and what impact There are also several comparisons available The most flexible for distributing components.

In general, Public Domain (freeware), and the LGPL/MPL are the Original and overly restrictive licensing. Or forgotten component can sometimes inspire authors to revise their If the component is under a restrictive license. Inform the author that their component is being converted. Original author and retain all copyright and licensing headers along When converting components, please respect the wishes of the

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Unwanted or incompatible license on an entire application. Important with components since dropping one on a form can impose an Before converting any package, it's a good idea toĮxamine its licensing and make sure it's going to be compatible with Restrictive versions that prohibit modification, re-distribution andĬommercial use. Licenses for existing code range from freeware/public domain to If you've converted a package or are working on one, please add a note on the Current conversion projects page. To avoid duplicating effort, packages that have already been converted are listed on the Components and Code examples page.

FREE PASCAL DEFINE TYPE SOFTWARE

TurboPower Software has recently released their entireĬommercial offering under the MPL. Please add to it if you know of any other good There is a LOT of code available on the net that can be converted for use with FPC and Lazarus. Selecting a component or library for conversion Where to find code to convert

4.1 Creating a Lazarus package for your component(s).

4 Packaging and Releasing your component.

2.3 Another method to convert a Delphi or Kylix project to Lazarus.

2.2.11.5 You must typecast pointers to actual type when using with var or function of that type.

2.2.11.4 When accessing chars of an indexed string Property of an object, it must be enclosed in parentheses.

2.2.11.3 When accessing values in a pointer to a record you must dereference first.

2.2.11.1 When assigning an event handling entry point, prefix it with an 2.2.11.2 When calling a procedure variable use this syntax: theprocname().

2.2.10.2 Nested procedures/functions as procedural variables.

2.2.10.1 Order of parameter evaluation.

2.2.9 Property and method differences Delphi -> FPC/LCL.

2.2.8 Major unit differences between Lazarus and Delphi.

2.2.7 Finding a missing identifier.

2.2.5 Useful compiler variables / defines / macros.

2.2.4 Cross-Platform considerations.

2.2.3 Selecting the right compiler mode.

2.2.2 Converting Delphi projects/forms/units to Lazarus.

2.2.1 Delphi / Kylix file equivalents in Lazarus.

2.2 Conversion problems and solutions.

2.1.3 Delphi VCL, Kylix CLX Sources in Lazarus.

2.1.2 Initial items to watch out for.

2.1 Setting up the Lazarus environment for a conversion project.

1 Selecting a component or library for conversion.

This document was placed into the wiki knowledge-base area so itĬould be easily extended by anyone who had encountered a unique problemĪnd would like to post it for others to be aware of. Process when translating existing code from Delphi to Lazarus. The purpose of this guide is to document some of the specificĭifferences that are frequently encountered during the code conversion Please see the Lazarus For Delphi Users guide for a description of some of the functional differences. and in someĪreas, FPC is enhanced and can be more demanding about correct syntax. ThereĪre a number of library call and convention differences. Have aspects in common with Delphi and Kylix, they are not clones. While Lazarus and the Free Pascal Compiler

FREE PASCAL DEFINE TYPE HOW TO

This page is about how to port or convert existing Delphi or Kylix code to work with the Free PascalĬompiler and Lazarus IDE.