Delphi Programming - Downloads, Articles, News & Resources

Object Pascal refers to a branch of object oriented derivatives of Pascal, mostly known as the primary programming language of CodeGear Delphi. Borland used the name "Object Pascal" for the programming language in the first versions of Delphi, but later renamed it to the "Delphi programming language". However, compilers that claim to be Object Pascal compatible are often trying to be compatible with Delphi source code.

CodeGear sells integrated development environments (IDEs) that compile the Delphi programming language to Microsoft Windows, the Microsoft .NET Framework and Linux. The open source Free Pascal project allows the language to be compiled for a range of operating systems including Linux, Mac OS/Mac OS X, Win32, Win64, Windows CE, and for several different hardware architectures. Also, a free compiler, Turbo51, is available for producing code for Intel 8051 chips.

Delphi is mainly used for the development of desktop and enterprise database applications, but it is a general-purpose software development tool suitable for most software projects.

Delphi is distributed in various versions with different features and prices: Personal, Professional, Enterprise (formerly Client/Server) and Architect.

Borland Kylix is a now discontinued equivalent to Delphi for the Linux platform.

Delphi and Kylix use the Pascal-based Delphi programming language, and compile Delphi source code into native x86 code or managed .NET code. They include the VCL/CLX (Visual Component Library), support for COM independent interfaces with reference counted class implementations, and support for a large number[citation needed] of third-party components. Interface implementations can be delegated to fields or properties of classes. Message handlers are implemented by tagging a method of a class with the integer constant of the message to handle. A strong emphasis is placed on database connectivity.

Advantages

- Suitable for Rapid Application Development (RAD)
- Based on a well-designed language, high-level and strongly typed, but able to use low-level code for hardware access and performance(McConnell 1993:49)
- A large community on Usenet and the web (e.g. news://newsgroups.borland.com and Borland's web access to Delphi newsgroups)
- Can compile to a single executable, simplifying distribution and eliminating DLL version issues
- Many VCL (Visual Component Library) and third-party components (usually available with full source code) and tools (documentation, debug tools, etc.)
- Quick optimizing compiler also able to use assembler code
- Multiple platform native code from the same source code
- High level of source compatibility between versions
- Class helpers to bridge functionality available natively in the Delphi RTL
- The language's object orientation features only class- and interface-based polymorphism
- Delphi 2005, Delphi 2006 and Delphi 2007 all support advanced refactoring features such as Method Extraction, etc.
- Metaclasses are first class objects
- There are dedicated string types (as well as null-terminated strings). Strings can be added by using the '+' sign, rather than using functions.
- Objects are actually references to the objects (like in Java), which Delphi implicitly dereferences
- Delphi is strongly type-based.
- Delphi's compiler is extremely efficient and fast.
- Early adopter of "Dependency Injection" or "Inversion of Control". The VCL is a sophisticated "re-usable" component model, extensible by the developer.

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