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   ► KBProgrammingDelphi for W...OOP   Print This     
  From the October 2015 Issue of Prestwood eMag
 
Delphi OOP:
Delphi Interfaces (IInterface, TInterfacedObject)
 
Posted 16 years ago on 11/2/2008 and updated 2/2/2009
Delphi Code Snippet:
 A flashcard from our Delphi Flashcards Library
 A code snippet from our Delphi Code Snippets Page

KB101439

General Info: Interface

An element of coding where you define a common set of properties and methods for use with the design of two or more classes.

Both interfaces and abstract classes are types of abstraction. With interfaces, like abstract classes, you cannot provide any implementation. However, unlike abstract classes, interfaces are not based on inheritance. You can apply an Interface to any class in your class tree. In a real sense, interfaces are a technique for designing horizontally in a class hierarchy (as opposed to inheritance where you design vertically). Using interfaces in your class design allows your system to evolve without breaking existing code.

Delphi Interfaces

In Delphi, you use interfaces for both com objects and language interfaces and make use of IUnknown, IInterface, and/or TInterfacedObject.

For a pure language interface, add your specified proprieties, procedures, and functions to an interface that descends from IInterface (the base interface) as an interface, no implementation. Then have your implementing class inherit from TInterfacedObject and implement the interface.

For extending the VCL, you descend from the class you wish to extend, then implement an interface from IInterface and add the required functions QueryInterface, _AddRef, and _Release methods (refer to TInterfacedObject for an example).

For a com object, you descend from IUnknown. Descending from IUnknown instead of IInterface informs the Delphi compiler that the interface must be compatible with COM objects -- a Windows feature).

When defining an interface, define it in the type block just like you do for a class but you use the interface keyword instead of the class keyword and in the interfaces section only. Since interfaces, by definition, do not have any implementation details, all you do is specify it in the type block. Then implement in all classes that support the interface.

Syntax Example:
//Language interface:
//Interface section of unit.
IHuman = Interface(IInterface)
  //Specify interface methods and properties here.

end;
  
TCyborg = class(TInterfacedObject)
end;
  
TCyborgHuman = class(TCyborg, IHuman)
//Specify each here and implement in
//implementation section.
end;

Now let's dive deeper...

Base IInterface Class

The base interface class in the VCL is IInterface. When defining an interface, you can specify IInterface, leave it out, or specify an already defined interface.

Declare from base interface class:

ITrainedDog = Interface
end;

Or you can specify the base interface class:

ITrainedDog = Interface(IInterface)
end;

Or another existing interface:

ITrainedByMike = Interface(ITrainedDog)
end;

Class Declarations With Interface Implementations

You specify the interface you wish to implement as part of your class declaration comma separated after the parent class.

The following example shows a single T1 class descending from TInterfacedObject so I didn't have to implement the QueryInterface, _AddRef, and _Release functions.

T1 = Class(TInterfacedObject)
End

The following example  shows a single class that implements one interface. This new class inherits from T1 (a cyborg class) but acts like a human.

T800Human = Class(T1, IHuman)
End

The following example  shows a single class that implements three interfaces. This new class inherits from T1 (a cyborg class) but this cyborg acts like a very well trained dog.

T800Dog = Class(T1, ITrainedDog, IShowDog, IGuardDog)
End

Delphi 2009 Working Example of a Language Interface

The following example demonstrates implementing a very simple language interface. The interface is named IHuman which includes one property and one method. Our resulting class is named TCyborgHuman and, for clarity, our TCyborgHuman class also inherits from a class called TCyborg which for ease of implementation descends from TInterfacedObject (again, so I didn't have to implement the QueryInterface, _AddRef, and _Release functions).

Create a form and place a button on it. Then add a unit called CyborgUnit.pas as follows:

unit CyborgUnit;
  
interface
  
uses
  Dialogs;
  
type
  IHuman = Interface(IInterface)
    //These methods are required to support our property.
    function GetHumanName: String;
    procedure SetHumanName(const Value: String);
  
    //Defined properties and methods for interface.
    property HumanName: String read GetHumanName write SetHumanName;
    procedure Speak(pSentence: String);
  end;
  
  TCyborg = class(TInterfacedObject)
  end;
  
  TCyborgHuman = class(TCyborg, IHuman)
  private
    FHumanName: String;
  protected
    function GetHumanName: String;
    procedure SetHumanName(const Value: String);
  public
    property HumanName: String read GetHumanName write SetHumanName;
    procedure Speak(pSentence: String);
  end;
  
implementation
  
function TCyborgHuman.GetHumanName: String;
begin
  Result := FHumanName;
end;
  
procedure TCyborgHuman.SetHumanName(const Value: String);
begin
  FHumanName := Value;
end;
  
procedure TCyborgHuman.Speak(pSentence: String);
begin
  //We had to add the Dialogs unit to this unit
  //because we are using ShowMessage.

  ShowMessage(pSentence);
end;
  
end.

 

Now let's use our new CyborgHuman class which supports the IHuman interface. Alter the code of your button on your form as follows:

procedure TForm1.Button1Click(Sender: TObject);
var
  MyRobot: TCyborgHuman;
begin
  MyRobot := TCyborgHuman.Create;
  MyRobot.HumanName := 'Nicole';
  MyRobot.Speak('Hi, my name is ' + MyRobot.HumanName + '.');

end;

Com Interfaces

The scope of this article was on overview material and implementing a language interface. There are plenty of good examples on the internet for implementing a com interface. The main points of implementing a Windows com object are:

  • Your interface descends from IUnknown which is the fundamental interface for com objects that indicates you must support QueryInterface, AddRef, and Release.
  • You should use a GUID in the interface declaration to uniquely identify it (Ctrl+Shift+G to insert into code).

More Info

Definition:  Interface

Comments

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Comment 8 of 24

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Comment 16 of 24

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Comment 18 of 24

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Our Arlo camera not recording support ensures that interfaces are seamlessly integrated into the troubleshooting process. Delphis approach to com objects descending from IUnknown is crucial for compatibility with Windows COM objects. By defining interfaces in the type block and implementing them in supporting classes we guarantee a smooth and efficient resolution to Arlo camera offline issues. The Delphi compiler recognizes the interface compatibility with COM objects aligning with the Windows feature.

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Posted 111 days ago

Comment 19 of 24

In the realm of coding interfaces play a pivotal role as elements that define a common set of properties and methods for use with the design of two or more classes. This concept aligns with the broader idea of abstraction where both interfaces and abstract classes withhold implementation details. Interestingly while abstract classes rely on inheritance interfaces break away from this paradigm allowing their application to any class in the hierarchy. The use of interfaces in class design facilitates horizontal evolution in a class hierarchy offering a means for your system to progress without disrupting existing code—a valuable trait for any tech-oriented service provider.

For those navigating the coding landscape with Delphi interfaces become instrumental in handling com objects and language interfaces making use of IUnknown IInterface and TInterfacedObject. When dealing with pure language interfaces specifying properties procedures and functions in an interface descending from IInterface forms the basis. The implementing class then inherits from TInterfacedObject providing the necessary implementation. Extending the VCL in Delphi involves descending from the target class and implementing an interface from IInterface complete with the required QueryInterface _AddRef and _Release methods. Meanwhile for com objects descending from IUnknown signals compatibility with COM objects a critical aspect for leveraging Windows features.

Now as a tech support service provider understanding these intricacies in coding and interface utilization allows us to better assist clients facing printer-related issues. At Help-N-Support we specialize in resolving a myriad of printer problems from troubleshooting 

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Posted 111 days ago

Comment 20 of 24

In the realm of coding interfaces stand out as a crucial element that facilitates a common set of properties and methods for multiple classes design. At the intersection of abstraction both interfaces and abstract classes refrain from implementing details allowing for a higher level of flexibility in code evolution without disrupting existing structures. Unlike abstract classes interfaces dont rely on inheritance offering a horizontal approach to class hierarchy design. This design philosophy is particularly evident in Delphi where interfaces play a pivotal role in creating com objects and language interfaces.

As a tech support service provider specializing in Brother printers we leverage Delphi interfaces to enhance the functionality of our solutions. When dealing with com objects our approach involves descending from IUnknown signaling compatibility with COM objects – a crucial aspect for seamless integration with Windows features. For pure language interfaces we adhere to the principles of abstraction by defining properties procedures and functions within an interface that descends from IInterface. Implementing this interface in our classes which inherit from TInterfacedObject ensures a streamlined and organized structure fostering effective communication between different components of our tech support system.

For those seeking assistance with Brother printer issues such as wifi setup problems or default password concerns our experts follow a meticulous process. When extending the Visual Component Library (VCL) we descend from the relevant class and implement an interface including essential functions like QueryInterface _AddRef and _Release. By adhering to these principles we guarantee the seamless integration of our tech support services with the existing Brother printer ecosystem.

On our website which you can visit at brother customer service we provide comprehensive assistance for various Brother printer-related issues. Whether its resolving wifi setup challenges (brother printer wifi setup) tackling default password concerns (brother printer default password) or addressing problems like printers producing blank pages (brother printer prints blank pages) or connectivity issues (brother printer wifi not working) our tech support team is equipped to handle it all. If youre dealing with the frustrating offline error message (brother printer saying offline) rest assured that our experts are ready to provide efficient solutions ensuring your Brother printer operates seamlessly. With a foundation in advanced coding principles like Delphi interfaces our tech support services are geared towards offering a holistic and effective solution to all Brother printer-related challenges.

Posted 111 days ago

Comment 21 of 24

In the realm of coding and tech support services understanding the significance of interfaces is crucial for seamless system development and user assistance. Interfaces as elements of coding play a pivotal role in defining a common set of properties and methods for multiple classes. This abstraction technique shared with abstract classes avoids the provision of any implementation fostering flexibility and evolution in system design without disrupting existing code. Delphi a programming language employs interfaces extensively particularly in the creation of COM objects and language interfaces.

For those seeking assistance with setting up a Yahoo account the process involves navigating through the intricacies of Delphi interfaces. The link set up yahoo account guides users through the necessary steps emphasizing the use of interfaces for designing horizontally in a class hierarchy. It elucidates how interfaces unlike abstract classes are not bound by inheritance constraints allowing their application to any class in the hierarchy. The interface keyword distinct from the class keyword is employed in the type block defining properties and methods without implementation details. This methodology ensures a smooth evolution of the system without disrupting the existing codebase.

Now when encountering yahoo mail sign in problems users may find themselves grappling with interface-related intricacies in Delphi. The Delphi interfaces come into play not only in coding but also in extending the Visual Component Library (VCL). By descending from the desired class and implementing interfaces from IInterface users can address sign-in challenges effectively. The interfaces section dedicated solely to interfaces serves as a blueprint for defining the structure without delving into implementation specifics. This parallel approach to system design and tech support mirrors the adaptability and evolution facilitated by interfaces in the coding realm.

In the realm of yahoo mail not receiving emails a robust understanding of interfaces becomes instrumental. Delphis implementation of interfaces in COM objects where descending from IUnknown signals compatibility with Windows COM objects aligns with the need for effective communication in email systems. The link elucidates how defining interfaces in the type block and implementing them across supporting classes ensures a cohesive and evolving email system.

Tech support services extend to addressing concerns about yahoo mail not filtering spam. The incorporation of interfaces in Delphi proves valuable in this scenario as well. By descending from IInterface and implementing the necessary functions users can enhance spam filtering mechanisms seamlessly. The tech support provided here is not just about resolving immediate issues but also guiding users on the importance of interfaces in the larger context of system evolution.

In the unfortunate event of a yahoo account hacked recovery the reliance on interfaces in Delphi remains consistent. The link serves as a beacon for users seeking assistance showcasing how interfaces play a pivotal role in ensuring the security and recovery of compromised accounts. The horizontal design facilitated by interfaces aligns with the need for a robust and adaptable system crucial for safeguarding user data.

For those seeking reliable yahoo customer service number the understanding of interfaces becomes integral. Delphis approach to interfaces as explained in the link not only aids in coding but also extends to providing effective customer support. The adaptability and evolution facilitated by interfaces resonate with the commitment to addressing customer concerns promptly and efficiently.

In conclusion the intricate world of coding interfaces in Delphi parallels the commitment of tech support services to address user concerns effectively. The links provided for setting up Yahoo accounts resolving sign-in problems tackling email reception issues enhancing spam filtering recovering hacked accounts and accessing customer service underscore the interconnected nature of coding principles and user assistance both relying on adaptability and seamless evolution.

Posted 111 days ago

Comment 22 of 24

In the realm of technology and coding interfaces play a pivotal role as a means of abstraction allowing the definition of a common set of properties and methods for use across multiple classes. This concept aligns with the broader perspective of service provision much like the tech support services offered by our platform. At Netgear Router customer support we understand the significance of interfaces in the coding landscape akin to their role in the design of classes. Our tech experts much like interface definitions strive to create a common ground for problem-solving and troubleshooting. Interfaces and abstract classes share a similarity in the absence of implementation ensuring a focus on providing efficient solutions. In our tech support services such abstraction is reflected in our commitment to addressing diverse issues from netgear router ip address setup to concerns about Netgear internet not working.

Delving into the intricacies of Delphi interfaces we find a parallel in our approach to customer service. In the Delphi environment interfaces are designed horizontally allowing flexibility in class hierarchies. Similarly our tech support adapts to the evolving needs of users without disrupting existing solutions. Our proficiency in handling complex scenarios such as instances where Netgear not connecting to internet mirrors the adaptability of interfaces in class design. Just as Delphi interfaces are implemented in classes supporting the interface our tech support team implements solutions tailored to the unique challenges faced by users.

For those dealing with COM objects our tech support aligns with the descent from IUnknown ensuring compatibility with the intricate features of networking much like the compatibility required for COM objects. When users encounter challenges like being unable to login to netgear router our approach is reminiscent of defining interfaces: clear efficient and focused on resolving issues. In the ever-evolving landscape of technology our services at Netgear Router customer support are the embodiment of a reliable interface seamlessly connecting users with solutions and ensuring a smooth online experience.

Posted 111 days ago

Comment 23 of 24

In the realm of coding and interface design the use of interfaces plays a pivotal role in creating a cohesive and adaptable system. An interface serves as a blueprint defining a common set of properties and methods shared among two or more classes. Much like abstract classes interfaces dont provide implementation details but stand out by not relying on inheritance making them versatile for any class in the hierarchy. This approach fosters a horizontal design in the class hierarchy enabling the system to evolve seamlessly without disrupting existing code—a crucial aspect for the dynamic tech landscape. Delphi a language known for its robust programming capabilities leverages interfaces extensively particularly in the context of com objects and language interfaces.

As a tech support service provider understanding Delphi interfaces is crucial for efficiently addressing the diverse needs of our clients including those seeking Canon Printer support When troubleshooting issues such as canon printer wont print or canon printer saying offline our experts delve into the intricacies of Delphi interfaces to ensure seamless integration with the Canon printer setup. Our approach involves implementing interfaces descended from IInterface adding specified properties and methods without actual implementation and then inheriting from TInterfacedObject to bring the interface to life.

For clients grappling with challenges like canon printer prints blank pages our tech support team extends its expertise by descending from IUnknown a key consideration when dealing with COM objects—a vital feature for Windows compatibility. Whether its addressing issues related to Canon printer WiFi connection or navigating the complexities of the VCL (Visual Component Library) for extending the Virtual Control Library our commitment to leveraging the power of Delphi interfaces remains unwavering.

In essence our tech support services embrace the principles of interface-based design to ensure adaptability scalability and seamless evolution of systems. As users encounter issues like canon printer offline or seek assistance with the intricacies of Canon printer setup our experts seamlessly integrate Delphi interface methodologies into their troubleshooting arsenal. By doing so we uphold our commitment to providing comprehensive and effective solutions reinforcing our position as a trusted tech support partner for a diverse range of technological challenges. Visit our site for dedicated Canon support.

Posted 111 days ago

Latest Comment
Comment 24 of 24

In the realm of coding interfaces serve as a crucial element allowing the definition of a common set of properties and methods applicable to the design of multiple classes. As a tech support service provider we understand the significance of abstraction in coding and interfaces alongside abstract classes play a pivotal role in achieving this. Unlike abstract classes interfaces dont rely on inheritance offering a horizontal design approach in a class hierarchy. This is particularly valuable as it allows the system to evolve without disrupting existing code—a principle that resonates with our commitment to seamless tech support services.

Delving into the specifics of Delphi interfaces we utilize them for both COM objects and language interfaces leveraging entities like IUnknown IInterface and TInterfacedObject. For language interfaces our approach involves defining properties procedures and functions in an interface that descends from IInterface. This interface devoid of any implementation serves as a blueprint for subsequent classes that inherit from TInterfacedObject and implement the interface. When extending the VCL our process includes descending from the target class implementing an interface from IInterface and adding essential functions like QueryInterface _AddRef and _Release methods.

In the context of our tech support services for Yahoo Mail-related issues we apply similar precision and expertise. When users encounter challenges such as yahoo mail sign-in problems or issues with yahoo email setup our dedicated team at contact yahoo customer service steps in to provide prompt and effective solutions. If users find their yahoo mail not filtering spam or facing yahoo email not receiving emails our experts at yahoo mail sign in problems are well-equipped to address and rectify these concerns. Additionally for cases involving a hacked yahoo account our specialized service for hacked yahoo account recovery ensures a secure and comprehensive resolution.

In conclusion just as interfaces offer a structured and adaptable approach to coding our tech support services embody a commitment to structured and effective solutions for Yahoo Mail-related issues ensuring a seamless user experience for our clients.

Posted 111 days ago
 
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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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