?
Solved

interface at different units

Posted on 2004-04-21
6
Medium Priority
?
281 Views
Last Modified: 2010-04-05
Hi, I create a unit and put this code there:

unit Unit2;

interface

implementation
// the interface code
type
  IAgendas = interface
    ['{2CFE9F89-A88D-4179-9429-2340CC67435B}']
    function getNome(): String;
    procedure setNome(Nome: String);
    function getFone(): String;
    procedure setFone(Fone: String);
  end;

end.

----------------------------------
now I create another unit to use the interface

unit Unit3;

interface

uses Unit2; // to use the interface declared at unit2

implementation

type
  TAgenda = class (TInterfacedObject, IAgendas)
    public
      function getNome(): String;
      procedure setNome(Nome: String);
      function getFone(): String;
      procedure setFone(Fone: String);
    private
      Nome: String;
      Fone: String;
  end;

function TAgenda.getNome(): String;
begin
  Result := Self.Nome;
end;

procedure TAgenda.setNome(Nome: String);
begin
  Self.Nome := Nome;
end;

function TAgenda.getFone(): String;
begin
  Result := Self.Fone;
end;

procedure TAgenda.setFone(Fone: String);
begin
  Self.Fone := Fone;
end;

end.


but it shows an error when I try to compile at Unit3: 'Undeclared identifier: 'IAgendas'

Why it shows me that error? I put the Unit at uses clause and it didn't recognize IAgendas.

Please help me with that, Thanks.
0
Comment
Question by:emu10k1
  • 3
  • 3
6 Comments
 

Author Comment

by:emu10k1
ID: 10883258
I would like use at different units, because if I put it at same unit it works fine.... but if I try to use the interface at another unit it shows me the same error.
0
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10883298
hmmmmm, doesn't give me an error

SHane



___________________________________________________________________

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TForm1 = class(TForm)
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses Unit2;

{$R *.dfm}

end.

___________________________________________________________________

unit Unit2;

interface
 type
 IAgendas = interface
    ['{2CFE9F89-A88D-4179-9429-2340CC67435B}']
    function getNome(): String;
    procedure setNome(Nome: String);
    function getFone(): String;
    procedure setFone(Fone: String);
  end;


implementation

end.
 
___________________________________________________________________


unit Unit3;

interface

uses Unit2;

type
  TAgenda = class (TInterfacedObject, IAgendas)
    public
      function getNome(): String;
      procedure setNome(Nome: String);
      function getFone(): String;
      procedure setFone(Fone: String);
    private
      Nome: String;
      Fone: String;
  end;

implementation

function TAgenda.getNome(): String;
begin
  Result := Self.Nome;
end;

procedure TAgenda.setNome(Nome: String);
begin
  Self.Nome := Nome;
end;

function TAgenda.getFone(): String;
begin
  Result := Self.Fone;
end;

procedure TAgenda.setFone(Fone: String);
begin
  Self.Fone := Fone;
end;

end.


end.
 
0
 
LVL 11

Accepted Solution

by:
shaneholmes earned 2000 total points
ID: 10883316
I did notice that in your Unit2, you have declared your type under your inplementation section, move it up to interface section

Shane

unit Unit2;

interface

implementation
// the interface code
type
  IAgendas = interface
    ['{2CFE9F89-A88D-4179-9429-2340CC67435B}']
    function getNome(): String;
    procedure setNome(Nome: String);
    function getFone(): String;
    procedure setFone(Fone: String);
  end;

end.


Should be


unit Unit2;

interface

// the interface code
type
  IAgendas = interface
    ['{2CFE9F89-A88D-4179-9429-2340CC67435B}']
    function getNome(): String;
    procedure setNome(Nome: String);
    function getFone(): String;
    procedure setFone(Fone: String);
  end;


implementation

end.


Shane
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 

Author Comment

by:emu10k1
ID: 10883352
oh ****... I don't believe that the error was that... what attention lack.

Thanks man :)
0
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10883369
<Smile>

I do that all the time - You can stare at the code for hours.....

SHane
0
 

Author Comment

by:emu10k1
ID: 10883378
:)
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Is your OST file inaccessible, Need to transfer OST file from one computer to another? Want to convert OST file to PST? If the answer to any of the above question is yes, then look no further. With the help of Stellar OST to PST Converter, you can e…
Kernel Data Recovery is a renowned Data Recovery solution provider which offers wide range of softwares for both enterprise and home users with its cost-effective solutions. Let's have a quick overview of the journey and data recovery tools range he…
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question