Delphi ошибка unsatisfied forward or external declaration

I am getting an error while compiling .pas file.

«unsatisfied forward or external declaration :TxxxException.CheckSchemeFinMethodDAException.»

Does anyone have any idea what this error implies?

Does it mean that
CheckSchemeFinMethodDAException was not called in all the concerned files?

Toby Allen's user avatar

Toby Allen

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asked Aug 19, 2009 at 16:36

vas's user avatar

You have declared this method but didn’t implement it.

answered Aug 19, 2009 at 16:49

Uwe Raabe's user avatar

Uwe RaabeUwe Raabe

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1

you may have forgotten to put the class name before the function name within the implementation section. for example, the following code will yield your error:

unit Unit1;

interface

type
  TMyClass = class
    function my_func(const text: string): string;
  end;

implementation

function my_func(const text: string): string;
begin
  result := text;
end;

end.

to fix, just change the function implementation to TMyClass.my_func(const text: string): string;.

answered May 23, 2013 at 9:03

mulllhausen's user avatar

mulllhausenmulllhausen

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unit Unit1;

interface

type
  TMyClass = class
    procedure DeclaredProcedure;
  end;

implementation

end.

This yields the error you describe. The procedure DeclaredProcedure is declared (signature) but not defined (implementation part is empty).

You have to provide an implementation for the procedure.

answered Aug 19, 2009 at 18:07

jpfollenius's user avatar

jpfolleniusjpfollenius

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Источник
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unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, Menus;
 
 
type
  TForm1 = class(TForm)
    mm1: TMainMenu;
    edt1: TEdit;
    edt2: TEdit;
    rb1: TRadioButton;
    rb2: TRadioButton;
    rb3: TRadioButton;
    rb4: TRadioButton;
    rb5: TRadioButton;
    rb6: TRadioButton;
    rb7: TRadioButton;
    rb8: TRadioButton;
    btn1: TButton;
    btn2: TButton;
    btn3: TButton;
 
    procedure rb1Click(Sender: TObject);
    procedure rb2Click(Sender: TObject);
    procedure rb4Click(Sender: TObject);
    procedure rb3Click(Sender: TObject);
    procedure rb5Click(Sender: TObject);
    procedure rb6Click(Sender: TObject);
    procedure rb8Click(Sender: TObject);
    procedure rb7Click(Sender: TObject);
    procedure btn1Click(Sender: TObject);
    PROCEDURE DEC_to_P(const st:string;p:byte;Sender: TObject);
    FUNCTION  DEC_to_P0(const n:string;p:byte;Sender: TObject):string;
    PROCEDURE P_to_DEC(const n:string;p:byte;Sender: TObject);
    FUNCTION  P0_to_DEC(const n:string;p:byte;Sender: TObject):string;
    PROCEDURE BIN_to_OCT(const n:string;Sender: TObject);
    PROCEDURE BIN_to_HEX(const n:string;Sender: TObject);
    PROCEDURE OCT_to_BIN(const n:string;Sender: TObject);
    PROCEDURE HEX_to_BIN(const n:string;Sender: TObject);
    PROCEDURE OCT_to_HEX(const st:string;Sender: TObject);
    PROCEDURE HEX_to_OCT(const st:string;Sender: TObject);
    procedure Edt1KeyPress(Sender: TObject; var Key: Char);
    procedure btn2Click(Sender: TObject);
    procedure btn3Click(Sender: TObject);
 
 
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
  const
cod:array[0..15]of char=
 ('0','1','2','3','4','5','6','7','8','9','A','B','C','D',
  'E','F');
cod2:array[0..7]of string[3]=
 ('000','001','010','011','100','101','110','111');
cod3:array[0..15]of string[4]=
 ('0000','0001','0010','0011','0100','0101','0110','0111',
  '1000','1001','1010','1011','1100','1101','1110','1111');
 
  var
  Form1: TForm1;
    i:integer;
  tmp4:string;
  flag_clear:boolean;
 
 
implementation
 
{$R *.dfm}
 
 
FUNCTION IsFloatBIN(ch:char; st:string):char;
BEGIN
IsFloatBIN:=chr(0);
if (ch>='0')and(ch<='1')
  or(ch=#13)or(ch=#8) then IsFloatBIN:=ch;
 
case ch of
',': if (Pos(',',st) = 0)and(st[Length(st)]>='0') then IsFloatBIN:=ch;
end;
END;
 
FUNCTION IsFloatOCT(ch:char; st:string):char;
BEGIN
IsFloatOCT:=chr(0);
if (ch>='0')and(ch<='7')
  or(ch=#13)or(ch=#8) then IsFloatOCT:=ch;
 
case ch of
',': if (Pos(',',st) = 0)and(st[Length(st)]>='0') then IsFloatOCT:=ch;
end;
END;
 
FUNCTION IsFloatDEC(ch:char; st:string):char;
BEGIN
IsFloatDEC:=chr(0);
if (ch>='0')and(ch<='9')// Списала код Cyberforum!
  or(ch=#13)or(ch=#8) then IsFloatDEC:=ch;
 
case ch of
',': if (Pos(',',st) = 0)and(st[Length(st)]>='0') then IsFloatDEC:=ch;
end;
END;
 
FUNCTION IsFloatHEX(ch:char; st:string):char;
BEGIN
IsFloatHEX:=chr(0);
case ch of
'Ф','ф': ch:='A';
'И','и': ch:='B';
'С','с': ch:='C';
'В','в': ch:='D';
'У','у': ch:='E';
'А','а': ch:='F';
end;
if (ch>='0')and(ch<='9')
  or(upcase(ch)>='A')and(upcase(ch)<='F')
  or(ch=#13)or(ch=#8) then IsFloatHEX:=upcase(ch);
 
case ch of
',': if (Pos(',',st) = 0)and(st[Length(st)]>='0')then IsFloatHEX:=ch;
end;
END;
 
procedure TForm1.edt1KeyPress(Sender: TObject; var Key: Char);
begin
edt2.Text:='';
if key=#13 then
 begin
  btn1.SetFocus;
  exit;
 end;
if rb1.Checked then key:=IsFloatBIN(key,edt1.Text) else
if rb2.Checked then key:=IsFloatOCT(key,edt1.Text) else
if rb3.Checked then key:=IsFloatDEC(key,edt1.Text) else
if rb4.Checked then key:=IsFloatHEX(key,edt1.Text);
end;
 
procedure TForm1.rb1Click(Sender: TObject);
begin
rb5.Enabled:=false;
rb6.Enabled:=true;
rb7.Enabled:=true;
rb8.Enabled:=true;
if rb5.Checked then rb6.Checked:=true;
edt1.Text:='0';
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb2Click(Sender: TObject);
begin
rb5.Enabled:=true;
rb6.Enabled:=false;
rb7.Enabled:=true;
rb8.Enabled:=true;
if rb6.Checked then rb5.Checked:=true;
edt1.Text:='0';
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb4Click(Sender: TObject);
begin
rb5.Enabled:=true;
rb6.Enabled:=true;
rb7.Enabled:=true;
rb8.Enabled:=false;
if rb8.Checked then rb7.Checked:=true;
edt1.Text:='0';
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb3Click(Sender: TObject);
begin
rb5.Enabled:=true;
rb6.Enabled:=true;
rb7.Enabled:=false;
rb8.Enabled:=true;
if rb7.Checked then rb6.Checked:=true;
edt1.Text:='0';
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb5Click(Sender: TObject);
begin
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb6Click(Sender: TObject);
begin
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb8Click(Sender: TObject);
begin
edt1.SetFocus;
edt2.Text:='';
end;
 
procedure TForm1.rb7Click(Sender: TObject);
begin
edt1.SetFocus;
edt2.Text:='';
end;
 
PROCEDURE TForm1.DEC_to_P(const st:string;p:byte;Sender: TObject);
var
ost,tmp,tmp2,b:string;
d:longint;
e,c:integer;
BEGIN
if pos(',',st)=0 then
 begin
  d:=strtoint(st);
  ost:='';
 end else
 begin
  d:=strtoint(copy(st,1,pos(',',st)-1));
  ost:=copy(st,pos(',',st)+1,length(st)-pos(',',st));
 end;
 
 
end;
 
procedure TForm1.btn2Click(Sender: TObject);
begin
edt1.Clear;
edt2.Clear;
end;
 
procedure TForm1.btn3Click(Sender: TObject);
begin
Form1.Close;
end;
 
end.
Источник

Задача: При компиляции проекта возникает ошибка E2065 Unsatisfied forward or external declaration.
Инструментарий: Delphi
Решение:
При компиляции проекта появилась ошибка

[dcc32 Error] <Module Name>.pas(<Line Number>): E2065 Unsatisfied forward or external declaration: ‘<Class Name>.<Method Name>


Рассмотрим упрощенный вариант кода который привел к ошибке:


...
type
TA = class
public
procedure DoSomesting; // <= ошибка тут
end;

implementation

end.

В целом если рассмотреть упрощенны вариант все стает предельно ясно. Нет реализации для метода (в моем варианте это метод DoSomesting). Для решения проблемы — нужно добавить реализацию для метода.


...
type
TA = class
public
procedure DoSomesting;
end;

implementation

procedure TA.DoSomesting;
begin
//
end;

end.

PS: Для автоматической генерации метода в секции implementation можно воспользоваться сочетаем клавиш Ctrl+Shift+C. (Только сперва установите курсор в область описания класса). Если даже после автоматической генерации кода возникает та же ошибка — проверьте код, возможно у Вас используется конструкция {$IFDEF…}{$ELSE}{$ENDIF} и код попал в неиспользуемую секцию.

Источник

Go Up to Error and Warning Messages (Delphi)

This error message appears when you have a forward or external declaration of a procedure or function, or a declaration of a method in a class or object type, and you don’t define the procedure, function or method anywhere.

Maybe the definition is really missing, or maybe its name is just misspelled.

Note that a declaration of a procedure or function in the interface section of a unit is equivalent to a forward declaration — you have to supply the implementation (the body of the procedure or function) in the implementation section.

Similarly, the declaration of a method in a class or object type is equivalent to a forward declaration. 

program Produce;

type
  TMyClass = class
  constructor Create;
  end;

function Sum(const a: array of Double): Double; forward;

function Summ(const a: array of Double): Double;
var
  i: Integer;
begin
  Result := 0.0;
  for i:= 0 to High(a) do
  Result := Result + a[i];
end;

begin
end.

The definition of Sum in the above example has an easy-to-spot typo. 

program Solve;

type
  TMyClass = class
  constructor Create;
  end;

constructor TMyClass.Create;
begin
end;

function Sum(const a: array of Double): Double; forward;

function Sum(const a: array of Double): Double;
var
  i: Integer;
begin
  Result := 0.0;
  for i:= 0 to High(a) do
  Result := Result + a[i];
end;

begin
end.

The solution: make sure the definitions of your procedures, functions and methods are all there, and spelled correctly.

Источник

Delphi Compiler Error

E2065 Unsatisfied forward or external declaration ‘%s’

Reason for the Error & Solution

This error message appears when you have a forward or external declaration of a procedure or function, or a declaration of a method in a class or object type, and you don’t define the procedure, function or method anywhere.

Maybe the definition is really missing, or maybe its name is just misspelled.

Note that a declaration of a procedure or function in the interface section of a unit is equivalent to a forward declaration – you have to supply the implementation (the body of the procedure or function) in the implementation section.

Similarly, the declaration of a method in a class or object type is equivalent to a forward declaration. 

program Produce;

type
  TMyClass = class
  constructor Create;
  end;

function Sum(const a: array of Double): Double; forward;

function Summ(const a: array of Double): Double;
var
  i: Integer;
begin
  Result := 0.0;
  for i:= 0 to High(a) do
  Result := Result + a[i];
end;

begin
end.

The definition of Sum in the above example has an easy-to-spot typo. 

program Solve;

type
  TMyClass = class
  constructor Create;
  end;

constructor TMyClass.Create;
begin
end;

function Sum(const a: array of Double): Double; forward;

function Sum(const a: array of Double): Double;
var
  i: Integer;
begin
  Result := 0.0;
  for i:= 0 to High(a) do
  Result := Result + a[i];
end;

begin
end.

The solution: make sure the definitions of your procedures, functions and methods are all there, and spelled correctly.

Источник

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