Ошибка e2003 delphi

In this code:

uses 
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, 
  Forms, Dialogs, IdBaseComponent, IdComponent, IdTCPConnection, 
  IdTCPClient, IdIOHandler, IdGlobal, StdCtrls;

function WaitForCommand(args: Pointer): Cardinal; stdcall;
begin
  while client.Connected do
    if not HandleResponse(client.IOHandler) then
      break;
  Result := 0;
end;

I have this error:

[DCC Error] Unit1.pas(159): E2003 Undeclared identifier: ‘HandleResponse’

AmigoJack's user avatar

AmigoJack

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asked Feb 22, 2022 at 6:30

MrCamarium's user avatar

8

How to understand messages?

Let’s read it in parts:

  1. [DCC Error]

    DCC is the Delphi Compiler, so it is about our code, not about linking or packaging.

  2. Unit1.pas

    The file in which the error occurred. Normally Delphi’s editor automatically display this file to you.

  3. (159)

    The line in which an error occurred. Normaly Delphi’s editor automatically puts your text cursor into this line.

  4. E2003

    That’s is the code of the error in case any further text is unavailable. It is like HTTP’s status 404 is a code (with the actual text «Not Found» for it) or like a traffic’s light red is a code (without any further text telling you to stop).

  5. Undeclared identifier:

    At this point the compiler does not know how to interpret what is now named. And and even cannot tell you if it is a missing function, a missing type, or else — hence the overall term «identifer».

  6. ‘HandleResponse’

    Normally Delphi’s editor automatically puts your text cursor in the line of issue at the start of the text that cannot be understood.

What could you do?

It is undeclared. Declare it. However, only you can know what you want. You could

  • declare a type: 
    type
  HandleResponse= Boolean;
  • define a function: 
    function HandleResponse(h: TIdIOHandler): Boolean;
begin
  result:= FALSE;
end;
  • import a function from a DLL: 
    function HandleResponse(p: Pointer): LongBool; stdcall; external 'any.dll';
  • add the unit that might already have it: 
    uses
  WhatIsMissingSoFar;

…or do other things I yet have to remember. But I’m sure you understand that in these 3 examples the identifier HandleResponse is now declared. I don’t have to tell you that declarations must be done before using it, right?

answered Feb 22, 2022 at 21:13

AmigoJack's user avatar

AmigoJackAmigoJack

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4

Источник

Go Up to Error and Warning Messages (Delphi)

The compiler could not find the given identifier — most likely it has been misspelled either at the point of declaration or the point of use. It might be from another unit that has not mentioned a uses clause. 

program Produce;
var
  Counter: Integer;
begin
  Count := 0;
  Inc(Count);
  Writeln(Count);
end.

In the example, the variable has been declared as «Counter», but used as «Count». The solution is to either change the declaration or the places where the variable is used. 

program Solve;
var
  Count: Integer;
begin
  Count := 0;
  Inc(Count);
  Writeln(Count);
end.

In the example we have chosen to change the declaration — that was less work.

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артист

98 / 33 / 21

Регистрация: 17.09.2014

Сообщений: 1,503

1

12.10.2017, 01:58. Показов 3217. Ответов 5

Метки нет (Все метки)

Студворк — интернет-сервис помощи студентам

Ругалось на null в этой строке:

Delphi 
1

if s <> null then

Погуглил, гугл сказал, что это из библиотеки Variants, переменная без значения.

Поставил просто 0 — всё скомпилировалось:

Delphi 
1

if s <> 0 then

Но т.к. я пока не разобрался с основами, решил уточнить.
Просто в Java Script например 0 и не присвоенное значение совершенно разные вещи.
Может и в делфи так, и теперь код будет работать не так?

А где вообще взять эту библиотеку(Variants)?
Не находит ничего в гугле…



0

пофигист широкого профиля

4681 / 3117 / 857

Регистрация: 15.07.2013

Сообщений: 17,967

12.10.2017, 02:05

2

В Дельфи есть модуль Variants. На него в первую очередь и смотрите.

Цитата
Сообщение от артист
Посмотреть сообщение

Ругалось на null в этой строке:
Delphi
Выделить код
1
if s <> null then

Более подробно код приведите.



1

артист

98 / 33 / 21

Регистрация: 17.09.2014

Сообщений: 1,503

12.10.2017, 16:02

 [ТС]

3

4я строка:

Delphi 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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//converts a hex value to a TColor
function HexToTColor(s: OleVariant): TColor;
begin
 if s <> null then
  begin
   if not IsSpecialColor(s) then
    begin
     s := FormatHexColor(s);
     if s <> '' then
      Result := RGB(StrToInt('$'+Copy(S, 1, 2)), StrToInt('$'+Copy(S, 3, 2)), StrToInt('$'+Copy(S, 5, 2)))
     else
      Result := clNone;
    end
   else
    if IsMember(SPECIAL_NAMES, SPECIAL_COUNT, s) then
     begin
      s := GetHexFromName(s);
      Result := RGB(StrToInt('$'+Copy(S, 1, 2)), StrToInt('$'+Copy(S, 3, 2)), StrToInt('$'+Copy(S, 5, 2)));
     end
    else
     Result := GetValueFromName(s);
  end
 else
  Result := clNone;
end;

В uses он есть:

Delphi 
1
2

uses
 SysUtils, Windows, Graphics{$IFDEF DELPHI_6_UP}, Variants{$ENDIF};

А в компиляторе нет, видимо, я не знаю где его искать…
Заходил в Component > Install Packages.
Ничего нет с названием variants.

Добавлено через 13 часов 33 минуты
Есть у меня эти варианты…
Решил проблему так:

Delphi 
1
2

uses
 SysUtils, Windows, Graphics{$IFDEF DELPHI_6_UP}, Variants{$ENDIF};
Delphi 
1
2

uses
 SysUtils, Windows, Graphics, Variants;

Добавлено через 16 минут
Эта фигня:

Delphi 
1

{$IFDEF DELPHI_6_UP}{$ENDIF}

Вообще не работает.



0

12 / 10 / 5

Регистрация: 22.07.2015

Сообщений: 212

12.10.2017, 16:53

4

Какая версия программы. Variants это старое название модуля не помню до какой версии. System.Variants новое. Попробуй либо (Variants либо System.Variants).

{$IFDEF DELPHI_6_UP}{$ENDIF} эта конструкция указывает компилятору на какой версии использовать Variants. Если версия не подходит он игнорирует модуль.



1

артист

98 / 33 / 21

Регистрация: 17.09.2014

Сообщений: 1,503

12.10.2017, 19:01

 [ТС]

5

У меня с Variants работает.
А не работало, потому, что:

Цитата
Сообщение от Setix
Посмотреть сообщение

{$IFDEF DELPHI_6_UP}{$ENDIF} эта конструкция указывает компилятору на какой версии использовать Variants.

Не указывало, там инклуд был с макросами, не знаю, может я чего не так сделал, но он валялся в папке с исходниками, а в исходниках вверху было такое:

Delphi 
1

{$I mxs.inc}

В общем поудалял я нафиг всё, получилось работать будет с 7й и выше версии, у меня 10ка, норм.



0

12 / 10 / 5

Регистрация: 22.07.2015

Сообщений: 212

13.10.2017, 11:59

6

Лучший ответ Сообщение было отмечено артист как решение

Решение

Цитата
Сообщение от артист
Посмотреть сообщение

{$I mxs.inc}

Эта строка подключает дополнительный файл где и описано

Цитата
Сообщение от артист
Посмотреть сообщение

{$IFDEF DELPHI_6_UP} операторы {$ENDIF}

что входит в этот промежуток. Если условие выполняется, то операторы выполняются. Если не выполняется, то операторы игнорируются.



1
Источник

Delphi Compiler Error

E2003 Undeclared identifier ‘%s’

Reason for the Error & Solution

The compiler could not find the given identifier – most likely it has been misspelled either at the point of declaration or the point of use. It might be from another unit that has not mentioned a uses clause. 

program Produce;
var
  Counter: Integer;
begin
  Count := 0;
  Inc(Count);
  Writeln(Count);
end.

In the example, the variable has been declared as “Counter”, but used as “Count”. The solution is to either change the declaration or the places where the variable is used. 

program Solve;
var
  Count: Integer;
begin
  Count := 0;
  Inc(Count);
  Writeln(Count);
end.

In the example we have chosen to change the declaration – that was less work.

Источник

E2003 Undeclared identifier ‘ShortDateFormat’ error in Delphi XE3 or later versions

E2003 Undeclared identifier ‘ShortDateFormat’ error in Delphi XE3  or later versions

When we upgrade a Delphi old version application to Delphi XE3 or latest one then if we have used ‘ShortDateFormat‘ global variable in our project then we will get ‘E2003 Undeclared identifier ‘ShortDateFormat’ compiler error.

Why we get this error?

As some global variables typically pertain to Date, Time and Currency format (CurrencyString, ShorDateFormat, LongTimeFormat, ShortMonthNames, and so on) have been deprecated and removed declaration from Delphi XE3 or later versions. In old Delphi versions we can find this variables declaration in ‘System.SysUtils’ unit but from Delphi XE3 those are moved with TFormatSettings Record.

Workarounds to solve this error.

We can replace ‘ShortDateFormat‘ with ‘Formatsettings.ShortDateFormat’. And ‘FormatSettings‘ is a global variable of ‘TFormatSettings’ type declared in ‘SysUtils‘ which having these variables.


Errors when we migrate a project from Delphi 7 to Delphi XE3


Undeclared identifier DecimalSeparator
Undeclared identifier CurrencyFormat
Undeclared identifier ThousandSeparator
Undeclared identifier DateSeparator
Undeclared identifier TimeSeparator
Undeclared identifier ShortDateFormat
Undeclared identifier LongDateFormat


Solution to above errors


Formatsettings.DecimalSeparator
Formatsettings.CurrencyFormat
Formatsettings.ThousandSeparator
Formatsettings.DateSeparator
Formatsettings.TimeSeparator
Formatsettings.ShortDateFormat
Formatsettings.LongDateFormat


Following are some other global variables also having same issue:

Global Variable
(System.SysUtils)		 Corresponding
TFormatSettings Field  

CurrencyDecimals

CurrencyDecimals

CurrencyFormat

CurrencyFormat

CurrencyString

CurrencyString

DateSeparator

DateSeparator

DecimalSeparator

DecimalSeparator

ListSeparator

ListSeparator

LongDateFormat

LongDateFormat

LongDayNames

LongDayNames

LongDayNames

LongDayNames

LongTimeFormat

LongTimeFormat

NegCurrFormat

NegCurrFormat

ShortDateFormat

ShortDateFormat

ShortDayNames

ShortDayNames

ShortMonthNames

ShortMonthNames

ShortTimeFormat

ShortTimeFormat

ThousandSeparator

ThousandSeparator

TimeAMString

TimeAMString

TimePMString

TimePMString

TimeSeparator

TimeSeparator

TwoDigitYearCenturyWindow

TwoDigitYearCenturyWindow

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