Question

ItemData in Delphi?

Asked by: xuanthinh

Hi all,
In Visual Basic I use properties ItemData to store number in ComboBox. But in Delphi I don't know how to store number in items of TComboBox. Please help me!
Thank you very much
Best regards

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Asked On
2003-04-23 at 03:55:12ID20593470
Tags

delphi

,

itemdata

,

combobox

Topic

Delphi Programming

Participating Experts
4
Points
100
Comments
7

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Answers

 

by: kretzschmarPosted on 2003-04-23 at 04:13:36ID: 8379096

?
combobox1.items.add(inttostr(AIntegerValueHere));

or
combobox1.items.add(floattostr(AFloatValueHere));

 

by: Claes65Posted on 2003-04-23 at 04:15:47ID: 8379111

Use AddObject('itemtext',TObject(yourdata));

If you need to store many data with each item, use a TList of records and have the data be the pointer to your TList.

 

by: DaFoxPosted on 2003-04-23 at 04:18:05ID: 8379125

Hi.

You might want to take a look at ComboBox.Items.Objects. A object is a pointer and you can store anything in it.

Example:

type
  TIntegerObject = class(TObject)
  private
    FValue: Integer;
  public
    constructor Create(const AValue : integer);
    property Value: Integer read FValue write FValue;
  end;

constructor TIntegerObject.Create(const AValue : integer);
begin
  FValue := AValue;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
 C1: TComboBox;
begin
 C1 := TComboBox.Create(Self);
 C1.Parent := Form1;

 C1.Items.AddObject('-1', TIntegerObject.Create(-1));
 C1.Items.AddObject('-2', TIntegerObject.Create(-2));

 ShowMessage(IntToStr(TIntegerObject(C1.Items.Objects[0]).Value));
 ShowMessage(IntToStr(TIntegerObject(C1.Items.Objects[1]).Value));
end;

Note: You have to create your own TIntegerObject, otherwise your program will crash for some numbers, eg. -1, because -1 will be passed as lParam (it gets interpreted as an error code).

Markus

 

by: Claes65Posted on 2003-04-23 at 04:18:08ID: 8379126

Use AddObject('itemtext',TObject(yourdata));

If you need to store many data with each item, use a TList of records and have the data be the pointer to your TList.

 

by: Claes65Posted on 2003-04-23 at 04:52:19ID: 8379287

DaFox's solution is really what I'm saying as well. Except that I would use a TList object instead defining my own.

 

by: esoftbgPosted on 2003-04-28 at 03:56:42ID: 8411707

May be this simple example (Delphi 7) is helpful:

procedure TForm1.FormCreate(Sender: TObject);
var
  I:      Integer;
begin
  for I := 1 to 12 do
    ComboBox1.AddItem(IntToStr(I), TObject(ShortMonthNames[I]));
end;

procedure TForm1.ComboBox1CloseUp(Sender: TObject);
begin
  ShowMessage(string(ComboBox1.Items.Objects[ComboBox1.ItemIndex]));
end;

emil

 

by: xuanthinhPosted on 2003-05-05 at 03:00:58ID: 8460601

Hi all
Thank you very much for helping me!

20120131-EE-VQP-002

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