Delphi-Crear objetos mediante su clase

7/21/2019 Delphi-Crear objetos mediante su clase

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Crear objetos mediante su clase

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Del phi 7 Del phi InterBase Trucos Delphi XE3
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2/5


Enviado por coso

Este componente muestra como trabajar con una lista de objetos neutros mediante arreglos o arrays, asi como crear un objclase, o bien el nombre de clase desde una cadena

Delphi [-]

unit caja;

interface

uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls,extctrls,typinfo;

type TCaja = class (TScrollBox) public objetos : array of TObject; procedure Add(AClass : TPersistentClass); constructor Create(AOwner : TComponent); override ; destructor Destroy; override ;end ;

procedure Register ;

implementation

constructor TCaja.Create(AOwner : TComponent);begin inherited Create(AOwner); setlength(objetos,0);end ;

destructor TCaja.Destroy;var i : integer;begin for i := High(objetos) downto 0 do objetos[i].Free;

setlength(objetos,0); inherited Destroy;end ;

procedure TCaja.Add(AClass : TPersistentClass);var ComponentMetaClass : TComponentClass; l : integer;
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j : integer; w : TControl;begin registerclass(AClass); ComponentMetaClass := TComponentClass(AClass);

l := length(objetos);

setlength(objetos,l+1); objetos[l] := ComponentMetaClass.Create(self);

if objetos[l] is TControl then begin w := objetos[l] as TControl; w.Name := w.ClassName + inttostr(l);

for j := l - 1 downto 0 do if objetos[j] is TControl then begin w.Top := (objetos[l-1] as TControl).Top + (objetos[l-1] as TControl).Height+5; break; end ; w.Parent := self; w.Left := 10;

end ;end ;

procedure Register ;begin RegisterComponents( 'test' , [TCaja]);end ;

end .

y un ejemplo de uso

Delphi [-]

procedure TForm1.Button1Click(Sender: TObject);var i : integer;begin for i := 0 to 10000 do begin Caja1.Add(TDBGrid);
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Caja1.Add(TShape); Caja1.Add(TButton); Application.ProcessMessages; end ;end ;

procedure TForm1.Button2Click(Sender: TObject);begin registerclasses([TLabel,TDBGrid,TShape,TQuickRep]);

try

Caja1.Add(GetClass(InputBox( 'clase' , 'clase (tiene que estar previamente registrada en la aplicacin)' , ' except MessageDLG( 'probablemente esta clase no esta registrada' ,mtError,[mbOk],0); end ;end ;

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Delphi-Crear objetos mediante su clase