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Dynamic Form Creation

skin444
skin444 asked
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Last Modified: 2010-05-18
Hiya,

Is it possible to instantiate objects (specifically a TForm) dynamically
at run-time from a String with value := to the name of a specific form?
I'm assuming it's not possible to store the Form object itself in a
Paradox table but I could store the name of the Form as a string, no?

Any little code snippet would be appreciated.

Thanks,
 Bob Skinner

rskinner@ix.netcom.com
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Commented:
It is possible to create a form based on the name of the class.

Form1 is of class TForm1
FormMain is of class TForm2

This requires you to add code to register the forms in the initialization section of the units. The following code works under Delphi 3, I'm not sure whether D2 will accept it.

----------------------
unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  fc      : TPersistentClass;
  f       : TForm;
begin
  fc := GetClass('TForm2');
  if fc <> nil then begin
    f :=  TFormClass(fc).Create(Application);
    f.Show;
  end;
end;

initialization
  RegisterClass (TForm1);
end.
------------------------------------
unit Unit2;

interface

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

type
  TForm2 = class(TForm)
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.DFM}

initialization
  RegisterClass (TForm2);
end.
-----------------------



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Commented:

Thanks sperling!

It does work under D2.  Code sample was just what I was looking for.

-Bob
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