How to create form dynamically in Delphi

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Well I’m having trouble creating the form in Delphi, I’m using a procedure but it’s giving direct error.

Could someone tell me a more efficient way to create a form in Delphi?

Current code:

procedure TLogin.CriarForm(NomeForm: TFormClass);
begin
  //Procedimento para criar formulario na memória
  with NomeForm do begin
    Try begin 
      TForm(NomeForm):=NomeForm.Create(Application); 
      TForm(NomeForm).Showmodal;
    end;

    Finally
      FreeAndNil(NomeForm);
    End; 
  end;
end;
delphi delphi-xe5

  • vixi man the Delphi xe5 n speech only points to the parameter qnd calls the Creatform(frmPrincipal) function; even with quotes from the error

  • By your code, you have to inform the form class, for example: CriarForm(TfrmPrincipal) repair the T at first.

  • blz I’ll try to group it

  • msm error dnv...

  • I tested here and it worked... Not knowing which error appears is hard to help. :/

  • let me see if anything pops up down here in the bug fixes

  • undeclared Identifier seems to have q declare the form somewhere

  • In Uses you put the Unit form?

  • I put a uses there on top of the data module frmPrincipal n puis pa automatically create qnd compiles to create dynamically afterwards

  • put in uses agr and gave msm error

  • ae agr was missing a point

  • CriarForm(frmSistema.TPrincipal);

  • blz vlw I’ll take a look at her

  • Gabriel, if possible edit the question and put the error that was presented! If you prefer post an answer with the error resolution. :)

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2 answers

1


The error in your code is in: 

procedure TLogin.CriarForm(NomeForm: TFormClass);
begin
  //Procedimento para criar formulario na memória
  with NomeForm do begin
    Try begin //<- Não se abre um bloco begin-end dentro de blocos try-finally
      TForm(NomeForm):=NomeForm.Create(Application); 
      TForm(NomeForm).Showmodal;
    end; 

    Finally
      FreeAndNil(NomeForm);
    End; 
  end;
end;

The correct form would be:

procedure TLogin.CriarForm(NomeForm: TFormClass);
begin
  //Procedimento para criar formulario na memória
  with NomeForm do 
  begin
    Try
      TForm(NomeForm):=NomeForm.Create(Application); 
      TForm(NomeForm).Showmodal;
    Finally
      FreeAndNil(NomeForm);
    End; 
  end;
end;

0

If "Tformclass" is a class reference, the code can look like this:

procedure TLogin.CriarForm(NomeForm: TFormClass);
var
  form: TForm;
begin
  form := NomeForm.Create(Application);
  try
    form.ShowModal; 
  finally
    form.Free;
  end;
end;

In this case, Nomeform would be a reference to the class of Tform or descendant to be created. P.ex.: type TFormClass = class of TForm; ...

Criaform(Tform1); //creates and displays a Tform1 instance Criaform(Tform2); //creates and displays a Tform2 instance ...

  • Try to explain what you are doing in the code so that this answer is more tangible to future users and to the owner of the question.

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