在Delphi XE中将类作为过程的参数传递 [英] Passing a class as a parameter of a procedure in Delphi XE

问题描述

我需要做的是这样的事情：

what i need to do is something like this:

procedure A(type_of_form);
var form: TForm;
begin
  form := type_of_form.Create(application);
  form.showmodal;
  freeandnil(form);
end;

我为每个动态创建的表单执行了以下操作：

I did this for every dynamically created form:

form1 := TForm1.Create(application);
form1.showmodal;
freeandnil(form1);

我将在过程A中执行的操作比较复杂，但问题在于如何进行创建形式有些一般。也许带@运算符的东西……我真的不知道。

What i will do inside procedure A is more complex, but the problem resides in how to make the creation of the form somewhat general. Perhaps something with @ operator... i really do not know.

感谢您的任何建议！

Thanks for any suggestion!

推荐答案

procedure Test(AMyFormClass: TFormClass);
var
 form: TForm;
begin
  form := AMyFormClass.Create(Application); // you can use nil if you Free it in here
  try
    form.ShowModal;
  finally
    form.Release; // generally better than Free for a Form
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Test(TForm2);
end;

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