代码如下:unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
implementation
type
TForm2 = class(TForm) private
{ Private declarations }
public
{ Public declarations }
end;{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage('helo');
end;
procedure TForm1.Button2Click(Sender: TObject);
var
Form2: TForm2;
begin
Application.CreateForm(TForm2, Form2);
Form2.Show;
end;end.点击Button2后,Form2没有显示出来,为什么?
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
implementation
type
TForm2 = class(TForm) private
{ Private declarations }
public
{ Public declarations }
end;{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage('helo');
end;
procedure TForm1.Button2Click(Sender: TObject);
var
Form2: TForm2;
begin
Application.CreateForm(TForm2, Form2);
Form2.Show;
end;end.点击Button2后,Form2没有显示出来,为什么?
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls; type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
type
TEventHandler = class
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
frm: TForm;
implementation
{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage('helo');
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if frm=nil then
begin
frm:=Tform.Create(nil);
frm.Show ;
End;end; end.
procedure TForm1.Button2Click(Sender: TObject);
var
FORM2:TFORM ;
begin
Application.CreateForm(TForm, Form2);
Form2.Show;end;
上面两位的都可以Show出来
procedure TForm1.Button2Click(Sender: TObject);
var
FORM2:TFORM ;
begin
Application.CreateForm(TForm, Form2);
Form2.Show; end;
确实这样就可以,为什么我的代码不行呢?
procedure TForm1.Button2Click(Sender: TObject);
var
FORM2:TFORM ;
begin
Application.CreateForm(TForm, Form2);
Form2.Show; end;
确实这样就可以,为什么我的代码不行呢?