procedure TForm1.FormCreate(Sender: TObject); var a:tbutton; begin a:=tbutton.Create(self); with a do begin Top:=100; Left:=100; Height:=20; Width:=100; Parent:=form1; end; end;
多谢。 那同样的道理,我要自动创建一个Table1 这样写: var Table1 : TTable; S : string; begin Table1 := TTable.Create(self); end;为什么编译时出错:“undeclared identifier TTable”?
unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); procedure FormCreate(Sender: TObject); private { Private declarations } Nums : integer ; public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject); var a:tbutton; begin a:=tbutton.Create(self); with a do begin Nums := Nums + 1 ; Top:=0 + Nums*Button1.Height ; Left:=100 ; Height:=Button1.Height ; Width:=Button1.Width ; name := 'Button'+IntToStr(Nums) ; Onclick := Button1Click; Parent:=form1; end; end;procedure TForm1.FormCreate(Sender: TObject); begin Nums := 1 ; end;end.
procedure TForm1.FormCreate(Sender: TObject); var a:tbutton; begin a:=tbutton.Create(self); with a do begin Top:=100; Left:=100; Height:=20; Width:=100; Parent:=form1; end; end;
var
a:tbutton;
begin
a:=tbutton.Create(self);
with a do
begin
Top:=100;
Left:=100;
Height:=20;
Width:=100;
Parent:=form1;
end;
end;
那同样的道理,我要自动创建一个Table1
这样写:
var
Table1 : TTable;
S : string;
begin
Table1 := TTable.Create(self);
end;为什么编译时出错:“undeclared identifier TTable”?
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
Nums : integer ;
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var
a:tbutton;
begin
a:=tbutton.Create(self);
with a do
begin
Nums := Nums + 1 ;
Top:=0 + Nums*Button1.Height ;
Left:=100 ;
Height:=Button1.Height ;
Width:=Button1.Width ;
name := 'Button'+IntToStr(Nums) ;
Onclick := Button1Click;
Parent:=form1;
end;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
Nums := 1 ;
end;end.
var
a:tbutton;
begin
a:=tbutton.Create(self);
with a do
begin
Top:=100;
Left:=100;
Height:=20;
Width:=100;
Parent:=form1;
end;
end;