我之前声明了许多公共变量,但在 Delphi-XE3 中是第一个。
我声明 public var 好,但不能在其他形式上使用它,但我不知道为什么?
我的主要联合代码:
unit uMian;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ComCtrls;
type
TForm1 = class(TForm)
btnLoad: TButton;
btnShow: TButton;
btnEaxit: TButton;
lvStudent: TListView;
btnAdd: TButton;
procedure btnEaxitClick(Sender: TObject);
procedure btnLoadClick(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure btnAddClick(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
var
IsOpen : Boolean ;
public
{ Public declarations }
var
myvar : Integer ;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses uAdd;
function AppDir () : string ;
begin
Result := ExtractFilePath(Application.ExeName);
end;
procedure TForm1.btnAddClick(Sender: TObject);
begin
if IsOpen then
frmAdd.ShowModal ;
end;
procedure TForm1.btnEaxitClick(Sender: TObject);
begin
close;
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if IsOpen then
//CloseFile(DataFile);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
IsOpen := False ;
end;
....
end.
这是很好的工作,没有问题。
但是当我在其他表单 FrmAdd 上使用时,我遇到了问题:
unit uAdd;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Buttons,
Vcl.Samples.Spin, Vcl.ExtCtrls;
type
TfrmAdd = class(TForm)
lbledtName: TLabeledEdit;
lbledtAvg: TLabeledEdit;
seAge: TSpinEdit;
lbleId: TLabeledEdit;
btnCansek: TBitBtn;
btnAdd: TBitBtn;
procedure btnAddClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
frmAdd: TfrmAdd;
implementation
{$R *.dfm}
uses uMian;
procedure TfrmAdd.btnAddClick(Sender: TObject);
begin
// problem in below
ShowMessage(IntToStr(TForm1.myvar)) ;
end;
end.
编译器错误:[dcc32 Error] uAdd.pas(problem line): E2096 Method identifier expected
注意:Cnpackmyvar
在变量列表中显示我,但 Rad Studio Auto-Complete 没有。