unit FormManage;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Image1: TImage;
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
//..........打开[进货单]窗体并隐藏主窗体........
procedure TForm1.Button2Click(Sender: TObject);
begin
input.Visible:= ture;
info.Caption:='资料管理';
Manage.Hide;

end;
//.........打开[资料管理]窗体并隐藏管理窗体......
procedure TForm1.Button1Click(Sender: TObject);
begin
 info.Visible:=ture;
info.caption:='资料管理';
Manage.Hide;

end;
//........... 管理主界面窗体关闭时返回登录界面.....
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
login.show;
end;

end.
运行时出现错误
[Error] FormManage.pas(35): Record, object or class type required
[Error] FormManage.pas(35): Undeclared identifier: 'ture'
[Error] FormManage.pas(36): Undeclared identifier: 'info'
[Error] FormManage.pas(37): Undeclared identifier: 'Manage'
[Error] FormManage.pas(43): Undeclared identifier: 'info'
[Error] FormManage.pas(43): Undeclared identifier: 'ture'
[Error] FormManage.pas(44): Missing operator or semicolon
[Error] FormManage.pas(45): Undeclared identifier: 'Manage'
[Error] FormManage.pas(51): Undeclared identifier: 'login'
[Fatal Error] jxc.dpr(5): Could not compile used unit 'FormManage.pas'
是怎么一回事啊
  我是新学来做一课设的,不懂是什么意思,哪个帮个忙,谢谢了

这些变量在当前单元中都不存在。

没有声明这些变量,需要引用你所调用的窗体。。

谢谢了