如何把窗体关闭到系统托盘

unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls, StdCtrls, AppEvnts; type TForm1 = class(TForm) TrayIcon1: TTrayIcon; Button1: TButton; procedure TrayIcon1Click(Sender: TObject); procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean); procedure Button1Click(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} {关闭} procedure TForm1.Button1Click(Sender: TObject); begin Application.Terminate; end; {点击关闭按钮时让窗体最小化到系统托盘} procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean); begin Tag := Ord(WindowState); WindowState := wsMinimized; TrayIcon1.SetDefaultIcon; TrayIcon1.Visible := True; Hide; CanClose := False; end; {点击系统托盘中的图标恢复窗口} procedure TForm1.TrayIcon1Click(Sender: TObject); begin TrayIcon1.Visible := False; Show; WindowState := TWindowState(tag); SetForegroundWindow(Handle); end; end. -------------------------------------------------------------------------------- 窗体文件: -------------------------------------------------------------------------------- object Form1: TForm1 Left = 0 Top = 0 Caption = 'Form1' ClientHeight = 206 ClientWidth = 339 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False OnCloseQuery = FormCloseQuery PixelsPerInch = 96 TextHeight = 13 object Button1: TButton Left = 232 Top = 40 Width = 75 Height = 25 Caption = 'Button1' TabOrder = 0 OnClick = Button1Click end object TrayIcon1: TTrayIcon OnClick = TrayIcon1Click Left = 160 Top = 104 end end