一个简单的系统托盘程序

Delphi System Tray Application,版本高于D7时设置Application.ShowMainForm := False;在隐藏的时候，任务栏不显示。

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ShellAPI, AppEvnts;
const
  WM_ICONTRAY = WM_USER + 100;
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
    TrayIconData: TNotifyIConData;
  public
    { Public declarations }
    procedure TrayMessage(var aMsg:TMessage);message WM_ICONTRAY;
  end;
var
  Form1: TForm1;

implementation
{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  with TrayIconData do
  begin
    cbSize := SizeOf(TrayIconData);
    wnd := Self.Handle;
    uID := 0;
    uFlags := NIF_MESSAGE + NIF_ICON + NIF_TIP;
    uCallbackMessage := WM_ICONTRAY;
    hIcon := Application.Icon.Handle; //LoadIcon(HInstance,'newIcon'); 加载自己的Icon
    StrPCopy(szTip,Application.Title);
  end;
  Shell_NotifyIcon(NIM_ADD,@TrayIconData);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Shell_NotifyIcon(NIM_DELETE,@TrayICONData);
end;

procedure TForm1.TrayMessage(var aMsg: TMessage);
begin
  case aMsg.LParam of
    WM_LBUTTONDOWN:
    begin
      ShowMessage('Left button clicked - let''s SHOW the Form!');
      Application.MainForm.Show;
    end;
    WM_RBUTTONDOWN:
    begin
      ShowMessage('Right button clicked - let''s HIDE the Form!');
      Application.MainForm.Hide;
    end;
  end;
end;

end.