procedure trayDblClick(Sender: TObject);

3.功能实现

var
  frmMain: TfrmMain;
  tray: TTrayNotifyIcon;

//窗口初始化

procedure TfrmMain.FormCreate(Sender: TObject);
begin
  tray := TTrayNotifyIcon.Create(self); //将窗体创建为托盘
  tray.Icon := application.Icon; //定义托盘的显示图标
  tray.IconVisible := true; //托盘可见
  tray.Hint := '营收数据自检系统';
  tray.PopupMenu := pm1; //给托盘定义一个右击时的弹出菜单
  tray.OnDblClick := trayDblClick; //给托盘定义一个双击事件;
end;

//------------------------------------------------------------------------------
// 双击托盘图标
//------------------------------------------------------------------------------


procedure TfrmMain.trayDblClick(Sender: TObject);
begin
  if frmMain.Showing then frmMain.Hide
  else
    frmMain.Show;
end;