{ 
  Use the AddSysTrayIcon procedure to add icon to notification area 
  (in FormCreate, for example), and use the ShowBalloonTips procedure 
  when ever you want(of cause must after you called AddSysTrayIcon procedure), 
  and finally call DeleteSysTrayIcon procedure to remove icon from 
  notification area after your using. 
  Add propriety code to the callback message handler. 

  The new feature require IE5 or later. 
} 

unit Unit1; 

interface 

uses 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs; 

{new constant definitions} 

const 
  NIF_INFO = $10; 
  NIF_MESSAGE = 1; 
  NIF_ICON = 2; 
  NOTIFYICON_VERSION = 3; 
  NIF_TIP = 4; 
  NIM_SETVERSION = $00000004; 
  NIM_SETFOCUS = $00000003; 
  NIIF_INFO = $00000001; 
  NIIF_WARNING = $00000002; 
  NIIF_ERROR = $00000003; 

  NIN_BALLOONSHOW = WM_USER + 2; 
  NIN_BALLOONHIDE = WM_USER + 3; 
  NIN_BALLOONTIMEOUT = WM_USER + 4; 
  NIN_BALLOONUSERCLICK = WM_USER + 5; 
  NIN_SELECT = WM_USER + 0; 
  NINF_KEY = $1; 
  NIN_KEYSELECT = NIN_SELECT or NINF_KEY; 
   
  NIN_BALLOONSHOW = WM_USER + 2; 
  NIN_BALLOONHIDE = WM_USER + 3; 
  NIN_BALLOONTIMEOUT = WM_USER + 4; 
  NIN_BALLOONUSERCLICK = WM_USER + 5; 
  NIN_SELECT = WM_USER + 0; 
  NINF_KEY = $1; 
  NIN_KEYSELECT = NIN_SELECT or NINF_KEY; 
  {other constants can be found in vs.net---vc7's dir: PlatformSDK\Include\ShellAPI.h} 

  {define the callback message} 
  TRAY_CALLBACK = WM_USER + $7258; 

  {new NotifyIconData structure definition} 
type 
  PNewNotifyIconData = ^TNewNotifyIconData; 
  TDUMMYUNIONNAME    = record 
    case Integer of 
      0: (uTimeout: UINT); 
      1: (uVersion: UINT); 
  end; 

  TNewNotifyIconData = record 
    cbSize: DWORD; 
    Wnd: HWND; 
    uID: UINT; 
    uFlags: UINT; 
    uCallbackMessage: UINT; 
    hIcon: HICON; 
   //Version 5.0 is 128 chars, old ver is 64 chars 
    szTip: array [0..127] of Char; 
    dwState: DWORD; //Version 5.0 
    dwStateMask: DWORD; //Version 5.0 
    szInfo: array [0..255] of Char; //Version 5.0 
    DUMMYUNIONNAME: TDUMMYUNIONNAME; 
    szInfoTitle: array [0..63] of Char; //Version 5.0 
    dwInfoFlags: DWORD;   //Version 5.0 
  end; 


type 
  TForm1 = class(TForm) 
    procedure FormCreate(Sender: TObject); 
    procedure FormDestroy(Sender: TObject); 
  private 
    IconData: TNewNotifyIconData; 
    procedure SysTrayIconMsgHandler(var Msg: TMessage); message TRAY_CALLBACK; 
    procedure AddSysTrayIcon; 
    procedure ShowBalloonTips; 
    procedure DeleteSysTrayIcon; 
  public 
  end; 

var 
  Form1: TForm1; 

implementation 

{$R *.DFM} 

uses 
  ShellAPI; 

procedure TForm1.SysTrayIconMsgHandler(var Msg: TMessage); 
begin 
  case Msg.lParam of 
    WM_MOUSEMOVE:; 
    WM_LBUTTONDOWN:; 
    WM_LBUTTONUP:; 
    WM_LBUTTONDBLCLK:; 
    WM_RBUTTONDOWN:; 
    WM_RBUTTONUP:; 
    WM_RBUTTONDBLCLK:; 
    //followed by the new messages 
    NIN_BALLOONSHOW: 
    {Sent when the balloon is shown} 
      ShowMessage('NIN_BALLOONSHOW'); 
    NIN_BALLOONHIDE: 
    {Sent when the balloon disappears?Rwhen the icon is deleted, 
    for example. This message is not sent if the balloon is dismissed because of 
    a timeout or mouse click by the user. } 
      ShowMessage('NIN_BALLOONHIDE'); 
    NIN_BALLOONTIMEOUT: 
    {Sent when the balloon is dismissed because of a timeout.} 
      ShowMessage('NIN_BALLOONTIMEOUT'); 
    NIN_BALLOONUSERCLICK: 
    {Sent when the balloon is dismissed because the user clicked the mouse. 
    Note: in XP there's Close button on he balloon tips, when click the button, 
    send NIN_BALLOONTIMEOUT message actually.} 
      ShowMessage('NIN_BALLOONUSERCLICK'); 
  end; 
end; 

  {AddSysTrayIcon procedure add an icon to notification area} 
procedure TForm1.AddSysTrayIcon; 
begin 
  IconData.cbSize := SizeOf(IconData); 
  IconData.Wnd := AllocateHWnd(SysTrayIconMsgHandler); 
  {SysTrayIconMsgHandler is then callback message' handler} 
  IconData.uID := 0; 
  IconData.uFlags := NIF_ICON or NIF_MESSAGE or NIF_TIP; 
  IconData.uCallbackMessage := TRAY_CALLBACK;   //user defined callback message 
  IconData.hIcon := Application.Icon.Handle;    //an Icon's Handle 
  IconData.szTip := 'Please send me email.'; 
  if not Shell_NotifyIcon(NIM_ADD, @IconData) then 
    ShowMessage('add fail'); 
end; 

{ShowBalloonTips procedure carry out the new feature: Balloon Tips} 
procedure TForm1.ShowBalloonTips; 
var 
  TipInfo, TipTitle: string; 
begin 
  IconData.cbSize := SizeOf(IconData); 
  IconData.uFlags := NIF_INFO; 
  TipInfo := 'Please send me email.'; 
  strPLCopy(IconData.szInfo, TipInfo, SizeOf(IconData.szInfo) - 1); 
  IconData.DUMMYUNIONNAME.uTimeout := 3000; 
  TipTitle := 'Happyjoe@21cn.com'; 
  strPLCopy(IconData.szInfoTitle, TipTitle, SizeOf(IconData.szInfoTitle) - 1); 
  IconData.dwInfoFlags := NIIF_INFO;     //NIIF_ERROR;  //NIIF_WARNING; 
  Shell_NotifyIcon(NIM_MODIFY, @IconData); 
  {in my testing, the following code has no use} 
  IconData.DUMMYUNIONNAME.uVersion := NOTIFYICON_VERSION; 
  if not Shell_NotifyIcon(NIM_SETVERSION, @IconData) then 
    ShowMessage('setversion fail'); 
end; 

{here's the deletion procedure} 
procedure TForm1.DeleteSysTrayIcon; 
begin 
  DeallocateHWnd(IconData.Wnd); 
  if not Shell_NotifyIcon(NIM_DELETE, @IconData) then 
    ShowMessage('delete fail'); 
end; 

procedure TForm1.FormCreate(Sender: TObject); 
begin 
  AddSysTrayIcon; 
  ShowBalloonTips; 
end; 

procedure TForm1.FormDestroy(Sender: TObject); 
begin 
  DeleteSysTrayIcon; 
end; 
end.