在托盘上显示BalloonTooltip

运行这个示例的前提是系统需要Windows 2000 or XP （Shell version 5 or better）。
大家可能对托盘程序很熟悉了，这里我也不再多讲，这段小代码只是说明一下托盘的新特性：显示Balloon Tooltip。至于什么是Balloon Tooltip，只要把一下代码贴到VB中就会看到新鲜效果，再次提醒注意运行环境！

1.建立标准EXE工程，为Form1换一个PP的Icon，加入一个模块，改名为SysTray
SysTray.bas代码：

Option Explicit
Declare Function Shell_NotifyIcon Lib "shell32.dll" Alias _
     "Shell_NotifyIconA" (ByVal dwMessage As Long, _
     lpData As NOTIFYICONDATA) As Long

Public Type NOTIFYICONDATA
    cbSize As Long
    hwnd As Long
    uId As Long
    uFlags As Long
    uCallBackMessage As Long
    hIcon As Long
    szTip As String * 128
    dwState As Long
    dwStateMask As Long
    szInfo As String * 256
    uTimeoutOrVersion As Long   '由于VB中没有Union类型，只能用Long型代替
    szInfoTitle As String * 64
    dwInfoFlags As Long
End Type
 
Public Const NOTIFYICON_VERSION = 3
Public Const NOTIFYICON_OLDVERSION = 0

Public Const NIM_ADD = &H0
Public Const NIM_MODIFY = &H1
Public Const NIM_DELETE = &H2

Public Const NIM_SETFOCUS = &H3
Public Const NIM_SETVERSION = &H4
 
Public Const NIF_MESSAGE = &H1
Public Const NIF_ICON = &H2
Public Const NIF_TIP = &H4

Public Const NIF_STATE = &H8
Public Const NIF_INFO = &H10
 
Public Const NIS_HIDDEN = &H1
Public Const NIS_SHAREDICON = &H2
 

Public Const NIIF_NONE = &H0
Public Const NIIF_WARNING = &H2
Public Const NIIF_ERROR = &H3
Public Const NIIF_INFO = &H1

Public nfIconData As NOTIFYICONDATA

2.Form1的代码：
Option Explicit

Private Sub Form_Load()
    With nfIconData
        .cbSize = Len(nfIconData)
        .hwnd = Me.hwnd
        .uId = vbNull
        .uFlags = NIF_INFO Or NIF_ICON Or NIF_TIP Or NIF_MESSAGE
        .hIcon = Me.Icon
        .szTip = "你的小消息可以放在此..." & vbNullChar
        .dwState = 0
        .dwStateMask = 0
        .szInfo = "这是一个Balloon Style Tool-tip！又一个小技巧可以应用了       " & Chr(13) & "：）" & vbNullChar
        .uTimeoutOrVersion = 15000
        .szInfoTitle = "哈哈，看到了么" & vbNullChar
        .dwInfoFlags = NIIF_INFO
    End With

     Call Shell_NotifyIcon(NIM_ADD, nfIconData)
End Sub

Private Sub Form_Unload(Cancel As Integer)
     Call Shell_NotifyIcon(NIM_DELETE, nfIconData)
     End
End Sub

本程序代码使用Vb6 + Win2000调试通过