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使用VB编写在托盘上显示Balloon提示的功能就需要调用Win32Api了，但是VB6和VB.NET代码上还是有些不同的，红色部分即为二者区别
Imports System.Runtime.InteropServices
Public Class Form1
Inherits System.Windows.Forms.Form
#Region "Win32Api_NotifyIcon"
Private Declare Function Shell_NotifyIcon Lib "shell32.dll" Alias _
"Shell_NotifyIconA" (ByVal dwMessage As Int32, _
ByRef lpData As NOTIFYICONDATA) As Int32
<System.Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Sequential)> Private Structure NOTIFYICONDATA
Public cbSize As Int32
Public hwnd As IntPtr
Public uId As Int32
Public uFlags As Int32
Public uCallBackMessage As Int32
Public hIcon As IntPtr
<MarshalAs(UnmanagedType.ByValTStr, sizeconst:=128)> _
Public szTip As String
Public dwState As Int32
Public dwStateMask As Int32
<MarshalAs(UnmanagedType.ByValTStr, sizeconst:=256)> _
Public szInfo As String
Public uTimeoutOrVersion As Int32
<MarshalAs(UnmanagedType.ByValTStr, sizeconst:=64)> _
Public szInfoTitle As String
Public dwInfoFlags As Int32
End Structure
Private Const NOTIFYICON_VERSION = 3
Private Const NOTIFYICON_OLDVERSION = 0
Private Const NIM_ADD = &H0
Private Const NIM_MODIFY = &H1
Private Const NIM_DELETE = &H2
Private Const NIM_SETFOCUS = &H3
Private Const NIM_SETVERSION = &H4
Private Const NIF_MESSAGE = &H1
Private Const NIF_ICON = &H2
Private Const NIF_TIP = &H4
Private Const NIF_STATE = &H8
Private Const NIF_INFO = &H10
Private Const NIS_HIDDEN = &H1
Private Const NIS_SHAREDICON = &H2
Private Const NIIF_NONE = &H0
Private Const NIIF_WARNING = &H2
Private Const NIIF_ERROR = &H3
Private Const NIIF_INFO = &H1
Private nfIconData As NOTIFYICONDATA
#End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
nfIconData = New NOTIFYICONDATA()
With nfIconData
.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(nfIconData)
.hwnd = Me.Handle
.uId = vbNull
.uFlags = NIF_INFO Or NIF_ICON Or NIF_TIP Or NIF_MESSAGE
.hIcon = Me.Icon.Handle
.szTip = "123" ''''& Microsoft.VisualBasic.vbNullChar
.dwState = 0
.dwStateMask = 0
.szInfo = "Balloon Style Tool-tip" & Chr(13) & "哈哈" ''''& vbNullChar
.uTimeoutOrVersion = 15000
.szInfoTitle = "看到了么?" ''''& Microsoft.VisualBasic.vbNullChar
.dwInfoFlags = NIIF_INFO
End With
Call Shell_NotifyIcon(NIM_ADD, nfIconData)
End Sub
Private Sub Form1_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed
Call Shell_NotifyIcon(NIM_DELETE, nfIconData)
End Sub
End Class
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