VB编写托盘图标实例

VB编写托盘图标有两个要点，一是使用 Shell_NotifyIcon 函数显示图标；二是向系统注册 TaskbarCreated 消息，以便explorer崩溃时恢复托盘的图标。
首先需要增加一个模块文件，内容如下：
Public Declare Function Shell_NotifyIcon Lib "shell32.dll" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, lpData As NOTIFYICONDATA) As Long
Public nfIconData As NOTIFYICONDATA
Public Const MAX_TOOLTIP As Integer = 64
' uFlags to NOTIFYICONDATA structure
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
' dwMessage to Shell_NotifyIcon
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 WM_MOUSEMOVE = &H200 '当鼠标指针移至图标上
Public Const WM_LBUTTONDOWN = &H201 '鼠标左键按下
Public Const WM_LBUTTONUP = &H202 '鼠标左键弹起
Public Const WM_LBUTTONDBLCLK = &H203
Public Const WM_RBUTTONDOWN = &H204 '鼠标右键按下
Public Const WM_RBUTTONUP = &H205 '鼠标右键弹起
Public Const WM_RBUTTONDBLCLK = &H206
Public Const SW_RESTORE = 9
Public Const SW_HIDE = 0
Public Type NOTIFYICONDATA
cbSize As Long ' 结构大小(字节)
hwnd As Long ' 处理消息的窗口的句柄
uId As Long ' 唯一的标识符
uFlags As Long ' Flags
uCallBackMessage As Long ' 处理消息的窗口接收的消息
hIcon As Long ' 托盘图标句柄
szTip As String * 128 ' Tooltip 提示文本
dwState As Long ' 托盘图标状态
dwStateMask As Long ' 状态掩码
szInfo As String * 256 ' 气球提示文本
uTimeoutOrVersion As Long ' 气球提示消失时间或版本
' uTimeout - 气球提示消失时间(单位:ms, 10000 -- 30000)
' uVersion - 版本(0 for V4,