CodeGuru: Using the System Tray

CodeGuru: Using the System Tray:

Option Explicit

' Type passed to Shell_NotifyIcon
Private Type NotifyIconData
Size As Long
Handle As Long
ID As Long
Flags As Long
CallBackMessage As Long
Icon As Long
Tip As String * 64
End Type

' Constants for managing System Tray tasks, foudn in shellapi.h
Private Const AddIcon = &H0
Private Const ModifyIcon = &H1
Private Const DeleteIcon = &H2

Private Const WM_MOUSEMOVE = &H200
Private Const WM_LBUTTONDBLCLK = &H203
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_LBUTTONUP = &H202

Private Const WM_RBUTTONDBLCLK = &H206
Private Const WM_RBUTTONDOWN = &H204
Private Const WM_RBUTTONUP = &H205

Private Const MessageFlag = &H1
Private Const IconFlag = &H2
Private Const TipFlag = &H4

Private Declare Function Shell_NotifyIcon _
Lib "shell32" Alias "Shell_NotifyIconA" ( _
ByVal Message As Long, Data As NotifyIconData) As Boolean

Private Data As NotifyIconData


Private Sub Form_Load()
AddIconToTray
Visible = False
End Sub

Private Sub Form_Terminate()
DeleteIconFromTray
End Sub

Private Sub AddIconToTray()

Data.Size = Len(Data)
Data.Handle = hWnd
Data.ID = vbNull
Data.Flags = IconFlag Or TipFlag Or MessageFlag
Data.CallBackMessage = WM_MOUSEMOVE
Data.Icon = Icon
Data.Tip = "System Tray Demo - codeguru.com" & vbNullChar
Call Shell_NotifyIcon(AddIcon, Data)

End Sub

Private Sub DeleteIconFromTray()
Call Shell_NotifyIcon(DeleteIcon, Data)
End Sub

Private Sub Form_MouseMove(Button As Integer, _
Shift As Integer, X As Single, Y As Single)

Dim Message As Long
Message = X / Screen.TwipsPerPixelX

Select Case Message
Case WM_LBUTTONDBLCLK
Visible = Not Visible
WindowState = Abs(Not Visible)
End Select
End Sub