System Tray problem...easy answer, I hope.

[Roland_Foxx]

When you're filling out the structure to use with Shell_NotifyIcon, it asks for a handle to the window the callback message will be sent back to and a handle or pointer to the callback function. To catch that message, do I need to subclass the window, or is there a simpler (and less dangerous) way to do this?

[jim mcnamara]

No.

Sample code from allapi.net:

'Download the full source+pictures+... at http://kpdteam.hypermart.net/download/tray.zip
Private Type NOTIFYICONDATA
    cbSize As Long
    hWnd As Long
    uId As Long
    uFlags As Long
    ucallbackMessage As Long
    hIcon As Long
    szTip As String * 64
End Type

Private Const NIM_ADD = &H0
Private Const NIM_MODIFY = &H1
Private Const NIM_DELETE = &H2
Private Const NIF_MESSAGE = &H1
Private Const NIF_ICON = &H2
Private Const NIF_TIP = &H4

Private Const WM_LBUTTONDBLCLK = &H203
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_RBUTTONUP = &H205

Private Declare Function Shell_NotifyIcon Lib "shell32" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, pnid As NOTIFYICONDATA) As Boolean
Dim TrayI As NOTIFYICONDATA
Private Sub Form_Load()
    TrayI.cbSize = Len(TrayI)
    'Set the window's handle (this will be used to hook the specified window)
    TrayI.hWnd = pichook.hWnd
    'Application-defined identifier of the taskbar icon
    TrayI.uId = 1&
    'Set the flags
    TrayI.uFlags = NIF_ICON Or NIF_TIP Or NIF_MESSAGE
    'Set the callback message
    TrayI.ucallbackMessage = WM_LBUTTONDOWN
    'Set the picture (must be an icon!)
    TrayI.hIcon = imgIcon(2).Picture
    'Set the tooltiptext
    TrayI.szTip = "Recent" & Chr$(0)
    'Create the icon
    Shell_NotifyIcon NIM_ADD, TrayI

    Me.Hide
End Sub
Private Sub Form_Unload(Cancel As Integer)
    'remove the icon
    TrayI.cbSize = Len(TrayI)
    TrayI.hWnd = pichook.hWnd
    TrayI.uId = 1&
    Shell_NotifyIcon NIM_DELETE, TrayI
    End
End Sub
Private Sub mnuPop_Click(Index As Integer)
    Select Case Index
        Case 0
            MsgBox "KPD-Team 1998" + Chr$(13) + "URL: http://www.allapi.net/" + Chr$(13) + "E-Mail: [email protected]", vbInformation + vbOKOnly
        Case 2
            Unload Me
    End Select
End Sub
Private Sub pichook_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Msg = X / Screen.TwipsPerPixelX
    If Msg = WM_LBUTTONDBLCLK Then
        'Left button double click
        mnuPop_Click 0
    ElseIf Msg = WM_RBUTTONUP Then
        'Right button click
        Me.PopupMenu mnuPopUp
    End If
End Sub
Private Sub Timer1_Timer()
    Static Tek As Integer
    'Animate the icon
    Me.Icon = imgIcon(Tek).Picture
    TrayI.hIcon = imgIcon(Tek).Picture
    Tek = Tek + 1
    If Tek = 3 Then Tek = 0
    Shell_NotifyIcon NIM_MODIFY, TrayI
End Sub