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Add an icon to the system tray, and recognize when the icon is clicked or hoovered over

Add an icon to the system tray, and recognize when the icon is clicked or hoovered over

API Declarations


'function.
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

'Declare the constants for the API function. These constants can be
'found in the header file Shellapi.h.

'The following constants are the messages sent to the
'Shell_NotifyIcon function to add, modify, or delete an icon from the
'taskbar status area.
Private Const NIM_ADD = &H0
Private Const NIM_MODIFY = &H1
Private Const NIM_DELETE = &H2

'The following constant is the message sent when a mouse event occurs
'within the rectangular boundaries of the icon in the taskbar status
'area.
Private Const WM_MOUSEMOVE = &H200

'The following constants are the flags that indicate the valid
'members of the NOTIFYICONDATA data type.
Private Const NIF_MESSAGE = &H1
Private Const NIF_ICON = &H2
Private Const NIF_TIP = &H4

'The following constants are used to determine the mouse input on the
'the icon in the taskbar status area.

'Left-click constants.
Private Const WM_LBUTTONDBLCLK = &H203 'Double-click
Private Const WM_LBUTTONDOWN = &H201 'Button down
Private Const WM_LBUTTONUP = &H202 'Button up

'Right-click constants.
Private Const WM_RBUTTONDBLCLK = &H206 'Double-click
Private Const WM_RBUTTONDOWN = &H204 'Button down
Private Const WM_RBUTTONUP = &H205 'Button up

'Declare the API function call.
Private Declare Function Shell_NotifyIcon Lib "shell32" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, pnid As NOTIFYICONDATA) As Boolean

'Dimension a variable as the user-defined data type.
Dim nid As NOTIFYICONDATA



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' add a commond dialog control named CommonDialog1
' add two command buttons named Command1 and Command2

Private Sub Command1_Click()
   'Click this button to add an icon to the taskbar status area.

   'Set the individual values of the NOTIFYICONDATA data type.
   nid.cbSize = Len(nid)
   nid.hWnd = Form1.hWnd
   nid.uId = vbNull
   nid.uFlags = NIF_ICON Or NIF_TIP Or NIF_MESSAGE
   nid.uCallBackMessage = WM_MOUSEMOVE
   nid.hIcon = Form1.Icon
   nid.szTip = "Taskbar Status Area Sample Program" & vbNullChar

   'Call the Shell_NotifyIcon function to add the icon to the taskbar
   'status area.
   Shell_NotifyIcon NIM_ADD, nid
End Sub

Private Sub Command2_Click()
   'Click this button to delete the added icon from the taskbar
   'status area by calling the Shell_NotifyIcon function.
   Shell_NotifyIcon NIM_DELETE, nid
End Sub

Private Sub Form_Load()
   'Set the captions of the command button when the form loads.
   Command1.Caption = "Add an Icon"
   Command2.Caption = "Delete Icon"
End Sub

Private Sub Form_Terminate()
   'Delete the added icon from the taskbar status area when the
   'program ends.
   Shell_NotifyIcon NIM_DELETE, nid
End Sub

Private Sub Form_MouseMove _
   (Button As Integer, _
    Shift As Integer, _
    X As Single, _
    Y As Single)
    'Event occurs when the mouse pointer is within the rectangular
    'boundaries of the icon in the taskbar status area.
    Dim msg As Long
    Dim sFilter As String
    msg = X / Screen.TwipsPerPixelX
    Select Case msg
       Case WM_LBUTTONDOWN
       Case WM_LBUTTONUP
       Case WM_LBUTTONDBLCLK
       CommonDialog1.DialogTitle = "Select an Icon"
       sFilter = "Icon Files (*.ico)|*.ico"
       sFilter = sFilter & "|All Files (*.*)|*.*"
       CommonDialog1.Filter = sFilter
       CommonDialog1.ShowOpen
       If CommonDialog1.FileName <> "" Then
          Form1.Icon = LoadPicture(CommonDialog1.FileName)
          nid.hIcon = Form1.Icon
          Shell_NotifyIcon NIM_MODIFY, nid
       End If
       Case WM_RBUTTONDOWN
          Dim ToolTipString As String
          ToolTipString = InputBox("Enter the new ToolTip:", "Change ToolTip")
          If ToolTipString <> "" Then
             nid.szTip = ToolTipString & vbNullChar
             Shell_NotifyIcon NIM_MODIFY, nid
          End If
       Case WM_RBUTTONUP
       Case WM_RBUTTONDBLCLK
    End Select
End Sub