C# Signature:
<summary>
Sends an appbar message to the system.
<para>
Go to https://msdn.microsoft.com/en-us/library/windows/desktop/bb762108%28v=vs.85%29.aspx for more
information.
</para>
</summary>
/// <param name="dwMessage">
/// C++ ( dwMessage [in] Type: DWORD )<br />Appbar message value to send. This parameter can be one of the following
/// values.<br />
/// <list type="table">
/// <listheader>
/// <term>Possible AppBar Values</term>
/// <description>Any possible app bar value used int he function</description>
/// </listheader>
/// <item>
/// <term>ABM_NEW (0x00000000)</term>
/// <description>
/// Registers a new appbar and specifies the message identifier that the system should use to
/// send notification messages to the appbar.
/// </description>
/// </item>
/// <item>
/// <term>ABM_REMOVE (0x00000001)</term>
/// <description>Unregisters an appbar, removing the bar from the system's internal list.</description>
/// </item>
/// <item>
/// <term>ABM_QUERYPOS (0x00000002)</term>
/// <description>Requests a size and screen position for an appbar.</description>
/// </item>
/// <item>
/// <term>ABM_SETPOS (0x00000003)</term>
/// <description>Sets the size and screen position of an appbar.</description>
/// </item>
/// <item>
/// <term>ABM_GETSTATE (0x00000004)</term>
/// <description>Retrieves the autohide and always-on-top states of the Windows taskbar.</description>
/// </item>
/// <item>
/// <term>ABM_GETTASKBARPOS (0x00000005)</term>
/// <description>
/// Retrieves the bounding rectangle of the Windows taskbar. Note that this applies only to the
/// system taskbar. Other objects, particularly toolbars supplied with third-party software, also can be
/// present. As a result, some of the screen area not covered by the Windows taskbar might not be visible
/// to the user. To retrieve the area of the screen not covered by both the taskbar and other app bars—the
/// working area available to your application—, use the GetMonitorInfo function.
/// </description>
/// </item>
/// <item>
/// <term>ABM_ACTIVATE (0x00000006)</term>
/// <description>
/// Notifies the system to activate or deactivate an appbar. The lParam member of the APPBARDATA
/// pointed to by pData is set to TRUE to activate or FALSE to deactivate.
/// </description>
/// </item>
/// <item>
/// <term>ABM_GETAUTOHIDEBAR (0x00000007)</term>
/// <description>Retrieves the handle to the autohide appbar associated with a particular edge of the screen.</description>
/// </item>
/// <item>
/// <term>ABM_SETAUTOHIDEBAR (0x00000008)</term>
/// <description>Registers or unregisters an autohide appbar for an edge of the screen.</description>
/// </item>
/// <item>
/// <term>ABM_WINDOWPOSCHANGED (0x00000009)</term>
/// <description>Notifies the system when an appbar's position has changed.</description>
/// </item>
/// <item>
/// <term>ABM_SETSTATE (0x0000000A)</term>
/// <description>Windows XP and later: Sets the state of the appbar's autohide and always-on-top attributes.</description>
/// </item>
/// </list>
/// </param>
/// <param name="pData">
/// C++ ( pData [in, out] Type: PAPPBARDATA )<br /> A pointer to an APPBARDATA structure. The content
/// of the structure on entry and on exit depends on the value set in the dwMessage parameter. See the individual
/// message pages for specifics.
/// </param>
/// <returns>
/// C++ ( Type: UINT_PTR )<br />This function returns a message-dependent value. For more information, see the
/// Windows SDK documentation for thespecific appbar message sent.
/// </returns>
[DllImport("shell32.dll")]
static extern IntPtr SHAppBarMessage(uint dwMessage,
[In] ref APPBARDATA pData);
VB Signature:
<DllImport("SHELL32", CallingConvention:=CallingConvention.StdCall)> _
Shared Function SHAppBarMessage(ByVal dwMessage As Integer, ByRef pData As APPBARDATA) As Integer
End Function
User-Defined Types:
None.
Notes:
None.
Tips & Tricks:
VB Sample Class
Imports System
Imports System.Text
Imports System.Drawing
Imports System.Collections
Imports System.ComponentModel
Imports System.Timers
Imports System.Runtime.InteropServices
Public Class AppBar
#Region " Class Variablen"
Private DockSize As Size
Private MyDockForm As System.Windows.Forms.Form
Private fBarRegistered As Boolean = False
Private MyEdge As ABEdge
Friend uCallBack As Integer
Dim PosfixTimer As New System.Timers.Timer
#End Region
#Region " Structure und Enum"
<StructLayout(LayoutKind.Sequential)> _
Public Structure RECT
Public left As Integer
Public top As Integer
Public right As Integer
Public bottom As Integer
End Structure
<StructLayout(LayoutKind.Sequential)> _
Structure APPBARDATA
Public cbSize As Integer
Public hWnd As IntPtr
Public uCallbackMessage As Integer
Public uEdge As Integer
Public rc As RECT
Public lParam As Boolean
End Structure
<StructLayout(LayoutKind.Sequential)> _
Public Structure TaskbarState
Public T_EDGE As ABEdge
Public T_STATE As ABState
Public T_SIZE As RECT
End Structure
Public Enum ABMsg
ABM_NEW = 0
ABM_REMOVE = 1
ABM_QUERYPOS = 2
ABM_SETPOS = 3
ABM_GETSTATE = 4
ABM_GETTASKBARPOS = 5
ABM_ACTIVATE = 6
ABM_GETAUTOHIDEBAR = 7
ABM_SETAUTOHIDEBAR = 8
ABM_WINDOWPOSCHANGED = 9
ABM_SETSTATE = 10
End Enum
Public Enum ABState
ABS_MANUAL = &H0
ABS_AUTOHIDE = &H1
ABS_ALWAYSONTOP = &H2
ABS_AUTOHIDEANDONTOP = &H3
End Enum
Public Enum ABNotify
ABN_STATECHANGE = 0
ABN_POSCHANGED
ABN_FULLSCREENAPP
ABN_WINDOWARRANGE
End Enum
Enum ABEdge
ABE_LEFT = 0
ABE_TOP = 1
ABE_RIGHT = 2
ABE_BOTTOM = 3
End Enum
Public Enum AppBarDockStyle As Integer
None
ScreenLeft
ScreenTop
ScreenRight
ScreenBottom
End Enum
#End Region
#Region " DLLImports"
<DllImport("SHELL32", CallingConvention:=CallingConvention.StdCall)> _
Shared Function SHAppBarMessage(ByVal dwMessage As Integer, ByRef pData As APPBARDATA) As Integer
End Function
<DllImport("user32.dll")> _
Shared Function GetSystemMetrics(ByVal Index As Integer) As Integer
End Function
<DllImport("user32.dll", ExactSpelling:=True)> _
Function LockWorkStation() As Boolean
End Function
<DllImport("User32.dll", ExactSpelling:=True, CharSet:=System.Runtime.InteropServices.CharSet.Auto)> _
Private Shared Function MoveWindow(ByVal hWnd As IntPtr, ByVal x As Integer, ByVal y As Integer, ByVal cx As Integer, ByVal cy As Integer,
ByVal repaint As Boolean) As Boolean
End Function
<DllImport("User32.dll", CharSet:=CharSet.Auto)> _
Private Shared Function RegisterWindowMessage(ByVal msg As String) As Integer
End Function
Private Declare Auto Function FindWindow Lib "user32" ( ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
#End Region
#Region " Propertys"
Public ReadOnly Property IsBarRegistered() As Boolean
Get
Return fBarRegistered
End Get
End Property
Public Property AppBarDockSize() As Size
Get
Return DockSize
End Get
Set(ByVal Value As Size)
DockSize = Value
End Set
End Property
Private Property AppBarEdge() As ABEdge
Get
Return MyEdge
End Get
Set(ByVal Value As ABEdge)
MyEdge = Value
End Set
End Property
#End Region
'Constructor
Friend Sub New(ByRef DockForm As System.Windows.Forms.Form, ByVal dockStyle As AppBarDockStyle, ByVal AppBarSize As Size)
'Form Übergeben
MyDockForm = DockForm
'Dockstyles setzen
UpdateDockedAppBarPosition(dockStyle)
AppBarDockSize = AppBarSize
'Eventhandler Initialisieren
AddHandler MyDockForm.Load, AddressOf Me.OnLoad
AddHandler MyDockForm.Closing, AddressOf Me.OnClosing
End Sub
'Pos Form
Public Sub UpdateDockedAppBarPosition(ByVal dockStyle As AppBarDockStyle)
Select Case dockStyle
Case AppBarDockStyle.None : Return
Case AppBarDockStyle.ScreenLeft : AppBarEdge = ABEdge.ABE_LEFT
Case AppBarDockStyle.ScreenTop : AppBarEdge = ABEdge.ABE_TOP
Case AppBarDockStyle.ScreenRight : AppBarEdge = ABEdge.ABE_RIGHT
Case AppBarDockStyle.ScreenBottom : AppBarEdge = ABEdge.ABE_BOTTOM
Case Else : AppBarEdge = ABEdge.ABE_TOP
End Select
End Sub
'Register (ABSetPos)
Friend Sub RegisterBar(ByVal hWnd As IntPtr, ByRef uCallbackMessage As Int32, ByVal idealSize As Size, ByVal DockEdge As ABEdge)
Dim abd As APPBARDATA = New APPBARDATA
abd.cbSize = Marshal.SizeOf(abd)
abd.hWnd = hWnd
AppBarEdge = DockEdge
uCallbackMessage = RegisterWindowMessage("AppBarMessage")
abd.uCallbackMessage = uCallbackMessage
Dim ret As Long = SHAppBarMessage(CType(ABMsg.ABM_NEW, Integer), abd)
fBarRegistered = True
ABSetPos(hWnd, idealSize, DockEdge)
End Sub
'UnregAppBar
Friend Sub UnregisterAppBar(ByVal hWnd As IntPtr)
Dim abd As APPBARDATA = New APPBARDATA
abd.cbSize = Marshal.SizeOf(abd)
abd.hWnd = hWnd
SHAppBarMessage(ABMsg.ABM_REMOVE, abd)
End Sub
'Reg Form as Appbar
Friend Sub ABSetPos(ByVal hWnd As IntPtr, ByVal idealSize As Size, ByVal DockEdge As ABEdge)
Dim abd As APPBARDATA = New APPBARDATA
abd.cbSize = Marshal.SizeOf(abd)
abd.hWnd = hWnd
abd.uEdge = CType(ABEdge.ABE_TOP, Integer)
abd.uEdge = CType(DockEdge, Integer)
If abd.uEdge = CType(ABEdge.ABE_LEFT, Integer) OrElse abd.uEdge = CType(ABEdge.ABE_RIGHT, Integer) Then
abd.rc.top = 0
abd.rc.bottom = SystemInformation.PrimaryMonitorSize.Height
If abd.uEdge = CType(ABEdge.ABE_LEFT, Integer) Then
abd.rc.left = 0
abd.rc.right = idealSize.Width
Else
abd.rc.right = SystemInformation.PrimaryMonitorSize.Width
abd.rc.left = abd.rc.right - idealSize.Width
End If
Else
abd.rc.left = 0
abd.rc.right = SystemInformation.PrimaryMonitorSize.Width
If abd.uEdge = CType(ABEdge.ABE_TOP, Integer) Then
abd.rc.top = 0
abd.rc.bottom = idealSize.Height
Else
abd.rc.bottom = SystemInformation.PrimaryMonitorSize.Height
abd.rc.top = abd.rc.bottom - idealSize.Height
End If
End If
SHAppBarMessage(CType(ABMsg.ABM_QUERYPOS, Integer), abd)
Select Case abd.uEdge
Case CType(ABEdge.ABE_LEFT, Integer)
abd.rc.right = abd.rc.left + idealSize.Width
' break
Case CType(ABEdge.ABE_RIGHT, Integer)
abd.rc.left = abd.rc.right - idealSize.Width
' break
Case CType(ABEdge.ABE_TOP, Integer)
abd.rc.bottom = abd.rc.top + idealSize.Height
' break
Case CType(ABEdge.ABE_BOTTOM, Integer)
abd.rc.top = abd.rc.bottom - idealSize.Height
' break
End Select
SHAppBarMessage(CType(ABMsg.ABM_SETPOS, Integer), abd)
MoveWindow(abd.hWnd, abd.rc.left, abd.rc.top, abd.rc.right - abd.rc.left, abd.rc.bottom - abd.rc.top, True)
End Sub
Public Sub SetAutoHide()
Dim lRet As Long
Dim abd As APPBARDATA = New APPBARDATA
abd.cbSize = Marshal.SizeOf(abd)
abd.uEdge = ABEdge.ABE_RIGHT
'abd.hWnd = FindWindow("Shell_TrayWnd", "") 'Tasbar Handle
abd.hWnd = MyDockForm.Handle
abd.lParam = True
lRet = SHAppBarMessage(ABMsg.ABM_SETAUTOHIDEBAR, abd)
End Sub
Friend Function GetWinTaskbarState(ByRef WinTaskBar As TaskbarState) As Boolean
Dim hWndAppBar As Long
Dim ABD As New APPBARDATA
Dim state As Long, tsize As Long
Dim msg As New StringBuilder
Dim position As Integer
Dim retState As TaskbarState
Try
ABD.cbSize = Marshal.SizeOf(ABD)
ABD.uEdge = 0
ABD.hWnd = FindWindow("Shell_TrayWnd", "")
ABD.lParam = True
'get the appbar state
state = SHAppBarMessage(CType(ABMsg.ABM_GETSTATE, Integer), ABD)
Select Case state
Case ABState.ABS_MANUAL
retState.T_STATE = ABState.ABS_MANUAL
Case ABState.ABS_ALWAYSONTOP
retState.T_STATE = ABState.ABS_ALWAYSONTOP
Case ABState.ABS_AUTOHIDE
retState.T_STATE = ABState.ABS_AUTOHIDE
Case ABState.ABS_AUTOHIDEANDONTOP
retState.T_STATE = ABState.ABS_AUTOHIDEANDONTOP
End Select
'see which edge has a taskbar
For position = ABEdge.ABE_LEFT To ABEdge.ABE_BOTTOM
ABD.uEdge = position
hWndAppBar = SHAppBarMessage(CType(ABMsg.ABM_GETAUTOHIDEBAR, Integer), ABD)
If hWndAppBar > 0 Then
Select Case position
Case ABEdge.ABE_LEFT : retState.T_EDGE = ABEdge.ABE_LEFT
Case ABEdge.ABE_TOP : retState.T_EDGE = ABEdge.ABE_TOP
Case ABEdge.ABE_RIGHT : retState.T_EDGE = ABEdge.ABE_RIGHT
Case ABEdge.ABE_BOTTOM : retState.T_EDGE = ABEdge.ABE_BOTTOM
End Select
End If
Next
tsize = SHAppBarMessage(CType(ABMsg.ABM_GETTASKBARPOS, Integer), ABD)
retState.T_SIZE = ABD.rc
'Rückgabe ob sich der TaskbarStatus verändert hat
WinTaskBar = retState
Return True
Catch err As Exception
Trace.Assert(False)
Return False
End Try
End Function
'Eventhandler Form Load
Private Overloads Sub OnLoad(ByVal sender As Object, ByVal e As System.EventArgs)
'UpdateDockedAppBarPosition(RegisterAppBar.AppBarDockStyle.ScreenRight)
End Sub
'Eventhandler Form Close
Private Overloads Sub OnClosing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs)
UnregisterAppBar(MyDockForm.Handle)
End Sub
End Class
Sample Code:
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