windows-xp/Source/XPSP1/NT/admin/activec/designer/samples/comdetect/comdetect.dsr

VERSION 5.00
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Attribute VB_Name = "ComDetect"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
Option Explicit


'  ===========================================================================
' |    THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF      |
' |    ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO    |
' |    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A         |
' |    PARTICULAR PURPOSE.                                                    |
' |    Copyright (c) 1998-1999  Microsoft Corporation                              |
'  ===========================================================================


' =============================================================================
' File:         ComDetect.dsr
' Project:      ComDetectProj
' Type:         SnapIn Designer
' =============================================================================

' Declare Windows API functions needed to check for DllRegisterServer export

Private Declare Function LoadLibrary Lib "kernel32.dll" Alias "LoadLibraryA" (ByVal Path As String) As Long
Private Declare Function GetProcAddress Lib "kernel32.dll" (ByVal hModule As Long, ByVal ProcName As String) As Long
Private Declare Function FreeLibrary Lib "kernel32.dll" (ByVal hModule As Long)


' =============================================================================
' Method:       ExtensionSnapIn_AddTaskMenuItems
' Type:         Event
' Description:  Fired when a context menu is about to be displayed to give the
'               extension snap-in the opportunity to add items to MMC's "Task"
'               sub-menu.
'
' Parameters:   DataObjects     An MMCDataObject collection that contains the
'                               current selection. The extension snap-in must
'                               interpret the data exported by the extended
'                               snap-ins (in this case FileExplorer exports the
'                               data)
'               ContextMenu     A ContextMenu object that allows adding the
'                               snap-in's menus.
' Output:       None
' Notes:        Adds mnuDetect containing the "Is this file a COM server..."
'               item.
' =============================================================================
'
Private Sub ExtensionSnapIn_AddTaskMenuItems(ByVal DataObjects As SnapInLib.IMMCDataObjects, _
                                             ByVal ContextMenu As SnapInLib.IContextMenu)

    On Error GoTo ErrTrap_ExtensionSnapIn_AddTaskMenuItems

    Dim strPath As String
    Dim varPath As Variant

    ' If there is anything other than a single data object then we ignore it
    ' as FileExplorer exports one MMCDataObject with the format "Path" when the
    ' selected item is a single file.

    If DataObjects.Count <> 1 Then
        Exit Sub
    End If
    
    ' Extract the file's path from the data object. Note that we cannot
    ' just assign the Variant returned from MMCDataObject.GetData to a string
    ' because it will contain an array of bytes terminated by multiple zero
    ' bytes. This is due to the way the runtime must convert the exported string
    ' from FileExplorer to a raw memory block of bytes that can be imported by
    ' other snap-ins. If we did the straight assignment and then concatenated
    ' another string to the path, certain functions (e.g.MsgBox) would truncate
    ' the concatenated string due to the embedded zero bytes.

    ' To solve this problem we use the designer's FormatData method that can
    ' convert from a byte array to different data types.
    
    varPath = DataObjects(1).GetData("Path")
    strPath = FormatData(varPath, 1, siString)

    ' Set the IsComServer menu item's tag to the DLL's path. If the menu item
    ' is clicked, the event handler will get the path from the tag.

    IsCOMServer.Tag = strPath

    ' Add mnuDetect containing the "Is this file a COM server..." item.

    ContextMenu.AddMenu mnuDetect

    Exit Sub

' Error Handler for this method
ErrTrap_ExtensionSnapIn_AddTaskMenuItems:
    DisplayError "ExtensionSnapIn_AddTaskMenuItems"

End Sub

' =============================================================================
' Method:       IsCOMServer_Click
' Type:         Event
' Description:  Fired when the "Is this file a COM server..." context menu item
'               is selected.
'
' Parameters:   Index       This will always be 1 as we are directly handling
'                           the event on the individual menu item rather than
'                           the event on its parent.
'                Selection  A reference to an MMCClipboard object that is
'                           holding a reference to the currently selected
'                           item(s). Note that even though the selection is
'                           held in an MMCClipboard object, its ScopeItems and
'                           ListItems collection will always be empty in an
'                           extension snap-in because the selected items(s)
'                           belong to the extended snap-in (FileExplorer in
'                           this case). The extension snap-in must interpret
'                           the exported data in MMCClipboard.DataObjects.
' Output:       None
' Notes:        Gets the path from the MMCMenu object's Tag property and uses
'               Win32 API calls to determine if the file exports
'               "DllRegisterServer".
' =============================================================================
'
Private Sub IsCOMServer_Click(ByVal Index As Long, ByVal Selection As SnapInLib.IMMCClipboard)
    
    On Error GoTo ErrTrap_ExtensionSnapIn_IsCOMServer_Click

    Dim hModule As Long
    Dim ProcAddr As Long
    Dim IsOrNot As String
   
    hModule = LoadLibrary(IsCOMServer.Tag)
    If hModule <> 0 Then
        ProcAddr = GetProcAddress(hModule, "DllRegisterServer")
        If ProcAddr <> 0 Then
            IsOrNot = " is "
        Else
            IsOrNot = " is not "
        End If
        MsgBox IsCOMServer.Tag & IsOrNot & "a COM server.", _
               vbOKOnly, "ComDetect Extension"
        FreeLibrary hModule
    Else
        MsgBox "Error loading " & IsCOMServer.Tag, vbOKOnly, "ComDetect"
    End If

    Exit Sub

' Error Handler for this method
ErrTrap_ExtensionSnapIn_IsCOMServer_Click:
    DisplayError "ExtensionSnapIn_IsCOMServer_Click"

End Sub

' =============================================================================
' Method:       DisplayError
' Type:         Subroutine
' Description:  A method to format and display a runtime error
' Parameters:   szLocation      A string identifying the source location
'                               (i.e. method name) where the error occurred
' Output:       None
' Notes:        The error will be displayed in a messagebox formatted as the
'               following sample:
'
'     Method:        SomeMethodName
'     Source:        MMCListSubItems
'     Error:         2527h  (9511)
'     Description:   There is already an item in the collection that has the specified key
'
' =============================================================================
'
Private Sub DisplayError(szLocation As String)
    
    ' Note that as an extension snap-in we do not have access to the
    ' ConsoleMsgBox method so we need to use a VB message box.

    MsgBox "Method:" & vbTab & vbTab & szLocation & vbCrLf _
           & "Source:" & vbTab & vbTab & Err.Source & vbCrLf _
           & "Error:" & vbTab & vbTab & Hex(Err.Number) & "h   (" & CStr(Err.Number) & ")" & vbCrLf _
           & "Description:" & vbTab & Err.Description, _
           vbCritical, "ComDetect Runtime Error"
End Sub