mdialoghook.bas

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Attribute VB_Name = "mDialogHook"
Option Explicit

' ==========================================================================
' Module:   mDialogHook
' Filename: mDialogHook.bas
' Author:   Steve McMahon
' Date:     24 May 1998
'
' Provides functions which can be called via AddressOf for common
' dialog hook support.
' ==========================================================================
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
    lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)

Private m_cHookedDialog As Long

Property Let HookedDialog(ByRef cThis As GCommonDialog)
    'Set cHookedDialog = cThis
    m_cHookedDialog = ObjPtr(cThis)
End Property
Property Get HookedDialog() As GCommonDialog
Dim oT As GCommonDialog
    If (m_cHookedDialog <> 0) Then
        ' Turn the pointer into an illegal, uncounted interface
        CopyMemory oT, m_cHookedDialog, 4
        ' Do NOT hit the End button here! You will crash!
        ' Assign to legal reference
        Set HookedDialog = oT
        ' Still do NOT hit the End button here! You will still crash!
        ' Destroy the illegal reference
        CopyMemory oT, 0&, 4
    End If
End Property
Public Sub ClearHookedDialog()
    m_cHookedDialog = 0
End Sub
Public Function DialogHookFunction(ByVal hDlg As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim cD As GCommonDialog
    Set cD = HookedDialog
    If Not (cD Is Nothing) Then
        DialogHookFunction = cD.DialogHook(hDlg, msg, wParam, lParam)
    End If
End Function
Public Function PrintHookProc(ByVal hDlg As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim cD As GCommonDialog
    Set cD = HookedDialog
    If Not (cD Is Nothing) Then
        PrintHookProc = cD.DialogHook(hDlg, msg, wParam, lParam)
    End If
End Function
Public Function PrintSetupHookProc(ByVal hDlg As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim cD As GCommonDialog
    Set cD = HookedDialog
    If Not (cD Is Nothing) Then
        PrintSetupHookProc = cD.DialogHook(hDlg, msg, wParam, lParam)
    End If
End Function

Public Function PageSetupHook(ByVal hDlg As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim cD As GCommonDialog
    Set cD = HookedDialog
    If Not (cD Is Nothing) Then
        PageSetupHook = cD.DialogHook(hDlg, msg, wParam, lParam)
    End If
End Function
Public Function CCHookProc(ByVal hDlg As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim cD As GCommonDialog
    Set cD = HookedDialog
    If Not (cD Is Nothing) Then
        CCHookProc = cD.DialogHook(hDlg, msg, wParam, lParam)
    End If

End Function
Public Function CFHookProc(ByVal hDlg As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim cD As GCommonDialog
    Set cD = HookedDialog
    If Not (cD Is Nothing) Then
        CFHookProc = cD.DialogHook(hDlg, msg, wParam, lParam)
    End If
End Function