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'Map zData() to the thunk address for the specified window handle
Private Function zMap_VFunction(ByVal vFuncTarget As Long, vType As eThunkType) As Long
' vFuncTarget is one of the following, depending on vType
' - Subclassing: the hWnd of the window subclassed
' - Hooking: the hook type created
' - Callbacks: the ordinal of the callback
Dim thunkCol As Collection
If vType = CallbackThunk Then
Set thunkCol = z_cbFunk
ElseIf vType = HookThunk Then
Set thunkCol = z_hkFunk
ElseIf vType = SubclassThunk Then
Set thunkCol = z_scFunk
Else
zError "zMap_Vfunction", "Invalid thunk type passed"
Exit Function
End If
If thunkCol Is Nothing Then
zError "zMap_VFunction", "Thunk hasn't been initialized"
Else
On Error GoTo Catch
z_ScMem = thunkCol("h" & vFuncTarget) 'Get the thunk address
zMap_VFunction = z_ScMem
End If
Exit Function 'Exit returning the thunk address
Catch:
zError "zMap_VFunction", "Thunk type for ID of " & vFuncTarget & " does not exist"
End Function
'Error handler
Private Sub zError(ByVal sRoutine As String, ByVal sMsg As String)
' \\LaVolpe - Note. These two lines can be rem'd out if you so desire. But don't remove the routine
App.LogEvent TypeName(Me) & "." & sRoutine & ": " & sMsg, vbLogEventTypeError
MsgBox sMsg & ".", vbExclamation + vbApplicationModal, "Error in " & TypeName(Me) & "." & sRoutine
End Sub
'Return the address of the specified DLL/procedure
Private Function zFnAddr(ByVal sDLL As String, ByVal sProc As String, ByVal asUnicode As Boolean) As Long
If asUnicode Then
zFnAddr = GetProcAddress(GetModuleHandleW(StrPtr(sDLL)), sProc) 'Get the specified procedure address
Else
zFnAddr = GetProcAddress(GetModuleHandleA(sDLL), sProc) 'Get the specified procedure address
End If
Debug.Assert zFnAddr 'In the IDE, validate that the procedure address was located
' ^^ FYI VB5 users. Search for zFnAddr("vba6", "EbMode") and replace with zFnAddr("vba5", "EbMode")
End Function
'Return the address of the specified ordinal method on the oCallback object, 1 = last private method, 2 = second last private method, etc
Private Function zAddressOf(ByVal oCallback As Object, ByVal nOrdinal As Long) As Long
' Note: used both in subclassing and hooking routines
Dim bSub As Byte 'Value we expect to find pointed at by a vTable method entry
Dim bVal As Byte
Dim nAddr As Long 'Address of the vTable
Dim i As Long 'Loop index
Dim j As Long 'Loop limit
RtlMoveMemory VarPtr(nAddr), ObjPtr(oCallback), 4 'Get the address of the callback object's instance
If Not zProbe(nAddr + &H1C, i, bSub) Then 'Probe for a Class method
If Not zProbe(nAddr + &H6F8, i, bSub) Then 'Probe for a Form method
' \\LaVolpe - Added propertypage offset
If Not zProbe(nAddr + &H710, i, bSub) Then 'Probe for a PropertyPage method
If Not zProbe(nAddr + &H7A4, i, bSub) Then 'Probe for a UserControl method
Exit Function 'Bail...
End If
End If
End If
End If
i = i + 4 'Bump to the next entry
j = i + 1024 'Set a reasonable limit, scan 256 vTable entries
Do While i < j
RtlMoveMemory VarPtr(nAddr), i, 4 'Get the address stored in this vTable entry
If IsBadCodePtr(nAddr) Then 'Is the entry an invalid code address?
RtlMoveMemory VarPtr(zAddressOf), i - (nOrdinal * 4), 4 'Return the specified vTable entry address
Exit Do 'Bad method signature, quit loop
End If
RtlMoveMemory VarPtr(bVal), nAddr, 1 'Get the byte pointed to by the vTable entry
If bVal <> bSub Then 'If the byte doesn't match the expected value...
RtlMoveMemory VarPtr(zAddressOf), i - (nOrdinal * 4), 4 'Return the specified vTable entry address
Exit Do 'Bad method signature, quit loop
End If
i = i + 4 'Next vTable entry
Loop
End Function
'Probe at the specified start address for a method signature
Private Function zProbe(ByVal nStart As Long, ByRef nMethod As Long, ByRef bSub As Byte) As Boolean
Dim bVal As Byte
Dim nAddr As Long
Dim nLimit As Long
Dim nEntry As Long
nAddr = nStart 'Start address
nLimit = nAddr + 32 'Probe eight entries
Do While nAddr < nLimit 'While we've not reached our probe depth
RtlMoveMemory VarPtr(nEntry), nAddr, 4 'Get the vTable entry
If nEntry <> 0 Then 'If not an implemented interface
RtlMoveMemory VarPtr(bVal), nEntry, 1 'Get the value pointed at by the vTable entry
If bVal = &H33 Or bVal = &HE9 Then 'Check for a native or pcode method signature
nMethod = nAddr 'Store the vTable entry
bSub = bVal 'Store the found method signature
zProbe = True 'Indicate success
Exit Do 'Return
End If
End If
nAddr = nAddr + 4 'Next vTable entry
Loop
End Function
Private Function zInIDE() As Long
' This is only run in IDE; it is never run when compiled
z_IDEflag = 1
zInIDE = z_IDEflag
End Function
Private Property Get zData(ByVal nIndex As Long) As Long
' retrieves stored value from virtual function's memory location
RtlMoveMemory VarPtr(zData), z_ScMem + (nIndex * 4), 4
End Property
Private Property Let zData(ByVal nIndex As Long, ByVal nValue As Long)
' sets value in virtual function's memory location
RtlMoveMemory z_ScMem + (nIndex * 4), VarPtr(nValue), 4
End Property
Private Sub zUnThunk(ByVal thunkID As Long, ByVal vType As eThunkType)
' Releases a specific subclass, hook or callback
' thunkID depends on vType:
' - Subclassing: the hWnd of the window subclassed
' - Hooking: the hook type created
' - Callbacks: the ordinal of the callback
Const IDX_SHUTDOWN As Long = 1
Const MEM_RELEASE As Long = &H8000& 'Release allocated memory flag
If zMap_VFunction(thunkID, vType) Then
Select Case vType
Case SubclassThunk
If IsBadCodePtr(z_ScMem) = 0 Then 'Ensure that the thunk hasn't already released its memory
zData(IDX_SHUTDOWN) = 1 'Set the shutdown indicator
zDelMsg ALL_MESSAGES, IDX_BTABLE 'Delete all before messages
zDelMsg ALL_MESSAGES, IDX_ATABLE 'Delete all after messages
'\\LaVolpe - Force thunks to replace original window procedure handle. Without this, app can crash when a window is subclassed multiple times simultaneously
If zData(IDX_UNICODE) Then 'Force window procedure handle to be replaced
SendMessageW thunkID, 0&, 0&, ByVal 0&
Else
SendMessageA thunkID, 0&, 0&, ByVal 0&
End If
End If
z_scFunk.Remove "h" & thunkID 'Remove the specified thunk from the collection
Case HookThunk
If IsBadCodePtr(z_ScMem) = 0 Then 'Ensure that the thunk hasn't already released its memory
zData(IDX_SHUTDOWN) = 1 'Set the shutdown indicator
zData(IDX_ATABLE) = 0 ' want no more After messages
zData(IDX_BTABLE) = 0 ' want no more Before messages
End If
z_hkFunk.Remove "h" & thunkID 'Remove the specified thunk from the collection
Case CallbackThunk
If IsBadCodePtr(z_ScMem) = 0 Then 'Ensure that the thunk hasn't already released its memory
VirtualFree z_ScMem, 0, MEM_RELEASE 'Release allocated memory
End If
z_cbFunk.Remove "h" & thunkID 'Remove the specified thunk from the collection
End Select
End If
End Sub
Private Sub zTerminateThunks(ByVal vType As eThunkType)
' Removes all thunks of a specific type: subclassing, hooking or callbacks
Dim i As Long
Dim thunkCol As Collection
Select Case vType
Case SubclassThunk
Set thunkCol = z_scFunk
Case HookThunk
Set thunkCol = z_hkFunk
Case CallbackThunk
Set thunkCol = z_cbFunk
Case Else
Exit Sub
End Select
If Not (thunkCol Is Nothing) Then 'Ensure that hooking has been started
With thunkCol
For i = .Count To 1 Step -1 'Loop through the collection of hook types in reverse order
z_ScMem = .Item(i) 'Get the thunk address
If IsBadCodePtr(z_ScMem) = 0 Then 'Ensure that the thunk hasn't already released its memory
Select Case vType
Case SubclassThunk
zUnThunk zData(IDX_INDEX), SubclassThunk 'Unsubclass
Case HookThunk
zUnThunk zData(IDX_INDEX), HookThunk 'Unhook
Case CallbackThunk
zUnThunk zData(IDX_CALLBACKORDINAL), CallbackThunk ' release callback
End Select
End If
Next i 'Next member of the collection
End With
Set thunkCol = Nothing 'Destroy the hook/thunk-address collection
End If
End Sub
Private Function GetDriveBusType(ByVal sDrive As String) As STORAGE_BUS_TYPE
Dim lret As Long
Dim lDevice As Long
Dim tSTORAGE_DEVICE_DESCRIPTOR As STORAGE_DEVICE_DESCRIPTOR
Dim tOVERLAPPED As OVERLAPPED
Dim tSTORAGE_PROPERTY_QUERY As STORAGE_PROPERTY_QUERY
sDrive = Left(sDrive, 1) & ":"
lDevice = CreateFile("\\.\" & sDrive, GENERIC_READ, _
FILE_SHARE_READ Or FILE_SHARE_WRITE, ByVal 0&, OPEN_EXISTING, 0, 0)
If Not lDevice = INVALID_HANDLE_VALUE Then
With tSTORAGE_PROPERTY_QUERY
.PropertyId = StorageDeviceProperty
.QueryType = PropertyStandardQuery
End With
Call DeviceIoControl(lDevice, _
IOCTL_STORAGE_QUERY_PROPERTY, _
tSTORAGE_PROPERTY_QUERY, _
LenB(tSTORAGE_PROPERTY_QUERY), _
tSTORAGE_DEVICE_DESCRIPTOR, _
LenB(tSTORAGE_DEVICE_DESCRIPTOR), _
lret, tOVERLAPPED)
GetDriveBusType = tSTORAGE_DEVICE_DESCRIPTOR.BusType
Call CloseHandle(lDevice)
End If
End Function
Private Function IOCTL_STORAGE_QUERY_PROPERTY() As Long
IOCTL_STORAGE_QUERY_PROPERTY = _
(IOCTL_STORAGE_BASE * 2 ^ 16) Or _
(FILE_ANY_ACCESS * 2 ^ 14) Or _
(&H500 * 2 ^ 2) Or _
(METHOD_BUFFERED)
End Function
Private Function UnitFromMask(ByVal lMask As Long) As String
Dim i As Long
For i = 0 To 25
If (lMask And 2 ^ i) Then
UnitFromMask = Chr$(i + Asc("A"))
Exit Function
End If
Next
End Function
'- ordinal #1
Private Sub WndProc( _
ByVal bBefore As Boolean, _
ByRef bHandled As Boolean, _
ByRef lReturn As Long, _
ByVal lng_hWnd As Long, _
ByVal uMsg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long, _
ByRef lParamUser As Long)
Dim tDEV_BROADCAST_HDR As DEV_BROADCAST_HDR
Dim tDEV_BROADCAST_VOLUME As DEV_BROADCAST_VOLUME
Dim sDrive As String
Select Case wParam
Case DBT_DEVICEARRIVAL, DBT_DEVICEREMOVECOMPLETE
Call CopyMemory(tDEV_BROADCAST_HDR, _
ByVal lParam, LenB(tDEV_BROADCAST_HDR))
If tDEV_BROADCAST_HDR.dbch_devicetype = DBT_DEVTYP_VOLUME Then
Call CopyMemory(tDEV_BROADCAST_VOLUME, _
ByVal lParam, LenB(tDEV_BROADCAST_VOLUME))
sDrive = UnitFromMask(tDEV_BROADCAST_VOLUME.dbcv_unitmask)
If Not sDrive = vbNullString Then
If wParam = DBT_DEVICEARRIVAL Then
If GetDriveBusType(sDrive) = BusTypeUsb Then
RaiseEvent DriveArrival(sDrive, GetDriveType(sDrive & ":\"))
End If
Else
RaiseEvent DriveRemoval(sDrive)
End If
End If
End If
End Select
End Sub
' *************************************************************
' C A U T I O N C A U T I O N C A U T I O N C A U T I O N
' -------------------------------------------------------------
' DO NOT ADD ANY OTHER CODE BELOW THE "END SUB" STATEMENT BELOW
' add this warning banner to the last routine in your class
' *************************************************************
MsgBox "Detectada ", sDrive, lDriveType
MsgBox "Extraída ", sDrive
'---------------------------------------------------------------------------------------
' Module : cUSB_Detection
' DateTime : 19/06/2008 18:17
' Author : Cobein
' Mail : cobein27@hotmail.com
' WebPage : http://cobein27.googlepages.com/vb6
' Purpose : Simple USB device detection
' Usage : At your own risk
' Requirements: None
' Distribution: You can freely use this code in your own
' applications, but you may not reproduce
' or publish this code on any web site,
' online service, or distribute as source
' on any media without express permission.
'
' Reference : http://msdn.microsoft.com/en-us/library/aa363205(VS.85).aspx
'
' TODO : Expand capabilities to support all WM_DEVICECHANGE message params and types
'
' Important : The class is pre-filtering drives by bustype = USB
'
' History : 19/06/2008 First Cut....................................................
'---------------------------------------------------------------------------------------
Option Explicit
Private Const IDX_INDEX As Long = 2 'index of the subclassed hWnd OR hook type
Private Const IDX_CALLBACKORDINAL As Long = 22 ' Ubound(callback thunkdata)+1, index of the callback
Private Const IDX_WNDPROC As Long = 9 'Thunk data index of the original WndProc
Private Const IDX_BTABLE As Long = 11 'Thunk data index of the Before table
Private Const IDX_ATABLE As Long = 12 'Thunk data index of the After table
Private Const IDX_PARM_USER As Long = 13 'Thunk data index of the User-defined callback parameter data index
Private Const IDX_UNICODE As Long = 75 'Must be Ubound(subclass thunkdata)+1; index for unicode support
Private Const ALL_MESSAGES As Long = -1 'All messages callback
Private Const MSG_ENTRIES As Long = 32 'Number of msg table entries. Set to 1 if using ALL_MESSAGES for all subclassed windows
Private Const IOCTL_STORAGE_BASE As Long = &H2D
Private Const METHOD_BUFFERED As Long = 0
Private Const FILE_ANY_ACCESS As Long = 0
Private Const GENERIC_READ As Long = &H80000000
Private Const FILE_SHARE_READ As Long = &H1
Private Const OPEN_EXISTING As Long = 3
Private Const FILE_SHARE_WRITE As Long = &H2
Private Const INVALID_HANDLE_VALUE As Long = (-1)
Private Const WM_DEVICECHANGE As Long = &H219
Private Const DBT_DEVICEARRIVAL As Long = &H8000&
Private Const DBT_DEVICEREMOVECOMPLETE As Long = &H8004&
Private Const DBT_DEVTYP_VOLUME As Long = &H2
Private Const DBTF_MEDIA As Long = &H1
Private Enum eThunkType
SubclassThunk = 0
HookThunk = 1
CallbackThunk = 2
End Enum
Private Enum eMsgWhen
MSG_BEFORE = 1
MSG_AFTER = 2
MSG_BEFORE_AFTER = MSG_BEFORE Or MSG_AFTER
End Enum
Enum eDriveType
DRIVE_UNKNOWN
DRIVE_NO_ROOT_DIR
DRIVE_REMOVABLE
DRIVE_FIXED
DRIVE_REMOTE
DRIVE_CDROM
DRIVE_RAMDISK
End Enum
Private Enum STORAGE_PROPERTY_ID
StorageDeviceProperty = 0
StorageAdapterProperty
End Enum
Private Enum STORAGE_QUERY_TYPE
PropertyStandardQuery = 0
PropertyExistsQuery
PropertyMaskQuery
PropertyQueryMaxDefined
End Enum
Enum STORAGE_BUS_TYPE
BusTypeUnknown = 0
BusTypeScsi
BusTypeAtapi
BusTypeAta
BusType1394
BusTypeSsa
BusTypeFibre
BusTypeUsb
BusTypeRAID
BusTypeMaxReserved = &H7F
End Enum
Private Type DEV_BROADCAST_HDR
dbch_size As Long
dbch_devicetype As Long
dbch_reserved As Long
End Type
Private Type DEV_BROADCAST_VOLUME
dbcv_size As Long
dbcv_devicetype As Long
dbcv_reserved As Long
dbcv_unitmask As Long
dbcv_flags As Integer
End Type
Private Type STORAGE_PROPERTY_QUERY
PropertyId As STORAGE_PROPERTY_ID
QueryType As STORAGE_QUERY_TYPE
AdditionalParameters(0) As Byte
End Type
Private Type OVERLAPPED
Internal As Long
InternalHigh As Long
offset As Long
OffsetHigh As Long
hEvent As Long
End Type
Private Type STORAGE_DEVICE_DESCRIPTOR
Version As Long
Size As Long
DeviceType As Byte
DeviceTypeModifier As Byte
RemovableMedia As Byte
CommandQueueing As Byte
VendorIdOffset As Long
ProductIdOffset As Long
ProductRevisionOffset As Long
SerialNumberOffset As Long
BusType As STORAGE_BUS_TYPE
RawPropertiesLength As Long
RawDeviceProperties(0) As Byte
End Type
Private Declare Sub RtlMoveMemory Lib "kernel32" (ByVal Destination As Long, ByVal Source As Long, ByVal Length As Long)
Private Declare Function IsBadCodePtr Lib "kernel32" (ByVal lpfn As Long) As Long
Private Declare Function VirtualAlloc Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long
Private Declare Function VirtualFree Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal dwFreeType As Long) As Long
Private Declare Function GetModuleHandleA Lib "kernel32" (ByVal lpModuleName As String) As Long
Private Declare Function GetModuleHandleW Lib "kernel32" (ByVal lpModuleName As Long) As Long
Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function CallWindowProcA Lib "user32" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function CallWindowProcW Lib "user32" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function GetCurrentProcessId Lib "kernel32" () As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function IsWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function IsWindowUnicode Lib "user32.dll" (ByVal hwnd As Long) As Long
Private Declare Function SendMessageA Lib "user32.dll" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByRef lParam As Any) As Long
Private Declare Function SendMessageW Lib "user32.dll" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByRef lParam As Any) As Long
Private Declare Function SetWindowLongA Lib "user32" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SetWindowLongW Lib "user32" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Any, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Long, ByVal dwIoControlCode As Long, lpInBuffer As Any, ByVal nInBufferSize As Long, lpOutBuffer As Any, ByVal nOutBufferSize As Long, lpBytesReturned As Long, lpOverlapped As OVERLAPPED) As Long
Private Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long
Private Declare Function DestroyWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDst As Any, pSrc As Any, ByVal ByteLen As Long)
Private Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long
Private c_lhWnd As Long
Private z_IDEflag As Long 'Flag indicating we are in IDE
Private z_ScMem As Long 'Thunk base address
Private z_scFunk As Collection 'hWnd/thunk-address collection
Private z_hkFunk As Collection 'hook/thunk-address collection
Private z_cbFunk As Collection 'callback/thunk-address collection
Public Event DriveArrival(ByVal sDrive As String, ByVal lDriveType As eDriveType)
Public Event DriveRemoval(ByVal sDrive As String)
Private Sub Class_Initialize()
c_lhWnd = CreateWindowEx(0, "STATIC", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
If Not c_lhWnd = 0 Then
If ssc_Subclass(c_lhWnd, , 1) Then
Call ssc_AddMsg(c_lhWnd, WM_DEVICECHANGE, MSG_AFTER)
Else
Call DestroyWindow(c_lhWnd): c_lhWnd = 0
End If
End If
End Sub
Private Sub Class_Terminate()
Call ssc_Terminate
Call DestroyWindow(c_lhWnd)
c_lhWnd = 0
End Sub
'-The following routines are exclusively for the ssc_subclass routines----------------------------
Private Function ssc_Subclass(ByVal lng_hWnd As Long, _
Optional ByVal lParamUser As Long = 0, _
Optional ByVal nOrdinal As Long = 1, _
Optional ByVal oCallback As Object = Nothing, _
Optional ByVal bIdeSafety As Boolean = True, _
Optional ByVal bUnicode As Boolean = False) As Boolean 'Subclass the specified window handle
' \\LaVolpe - reworked routine a bit, revised the ASM to allow auto-unsubclass on WM_DESTROY
Dim z_Sc(0 To IDX_UNICODE) As Long 'Thunk machine-code initialised here
Const CODE_LEN As Long = 4 * IDX_UNICODE 'Thunk length in bytes
Const MEM_LEN As Long = CODE_LEN + (8 * (MSG_ENTRIES)) 'Bytes to allocate per thunk, data + code + msg tables
Const PAGE_RWX As Long = &H40& 'Allocate executable memory
Const MEM_COMMIT As Long = &H1000& 'Commit allocated memory
Const MEM_RELEASE As Long = &H8000& 'Release allocated memory flag
Const IDX_EBMODE As Long = 3 'Thunk data index of the EbMode function address
Const IDX_CWP As Long = 4 'Thunk data index of the CallWindowProc function address
Const IDX_SWL As Long = 5 'Thunk data index of the SetWindowsLong function address
Const IDX_FREE As Long = 6 'Thunk data index of the VirtualFree function address
Const IDX_BADPTR As Long = 7 'Thunk data index of the IsBadCodePtr function address
Const IDX_OWNER As Long = 8 'Thunk data index of the Owner object's vTable address
Const IDX_CALLBACK As Long = 10 'Thunk data index of the callback method address
Const IDX_EBX As Long = 16 'Thunk code patch index of the thunk data
Const GWL_WNDPROC As Long = -4 'SetWindowsLong WndProc index
Const WNDPROC_OFF As Long = &H38 'Thunk offset to the WndProc execution address
Const SUB_NAME As String = "ssc_Subclass" 'This routine's name
Dim nAddr As Long
Dim nID As Long
Dim nMyID As Long
If IsWindow(lng_hWnd) = 0 Then 'Ensure the window handle is valid
zError SUB_NAME, "Invalid window handle"
Exit Function
End If
nMyID = GetCurrentProcessId 'Get this process's ID
GetWindowThreadProcessId lng_hWnd, nID 'Get the process ID associated with the window handle
If nID <> nMyID Then 'Ensure that the window handle doesn't belong to another process
zError SUB_NAME, "Window handle belongs to another process"
Exit Function
End If
If oCallback Is Nothing Then Set oCallback = Me 'If the user hasn't specified the callback owner
nAddr = zAddressOf(oCallback, nOrdinal) 'Get the address of the specified ordinal method
If nAddr = 0 Then 'Ensure that we've found the ordinal method
zError SUB_NAME, "Callback method not found"
Exit Function
End If
z_ScMem = VirtualAlloc(0, MEM_LEN, MEM_COMMIT, PAGE_RWX) 'Allocate executable memory
If z_ScMem <> 0 Then 'Ensure the allocation succeeded
If z_scFunk Is Nothing Then Set z_scFunk = New Collection 'If this is the first time through, do the one-time initialization
On Error GoTo CatchDoubleSub 'Catch double subclassing
z_scFunk.Add z_ScMem, "h" & lng_hWnd 'Add the hWnd/thunk-address to the collection
On Error GoTo 0
' \\Tai Chi Minh Ralph Eastwood - fixed bug where the MSG_AFTER was not being honored
' \\LaVolpe - modified thunks to allow auto-unsubclassing when WM_DESTROY received
z_Sc(14) = &HD231C031: z_Sc(15) = &HBBE58960: z_Sc(16) = &H12345678: z_Sc(17) = &HF63103FF: z_Sc(18) = &H750C4339: z_Sc(19) = &H7B8B4A38: z_Sc(20) = &H95E82C: z_Sc(21) = &H7D810000: z_Sc(22) = &H228&: z_Sc(23) = &HC70C7500: z_Sc(24) = &H20443: z_Sc(25) = &H5E90000: z_Sc(26) = &H39000000: z_Sc(27) = &HF751475: z_Sc(28) = &H25E8&: z_Sc(29) = &H8BD23100: z_Sc(30) = &H6CE8307B: z_Sc(31) = &HFF000000: z_Sc(32) = &H10C2610B: z_Sc(33) = &HC53FF00: z_Sc(34) = &H13D&: z_Sc(35) = &H85BE7400: z_Sc(36) = &HE82A74C0: z_Sc(37) = &H2&: z_Sc(38) = &H75FFE5EB: z_Sc(39) = &H2C75FF30: z_Sc(40) = &HFF2875FF: z_Sc(41) = &H73FF2475: z_Sc(42) = &H1053FF24: z_Sc(43) = &H811C4589: z_Sc(44) = &H13B&: z_Sc(45) = &H39727500:
z_Sc(46) = &H6D740473: z_Sc(47) = &H2473FF58: z_Sc(48) = &HFFFFFC68: z_Sc(49) = &H873FFFF: z_Sc(50) = &H891453FF: z_Sc(51) = &H7589285D: z_Sc(52) = &H3045C72C: z_Sc(53) = &H8000&: z_Sc(54) = &H8920458B: z_Sc(55) = &H4589145D: z_Sc(56) = &HC4816124: z_Sc(57) = &H4&: z_Sc(58) = &H8B1862FF: z_Sc(59) = &H853AE30F: z_Sc(60) = &H810D78C9: z_Sc(61) = &H4C7&: z_Sc(62) = &H28458B00: z_Sc(63) = &H2975AFF2: z_Sc(64) = &H2873FF52: z_Sc(65) = &H5A1C53FF: z_Sc(66) = &H438D1F75: z_Sc(67) = &H144D8D34: z_Sc(68) = &H1C458D50: z_Sc(69) = &HFF3075FF: z_Sc(70) = &H75FF2C75: z_Sc(71) = &H873FF28: z_Sc(72) = &HFF525150: z_Sc(73) = &H53FF2073: z_Sc(74) = &HC328C328
z_Sc(IDX_EBX) = z_ScMem 'Patch the thunk data address
z_Sc(IDX_INDEX) = lng_hWnd 'Store the window handle in the thunk data
z_Sc(IDX_BTABLE) = z_ScMem + CODE_LEN 'Store the address of the before table in the thunk data
z_Sc(IDX_ATABLE) = z_ScMem + CODE_LEN + ((MSG_ENTRIES + 1) * 4) 'Store the address of the after table in the thunk data
z_Sc(IDX_OWNER) = ObjPtr(oCallback) 'Store the callback owner's object address in the thunk data
z_Sc(IDX_CALLBACK) = nAddr 'Store the callback address in the thunk data
z_Sc(IDX_PARM_USER) = lParamUser 'Store the lParamUser callback parameter in the thunk data
' \\LaVolpe - validate unicode request & cache unicode usage
If bUnicode Then bUnicode = (IsWindowUnicode(lng_hWnd) <> 0&)
z_Sc(IDX_UNICODE) = bUnicode 'Store whether the window is using unicode calls or not
' \\LaVolpe - added extra parameter "bUnicode" to the zFnAddr calls
z_Sc(IDX_FREE) = zFnAddr("kernel32", "VirtualFree", bUnicode) 'Store the VirtualFree function address in the thunk data
z_Sc(IDX_BADPTR) = zFnAddr("kernel32", "IsBadCodePtr", bUnicode) 'Store the IsBadCodePtr function address in the thunk data
Debug.Assert zInIDE
If bIdeSafety = True And z_IDEflag = 1 Then 'If the user wants IDE protection
z_Sc(IDX_EBMODE) = zFnAddr("vba6", "EbMode", bUnicode) 'Store the EbMode function address in the thunk data
End If
' \\LaVolpe - use ANSI for non-unicode usage, else use WideChar calls
If bUnicode Then
z_Sc(IDX_CWP) = zFnAddr("user32", "CallWindowProcW", bUnicode) 'Store CallWindowProc function address in the thunk data
z_Sc(IDX_SWL) = zFnAddr("user32", "SetWindowLongW", bUnicode) 'Store the SetWindowLong function address in the thunk data
z_Sc(IDX_UNICODE) = 1
RtlMoveMemory z_ScMem, VarPtr(z_Sc(0)), CODE_LEN 'Copy the thunk code/data to the allocated memory
nAddr = SetWindowLongW(lng_hWnd, GWL_WNDPROC, z_ScMem + WNDPROC_OFF) 'Set the new WndProc, return the address of the original WndProc
Else
z_Sc(IDX_CWP) = zFnAddr("user32", "CallWindowProcA", bUnicode) 'Store CallWindowProc function address in the thunk data
z_Sc(IDX_SWL) = zFnAddr("user32", "SetWindowLongA", bUnicode) 'Store the SetWindowLong function address in the thunk data
RtlMoveMemory z_ScMem, VarPtr(z_Sc(0)), CODE_LEN 'Copy the thunk code/data to the allocated memory
nAddr = SetWindowLongA(lng_hWnd, GWL_WNDPROC, z_ScMem + WNDPROC_OFF) 'Set the new WndProc, return the address of the original WndProc
End If
If nAddr = 0 Then 'Ensure the new WndProc was set correctly
zError SUB_NAME, "SetWindowLong failed, error #" & Err.LastDllError
GoTo ReleaseMemory
End If
'Store the original WndProc address in the thunk data
RtlMoveMemory z_ScMem + IDX_WNDPROC * 4, VarPtr(nAddr), 4& ' z_Sc(IDX_WNDPROC) = nAddr
ssc_Subclass = True 'Indicate success
Else
zError SUB_NAME, "VirtualAlloc failed, error: " & Err.LastDllError
End If
Exit Function 'Exit ssc_Subclass
CatchDoubleSub:
zError SUB_NAME, "Window handle is already subclassed"
ReleaseMemory:
VirtualFree z_ScMem, 0, MEM_RELEASE 'ssc_Subclass has failed after memory allocation, so release the memory
End Function
'Terminate all subclassing
Private Sub ssc_Terminate()
' can be made public. Releases all subclassing
' can be removed and zTerminateThunks can be called directly
zTerminateThunks SubclassThunk
End Sub
'Add the message value to the window handle's specified callback table
Private Sub ssc_AddMsg(ByVal lng_hWnd As Long, ByVal uMsg As Long, Optional ByVal When As eMsgWhen = MSG_AFTER)
' Note: can be removed if not needed and zAddMsg can be called directly
If IsBadCodePtr(zMap_VFunction(lng_hWnd, SubclassThunk)) = 0 Then 'Ensure that the thunk hasn't already released its memory
If When And MSG_BEFORE Then 'If the message is to be added to the before original WndProc table...
zAddMsg uMsg, IDX_BTABLE 'Add the message to the before table
End If
If When And MSG_AFTER Then 'If message is to be added to the after original WndProc table...
zAddMsg uMsg, IDX_ATABLE 'Add the message to the after table
End If
End If
End Sub
'Delete the message value from the window handle's specified callback table
Private Sub ssc_DelMsg(ByVal lng_hWnd As Long, ByVal uMsg As Long, Optional ByVal When As eMsgWhen = MSG_AFTER)
' Note: can be removed if not needed and zDelMsg can be called directly
If IsBadCodePtr(zMap_VFunction(lng_hWnd, SubclassThunk)) = 0 Then 'Ensure that the thunk hasn't already released its memory
If When And MSG_BEFORE Then 'If the message is to be deleted from the before original WndProc table...
zDelMsg uMsg, IDX_BTABLE 'Delete the message from the before table
End If
If When And MSG_AFTER Then 'If the message is to be deleted from the after original WndProc table...
zDelMsg uMsg, IDX_ATABLE 'Delete the message from the after table
End If
End If
End Sub
'Call the original WndProc
Private Function ssc_CallOrigWndProc(ByVal lng_hWnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
' Note: can be removed if you do not use this function inside of your window procedure
If IsBadCodePtr(zMap_VFunction(lng_hWnd, SubclassThunk)) = 0 Then 'Ensure that the thunk hasn't already released its memory
If zData(IDX_UNICODE) Then
ssc_CallOrigWndProc = CallWindowProcW(zData(IDX_WNDPROC), lng_hWnd, uMsg, wParam, lParam) 'Call the original WndProc of the passed window handle parameter
Else
ssc_CallOrigWndProc = CallWindowProcA(zData(IDX_WNDPROC), lng_hWnd, uMsg, wParam, lParam) 'Call the original WndProc of the passed window handle parameter
End If
End If
End Function
'Get the subclasser lParamUser callback parameter
Private Function zGet_lParamUser(ByVal hWnd_Hook_ID As Long, vType As eThunkType) As Long
'Note: can be removed if you never need to retrieve/update your user-defined paramter. See ssc_Subclass
If vType <> CallbackThunk Then
If IsBadCodePtr(zMap_VFunction(hWnd_Hook_ID, vType)) = 0 Then 'Ensure that the thunk hasn't already released its memory
zGet_lParamUser = zData(IDX_PARM_USER) 'Get the lParamUser callback parameter
End If
End If
End Function
'Let the subclasser lParamUser callback parameter
Private Sub zSet_lParamUser(ByVal hWnd_Hook_ID As Long, vType As eThunkType, newValue As Long)
'Note: can be removed if you never need to retrieve/update your user-defined paramter. See ssc_Subclass
If vType <> CallbackThunk Then
If IsBadCodePtr(zMap_VFunction(hWnd_Hook_ID, vType)) = 0 Then 'Ensure that the thunk hasn't already released its memory
zData(IDX_PARM_USER) = newValue 'Set the lParamUser callback parameter
End If
End If
End Sub
'Add the message to the specified table of the window handle
Private Sub zAddMsg(ByVal uMsg As Long, ByVal nTable As Long)
Dim nCount As Long 'Table entry count
Dim nBase As Long 'Remember z_ScMem
Dim i As Long 'Loop index
nBase = z_ScMem 'Remember z_ScMem so that we can restore its value on exit
z_ScMem = zData(nTable) 'Map zData() to the specified table
If uMsg = ALL_MESSAGES Then 'If ALL_MESSAGES are being added to the table...
nCount = ALL_MESSAGES 'Set the table entry count to ALL_MESSAGES
Else
nCount = zData(0) 'Get the current table entry count
If nCount >= MSG_ENTRIES Then 'Check for message table overflow
zError "zAddMsg", "Message table overflow. Either increase the value of Const MSG_ENTRIES or use ALL_MESSAGES instead of specific message values"
GoTo Bail
End If
For i = 1 To nCount 'Loop through the table entries
If zData(i) = 0 Then 'If the element is free...
zData(i) = uMsg 'Use this element
GoTo Bail 'Bail
ElseIf zData(i) = uMsg Then 'If the message is already in the table...
GoTo Bail 'Bail
End If
Next i 'Next message table entry
nCount = i 'On drop through: i = nCount + 1, the new table entry count
zData(nCount) = uMsg 'Store the message in the appended table entry
End If
zData(0) = nCount 'Store the new table entry count
Bail:
z_ScMem = nBase 'Restore the value of z_ScMem
End Sub
'Delete the message from the specified table of the window handle
Private Sub zDelMsg(ByVal uMsg As Long, ByVal nTable As Long)
Dim nCount As Long 'Table entry count
Dim nBase As Long 'Remember z_ScMem
Dim i As Long 'Loop index
nBase = z_ScMem 'Remember z_ScMem so that we can restore its value on exit
z_ScMem = zData(nTable) 'Map zData() to the specified table
If uMsg = ALL_MESSAGES Then 'If ALL_MESSAGES are being deleted from the table...
zData(0) = 0 'Zero the table entry count
Else
nCount = zData(0) 'Get the table entry count
For i = 1 To nCount 'Loop through the table entries
If zData(i) = uMsg Then 'If the message is found...
zData(i) = 0 'Null the msg value -- also frees the element for re-use
GoTo Bail 'Bail
End If
Next i 'Next message table entry
zError "zDelMsg", "Message &H" & Hex$(uMsg) & " not found in table"
End If
Bail:
z_ScMem = nBase 'Restore the value of z_ScMem
End Sub