📄 extooltip.cls
字号:
'Delete a message from the table of those that will invoke a callback.
Private Sub DelMsg(ByVal lng_hWnd As Long, ByVal uMsg As Long, Optional ByVal When As eMsgWhen = MSG_AFTER)
'Parameters:
'lng_hWnd - The handle of the window for which the uMsg is to be removed from the callback table
'uMsg - The message number that will be removed from the callback table. NB Can also be ALL_MESSAGES, ie all messages will callback
'When - Whether the msg is to be removed from the before, after or both callback tables
With sc_aSubData(zIdx(lng_hWnd))
If When And eMsgWhen.MSG_BEFORE Then
Call zDelMsg(uMsg, .aMsgTblB, .nMsgCntB, eMsgWhen.MSG_BEFORE, .nAddrSub)
End If
If When And eMsgWhen.MSG_AFTER Then
Call zDelMsg(uMsg, .aMsgTblA, .nMsgCntA, eMsgWhen.MSG_AFTER, .nAddrSub)
End If
End With
End Sub
'Return whether we're running in the IDE.
Private Function InIDE() As Boolean
Debug.Assert zSetTrue(InIDE)
End Function
'Start subclassing the passed window handle
Private Function Start(ByVal lng_hWnd As Long) As Long
'Parameters:
'lng_hWnd - The handle of the window to be subclassed
'Returns;
'The sc_aSubData() index
Dim I As Long 'Loop index
Dim j As Long 'Loop index
Dim nSubIdx As Long 'Subclass data index
Dim sSubCode As String 'Subclass code string
Const GMEM_FIXED As Long = 0 'Fixed memory GlobalAlloc flag
Const PAGE_EXECUTE_READWRITE As Long = &H40& 'Allow memory to execute without violating XP SP2 Data Execution Prevention
Const PATCH_01 As Long = 18 'Code buffer offset to the location of the relative address to EbMode
Const PATCH_02 As Long = 68 'Address of the previous WndProc
Const PATCH_03 As Long = 78 'Relative address of SetWindowsLong
Const PATCH_06 As Long = 116 'Address of the previous WndProc
Const PATCH_07 As Long = 121 'Relative address of CallWindowProc
Const PATCH_0A As Long = 186 'Address of the owner object
Const FUNC_CWP As String = "CallWindowProcA" 'We use CallWindowProc to call the original WndProc
Const FUNC_EBM As String = "EbMode" 'VBA's EbMode function allows the machine code thunk to know if the IDE has stopped or is on a breakpoint
Const FUNC_SWL As String = "SetWindowLongA" 'SetWindowLongA allows the cSubclasser machine code thunk to unsubclass the subclasser itself if it detects via the EbMode function that the IDE has stopped
Const MOD_USER As String = "user32" 'Location of the SetWindowLongA & CallWindowProc functions
Const MOD_VBA5 As String = "vba5" 'Location of the EbMode function if running VB5
Const MOD_VBA6 As String = "vba6" 'Location of the EbMode function if running VB6
'If it's the first time through here..
If sc_aBuf(1) = 0 Then
'Build the hex pair subclass string
sSubCode = "5589E583C4F85731C08945FC8945F8EB0EE80000000083F802742185C07424E830000000837DF800750AE838000000E84D0000005F8B45FCC9C21000E826000000EBF168000000006AFCFF7508E800000000EBE031D24ABF00000000B900000000E82D000000C3FF7514FF7510FF750CFF75086800000000E8000000008945FCC331D2BF00000000B900000000E801000000C3E32F09C978078B450CF2AF75248D4514508D4510508D450C508D4508508D45FC508D45F85052B800000000508B00FF501CC3"
'Convert the string from hex pairs to bytes and store in the machine code buffer
I = 1
Do While j < CODE_LEN
j = j + 1
sc_aBuf(j) = CByte("&H" & Mid$(sSubCode, I, 2)) 'Convert a pair of hex characters to an eight-bit value and store in the static code buffer array
I = I + 2
Loop 'Next pair of hex characters
'Get API function addresses
If InIDE Then 'If we're running in the VB IDE
sc_aBuf(16) = &H90 'Patch the code buffer to enable the IDE state code
sc_aBuf(17) = &H90 'Patch the code buffer to enable the IDE state code
sc_pEbMode = zAddrFunc(MOD_VBA6, FUNC_EBM) 'Get the address of EbMode in vba6.dll
If sc_pEbMode = 0 Then 'Found?
sc_pEbMode = zAddrFunc(MOD_VBA5, FUNC_EBM) 'VB5 perhaps
End If
End If
Call zPatchVal(VarPtr(sc_aBuf(1)), PATCH_0A, ObjPtr(Me)) 'Patch the address of this object instance into the static machine code buffer
sc_pCWP = zAddrFunc(MOD_USER, FUNC_CWP) 'Get the address of the CallWindowsProc function
sc_pSWL = zAddrFunc(MOD_USER, FUNC_SWL) 'Get the address of the SetWindowLongA function
ReDim sc_aSubData(0 To 0) As tSubData 'Create the first sc_aSubData element
Else
nSubIdx = zIdx(lng_hWnd, True)
If nSubIdx = -1 Then 'If an sc_aSubData element isn't being re-cycled
nSubIdx = UBound(sc_aSubData()) + 1 'Calculate the next element
ReDim Preserve sc_aSubData(0 To nSubIdx) As tSubData 'Create a new sc_aSubData element
End If
Start = nSubIdx
End If
With sc_aSubData(nSubIdx)
.nAddrSub = GlobalAlloc(GMEM_FIXED, CODE_LEN) 'Allocate memory for the machine code WndProc
Call VirtualProtect(ByVal .nAddrSub, CODE_LEN, PAGE_EXECUTE_READWRITE, I) 'Mark memory as executable
Call RtlMoveMemory(ByVal .nAddrSub, sc_aBuf(1), CODE_LEN) 'Copy the machine code from the static byte array to the code array in sc_aSubData
.hwnd = lng_hWnd 'Store the hWnd
.nAddrOrig = SetWindowLongA(.hwnd, GWL_WNDPROC, .nAddrSub) 'Set our WndProc in place
Call zPatchRel(.nAddrSub, PATCH_01, sc_pEbMode) 'Patch the relative address to the VBA EbMode api function, whether we need to not.. hardly worth testing
Call zPatchVal(.nAddrSub, PATCH_02, .nAddrOrig) 'Original WndProc address for CallWindowProc, call the original WndProc
Call zPatchRel(.nAddrSub, PATCH_03, sc_pSWL) 'Patch the relative address of the SetWindowLongA api function
Call zPatchVal(.nAddrSub, PATCH_06, .nAddrOrig) 'Original WndProc address for SetWindowLongA, unsubclass on IDE stop
Call zPatchRel(.nAddrSub, PATCH_07, sc_pCWP) 'Patch the relative address of the CallWindowProc api function
End With
End Function
'Stop all subclassing
Private Sub StopAll()
On Error Resume Next
Dim I As Long
I = UBound(sc_aSubData()) 'Get the upper bound of the subclass data array
Do While I >= 0 'Iterate through each element
With sc_aSubData(I)
If .hwnd <> 0 Then 'If not previously Subclass_Stop'd
Call StopWnd(.hwnd) 'Subclass_Stop
End If
End With
I = I - 1 'Next element
Loop
End Sub
'Stop subclassing the passed window handle
Private Sub StopWnd(ByVal lng_hWnd As Long)
'Parameters:
'lng_hWnd - The handle of the window to stop being subclassed
With sc_aSubData(zIdx(lng_hWnd))
Call SetWindowLongA(.hwnd, GWL_WNDPROC, .nAddrOrig) 'Restore the original WndProc
Call zPatchVal(.nAddrSub, PATCH_05, 0) 'Patch the Table B entry count to ensure no further 'before' callbacks
Call zPatchVal(.nAddrSub, PATCH_09, 0) 'Patch the Table A entry count to ensure no further 'after' callbacks
Call GlobalFree(.nAddrSub) 'Release the machine code memory
.hwnd = 0 'Mark the sc_aSubData element as available for re-use
.nMsgCntB = 0 'Clear the before table
.nMsgCntA = 0 'Clear the after table
Erase .aMsgTblB 'Erase the before table
Erase .aMsgTblA 'Erase the after table
End With
End Sub
'======================================================================================================
'These z??? routines are exclusively called by the Subclass_??? routines.
'Worker sub for Subclass_AddMsg
Private Sub zAddMsg(ByVal uMsg As Long, ByRef aMsgTbl() As Long, ByRef nMsgCnt As Long, ByVal When As eMsgWhen, ByVal nAddr As Long)
Dim nEntry As Long 'Message table entry index
Dim nOff1 As Long 'Machine code buffer offset 1
Dim nOff2 As Long 'Machine code buffer offset 2
If uMsg = ALL_MESSAGES Then 'If all messages
nMsgCnt = ALL_MESSAGES 'Indicates that all messages will callback
Else 'Else a specific message number
Do While nEntry < nMsgCnt 'For each existing entry. NB will skip if nMsgCnt = 0
nEntry = nEntry + 1
If aMsgTbl(nEntry) = 0 Then 'This msg table slot is a deleted entry
aMsgTbl(nEntry) = uMsg 'Re-use this entry
Exit Sub 'Bail
ElseIf aMsgTbl(nEntry) = uMsg Then 'The msg is already in the table!
Exit Sub 'Bail
End If
Loop 'Next entry
nMsgCnt = nMsgCnt + 1 'New slot required, bump the table entry count
ReDim Preserve aMsgTbl(1 To nMsgCnt) As Long 'Bump the size of the table.
aMsgTbl(nMsgCnt) = uMsg 'Store the message number in the table
End If
If When = eMsgWhen.MSG_BEFORE Then 'If before
nOff1 = PATCH_04 'Offset to the Before table
nOff2 = PATCH_05 'Offset to the Before table entry count
Else 'Else after
nOff1 = PATCH_08 'Offset to the After table
nOff2 = PATCH_09 'Offset to the After table entry count
End If
If uMsg <> ALL_MESSAGES Then
Call zPatchVal(nAddr, nOff1, VarPtr(aMsgTbl(1))) 'Address of the msg table, has to be re-patched because Redim Preserve will move it in memory.
End If
Call zPatchVal(nAddr, nOff2, nMsgCnt) 'Patch the appropriate table entry count
End Sub
'Return the memory address of the passed function in the passed dll
Private Function zAddrFunc(ByVal sDLL As String, ByVal sProc As String) As Long
zAddrFunc = GetProcAddress(GetModuleHandleA(sDLL), sProc)
Debug.Assert zAddrFunc 'You may wish to comment out this line if you're using vb5 else the EbMode GetProcAddress will stop here everytime because we look for vba6.dll first
End Function
'Worker sub for Subclass_DelMsg
Private Sub zDelMsg(ByVal uMsg As Long, ByRef aMsgTbl() As Long, ByRef nMsgCnt As Long, ByVal When As eMsgWhen, ByVal nAddr As Long)
Dim nEntry As Long
If uMsg = ALL_MESSAGES Then 'If deleting all messages
nMsgCnt = 0 'Message count is now zero
If When = eMsgWhen.MSG_BEFORE Then 'If before
nEntry = PATCH_05 'Patch the before table message count location
Else 'Else after
nEntry = PATCH_09 'Patch the after table message count location
End If
Call zPatchVal(nAddr, nEntry, 0) 'Patch the table message count to zero
Else 'Else deleteting a specific message
Do While nEntry < nMsgCnt 'For each table entry
nEntry = nEntry + 1
If aMsgTbl(nEntry) = uMsg Then 'If this entry is the message we wish to delete
aMsgTbl(nEntry) = 0 'Mark the table slot as available
Exit Do 'Bail
End If
Loop 'Next entry
End If
End Sub
'Get the sc_aSubData() array index of the passed hWnd
Private Function zIdx(ByVal lng_hWnd As Long, Optional ByVal bAdd As Boolean = False) As Long
'Get the upper bound of sc_aSubData() - If you get an error here, you're probably Subclass_AddMsg-ing before Subclass_Start
zIdx = UBound(sc_aSubData)
Do While zIdx >= 0 'Iterate through the existing sc_aSubData() elements
With sc_aSubData(zIdx)
If .hwnd = lng_hWnd Then 'If the hWnd of this element is the one we're looking for
If Not bAdd Then 'If we're searching not adding
Exit Function 'Found
End If
ElseIf .hwnd = 0 Then 'If this an element marked for reuse.
If bAdd Then 'If we're adding
Exit Function 'Re-use it
End If
End If
End With
zIdx = zIdx - 1 'Decrement the index
Loop
If Not bAdd Then
Debug.Assert False 'hWnd not found, programmer error
End If
'If we exit here, we're returning -1, no freed elements were found
End Function
'Patch the machine code buffer at the indicated offset with the relative address to the target address.
Private Sub zPatchRel(ByVal nAddr As Long, ByVal nOffset As Long, ByVal nTargetAddr As Long)
Call RtlMoveMemory(ByVal nAddr + nOffset, nTargetAddr - nAddr - nOffset - 4, 4)
End Sub
'Patch the machine code buffer at the indicated offset with the passed value
Private Sub zPatchVal(ByVal nAddr As Long, ByVal nOffset As Long, ByVal nValue As Long)
Call RtlMoveMemory(ByVal nAddr + nOffset, nValue, 4)
End Sub
'Worker function for Subclass_InIDE
Private Function zSetTrue(ByRef bValue As Boolean) As Boolean
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -