I have an Access 365 64-bit problem I am trying to solve and I need some guidance.
I have a byte array with image data, retrieved from a Base64 encoded string. The decoding is working just fine and I can produce the array as expected. I have had this code from an older 32 bit version of VBA applications and it remains fully functional. So far so good.
The issue comes into play when I am trying to place the image data into a forms image control directly - no saving to a file. I have had this working in the 32 bit applications but now that the office 365 subscription I am working with is 64 bit (as is the rest of the company) I am having trouble converting the API calls and subsequent code across to 64-bit compatible versions. The images are largely PNG and JPG images (when extracted).
The main issue seems to be coming from the need to replace OLEPRO32 with OLEAUT32. The code runs (seemingly) without error however I am not getting any output. I am sure that I am missing something simple but I just cannot see it. My code is below as well as the API declarations I am using, along with the old OLEPRO32 declaration which is commented out.
Option Explicit
Option Compare Database
Declare PtrSafe Function CreateStreamOnHGlobal Lib "ole32" (ByVal hGlobal As LongPtr, ByVal fDeleteOnRelease As Long, ppstm As Any) As LongPtr
Declare PtrSafe Function GlobalAlloc Lib "kernel32" (ByVal uFlags As Long, ByVal dwBytes As Long) As LongPtr
Declare PtrSafe Function GlobalLock Lib "kernel32" (ByVal hMem As LongPtr) As LongPtr
Declare PtrSafe Function GlobalUnlock Lib "kernel32" (ByVal hMem As LongPtr) As LongPtr
'Declare PtrSafe Function OleLoadPicture Lib "olepro32" (pStream As Any, ByVal lSize As Long, ByVal fRunmode As Long, riid As Any, ppvObj As Any) As LongPtr
Declare PtrSafe Function OleLoadPicture Lib "oleaut32" (pStream As Any, ByVal lSize As Long, ByVal fRunmode As Long, riid As Any, ppvObj As Any) As LongPtr
Declare PtrSafe Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)
And here is the routine that uses the declarations:
Public Function ArrayToPicture(inArray() As Byte, Offset As Long, Size As Long) As IPicture
' function creates a stdPicture from the passed array
' Offset is first item in array: 0 for 0 bound arrays
' Size is how many bytes comprise the image
Dim o_hMem As LongPtr
Dim o_lpMem As LongPtr
Dim aGUID(0 To 3) As Long
Dim IIStream As IUnknown
aGUID(0) = &H7BF80980 ' GUID for stdPicture
aGUID(1) = &H101ABF32
aGUID(2) = &HAA00BB8B
aGUID(3) = &HAB0C3000
o_hMem = GlobalAlloc(&H2&, Size)
If Not o_hMem = 0& Then
o_lpMem = GlobalLock(o_hMem)
If Not o_lpMem = 0& Then
CopyMemory ByVal o_lpMem, inArray(Offset), Size
Call GlobalUnlock(o_hMem)
If CreateStreamOnHGlobal(o_hMem, 1&, IIStream) = 0& Then
Call OleLoadPicture(ByVal ObjPtr(IIStream), 0&, 0&, aGUID(0), ArrayToPicture)
End If
End If
End If
End Function
If anyone has any ideas please let me know. The output of this function seems to be nothing at all whereas in the past I could expect a valid iPicture object that could be assigned directly to the form image controls .PictureData.
Any guidance greatly appreciated.
Cheers
The Frog
UPDATE:
I have worked through a large portion of the code and can now specifically isolate the locations where the crashes are happening. Code is below
Option Compare Database
' API declarations
Private Declare PtrSafe Function CreateStreamOnHGlobal Lib "Ole32.dll" (ByRef hGlobal As LongPtr, ByVal fDeleteOnRelease As Long, ByRef ppstm As LongPtr) As Long
Private Declare PtrSafe Function CLSIDFromString Lib "Ole32" (ByVal lpsz As LongPtr, pclsid As Any) As Long
Private Declare PtrSafe Function OLELoadPicture Lib "OleAut32.lib" (ByRef lpStream As LongPtr, ByVal lSize As Long, ByVal fRunMode As Long, ByRef RIID As GUID, ByRef lplpObj As LongPtr) As Long
Private Declare PtrSafe Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As LongPtr, ByVal nCount As Long, lpObject As Any) As Long
Private Declare PtrSafe Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As LongPtr, ByVal nWidth As Long, ByVal nHeight As Long) As LongPtr
Private Declare PtrSafe Function SelectObject Lib "gdi32" (ByVal hdc As LongPtr, ByVal hObject As LongPtr) As LongPtr
Private Declare PtrSafe Function GetDIBits Lib "gdi32" (ByVal aHDC As LongPtr, ByVal hBitmap As LongPtr, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFO, ByVal wUsage As Long) As Long
Private Declare PtrSafe Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As LongPtr) As LongPtr
Private Declare PtrSafe Function DeleteDC Lib "gdi32" (ByVal hdc As LongPtr) As Long
Private Declare PtrSafe Function GetWindowDC Lib "user32" (ByVal hWnd As LongPtr) As LongPtr
Private Declare PtrSafe Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As LongPtr) As LongPtr
Private Declare PtrSafe Function GlobalLock Lib "kernel32" (ByVal hMem As LongPtr) As LongPtr
Private Declare PtrSafe Function GlobalUnlock Lib "kernel32" (ByVal hMem As LongPtr) As Long
Private Declare PtrSafe Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
'Necessary Types
Private Type BITMAPINFOHEADER '40 Bytes
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Private Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbReserved As Byte
End Type
Private Type BITMAPINFO
bmiHeader As BITMAPINFOHEADER
bmiColors As RGBQUAD
End Type
Private Type DIBHEADER '14 magical bytes
BmpIdentification(1) As Byte
BmpSize(3) As Byte
BmpCreator As Integer
BmpCreator2 As Integer
BmpDataOffset(3) As Byte
End Type
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type
Public Function StdPictureToDibImage(ByRef Picture As StdPicture, Optional PadColor As Integer = -1) As Byte()
' Performs StdPicture to DIB compliant Byte Array
' Adopted based on : http://www.vbforums.com/showthread.php?833125-How-to-convert-StdPicture-into-pixel-array
' The Byte Arrays to Hold the Initial PictureData along with the Final One
Dim ImageData() As Byte
Dim buffer() As Byte
Dim tmp() As Byte
' Type Instances
Dim BMI As BITMAPINFO
Dim DIB As DIBHEADER
Dim PaddingColor As Integer
' API handle
Dim hdc As LongPtr
Dim hpic As LongPtr
hdc = CreateCompatibleDC(0) 'Create a temporary in-memory device context
BMI.bmiHeader.biSize = Len(BMI.bmiHeader) 'Initialize BitmapInfoHeader with header size
'Get the header Info of the Image based on the StdPicture handle provided
GetDIBits hdc, Picture.handle, 0, 0, ByVal 0&, BMI, 0 'Get Information about the image
'Normally here we would setup the header for BMI header but i found out that simply is not working as it should
' Only the DIB header needs manual handling
With DIB
.BmpIdentification(0) = 66
.BmpIdentification(1) = 77
tmp = LongToByteArray(BMI.bmiHeader.biSizeImage + Len(DIB) + Len(BMI.bmiHeader))
.BmpSize(0) = tmp(0)
.BmpSize(1) = tmp(1)
.BmpSize(2) = tmp(2)
.BmpSize(3) = tmp(3)
.BmpCreator = 0
.BmpCreator2 = 0
tmp = LongToByteArray(Len(DIB) + Len(BMI.bmiHeader))
.BmpDataOffset(0) = tmp(0)
.BmpDataOffset(1) = tmp(1)
.BmpDataOffset(2) = tmp(2)
.BmpDataOffset(3) = tmp(3)
End With
'Byte Arrays Initialization
ReDim ImageData(3, BMI.bmiHeader.biWidth - 1, BMI.bmiHeader.biHeight - 1) 'Initialize array for holding pixel data
ReDim buffer(0 To BMI.bmiHeader.biSizeImage + (Len(DIB) + Len(BMI.bmiHeader)) - 1)
'Here we get the actual Image Data from the StdPicture
'This was the most troubled part of the whole process as it kept truncating the image to around 3/4
' no matter what....until i noticed that the info "feeded" to the BMI header was wrong
hpic = CLngPtr(Picture.handle)
GetDIBits hdc, hpic, 0, Abs(BMI.bmiHeader.biHeight), ImageData(0, 0, 0), BMI, 0 'Get pixel data
'GetDIBits hdc, Picture.handle, 0, Abs(BMI.bmiHeader.biHeight), ImageData(0, 0, 0), BMI, 0 'Get pixel data
'Constructing the Final Image Data
'1st the DIB header ***** CRUCIAL ******* , without this everything fails and burns
CopyMemory buffer(0), DIB, Len(DIB)
'2nd the BMP header, this was done in all other cases
CopyMemory buffer(Len(DIB)), BMI.bmiHeader, Len(BMI.bmiHeader)
'3rd the actual image data
CopyMemory buffer(Len(DIB) + Len(BMI.bmiHeader)), ImageData(0, 0, 0), 3 * (BMI.bmiHeader.biWidth - 1) * (BMI.bmiHeader.biHeight - 1)
'Cleaning up
DeleteDC hdc 'Get rid of temporary in-memory device context
'Some Padding to remove the "dead" space because Images Dimensions are "resized" to multiple of 4s
'so if the either of the dimensions is not exactly a multiple of 4 then padding is applied which
'results is "dead" pixels
If PadColor < 0 Then
PaddingColor = 255
Else
PaddingColor = PadColor
End If
For I = UBound(buffer) To LBound(buffer) Step -1
If buffer(I) = 0 Then
buffer(I) = PaddingColor
Else
Exit For
End If
Next
'The final magical byte array...no more temp files,links,extra controls...whatever..everything in memory
StdPictureToDibImage = buffer()
End Function
Public Function PictureFromByteStream(ByRef B() As Byte) As IPicture
Dim LowerBound As Long
Dim ByteCount As Long
Dim hMem As Long
Dim lpMem As Long
Dim IID_IPicture As GUID
Dim istm As stdole.IUnknown
On Error GoTo Err_Init
If UBound(B, 1) < 0 Then
Exit Function
End If
LowerBound = LBound(B)
ByteCount = (UBound(B) - LowerBound) + 1
hMem = GlobalAlloc(&H2, ByteCount)
If hMem <> 0 Then
lpMem = GlobalLock(hMem)
If lpMem <> 0 Then
MoveMemory ByVal lpMem, B(LowerBound), ByteCount
Call GlobalUnlock(hMem)
If CreateStreamOnHGlobal(hMem, 1, istm) = 0 Then
If CLSIDFromString(StrPtr("{7BF80980-BF32-101A-8BBB-00AA00300CAB}"), IID_IPicture) = 0 Then
Call OLELoadPicture(ByVal ObjPtr(istm), ByteCount, 0, IID_IPicture, PictureFromByteStream)
End If
End If
End If
End If
Exit Function
Err_Init:
If err.Number = 9 Then
Debug.Print err.Number & " - " & err.Description
End Function
Function ArrayToStdPicture(imageBytes() As Byte) As StdPicture
Dim W As WIA.Vector
Dim s As StdPicture
Set W = New WIA.Vector
W.BinaryData = imageBytes
Set ArrayToStdPicture = W.Picture
If Not W Is Nothing Then Set W = Nothing
End Function
The process is as follows:
ArrayToStdPicture -> StdPictureToDIBImage
The crash occurs on the line:
GetDIBits hdc, hpic, 0, Abs(BMI.bmiHeader.biHeight), ImageData(0, 0, 0), BMI, 0 'Get pixel data
The crash totally crashes MS Access and kills the application.
Hi I am new to VBA and this seems like a simple problem.
I am trying to get the dimensions of an image in excel and using the GetDeviceCaps function as a result.
I will get a variable not defined compile error regarding the VERTES parameter.
The code I use is the following:
Option Explicit
Private Type POINTAPI
x As Long
y As Long
End Type
Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, _
ByVal x As Long, ByVal y As Long) As Long
Private Declare Function GetCursorPos Lib "user32" _
(lpPoint As POINTAPI) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hwnd As Long) _
As Long
Private Declare Function GetDeviceCaps Lib "gdi32" ( _
ByVal hDC As LongPtr _
, ByVal nIndex As Long _
) As LongPtr
Public Sub Test()
Dim tPOS As POINTAPI
Dim AColor As Long
Dim ADC As Long
Dim width As Integer
ADC = GetWindowDC(0)
width = GetDeviceCaps(ADC, VERTRES)
Call GetCursorPos(tPOS)
AColor = GetPixel(ADC, tPOS.x, tPOS.y)
ActiveWindow.Selection.ShapeRange(1).Fill.ForeColor.RGB = 14588691
Debug.Print "width"
Debug.Print width
End Sub
Questions appears to be so basic there isn't anything specific about this online.
I haven't learned yet how to correctly convert the Windows API functions to be used on Excel VBA. If I can't find it online and it isn't something easy like SwapMouseButton or SetDoubleClickTime I just get stuck on getting it to work.
Can I get some help fixing my call of the GetMouseMovePointsEx function and maybe tips to understand better how to do it for other complex function?
Here's what I have in a module:
Private Declare Function SwapMouseButton Lib "user32" (ByVal fSwap As Boolean) As Boolean
Private Declare Function SetDoubleClickTime Lib "user32" (ByVal uInterval As Integer) As Boolean
Private Type MOUSEMOVEPOINT
x As Integer
y As Integer
time As Long
dwExtraInfo As Long
End Type
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Private Declare Function GetActiveWindow Lib "user32" () As Long
'Private Declare Function WindowProc Lib "user32" (ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Const WM_MOUSEDOWN = &H200
Private Declare Function GetMouseMovePointsEx Lib "user32" (ByVal cbSize As Integer, ByRef lppt As MOUSEMOVEPOINT, ByRef lpptBuf() As MOUSEMOVEPOINT, ByVal nBufPoints As Integer, ByVal resolution As Long) As Integer
Private Sub Test1()
SwapMouseButton False 'True|False
End Sub
Private Sub Test2()
SetDoubleClickTime 0 '0=default(500), 48~=fastest I could get, >5000=5000
End Sub
Private Sub Test3()
Dim hwnd As Long, mmp As MOUSEMOVEPOINT, mmpBuf(64) As MOUSEMOVEPOINT, returnedValue As Integer
Sleep 1000
hwnd = GetActiveWindow()
'WindowProc hwnd, WS_MOUSEMOVE, WS_MOUSEMOVE, WS_MOUSEMOVE
mmp.x = 600
mmp.y = 300
mmp.time = 200
returnedValue = GetMouseMovePointsEx(Len(mmp), mmp, mmpBuf, 1000, 1)
If returnedValue = -1 Then
Debug.Print "Error"
Else
Debug.Print mmpBuf(0).x
Debug.Print mmpBuf(0).y
End If
End Sub
From hours of searching this site and googling I found that hooking into mouse scroll wheel events from VBA for use in userforms/controls is well documented for 32 bit Office and I got this to work quickly and flawlessly on a Win10/64 bit and Word 2016/32 bit environment. However when moving to a 64 bit Office environment (Win10/64bit) it consistently crashed after calling 'SetWindowsHookEx' and then moving the mouse cursor.
Being aware of the Long vs LongLong (LongPtr) implementation changes from 32 to 64 bit and the inconsistent code examples I found with respect to Long/LongPtr, I checked every bit of my code using the standard Microsoft WIN32API declare statements for 64 bit but it still crashes.
For reference: I'm building my own 'Insert cross-references' functionality as an add-in to Word, for private use.
The event log only shows an 'Exception code: 0xc0000005' occurred in VBE7.dll and I am at a loss as how to continue troubleshooting this. I've spent hours online searching for options, trying different things with my code but to no avail. Can anyone advise how to proceed to drill down on this problem? Any help is appreciated.
The relevant code snippet is below, all declares come from the above linked WIN32API reference except WindowFromPoint because the 'LongLong' type for Point seemed wrong to me. All checks on err.LastDllError report no error , except for SetWindowsHookEx, the msg from err.lastDllError is Command successfully completed. On SetWindowsHookEx the message is empty but a non-zero mouse hook is returned. Moving the mouse directly after this call crashes Word - removing the call to SetWindowsHookEx does not crash Word. I've set a debug.print in MouseProc but it never gets there.
Below code is void of VBA7/WIN64 checks as I wanted a clean code for 64 bit to check and get it working before I merge it with my 32 bit implementation.
Option Explicit
' Window field offsets for GetWindowLong() and GetWindowWord()
Private Const GWL_WNDPROC = (-4)
Private Const GWL_HWNDPARENT = (-8)
Private Const GWL_STYLE = (-16)
Private Const GWL_EXSTYLE = (-20)
Private Const GWL_USERDATA = (-21)
Private Const GWL_ID = (-12)
Private Const GWL_HINSTANCE As Long = (-6)
'set up the variables used for the mousewheel
Private Const WH_MOUSE_LL As Long = 14
Private Const WM_MOUSEWHEEL As LongPtr = &H20A
Private Const HC_ACTION As Long = 0
' DLL messages
Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
Private Type POINTAPI
X As Long
Y As Long
End Type
Private Type Msg
hwnd As LongPtr
message As Long
wParam As LongPtr
lParam As LongPtr
time As Long
pt As POINTAPI
End Type
Private Type MOUSEHOOKSTRUCT
pt As POINTAPI
hwnd As LongPtr
wHitTestCode As Long
dwExtraInfo As LongPtr
End Type
Private Declare PtrSafe Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
'Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal point As LongLong) As LongPtr
Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal point As LongPtr) As LongPtr
Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" Alias "GetWindowLongPtrA" (ByVal hwnd As LongPtr, ByVal nIndex As Long) As LongPtr
Private Declare PtrSafe Function SetWindowLongPtr Lib "user32" Alias "SetWindowLongPtrA" (ByVal hwnd As LongPtr, ByVal nIndex As Long, ByVal dwNewLong As LongPtr) As LongPtr
Private Declare PtrSafe Function SetWindowsHook Lib "user32" Alias "SetWindowsHookA" (ByVal nFilterType As Long, ByVal pfnFilterProc As LongPtr) As LongPtr
Private Declare PtrSafe Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As LongPtr, ByVal lpfn As LongPtr, ByVal hmod As LongPtr, ByVal dwThreadId As Long) As LongPtr
Private Declare PtrSafe Function CallNextHookEx Lib "user32" (ByVal hHook As LongPtr, ByVal nCode As Long, ByVal wParam As LongPtr, lParam As Any) As LongPtr
Private Declare PtrSafe Function GetCurrentThreadId Lib "kernel32" () As Long
Private Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As LongPtr) As Long
Private Declare PtrSafe Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, Arguments As LongPtr) As Long
Private Declare PtrSafe Function GetLastError Lib "kernel32" () As Long
Dim n As Long
Private mCtl As MSForms.Control
Private mbHook As Boolean
Private mLngMouseHook As LongPtr
Private mListBoxHwnd As LongPtr
Sub HookListBoxScroll64(frm As Object, ctl As MSForms.Control)
Dim tPT As POINTAPI
Dim lngAppInst As LongPtr
Dim hwndUnderCursor As LongPtr
Dim ptLL As LongLong
GetCursorPos tPT
Debug.Print "GetCursorPos err: " & GetWin32ErrorDescription(err.LastDllError)
ptLL = PointToLongLong(tPT)
Debug.Print "PointToLongLong err: " & GetWin32ErrorDescription(err.LastDllError)
hwndUnderCursor = WindowFromPoint(ptLL)
Debug.Print "WindowFromPoint err: " & GetWin32ErrorDescription(err.LastDllError)
If Not IsNull(frm.ActiveControl) And Not frm.ActiveControl Is ctl Then
ctl.SetFocus
End If
If mListBoxHwnd <> hwndUnderCursor Then
UnhookListBoxScroll64
Debug.Print "UnhookListBoxScroll64 err: " & GetWin32ErrorDescription(err.LastDllError)
Set mCtl = ctl
mListBoxHwnd = hwndUnderCursor
lngAppInst = GetWindowLongPtr(mListBoxHwnd, GWL_HINSTANCE)
Debug.Print "GetWindowLongPtr AppInst: " & lngAppInst & ", err: " & GetWin32ErrorDescription(err.LastDllError)
If Not mbHook Then
mLngMouseHook = SetWindowsHookEx(WH_MOUSE_LL, AddressOf MouseProc, lngAppInst, 0)
Debug.Print "SetWindowsHookEx hook: " & mLngMouseHook & ", err: " & GetWin32ErrorDescription(err.LastDllError)
mbHook = mLngMouseHook <> 0
End If
End If
End Sub
Private Function MouseProc( _
ByVal nCode As Long, ByVal wParam As LongPtr, _
ByRef lParam As MOUSEHOOKSTRUCT) As LongPtr
Debug.Print "MouseProc"
Dim idx As Long
On Error GoTo errH
If (nCode = HC_ACTION) Then
Dim ptLL As LongLong
ptLL = PointToLongLong(lParam.pt)
If WindowFromPoint(ptLL) = mListBoxHwnd Then
If wParam = WM_MOUSEWHEEL Then
MouseProc = True
If TypeOf mCtl Is frame Then
If lParam.hwnd > 0 Then idx = -10 Else idx = 10
idx = idx + mCtl.ScrollTop
If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
mCtl.ScrollTop = idx
End If
ElseIf TypeOf mCtl Is UserForm Then
If lParam.hwnd > 0 Then idx = -10 Else idx = 10
idx = idx + mCtl.ScrollTop
If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
mCtl.ScrollTop = idx
End If
Else
If lParam.hwnd > 0 Then idx = -1 Else idx = 1
idx = idx + mCtl.ListIndex
If idx >= 0 Then mCtl.ListIndex = idx
End If
Exit Function
End If
Else
UnhookListBoxScroll64
End If
End If
MouseProc = CallNextHookEx( _
mLngMouseHook, nCode, wParam, ByVal lParam)
Exit Function
errH:
UnhookListBoxScroll64
End Function
In some computers I get errors when I use byVal modifier. I had in my code some of them but I manage to remove all of them but I need it in the following code:
Public Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, _
ByVal hdc As Long) As Long
Public Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, _
ByVal nIndex As Long) As Long
Const HWND_DESKTOP As Long = 0
Const LOGPIXELSX As Long = 88
Const LOGPIXELSY As Long = 90
'--------------------------------------------------
Public Function TwipsPerPixelX() As Single
'--------------------------------------------------
'Returns the width of a pixel, in twips.
'--------------------------------------------------
Dim lngDC As Long
lngDC = GetDC(HWND_DESKTOP)
TwipsPerPixelX = 1440& / GetDeviceCaps(lngDC, LOGPIXELSX)
ReleaseDC HWND_DESKTOP, lngDC
End Function
'--------------------------------------------------
Public Function TwipsPerPixelY() As Single
'--------------------------------------------------
'Returns the height of a pixel, in twips.
'--------------------------------------------------
Dim lngDC As Long
lngDC = GetDC(HWND_DESKTOP)
TwipsPerPixelY = 1440& / GetDeviceCaps(lngDC, LOGPIXELSY)
ReleaseDC HWND_DESKTOP, lngDC
End Function
I am sure that the error is because of ByVal. I was using ByVal in more functions and they were not working but when I do it in another way (not using ByVal) they work and if I just delete this functions all the others works perfectly. I cannot understand the reason.
Another weird thing is that it happens only in some computers (Win8, office 2013). But I have the same OS, office and security settings. The error that it gives is compilation error:
"compilation error in hidden module: Module4"