Hi, Can anybody help. How to scroll data in DataList by using mouse scroll. DataList have no Scroll method.
daniwaber 0 Light Poster
daniwaber 0 Light Poster
With mousewheel fix your mouse wheel start working in VB6 IDE, (when you do programmig), but when you run the programme wheel doesn't work in DataLit.
AndreRet 526 Senior Poster
Did you have a look at the sample code that came with the scroll add on?
What code are you using to implement the scrolling?
daniwaber 0 Light Poster
Hi I saw the module, but did'nt understand how to use that module for dataList. I don't know how to modify that code for dataList. Please help
AndreRet 526 Senior Poster
Please post the module here so I can have a look at it to post some code you can use.
daniwaber 0 Light Poster
Here is the code from the sample module with add on mousewheel fix.
Attribute VB_Name = "Main"
Option Explicit
Declare Function EnumChildWindows Lib "user32" (ByVal hWndParent _
As Long, ByVal lpEnumFunc As Long, ByVal lParam As Long) As Long
Declare Function EnumThreadWindows Lib "user32" (ByVal dwThreadId _
As Long, ByVal lpfn As Long, ByVal lParam As Long) As Long
Declare Function GetClassName Lib "user32" Alias "GetClassNameA" _
(ByVal hWnd As Long, ByVal lpClassName As String, _
ByVal nMaxCount As Long) As Long
Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" _
(ByVal hWnd As Long, ByVal lpString As String, _
ByVal cch As Long) As Long
Public Declare Function GetCurrentThreadId Lib "kernel32" () As Long
Public Declare Function CallWindowProc Lib "user32" Alias _
"CallWindowProcA" _
(ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal msg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) _
As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As _
Long, ByVal lParam As Long) As Long
Public Declare Function WindowFromPointXY Lib "user32" _
Alias "WindowFromPoint" (ByVal xPoint As Long, _
ByVal yPoint As Long) As Long
Private Declare Function SystemParametersInfo Lib "user32" _
Alias "SystemParametersInfoA" _
(ByVal uAction As Long, _
ByVal uParam As Long, _
lpvParam As Any, _
ByVal fuWinIni As Long) As Long
Public Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function WindowFromPoint Lib "user32" (pt As POINTAPI) As Long
Public Declare Function GetWindowInfo Lib "user32" (ByVal hWnd As Long, ByRef pwi As WINDOWINFO) As Boolean
Public Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Public Declare Function FreeLibrary Lib "kernel32" Alias "FreeLibraryA" (ByVal hLibrary As Long) As Boolean
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Type WINDOWINFO
cbSize As Long
rcWindow As RECT
rcClient As RECT
dwStyle As Long
dwExStyle As Long
cxWindowBorders As Long
cyWindowBorders As Long
atomWindowtype As Long
wCreatorVersion As Long
End Type
Private Type POINTAPI
x As Long
y As Long
End Type
Private Type MOUSEHOOKSTRUCT
pt As POINTAPI
hWnd As Long
wHitTestCode As Long
dwExtraInfo As Long
End Type
Private Type MSLLHOOKSTRUCT
pt As POINTAPI
mouseData As Long
flags As Long
time As Long
dwExtraInfo As Long
End Type
Private Const WM_MOUSEWHEEL = &H20A
Private Const WM_MBUTTONUP = &H208
Private Const WM_MBUTTONDOWN = &H207
Private Const WM_MBUTTONDBLCLK = &H209
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_LBUTTONUP = &H202
Private Const WM_RBUTTONUP = &H205
Private Const MK_LBUTTON = &H1
Private Const MK_MBUTTON = &H10
Private Const MK_RBUTTON = &H2
Public Const WH_MOUSE = 7
Private Const WHEEL_DELTA = 120
Private Const WM_VSCROLL = &H115
Private Const WM_USER As Long = &H400
Private Const WM_SOMETHING = WM_USER + 3139
Public Const GWL_WNDPROC = -4
Public Const WH_MOUSE_LL = 14
Public Const SB_LINEUP = 0
Public Const SB_LINELEFT = 0
Public Const SB_LINEDOWN = 1
Public Const SB_LINERIGHT = 1
Public Const SB_ENDSCROLL = 8
Public Const WS_VISIBLE = &H10000000
Public Const SBS_VERT = 1
Public Const SBS_HORZ = 0
Public Const WM_HSCROLL = &H114
Public Const SPI_GETWHEELSCROLLLINES = 104
Public Enum mButtons
LBUTTON = &H1
MBUTTON = &H10
RBUTTON = &H2
End Enum
Public Const REG_SZ As Long = 1
Public Const REG_DWORD As Long = 4
Public Const HKEY_CLASSES_ROOT = &H80000000
Public Const HKEY_CURRENT_USER = &H80000001
Public Const HKEY_LOCAL_MACHINE = &H80000002
Public Const HKEY_USERS = &H80000003
Public Const ERROR_NONE = 0
Public Const ERROR_BADDB = 1
Public Const ERROR_BADKEY = 2
Public Const ERROR_CANTOPEN = 3
Public Const ERROR_CANTREAD = 4
Public Const ERROR_CANTWRITE = 5
Public Const ERROR_OUTOFMEMORY = 6
Public Const ERROR_ARENA_TRASHED = 7
Public Const ERROR_ACCESS_DENIED = 8
Public Const ERROR_INVALID_PARAMETERS = 87
Public Const ERROR_NO_MORE_ITEMS = 259
Public Const KEY_QUERY_VALUE = &H1
Public Const KEY_SET_VALUE = &H2
Public Const KEY_ALL_ACCESS = &H3F
Public Const REG_OPTION_NON_VOLATILE = 0
Declare Function RegCloseKey Lib "advapi32.dll" _
(ByVal hKey As Long) As Long
Declare Function RegCreateKeyEx Lib "advapi32.dll" Alias _
"RegCreateKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, _
ByVal Reserved As Long, ByVal lpClass As String, ByVal dwOptions _
As Long, ByVal samDesired As Long, ByVal lpSecurityAttributes _
As Long, phkResult As Long, lpdwDisposition As Long) As Long
Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias _
"RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, _
ByVal ulOptions As Long, ByVal samDesired As Long, phkResult As _
Long) As Long
Declare Function RegQueryValueExString Lib "advapi32.dll" Alias _
"RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As _
String, ByVal lpReserved As Long, lpType As Long, ByVal lpData _
As String, lpcbData As Long) As Long
Declare Function RegQueryValueExLong Lib "advapi32.dll" Alias _
"RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As _
String, ByVal lpReserved As Long, lpType As Long, lpData As _
Long, lpcbData As Long) As Long
Declare Function RegQueryValueExNULL Lib "advapi32.dll" Alias _
"RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As _
String, ByVal lpReserved As Long, lpType As Long, ByVal lpData _
As Long, lpcbData As Long) As Long
Declare Function RegSetValueExString Lib "advapi32.dll" Alias _
"RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, _
ByVal Reserved As Long, ByVal dwType As Long, ByVal lpValue As _
String, ByVal cbData As Long) As Long
Declare Function RegSetValueExLong Lib "advapi32.dll" Alias _
"RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, _
ByVal Reserved As Long, ByVal dwType As Long, lpValue As Long, _
ByVal cbData As Long) As Long
Dim nKeys As Long, Delta As Long, XPos As Long, YPos As Long
Dim OriginalWindowProc As Long
Dim pthWnd As Long
Dim lLineNumbers As Long
Dim MainWindowHwnd As Long ' Main IDE window handle
Dim bHook As Boolean
Dim sLib As String
Dim hLib As Long
Public Function WindowProc(ByVal hWnd As Long, ByVal uMsg As Long, _
ByVal wParam As Long, ByVal lParam As Long) _
As Long
Select Case uMsg
Case WM_MOUSEWHEEL
nKeys = wParam And 65535
Delta = wParam / 65536 / WHEEL_DELTA
XPos = LowWord(lParam)
YPos = HighWord(lParam)
pthWnd = WindowFromPointXY(XPos, YPos)
' Get the scroll bar for this window and send the vscroll to it
Dim lret As Long
lret = EnumChildWindows(pthWnd, AddressOf EnumChildProc, lParam)
End Select
If OriginalWindowProc <> 0 Then
WindowProc = CallWindowProc(OriginalWindowProc, hWnd, uMsg, wParam, lParam)
End If
End Function
Public Sub UnHook()
'Ensures that you don't try to unsubclass the window when
'it is not subclassed.
If OriginalWindowProc = 0 Then Exit Sub
'Reset the window's function back to the original address.
Dim hr As Long
hr = SetWindowLong(MainWindowHwnd, GWL_WNDPROC, OriginalWindowProc)
If hr <> 0 Then
OriginalWindowProc = 0
bHook = False
Else
Debug.Print "Unable to unhook: SetWindowLong returns " & vbCrLf & hr & vbCrLf & Err.LastDllError
End If
End Sub
Public Sub Hook()
On Error GoTo Error
' GetLine Numbers
SystemParametersInfo SPI_GETWHEELSCROLLLINES, 0, lLineNumbers, 0
' Adjust just in case, otherwise we'll never get the scroll notification.
If lLineNumbers = 0 Then
lLineNumbers = 1
End If
OriginalWindowProc = SetWindowLong(MainWindowHwnd, GWL_WNDPROC, AddressOf WindowProc)
' Set a flag indicating that we are hooking
bHook = True
' Find out where we live on the filesystem
Dim lRetVal As Long
Dim sKeyName As String
Dim sValue As String
sKeyName = "CLSID\{B84F8C6E-BDDE-4384-9946-82EEE7F81D48}\InprocServer32"
sValue = QueryValue(sKeyName, "")
' If we found where we live let's increase our ref count so we can do our own cleanup later
If Len(sValue) > 0 Then
sLib = sValue
hLib = LoadLibrary(sLib)
End If
Exit Sub
Error:
Debug.Print "Unable to set hook: " & vbCrLf & Err.Description & vbCrLf & Err.LastDllError
End Sub
Function EnumChildProc(ByVal lhWnd As Long, ByVal lParam As Long) _
As Long
Dim RetVal As Long
Dim WinClassBuf As String * 255, WinTitleBuf As String * 255
Dim WinClass As String, WinTitle As String
Dim WinRect As RECT
Dim WinWidth As Long, WinHeight As Long
RetVal = GetClassName(pthWnd, WinClassBuf, 255)
WinClass = StripNulls(WinClassBuf) ' remove extra Nulls & spaces
RetVal = GetWindowText(lhWnd, WinTitleBuf, 255)
WinTitle = StripNulls(WinTitleBuf)
' see the Windows Class and Title for each Child Window enumerated
'Debug.Print " hWnd = " & Hex(lhWnd) & " Child Class = "; WinClass; ", Title = "; WinTitle
' You can find any type of Window by searching for its WinClass
Dim lret As Long
Dim i As Long
' Since we can have split windows we need to figure out which scroll bar to move.
' We can do this by comparing the Y position of the cursor against the vertical scrollbars
' that are children of the current window
Dim wi As WINDOWINFO
wi.cbSize = Len(wi)
If GetWindowInfo(lhWnd, wi) And WinClass <> "MDIClient" Then
If IsVerticalScrollBar(lhWnd) = True And wi.rcWindow.Top < YPos And wi.rcWindow.Bottom > YPos Then ' TextBox Window
If Delta > 0 Then ' Scroll Up
Do While i < Delta * lLineNumbers
lret = PostMessage(pthWnd, WM_VSCROLL, SB_LINEUP, lhWnd)
i = i + 1
Loop
Else ' Scroll Down
Do While i > Delta * lLineNumbers
lret = PostMessage(pthWnd, WM_VSCROLL, SB_LINEDOWN, lhWnd)
i = i - 1
Loop
End If
ElseIf IsHorizontalScrollBar(lhWnd) = True Then
If Delta > 0 Then ' Scroll Left
Do While i < Delta * lLineNumbers
lret = PostMessage(pthWnd, WM_HSCROLL, SB_LINELEFT, lhWnd)
i = i + 1
Loop
Else ' Scroll Right
Do While i > Delta * lLineNumbers
lret = PostMessage(pthWnd, WM_HSCROLL, SB_LINERIGHT, lhWnd)
i = i - 1
Loop
End If
End If
End If
EnumChildProc = bHook ' Continue enumerating the windows based on whether we are hooking or not
' It's possible that the addin has already been requested to unload and in such a case we will call free library on ourselves
' to reduce our ref count since we incremented it on our own so we can do a clean shutdown
If Not bHook Then
If Not FreeLibrary(hLib) Then
Debug.Print "Unable to FreeLibrary: " & Err.Number & vbCrLf & Err.LastDllError
End If
End If
End Function
Function EnumThreadProc(ByVal lhWnd As Long, ByVal lParam As Long) _
As Long
Dim RetVal As Long
Dim WinClassBuf As String * 255, WinTitleBuf As String * 255
Dim WinClass As String, WinTitle As String
On Error GoTo Error
RetVal = GetClassName(lhWnd, WinClassBuf, 255)
WinClass = StripNulls(WinClassBuf) ' remove extra Nulls & spaces
RetVal = GetWindowText(lhWnd, WinTitleBuf, 255)
WinTitle = StripNulls(WinTitleBuf)
' see the Windows Class and Title for top level Window
Debug.Print "Thread Window Class = "; WinClass; ", Title = "; _
WinTitle
EnumThreadProc = True
If InStr(1, WinTitle, "Microsoft Visual Basic") <> 0 _
And WinClass = "wndclass_desked_gsk" _
And MainWindowHwnd = 0 Then
MainWindowHwnd = lhWnd
' Setup the windows Hook
Hook
End If
Exit Function
Error:
MsgBox Err.Description
End Function
Public Function StripNulls(OriginalStr As String) As String
' This removes the extra Nulls so String comparisons will work
If (InStr(OriginalStr, Chr(0)) > 0) Then
OriginalStr = Left(OriginalStr, InStr(OriginalStr, Chr(0)) - 1)
End If
StripNulls = OriginalStr
End Function
Public Function IsVerticalScrollBar(hWnd As Long) As Boolean
' Check the style of the window specified by hWnd to see if it's a vertical scrollbar
Dim wi As WINDOWINFO
wi.cbSize = Len(wi)
If GetWindowInfo(hWnd, wi) Then
If (wi.dwStyle And WS_VISIBLE) > 0 And (wi.dwStyle And SBS_VERT) > 0 Then
IsVerticalScrollBar = True
Exit Function
End If
End If
IsVerticalScrollBar = False
End Function
Public Function IsHorizontalScrollBar(hWnd As Long) As Boolean
' Check the style of the window specified by hWnd to see if it's a horizontal scrollbar
Dim wi As WINDOWINFO
wi.cbSize = Len(wi)
If GetWindowInfo(hWnd, wi) Then
If (wi.dwStyle And WS_VISIBLE) > 0 And (wi.dwStyle And SBS_HORZ) > 0 Then
IsHorizontalScrollBar = True
Exit Function
End If
End If
IsHorizontalScrollBar = False
End Function
Private Function QueryValue(sKeyName As String, sValueName As String) As Variant
Dim lRetVal As Long 'result of the API functions
Dim hKey As Long 'handle of opened key
Dim vValue As Variant 'setting of queried value
lRetVal = RegOpenKeyEx(HKEY_CLASSES_ROOT, sKeyName, 0, KEY_QUERY_VALUE, hKey)
lRetVal = QueryValueEx(hKey, sValueName, vValue)
RegCloseKey (hKey)
QueryValue = vValue
End Function
Public Function SetValueEx(ByVal hKey As Long, sValueName As String, lType As Long, vValue As Variant) As Long
Dim lValue As Long
Dim sValue As String
Select Case lType
Case REG_SZ
sValue = vValue & Chr$(0)
SetValueEx = RegSetValueExString(hKey, sValueName, 0&, lType, sValue, Len(sValue))
Case REG_DWORD
lValue = vValue
SetValueEx = RegSetValueExLong(hKey, sValueName, 0&, lType, lValue, 4)
End Select
End Function
Function QueryValueEx(ByVal lhKey As Long, ByVal szValueName As String, vValue As Variant) As Long
Dim cch As Long
Dim lrc As Long
Dim lType As Long
Dim lValue As Long
Dim sValue As String
On Error GoTo QueryValueExError
' Determine the size and type of data to be read
lrc = RegQueryValueExNULL(lhKey, szValueName, 0&, lType, 0&, cch)
If lrc <> ERROR_NONE Then Error 5
Select Case lType
' For strings
Case REG_SZ:
sValue = String(cch, 0)
lrc = RegQueryValueExString(lhKey, szValueName, 0&, lType, _
sValue, cch)
If lrc = ERROR_NONE Then
vValue = Left$(sValue, cch - 1)
Else
vValue = Empty
End If
' For DWORDS
Case REG_DWORD:
lrc = RegQueryValueExLong(lhKey, szValueName, 0&, lType, _
lValue, cch)
If lrc = ERROR_NONE Then vValue = lValue
Case Else
'all other data types not supported
lrc = -1
End Select
QueryValueExExit:
QueryValueEx = lrc
Exit Function
QueryValueExError:
Resume QueryValueExExit
End Function
Private Function LowWord(ByVal inDWord As Long) As Integer
LowWord = inDWord And &H7FFF&
If (inDWord And &H8000&) Then LowWord = LowWord Or &H8000
End Function
Private Function HighWord(ByVal inDWord As Long) As Integer
HighWord = LowWord(((inDWord And &HFFFF0000) \ &H10000) And &HFFFF&)
End Function AndreRet 526 Senior Poster
Have you follow the methods as MS suggested?
Method 1
Download the VB6 Mouse Wheel.exe file that includes the add-in DLL and the code that is used to create the add-in DLL.
Download the VB6 Mouse Wheel.exe file. The following file is available for download from the Microsoft Download Center:
Download the VB6MouseWheel.EXE package now.For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Click Start, click Run, type regsvr32 <path>\VB6IDEMouseWheelAddin.dll, and then click OK.
Start Visual Basic 6.0.
Click Add-Ins, and then click Add-in Manager.
In the Add-in Manager list, click MouseWheel Fix.
Click to select the Loaded/Unloaded check box, and then click to select the Load on Startup check box.
Click OK.
This method makes the mousewheel scroll event available if you have loaded it correctly. To try this, add a combo box to your application and add at least 50 items to it. When in run mode, click on the combo box, and then use the mouse wheel to scroll down.
Another way, add a text box and add multi lines to it with horizontal scroll bars. Run and now scroll on the text box, Viola, it scrolls.:)
This should now be your solution. Let me know if you could get this sorted.:)
daniwaber 0 Light Poster
Dear AndreRet
As per your advice I have marked Report scroll as Solved.
With mouseWheelFix combo box and text box scrolls but DataCombo, DataList, Report doesnot scroll in runtime. Thanks
AndreRet 526 Senior Poster
It is because it does not support mouse functions. The only way would be to interact with them via API calls, which I don't even want to get in here, ITS BIG.;)
You can use the code I supplied above, that should help you get the correct solution. I would personally just use a normal combo box, works as fine as a data combo.
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