GetScrollInfo

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2 total messages Started by Raphael Boos Wed, 28 Oct 1998 00:00

Author: Raphael Boos
Date: Wed, 28 Oct 1998 00:00

48 lines
1950 bytes

In VB5 I don't receive any results when using the GetScrollInfo for a
treeview in a control array. A call like

    Dim scInfo As SCROLLINFO
    scInfo.fMask=SIF_ALL        'or any other valid SIF constant
    GetScrollInfo(trv(1).hwnd,SB_HORZ,scInfo)

always returns zero/False no matter if the Treeview has Scrollbars or
not. I also tried declaring the lpScrollInfo ByRef but it did not work.
Any ideas?



I used the following declarations:

Declare Function GetScrollInfo Lib "user32" (ByVal hwnd As Long, _
                                             ByVal n As Long, _
                                             lpScrollInfo As SCROLLINFO)
As Long


Public Type SCROLLINFO
   cbSize As Long
   fMask As Long
   nMin As Long
   nMax As Long
   nPage As Long
   nPos As Long
   nTrackPos As Long
End Type

Public Const SB_BOTH = 3
Public Const SB_HORZ = 0
Public Const SB_VERT = 1

Public Const SIF_RANGE = &H1              '0x0001
Public Const SIF_PAGE = &H2               '0x0002
Public Const SIF_POS = &H4                '0x0004
Public Const SIF_DISABLENOSCROLL = &H8    '0x0008
Public Const SIF_TRACKPOS = &H10          '0x0010
Public Const SIF_ALL = SIF_RANGE Or SIF_PAGE Or SIF_POS Or SIF_TRACKPOS



Thanks in advance

Raphael Boos
smorp@t-online.de

Re: GetScrollInfo

Author: Chris Eastwood
Date: Wed, 28 Oct 1998 00:00

22 lines
1287 bytes

Hi

Raphael Boos wrote in message <3636ED3B.CD348B8E@w-4.de>...
>In VB5 I don't receive any results when using the GetScrollInfo for a
>treeview in a control array. A call like
>
>    Dim scInfo As SCROLLINFO
>    scInfo.fMask=SIF_ALL        'or any other valid SIF constant
>    GetScrollInfo(trv(1).hwnd,SB_HORZ,scInfo)
>
<Snip>

The GetScrollInfo API Call will only get scroll information from a ScrollBar
window - you'll need to get the handle of the Horizontal Scrollbar contained
within the TreeView for this to work.


Regards

Chris Eastwood
Software Engineer
ACNielsen Ltd

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