Solved

Vertical scrolling.

Posted on 2001-06-05
7
285 Views
Last Modified: 2013-11-20
One of the parameters of CWnd::OnHScroll is nPos which Specifies the scroll-box position. In my application, the range that the scroller can be changed is very large. It can get over 100,000. The problem is that nPos is defined as UINT. In such cases, when I drag the slider over the 32,768 position, the nPos get garbage values.
Is there any way to overcome this annoying behaviour?
0
Comment
Question by:eyala
7 Comments
 
LVL 1

Expert Comment

by:AndreasF
ID: 6156814
As far as I know you can only set the range to the maximum possible and recalculate nPos with an algorithm like
nActualPosition = (nPos/32768)*100000;

Greetings
Andi
0
 
LVL 1

Expert Comment

by:guoching
ID: 6157475
Use GetScrollPos in CWnd::OnHScroll to get a 32-bit position.
0
 
LVL 1

Expert Comment

by:guoching
ID: 6157480
If you want to use the nPos, you can get the actual position by :
if(((int)nPos) < 0)      // nPos < 0 if over 32767
     x = 32767+(32767-((int)nPos));  
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 1

Expert Comment

by:guoching
ID: 6157482
If you want to use the nPos, you can get the actual position by :
if(((int)nPos) < 0)      // nPos < 0 if over 32767
     nPos = 32767+(32767-((int)nPos));  
0
 

Author Comment

by:eyala
ID: 6158742
This only increase my range to 32767 * 2. I need much largr range than that. Is it possible?
0
 
LVL 3

Accepted Solution

by:
GlennDean earned 200 total points
ID: 6159284
To get the full 32-bit scroll position you have to use the GetScrollInfo function!
SCROLLINFO si;
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_RANGE;
GetScrollInfo(hwnd,SB_VERT,&si);
//Get the 32-bit scroll postion
int nPos = si.nPos;
0
 

Author Comment

by:eyala
ID: 6159761
thanks, you showed me the way, but I think more accurate way to do it is like this:

SCROLLINFO si;
si.fMask = SIF_ALL;
GetScrollInfo(SB_HORZ, &si);
nPos = si.nTrackPos;
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
CRON statement to run every 3 minutes except on Monday morning 12am to 2am 7 89
string initialization in java 11 110
ShiftLeft challenge 21 76
Detect file exist or not 3 133
Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now