Solved

Spin control... yet again

Posted on 1998-10-01
7
331 Views
Last Modified: 2008-02-07
Me again,
Something is going wrong... refer to the history of the question...
I inserted this into OnInitDialog...
OnVScroll(SB_THUMBPOSITION,m_spin1,NULL)
It compiles and crashes...oops!
When I debug, it perfroms that line and goes to OnVScroll and gets hit somewhere around if(bla bla bla)
HELP PLEEZ... I am now getting desperate
Thanx
0
Comment
Question by:rose3377
7 Comments
 

Author Comment

by:rose3377
ID: 1174135
Does this problem have something to do with the fact that the dialog is not yet displayed and all the DDV,DDX stuff?

Another thing...
If I overlook the inital display problem and I continue, when I press up arrow, it increments in 0.1 which is great.
If I type in 12 and press up arrow, it becomes 1.3
How do I correct this....?
0
 

Expert Comment

by:tsauy
ID: 1174136
Yes, you need to wait until the window is ready to display. You can put OnVScroll() in OnPaint(). If you don't want to reload OnVScroll() afterwards, which means you only want to run once when the window starts, you need a flag to disable it, such as:
void YouClass::OnPaint()
{
   .
   .
   static bool RunOnceFlag=false;
  if(!RunOnceFlag) {
     OnVScroll();
     RunOnceFlag=true;
  }
}

Answer to second question: You could use integer and then devided by 10.
0
 

Author Comment

by:rose3377
ID: 1174137
Refer to the history of the question in titled Spin Control again
I placed that code in OnPaint. The program gets to OnVScroll...

   CString strValue;
   strValue.Format("%3.1f", (double) nPos / 10.0);
***((CSpinButtonCtrl*) pScrollBar)->GetBuddy()
                           ->SetWindowText(strValue);

and crashes on the line with stars...
0
Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

 

Author Comment

by:rose3377
ID: 1174138
See Comment Above...
0
 
LVL 2

Expert Comment

by:jrmcg
ID: 1174139
Yours:

       ***((CSpinButtonCtrl*) pScrollBar)->GetBuddy()
           ->SetWindowText(strValue);

There should be parenthesis around the GetBuddy function.  Remember, it is returnin a CWnd*.

Try:::
(((CSpinButtonCtrl*)pScrollBar)->GetBuddy())->SetWindowText(strValue);

Does that do it?
0
 
LVL 11

Accepted Solution

by:
mikeblas earned 0 total points
ID: 1174140
The extra parenthesis that jrmcg suggests aren't required.  (Read a book on C++ for details.)

B ekiM

0
 
LVL 11

Expert Comment

by:mikeblas
ID: 1174141
Calling a notification function directly, like tsauy suggests to do with OnVScroll() directly from OnPaint(), is completely sick and wrong.  If you're unlucky, it will actually work and you'll be fooled until your users upgrade to a new verison of windows and it breaks.  Nominally, it'll cause a crash.

Don't do it; it's wrong.

B ekiM
0

Featured Post

U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

Question has a verified solution.

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

  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

777 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