Solved

Spin control... yet again

Posted on 1998-10-01
7
344 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
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
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

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

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Question has a verified solution.

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

In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

728 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