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Spin control... yet again

Posted on 1998-10-01
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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....?
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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.
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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...
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Author Comment

by:rose3377
ID: 1174138
See Comment Above...
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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
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