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Problems updating CPropertSheet.

Posted on 1998-11-16
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Last Modified: 2013-11-20
I´ve created a CDialog based app. And in Init Dialog I use this code:
PropertySheet.AddPage(&StartMenuDlg);
PropertySheet.AddPage(&DesktopDlg);
PropertySheet.Create(this, WS_CHILD | WS_VISIBLE, 0);
PropertySheet.ModifyStyleEx ( 0,WS_EX_CONTROLPARENT );
PropertySheet.ModifyStyle ( 0,WS_TABSTOP );

So the Property sheet are added on the main dialog. I´v made 2 Dialogs which are the 2 tabs. Now I have a button on the main dialog on when it´s clicked I need to use UpdateData(TRUE) so that the variables will recive the right value. If I use UpdateData on the sheet that are visible on top - No Problem. Then when I use it on the sheet thats not visible, the bottom one the app crashes. Can anyone help me out how I can update my variables in both my "dialog" sheets. I´m quite new at MFC so a easy answer would help me alot.
Thanx...
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Question by:joakimf
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by:joakimf
ID: 1324763
Adjusted points to 70
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n023y earned 70 total points
ID: 1324764
CPropertySheet includes some efficiency where the pages are not created until they are switched to. Therefore you are attempting to access a window that does not exist.
Two options are availble to you

1. Handle the fact that your window may not exist, by performing the following
In the DoDataExchange routine,
void DesktopDlg::DoDataExchange(CDataExchange *pDX)
{
   if (!::IsWindow(m_hWnd))
      return;
   //your data exhcange calls go here...
}
and perform the initial varaible value update in the constructor or InitDialog of the property page class

2. The slower alternative is to make sure that all pages are created by calling a code fragment similar to the following

//switch off redraw to prevent screen flicker PropertySheet.SetRedraw(FALSE);  

//load each page
for (int nLoop = PropertySheet.GetPageCount() - 1; nLoop >= 0; nLoop--)
{
    PropertySheet.SetActivePage(nLoop);
}

//reallow painting of property sheet
PropertySheet.SetRedraw(TRUE);

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by:joakimf
ID: 1324765
Thank you for that excellent answer...
Enjoy the points..
//joakimf
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