Dialog opens properly in winxp, but Freezes in win98se

This is a discussion on Dialog opens properly in winxp, but Freezes in win98se within the C++ Programming forums, part of the General Programming Boards category; "MyDlg" is a dialog class derived from CDialog "pg_price" is a derived CPropertyPage on pressing a button pg_price(derived from CPropertyPage), ...

  1. #1
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    Dialog opens properly in winxp, but Freezes in win98se

    "MyDlg" is a dialog class derived from CDialog
    "pg_price" is a derived CPropertyPage

    on pressing a button pg_price(derived from CPropertyPage), domodal is called
    Code:
    void pg_price::OnBUTTON() 
    {
    	MyDlg MyDlg_obj;
    	MyDlg_obj.DoModal();
    }

    OnInitDialog of MyDlg (derived from CDialog):
    Code:
    BOOL MyDlg::OnInitDialog() 
    {
    	CDialog::OnInitDialog();
    	return TRUE;  // return TRUE unless you set the focus to a control
    	              // EXCEPTION: OCX Property Pages should return FALSE
    }
    now, the problem is that on winxp there isnt any problem. MyDlg_obj.DoModal(); displays the resource of MyDlg

    but on win98se, the whole application hangs and become non-responsive upon clicking the button
    MyDlg never appeared

    so i ran a debugger and found out that the application has no problem running up to "BOOL MyDlg::OnInitDialog()" and returns it without any problem. I hit "f5" again and the application hangs. no assert/buffer overflow problems error messages were given, the whole application simply hangs there. i believe that's because the user interface thread got into something it cant get out of

    doing a "step over" on the debugger in win98se i got the following
    http://img182.imageshack.us/img182/7687/step4em.gif

    doing a "step over on debugger in winxp
    http://img34.imageshack.us/img34/9697/winxp0ok.jpg


    i really got no idea how this happened
    how is it possible that this app works well on winxp but not win98se?
    i need that application on win98se platform

    using vc++6.0 SP6
    win98se/winxp

    please assist
    Last edited by hanhao; 07-09-2005 at 11:16 PM.

  2. #2
    Frequently Quite Prolix dwks's Avatar
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    Perhaps you run out of memory.
    dwk

    Seek and ye shall find. quaere et invenies.

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  3. #3
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    Quote Originally Posted by dwks
    Perhaps you run out of memory.
    perhaps...
    but i dont think so
    winxp and win98se are ran on the same computer (with 2 different drives)
    i also ran the same program on other independent computers (my friends') and it gives the same result

    most likely it's the main user interface thread got stuck some where and hence the application freezes
    i got no idea how to address this problem

  4. #4
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    after some research, i discovered that because the button was located on a CPropertySheet and the domodal is launch from it
    this CPropertySheet is one of the pages in the tabs area
    this tab area is on my main dialog

    anyone have problems doing domodal on CPropertySheet ?
    how to solve this problem?

  5. #5
    Registered User
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    problem solved

    there's a stupid bug in MFC CPropertySheet for win98se
    can be fixed by shifting keyboad focus away from any control objects on propertysheet
    ::setfocus( topwindow_hwnd)

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