Re: Application Hangs when going through CPropertySheet OnInitDialog f

gag <>
Fri, 6 Mar 2009 06:55:26 -0800 (PST)
On Mar 5, 10:56 am, ZaZy <> wrote:

gag ha scritto:

On Feb 27, 1:40 pm, ZaZy <> wrote:

gag ha scritto:

On Feb 27, 7:06 am, ZaZy <> wrote:

gag ha scritto:

On Feb 9, 9:07 pm, RainMan <Rain...@online.nospam> wrote:

OS does not really matter. Modify property sheet extended style=


If not set property sheet has a problem restoring control's focu=

s after

focus was switched from a property page to another window or contr=


Property page ends up in an endless loop once it hits property she=

et. It

cannot find any control since default property sheet style does no=

t have

WS_EX_CONTROLPARENT will cause property sheet to be treated as ano=


control when embedded in another window and allow for tabbing thro=


property sheet controls and property pages without any problem.
"gag" wrote:

Hi all,
We have an application that hangs for some users who are running =

XP sp

3 and Vista. The application is a MFC dialog with a CPropertyShee=


which contains two CPropertyPages on the dialog. It looks like th=


application goes into the CPropertySheet OnInitDialog and never
returns. When I look in the task manager it shows that it is stil=


This hang only happens for some users. For those users I have had=


start up in safe mode and the app will successfully launch. It se=


like there maybe some conflict with another app that is running.
The real hassle is that I cannot recreate it at work or at home t=

o try

to work on it.
Does anyone have any suggestions? I am running out of things to t=


Any help would be greatly appreciated.
Thank you in advance!
Greg- Hide quoted text -

- Show quoted text -

We are setting this styel already. I read that setting the
WS_EX_CONTROLPARENT before the CPropertySheet::onInitDialog call co=


cause this problem. I also read that setting it after the onInitDia=


could also cause the endless loop. I have tried both and do not kno=


where to go from here.

Dave, just try this:
BOOL CMyPropertySheet::PreTranslateMessage(MSG* pMsg)
        if( pMsg->message == WM_GETDLGCODE)


                return FALSE;
        return CPropertySheet::PreTranslateMessage(pMsg);
And remember that the MyPropertySheet instance should not be child o=

f a

This simply tells to do not dispatch that damned message and SHOULD =


my casa HAS) solve the problem.
Try and please let us know!
ZaZy- Hide quoted text -
- Show quoted text -

Still having the problem. The property sheet is not a child of any
control. It is put onto CDialog object. I use the following code.
      m_appPropSheet.EnableStackedTabs( FALSE );
      m_appPropSheet.Create(this, WS_CHILD | WS_VISIBLE , 0);
     m_appPropSheet.ModifyStyleEx (0, WS_EX_CONTROLPARENT);
      m_appPropSheet.ModifyStyle( 0, WS_TABSTOP);
      m_appPropSheet.SetWindowPos(NULL, 0, 0, 0, 0,
                   SWP_NOZORDER | SWP_NOSIZE | SW=


Is this code causing the problem?
I am really stuck on this and our clients are getting impatient

Hi greg,

Your code appears get no problems other than the fact that the
ModifyStyleEx is not in the oninit of the derived class.
I suppose that m_appPropSheet is of type CMyPropertySheet in suggestin=


you these add (i include also the pretranslatemessage that had been
already posted)

void CMyPropertySheet::OnKillFocus(CWnd* pNewWnd)
        // This takes focus away from the propertysheet (this =

is one of the

causes of loop)



BOOL CMyPropertySheet::OnInitDialog()
        ModifyStyleEx(0, WS_EX_CONTROLPARENT);
        return TRUE;


BOOL CMyPropertySheet::PreTranslateMessage(MSG* pMsg)
        if( pMsg->message == WM_GETDLGCODE)


                return FALSE;
        return CPropertySheet::PreTranslateMessage(pMsg);


Another try you can do is to move the ModifyStyleEx contained in the
OnInitDialog BEFORE the CPropertySheet::OnInitDialog.
This solved all my PropertySheets problems.
Hoping this helps.
Let us know- Hide quoted text -

- Show quoted text -

In the code we have tried moving the ModifyStyleEx (0,
WS_EX_CONTROLPARENT); call before the CPropertySheet::onInitDialog
call and when we create the property sheet,

None of these changes have worked.



If you can provide an "extract" of the code that generates the dialog so
that it could be better analized i can give it a look also with spy++
(Win XP SP3 & much virtual machines). Also a list of running processes
on the machine that are having trouble is a good help.- Hide quoted text =


- Show quoted text -

Hi All,

I found the problem. It had nothing to do with the property sheet
initialization. We were making a couple of sendMessage calls with user
defined messages. We were using the HWND_BROADCAST parameter instead
of the handle to our top level window. I think since the message was
broadcast to every top level window, it was being caught be some other
app. I changed it to call PostMessage and used the handle to our top
level window and now it works just fine.

Thank you all for your help!


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