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Why does my application assert on File->New ?

Posted on 2004-04-18
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Last Modified: 2013-11-20
Please have a look at my project here:

http://mr_wad_99.europe.webmatrixhosting.net/Gui4UnexTEST.zip

I asked other questions regarding eliminating flicker in my child windows, but the answers also introduced this asserting when the user creates a new document.  

The (skinned down for this question) app displays web pages in tabs.  On startup it displays Yahoo! just for demonstration of the flickering.  The code asserts in Wincore.cpp at the line

ASSERT(wndcls.style == nClassStyle);

I have deduced that the problem is down to the line

SetClassLong(m_hWnd, GCL_STYLE, GetClassLong(m_hWnd, GCL_STYLE) & ~(CS_HREDRAW | CS_VREDRAW));

that is contained within CChildFrame::OnCreate

Without this, no assertion but flicker.  With it, assertion but no flicker.  

I have no idea why this is, maybe you will ?

I know it is only a debug assertion error, and it does not happen in the release build, but I still think it should be sorted out !

TIA !
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Question by:mrwad99
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Expert Comment

by:AlexFM
ID: 10852913
Cannot reproduce this assertion - maybe installing the latest Visual Studio Service Pack and latest Microsoft SDK can help.
I just guess - try to add this line to CChildFrame::PreCreateWindow

cs.style &= (~(CS_HREDRAW | CS_VREDRAW));

Maybe in this case wndcls.style will be equal to nClassStyle, and MFC will be happy.
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by:mrwad99
ID: 10852916
Did you uncomment the line

SetClassLong(m_hWnd, GCL_STYLE, GetClassLong(m_hWnd, GCL_STYLE) & ~(CS_HREDRAW | CS_VREDRAW));

?
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Expert Comment

by:AlexFM
ID: 10852923
Yes, I uncommented it in CChildFrame::OnCreate, and this removes flickering. But there is no assertion.
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Author Comment

by:mrwad99
ID: 10852954
OK that is crazy.  I am using VC++6.0 with SP5, and when I have taken the debug version of the app elsewhere on machines that do not have this installed I still get the assertion:

http://mr_wad_99.europe.webmatrixhosting.net/Evidence.jpg

What version of VS are you running ?

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Author Comment

by:mrwad99
ID: 10852960
Sorry, and adding

cs.style &= (~(CS_HREDRAW | CS_VREDRAW));

does not help.

(Updated zip file to give assertion immediately)
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Expert Comment

by:AlexFM
ID: 10853016
VC 6.0 with SP5. Well, wait for somebody who can reproduce this problem.
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Expert Comment

by:AlexFM
ID: 10853036
OK, I reproduced this. You didn't write that assertion appears after File - New command. I will try to do something.
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AlexFM earned 500 total points
ID: 10853319
It was really interesting. To solve the problem, open Resource View and remove the IDR_GUI4UNTYPE icon from it (don't ask me why, just read MFC source code in the function which call asserting function...). Program works without assertion now.

However, after removing the icon we get wrong icon in the child frame. To restore it, add the same icon to the resources, but give other ID to it (for example, IDI_ICON1). Add new line to CChildFrame::OnCreate:

    SetClassLong(m_hWnd, GCL_STYLE, GetClassLong(m_hWnd, GCL_STYLE) & ~(CS_HREDRAW | CS_VREDRAW));

    SetIcon(LoadIcon(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDI_ICON1)), FALSE);   // add this line
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by:mrwad99
ID: 10853337
Marvelous.  Thanks a load for that.  

You learn something new every day eh ?

:)
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