Update only a particial area of a View with UpdateAllViews(...) - C / C++ / MFC Discussion Boards

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Re: SECURITY_ATTRIBUTES in threading

Peter Weyzen11-Jul-08 13:56

Peter Weyzen

11-Jul-08 13:56

Without context, I wasn't sure what you were talking about. Googling your statement, reveals that this is part of "CreateThread".

Is that what you are asking about?

It sounds like you can pass security rights to a thread and give it the same rights you have acquired somewhere else?

From: http://msdn.microsoft.com/en-us/library/ms682453(VS.85).aspx[^]

HANDLE WINAPI CreateThread(
__in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes,
__in SIZE_T dwStackSize,
__in LPTHREAD_START_ROUTINE lpStartAddress,
__in_opt LPVOID lpParameter,
__in DWORD dwCreationFlags,
__out_opt LPDWORD lpThreadId
);

lpThreadAttributes [in, optional]
A pointer to a SECURITY_ATTRIBUTES structure that determines whether the returned handle can be inherited by child processes. If lpThreadAttributes is NULL, the handle cannot be inherited.

The lpSecurityDescriptor member of the structure specifies a security descriptor for the new thread. If lpThreadAttributes is NULL, the thread gets a default security descriptor. The ACLs in the default security descriptor for a thread come from the primary token of the creator.

Windows XP/2000: The ACLs in the default security descriptor for a thread come from the primary or impersonation token of the creator. This behavior changed with Windows XP SP2 and Windows Server 2003. For more information, see Remarks

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

Re: SECURITY_ATTRIBUTES in threading

zildjohn0111-Jul-08 14:14

zildjohn01

11-Jul-08 14:14

just use NULL. if you don't understand that you don't need to worry about security. your threads will be fine

CCheckListBox in release mode, Windows XP in Windows classic theme

tsvdevteam11-Jul-08 5:31

tsvdevteam

11-Jul-08 5:31

Hi,

I'm a bit desperate... so I'll do the old Police thing ... S.O.S

We work on an application that has been up and running for several years now - MFC based, links with Stingray. Until recently, CCheckListBoxes worked nice and easy. A new version is about to be released and we just realized that these "@!*!# check listboxes were not displaying strings in release mode running on WindowsXP, when the display is in "Windows 2000 (classic)" theme. The string ARE there, we just can't see them.

In between versions we have split up our app into 4 dll's.. but I still don't get it, it's basically the same code....

Any help, idea or creative suggestion to commit suicide is very much welcome....

Thanks

PS. I built a small test dialog application, and it works. Seems to be a bit more complicated...

[OT] Re: CCheckListBox in release mode, Windows XP in Windows classic theme

David Crow11-Jul-08 6:08

David Crow

11-Jul-08 6:08

tsvdevteam wrote:
I'm a bit desperate... so I'll do the old Police thing ... S.O.S

But it needs to be in a bottle.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: CCheckListBox in release mode, Windows XP in Windows classic theme

bob1697211-Jul-08 7:42

bob16972

11-Jul-08 7:42

I had that problem with plain Visual C++ 6.0 MFC apps. I tried various things and got numerous false positives. I finally gave up trying to use CCheckListBoxes with Visual C++ 6.0 and any app that needed them, I moved to Visual C++ 2003.

I'm not sure if that helps but I thought I'd pass on the fact that I fought the good fight for a reasonable amount of time but never found that magic fix that worked on 2000, XP, Vista, Theming enabled/disabled etc...

Re: CCheckListBox in release mode, Windows XP in Windows classic theme

tsvdevteam11-Jul-08 9:03

tsvdevteam

11-Jul-08 9:03

Well, that is fine for the source code I write myself. I did write a class to avoid using the faulty one. But, Stingray (Roguewave) uses the bad class in their customize toolbar dialog. I could mess with their source code, but I'd like to avoid doing so.

Thank you for the info !

Re: CCheckListBox in release mode, Windows XP in Windows classic theme

Bram van Kampen12-Jul-08 14:47

Bram van Kampen

12-Jul-08 14:47

That explains it All
I was just wondering what Stingray was about to do to your code\n
Advice: Before you throw a party for fellow students, LOCK UP YOUR COMPUTER

WTF | :WTF:

Regards

Bram van Kampen

Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 4:55

CrocodileBuck

11-Jul-08 4:55

Hi,

i want to update only a part of a view with UpdateAllViews().
I read that the simpliest way is to call UpdateAllViews() from the doc and pass a CRect to the view's OnUpdate().
The rect which is passed to the view's OnUpdate() ist the part which is updated.

But it wont work Cry | :((

, I tried it for some hours now, could you helpme? Confused | :confused:

Perhaps you know a tut which covers this problem i only found the simple UpdateAllViews(NULL)samples ?

Here is some source from me which updates the whole view doc.cpp:

CString CMyDoc::LoadFile(CString cstrSearchString, CString *ptrArrFileNames, CString cstrFileExtension, int iZaehler)
{
	m_iZaehler = iZaehler;
	ptrMlf->loadmyfile (cstrSearchString + m_ptrArrFileNames[iZaehler],cstrFileExtension);
	m_cstrText = ptrMlf->lf_cstrText;

	UpdateAllViews(NULL); // Calls OnUpdate of the view and updates the whole view !!!

	return m_cstrAusgabe;
}

Here the code from the view.cpp:

void CMyView::OnUpdate(CView* pSender, LPARAM lHint, CObject* pHint) 
{
	CTheReaderDoc	 *pDoc	= GetDocument ();
	CRichEditCtrl	 &rCtrl = GetRichEditCtrl();	
	rCtrl.SetWindowText (pDoc->m_cstrAusgabe);
	rCtrl.SetFont(pDoc->m_ptrFont);
	rCtrl.SetModify(TRUE);	
}

Many thanx & best regards
Wink | ;)

ShadowEater

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 5:05

Mark Salsbery

11-Jul-08 5:05

UpdateAllViews() gives you TWO parameters that get passed to all the
CView::OnUpdate() calls.

What about passing a pointer to a CRect in one of those paramters?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

led mike11-Jul-08 5:18

led mike

11-Jul-08 5:18

CrocodileBuck wrote:
I read that the simpliest way is to call UpdateAllViews() from the doc and pass a CRect to the view's OnUpdate().
The rect which is passed to the view's OnUpdate() ist the part which is updated.

But it wont work , I tried it for some hours now

The code you posted is not trying to use a CRect so how are we supposed to know what you are trying that is not working? Confused | :confused:

led mike

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 5:27

CrocodileBuck

11-Jul-08 5:27

Thx for yor quick replies,

here the code which tries to pass a pointer to CRect:

Doc.cpp:

CString CMyDoc::LoadFile(CString cstrSearchString, CString *ptrArrFileNames, CString cstrFileExtension, int iZaehler)
{
	m_iZaehler = iZaehler;
	ptrMlf->loadmyfile (cstrSearchString + m_ptrArrFileNames[iZaehler],cstrFileExtension);
	m_cstrAusgabe = ptrMlf->lf_cstrAusgabe;

	CRect *MyRect;
	MyRect(100, 100, 100, 100);
	CObject* pHint = NULL;
	pHint = reinterpret_cast<cobject*>(MyRect);

	UpdateAllViews(NULL, 1, pHint);

	return m_cstrAusgabe;
}

Many many thanx and best regards
Croc

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 5:31

Mark Salsbery

11-Jul-08 5:31

That code compiles?

Maybe try something simpler:

CRect MyRect(100, 100, 100, 100);
CObject* pHint = (CObject*)&MyRect;

UpdateAllViews(NULL, 1, pHint);

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 5:46

CrocodileBuck

11-Jul-08 5:46

Thanx,

it will work, i could now pass the CRect!
Simple is Simply the best way Wink | ;)

But do you know what i have to do in the OnUpdate of the viw.cpp ?
The view will not automatically update only the rect area ?
I men when i print text in my view and then load new text my version of UpdateAllViews should only update the rect ???

But how?

Sorry for my stupid question Confused | :confused:

but i m really confused !

Many thanx
Croc

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 6:05

Mark Salsbery

11-Jul-08 6:05

A simple call to InvalidateRect() in your OnUpdate() overrides should do it.

void CMyView::OnUpdate(CView* pSender, LPARAM /*lHint*/, CObject* pHint)
{
   InvalidateRect((CRect*)pHint, TRUE);
}

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 6:16

CrocodileBuck

11-Jul-08 6:16

Hi Mr. Salsbery,

i tried

InvalidateRect((LPCRECT)pHint, TRUE);

but it won't work Frown | :(

Thanx for all your help
Croc

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 6:29

Mark Salsbery

11-Jul-08 6:29

What does "won't work" mean?

If you're using a rect of (100,100,100,100) then nothing will
happen, since the rect has no dimensions (width and height are 0).

Try a valid rect! Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 6:33

CrocodileBuck

11-Jul-08 6:33

Hi,
yes thats right but i tried it with

CRect MyRect(0,0, 200, 150);
CObject* pHint = (CObject*)&MyRect;

and this fails too!

Manx thanx and best regards
Croc

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 6:36

Mark Salsbery

11-Jul-08 6:36

What does "fails" mean?

Doesn't compile? Crashes at runtime? Nothing happens?

It marks the area for updating. The next WM_PAINT message will
update that area. If the same exact data is drawn as on the last WM_PAINT,
you're not going to see a difference.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 6:44

CrocodileBuck

11-Jul-08 6:44

I Mean nothin happens!

Ahhh the InvalidateRect() hasn't to do something with the text printed in the RTFCtrl on the View ???!!!

What can i do that i can see a little difference ?????

Many many thanx for your help and best regards
Smile | :)

Croc

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 6:48

Mark Salsbery

11-Jul-08 6:48

CrocodileBuck wrote:
What can i do that i can see a little difference ?

You need to change something between calls to UpdateAllViews() if
you want to see something different in the view. What are your views
drawing? Something from the document? If so, change the document.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 6:52

CrocodileBuck

11-Jul-08 6:52

I will only print Text (SetWindowText) in the View !!!????

Many many thanks and best regards
Croc

Re: Update only a particial area of a View with UpdateAllViews(...)

Mark Salsbery11-Jul-08 6:59

Mark Salsbery

11-Jul-08 6:59

Only you know what's going on in your views.

The text data must be coming from somewhere...
Change it and update the views!
And make sure changing it doesn't already cause an update implicitly,
or you still won't see anything.

If the view is a window not in your control (where you don't do the painting,
like an edit control), then you may not have control over updating regions of
the window.

If you are doing the painting in your view, look at the invalid rect in the WM_PAINT
handler - you should see that your update rect is there. What you do with that info in
your painting code is up to you.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Update only a particial area of a View with UpdateAllViews(...)

CrocodileBuck11-Jul-08 7:04

CrocodileBuck

11-Jul-08 7:04