C / C++ / MFC

27-Jan-09 0:45

Hello Community,
i need to check if users have change the selection in CListCtrl,
i have now this if users change selection with the mouse(mouse click),
but the selection change is posible with the arrow keys too!

How to check this event: user change selection with arrow keys in CListCtrl,
i need to do some updates if there is a new selection in CListCtrl??

Thanks for any help!!
termal

Nishad S27-Jan-09 2:51

Nishad S

27-Jan-09 2:51

termal wrote:
How to check this event: user change selection with arrow keys in CListCtrl

Make the use of LVN_ITEMCHANGED notification.

- ns ami -

bosfan27-Jan-09 3:23

27-Jan-09 3:23

Hello,
thanks for answer, i try this way!

regards
termal

Re: Change selection in CListCtrl with keys? [modified]

Naveen27-Jan-09 2:56

Naveen

27-Jan-09 2:56

Please handle LVN_ITEMCHANGED[^] message. When a selection change occurs in the list control, the parent dialog/window will get a LVN_ITEMCHANGED message

nave

[OpenedFileFinder] [My Blog]

bosfan27-Jan-09 3:55

27-Jan-09 3:55

Hello,
thanks for answer and i hope its ok if i answer here to naven only??

Yes this works fine, and easy to implement this funktion!
Only one funny thing is now in execution of program, this LVN_ITEMCHANGED is send 3 times?? Also my function i called 3 times??
Here my code:

// in MessageMap:
ON_NOTIFY(LVN_ITEMCHANGED, IDC_LIST, &CMyDialog::OnLvnItemchangedListAll)
// and function:
void CMyDialog::OnLvnItemchangedListAll(NMHDR *pNMHDR, LRESULT *pResult)
{
	LPNMLISTVIEW pNMLV = reinterpret_cast<lpnmlistview>(pNMHDR);
	// TODO: Add your control notification handler code here
	int iCurIndex = m_cListAll.GetSelectionMark();
	CString csItemText = m_cListAll.GetItemText(iCurIndex, 1);
	TRACE(L"%s\n", csItemText); // TRACE IS CALLED 3 TIMES :confused: so if i call here a other function they will be called 3 times??
        // like this here:
        PrintData(csItemText); // this is called 3 times too!
	*pResult = 0;
}
</lpnmlistview>

So is in output the same text 3 times listed Big Grin | :-D

, for example if i have text in my current selection: www.codeproject.com
they is dump three times Big Grin | :-D

, any idea how to avoid this(if possible Smile | :)

), or is this common property??
But this is that what i'm looking for!

Thanks for help!
termal

modified on Tuesday, January 27, 2009 10:02 AM

Nishad S27-Jan-09 4:05

Nishad S

27-Jan-09 4:05

That is because the notification is sent for different states. You can check the new and old state flags in the "LPNMLISTVIEW pNMLV". And if the new state is selected and old is not selected, then proceed it.

- ns ami -

Naveen27-Jan-09 4:07

Naveen

27-Jan-09 4:07

termal wrote:
thanks for answer and i hope its ok if i answer here to naven only??

Its ok. I will inform ns.ami cause he is my friend and we both work in same company Smile | :)

termal wrote:
Only one funny thing is now in execution of program, this LVN_ITEMCHANGED is send 3 times??

Yes this is because, the LVN_ITEMCHANGED is fired not only for selection change but also for foucs changes. So you should check, whether the current LVN_ITEMCHANGED is for selection change or not.

NM_LISTVIEW* pNMListView = reinterpret_cast<NM_LISTVIEW*>(pNMHDR);
if( LVIF_STATE == (pNMListView->uChanged&LVIF_STATE) )
{
    if( LVIS_SELECTED == (LVIS_SELECTED&pNMListView->uNewState) )
    {
        // pNMListView->iItem is now Selected
    }
    else if( LVIS_SELECTED == (LVIS_SELECTED &pNMListView->uOldState) )
    {
        // The selection of pNMListView->iItem has been removed
    }
}

nave

[OpenedFileFinder] [My Blog]

bosfan27-Jan-09 4:49

27-Jan-09 4:49

Hello,
thank you very much to you and ns.ami for help, it works now!!

with best thanks Smile | :)

termal

MSMQ - Opening a Private Queue through windows service

Nishad S27-Jan-09 18:01

Nishad S

27-Jan-09 18:01

Naveen wrote:
he is my friend and we both work in same company

Please don't tell the truth... Big Grin | :-D

- ns ami -

Md Saleem Navalur27-Jan-09 0:27

Md Saleem Navalur

27-Jan-09 0:27

I have an application, where i open the private Queue. This works fine.
But when I run this app as a windows service, it gives an error failed to open the Queue, Access is denied.

I know it has got to do something with the rights.

If the app is run as an exe, it will have the logon credentials. When run as windows service it will run with System credentials, which may not have access to Private Queue.

How do i enable my windows service to have access to the private Queue???

Any help will be great.

Thanks,
Saleem

Re: MSMQ - Opening a Private Queue through windows service

led mike27-Jan-09 4:44

led mike

27-Jan-09 4:44

Md Saleem Navalur wrote:
How do i enable my windows service to have access to the private Queue???

Did you try setting the Log On Properties for the service to use the same account as the queue?

Re: MSMQ - Opening a Private Queue through windows service

Md Saleem Navalur27-Jan-09 22:51

Md Saleem Navalur

27-Jan-09 22:51

Yes i tried that, it works.

Stack Trace [modified]

baerten27-Jan-09 0:06

baerten

27-Jan-09 0:06

Hello everybody,

is it possible to determine at realtime the function which has called the current function?

Example

void A(void)
{
  DoWork();
}

void B(void)
{
  DoWork();
}

void DoWork(void)
{
  char *trace = GetTraceOf5LastFunction();
  OutputDebugString("DoWork called from function : ");
  OutputDebugString(trace);
}

Is it possible?

Big thanks for any help Smile | :)

Edit:

I have found a fonction called "backtrace" which is placed into execinfo.h
But i don't have a such header-file on my system (Visual Studio)

modified on Tuesday, January 27, 2009 6:26 AM

Hamid_RT27-Jan-09 0:35

Hamid_RT

27-Jan-09 0:35

Can you use of dll's you can load your functions of dll on the current function.

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

baerten27-Jan-09 0:59

baerten

27-Jan-09 0:59

Is there a DLL which executes the work of backtracing?

Luc Pattyn27-Jan-09 1:53

Luc Pattyn

27-Jan-09 1:53

Hi,

the easiest way may well be the low-tech one: add a string parameter to the function, and pass the caller's name. That works no matter what.

DoWork("A");

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets

modified on Tuesday, January 27, 2009 8:10 AM

baerten27-Jan-09 3:29

baerten

27-Jan-09 3:29

This method is the simplest, but i can't write over 100 Debug-Lines into the code Smile | :)

But thanks anyway Wink | ;)

Randor 27-Jan-09 8:16

Randor

27-Jan-09 8:16

Hi baerten,

I agree with Luc. However you may be able to use a pre-defined macro[^] something like below:

VOID FunctionB(int iVal,char *caller,int line)
{
	char szBuf[MAX_PATH];
	sprintf(szBuf,"I was called by %s on line %d",caller,line);
	MessageBoxA(NULL,szBuf,0,0);
}

VOID FunctionA()
{
	FunctionB(1,__FUNCTION__,__LINE__);
}

baerten wrote:
i can't write over 100 Debug-Lines into the code

A stack trace is several times more expensive at runtime.

Best Wishes,
-David Delaune