Re: Last Thread post for me... - C / C++ / MFC Discussion Boards

john john mackey15-Oct-02 7:14

15-Oct-02 7:14

Hi all.

I want to have a CComboBox control that accepts a user's new entry (like a CEdit control) and then adds this entry to the CComboBox.

Here is an example:

Current entries: Cat, Dog, Canary

User types: d-o-l-p-h-i-n (the word dolphin)

Since not in the list, I want my code to add it.

I saw the examples for the IAutoComplete, but I'm not really concerned with that - I just want something simple and that/those examples seem too complex (maybe not? Confused | :confused:

)

Can anyone help me with adding entries to a CComboBox WHILE IN THE CComboBox control?

Thanks so much.
Johnny

Re: CComboBox acts like CEdit

Tomasz Sowinski15-Oct-02 7:23

Tomasz Sowinski

15-Oct-02 7:23

No big magic here - just use CComboBox::FindStringExact to check if user has typed new or existing string, and CComboBox::AddString or CComboBox::InsertString to actually add new entry to dropdown part of the combo.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

handlin WM_KILLFOCUS in CWnd-derived

mishgun15-Oct-02 6:23

mishgun

15-Oct-02 6:23

hi!

i've encountered serious problem, which couldnt solve for hours.

i've got a couple of views splitted by CSplitterWnd
in one of this views (ParentView) i dynamically create CWnd-derived object (SpinEdit) that holds CEdit and CSpinButtonCtrl (analogously to CInPlaceEdit by Chris Maunder).

the problem is:
i cant handle WM_KILLFOCUS message in SpinEdit window. Spy++ shows that this message isnt sent to SpinEdit window than user clicks mouse button on ParentView.

maybe problem is in ParentView? it is completely owner drawn and has no more child-controls except this dynamically created SpinEdit.

any help will be greatly appreciated

nobody is perfect

Re: handlin WM_KILLFOCUS in CWnd-derived

Roger Allen16-Oct-02 2:07

Roger Allen

16-Oct-02 2:07

This may be of help http://www.codeproject.com/dialog/killfocus.asp[^]

Roger Allen
Sonork 100.10016

I think I need a new quote, I am on the prowl, so look out for a soft cute furry looking animal, which is really a Hippo in disguise. Its probably me.

Last Thread post for me...

15-Oct-02 6:14

Hello,
I have learned a ton in the past few days.. Having never programmed UI Threads (with the help of articles on Code Project and all of you) I have implemented a UI thread that contains a CSocket for file transfer.. The server works perfect except when I close the server I have a memory leak.. This is how I start the UI Thread and how I close the UI thread.. what am I doing wrong??

Here is the creation inside CMainFrame

////////////////////////////////////////////////////////////////////////
// Create the UI Thread for file transfer
CFtThread* pThread = (CFtThread*)AfxBeginThread(RUNTIME_CLASS(CFtThread),
THREAD_PRIORITY_NORMAL,0,CREATE_SUSPENDED);
					
	pThread->m_nPort = 21;
	pThread->ResumeThread();
	pThread->OnStartListening();
// End of Thread
////////////////////////////////////////////////////////////////////////

Here is how I am trying to close the thread.. it's in CMainFrame::OnClose()

void CMainFrame::OnClose() 
{
..... code
CFtThread* pThread = (CFtThread*)AfxGetThread();
pThread->ExitInstance();
..... code

CFrameWnd::OnClose();
}

In my int CFtThread::ExitInstance() I try to close the socket and remove any connected sockets...

int CFtThread::ExitInstance()
{
	m_sSocket.ShutDown(2);
	m_sSocket.Close();
	
	POSITION pos, temp;
	pos = m_pEpList.GetHeadPosition(); // m_pEpList is a CPtrList

	while(!m_pEpList.IsEmpty())
	{
		temp = pos;
		CFtSocket* pSocket = (CFtSocket*)m_pEpList.GetNext(pos);
		pSocket->Close();	
		m_pEpList.RemoveAt(temp);
	}

	return CWinThread::ExitInstance();
}

Any ideas on why I still have a memory leak?

Thanks,
Rob Jones

Re: Last Thread post for me...

jmkhael15-Oct-02 6:32

jmkhael

15-Oct-02 6:32

u are emtying the list, but are u deleting the pointers if any??

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Last Thread post for me...

Anonymous15-Oct-02 6:56

Anonymous

15-Oct-02 6:56

Yes I delete all Socket pointers.. It's in a different function.. 99% of the time the pointers are gone and the pointer list is empty.. I just empty it on close "just incase"..

Re: Last Thread post for me...

Jon Hulatt15-Oct-02 6:42

Jon Hulatt

15-Oct-02 6:42

AfxGetThread() returns a CWinThread pointer to the thread that makes the call. From your chunks of code it looks like you are trying to close your main thread from the OnClose() event handler for it, and thus not actually closing your CFtThread object.

I don't know what would happen if you cast a CWinThread pointer to CFtThread; I would have thought something more significant than a memory leak would happen when you try to call members of CFtThread.m_sSocket.

You get given a pointer to your CFtThread as a return from AfxBeginThread(). Try using that to close the thread.

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Re: Last Thread post for me...

Anonymous15-Oct-02 7:02

Anonymous

15-Oct-02 7:02

I set a member pointer to CFtThread (in CMainFrame) and tried to use that pointer (from AfxBeginThread()) to close the thread.. seems that maybe the app closes before the thread does.. is there a way to wait for the thread to close before closing the app?

Re: Last Thread post for me...

Jon Hulatt15-Oct-02 21:24

Jon Hulatt

15-Oct-02 21:24

Thats cool. Just these two lines in your sample code made me suspicious:-

CFtThread* pThread = (CFtThread*)AfxGetThread();
pThread->ExitInstance();

Anyway. Only your CFtThread thread can terminate itself safely. You need to devise a mechanism for signaling to it that it needs to terminate. For a suitable signalling mechanism, see CWinThread::PostThreadMessage. You could use a custom message for it.

When your thread receives the message, it should call AfxEndThread().

for detailed info, see msdn "multithread programming | with mfc"

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Here's the memory dump, if it helps..

Anonymous15-Oct-02 7:29

Anonymous

15-Oct-02 7:29

Dumping objects ->
strcore.cpp(118) : {93} normal block at 0x01222E40, 52 bytes long.
Data: < ' ' C:\C> 01 00 00 00 27 00 00 00 27 00 00 00 43 3A 5C 43
C:\Code\FtServer\FtThread.cpp(17) : {91} client block at 0x01222F40, subtype 0, 168 bytes long.
a CFtThread object at $01222F40, 168 bytes long
Object dump complete.

I'm unsure what strcore.ccp is... not sure if this helps.

Any ideas?

Re: Here's the memory dump, if it helps..

Jon Hulatt15-Oct-02 21:16

Jon Hulatt

15-Oct-02 21:16

strcore.cpp needn't concern you:- MFC internals. The useful part of that dump is the line:-

a CFtThread object at $01222F40, 168 bytes long

tells you what it was.

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Re: Here's the memory dump, if it helps..

jhwurmbach15-Oct-02 22:30

jhwurmbach

15-Oct-02 22:30

strcore.cpp is the guts of CString.
As you can see, the leaked memory even contains fragments of your string.
But this is not CStrings fault, it simply gets no opportunity to clean up.

Re: Last Thread post for me...

KaЯl16-Oct-02 0:23

KaЯl

16-Oct-02 0:23

The best way to kill a thread is asking it to finish and wait for its end. A way to to this could be to implement a specific message send by the app to the thread.
(m_pMyThread is the pointer you get from AfxBeginThread
WM_STOPTHREAD defined as WM_APP + 1)

In the application:

<code>
// asking the thread to end
m_pMyThread->PostThreadMessage(WM_STOPTHREAD, 0, 0);
MsgWaitForMultipleObjects(1, &(m_pMyThread->m_hThread), TRUE, INFINITE, QS_ALLEVENTS);</code>

In the thread

<code>BEGIN_MESSAGE_MAP(CMyThread, CWinThread)
ON_THREAD_MESSAGE(WM_STOPTHREAD, OnStopThread)
END_MESSAGE_MAP()</code>

<code>LRESULT CMyThread::OnStopThreadClip(WPARAM wParam, LPARAM lParam)
{
// cleaning data here

AfxEndThread(1);

return 0L;
}</code>

HTH,

K.

<font size=0>
Some of those that work forces
Are the same that burn crosses !

Killing In The Name/Rage Against The Machine
</a>
</font>

Print preview and OnClose

-Dy15-Oct-02 4:45

-Dy

15-Oct-02 4:45

How can I find out if I'm in print preview mode in my main frames OnClose()?

I've tried checking the DC IsKindOf for CPreviewDC, but couldn't get a positive result (am I using the DC incorrectly?) like this:

CDC* pDC = GetDC();
if (pDC && pDC->IsKindOf(RUNTIME_CLASS(CPreviewDC)))
	// in print preview mode...
if (pDC)
	ReleaseDC(pDC);

And I've also tried checking for difference's in the hDC's without joy:

CDC* pDC = GetDC();
if (pDC && pDC->m_hDC != pDC->m_hAttribDC)
	// in print preview mode...
if (pDC)
	ReleaseDC(pDC);

Anyone know how I can find out if I'm in print preview in my CMainFrame::OnClose() ??

Dylan Kenneally
London, UK

Re: Print preview and OnClose

Tomasz Sowinski15-Oct-02 4:58

Tomasz Sowinski

15-Oct-02 4:58

From the top of my head: override CFrameWnd::OnSetPreviewMode. Never did that, however Smile | :)

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

Re: Print preview and OnClose

-Dy15-Oct-02 5:31

-Dy

15-Oct-02 5:31

Works a treat, thanks very much

Dylan Kenneally
London, UK

SCroll bar size

suresh_sathya15-Oct-02 3:30

suresh_sathya

15-Oct-02 3:30

I am doing my win32 application.How to dynamically increase scroll bar size
of a window.

Re: SCroll bar size

Tomasz Sowinski15-Oct-02 3:41

Tomasz Sowinski

15-Oct-02 3:41

Do you create your scrollbars by adding WS_HSCROLL or WS_VSCROLL window style, or it's a child control?

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

Use CRecordSet with Access

MyEden15-Oct-02 2:58

MyEden

15-Oct-02 2:58

Hi,
I have 2 Tables on MS-Access and I use 1 class CRecordSet because these tables are joined. I have no problem to read a recordset like this:

rsMsg.m_strFilter.Format("CLE = %d", lCle );
rsMsgExp.Open( CRecordset::snapshot,_T("Proc"));
if(!(rsMsgExp.IsEOF() && rsMsgExp.IsBOF()))
{
rsMsgExp.MoveFirst();
csToto = rsMsgExp.m_TOTO;

But when I don't want to write (Add or Update a record), it's not possible, the Exception is "Record is on Read Only Mode", why ???????
Thanks a lot .... Confused | :confused:

Re: Use CRecordSet with Access

Tomasz Sowinski15-Oct-02 3:14

Tomasz Sowinski

15-Oct-02 3:14

Snapshots are not updateable. BTW: why don't you use CDaoRecordset instead of ODBC-based CRecordset if you're using Access?

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

Re: Use CRecordSet with Access

MyEden15-Oct-02 3:14

MyEden

15-Oct-02 3:14

Yes I use MS-Access

Re: Use CRecordSet with Access

Tomasz Sowinski15-Oct-02 3:20

Tomasz Sowinski

15-Oct-02 3:20

So use CDaoRecordset and open it as 'dynaset', not 'snapshot' - pass dbOpenDynaset to CDaoRecordset::Open.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

Need Help: MFC Date and Time

leonwoo15-Oct-02 1:45

leonwoo

15-Oct-02 1:45

Hi,
I have a problem with the COleDateTime class. I have no idea how to do subtraction and addition for two COleDateTime objects. I am used to the VB type of time and date addition and subtraction. Is there a way to do subtraction and addition as in VB date/time?
By the way is there an equalvalent date/time method in VC that is similar to the one in VB?

Your help is greatly appreciated. Confused | :confused:

leonwoo

Re: Need Help: MFC Date and Time

Tomasz Sowinski15-Oct-02 1:54

Tomasz Sowinski

15-Oct-02 1:54

Look at the COleDateTimeSpan class and operators +,-,+= and -= defined in COleDateTime.

Tomasz Sowinski -- http://www.shooltz.com

*** Si fractum non sit, noli id reficere. ***

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