C / C++ / MFC Discussion Boards

dazinith20-Aug-02 9:47

20-Aug-02 9:47

I have a CTreeCtrl who has a message handler for TVN_SELCHANGED

ON_NOTIFY(TVN_SELCHANGED, IDC_MYTREE, OnTvnSelchangedMyTree)

this function looks like this:

void CMyApp::OnTvnSelchangedMyTree(NMHDR *pNMHDR, LRESULT *pResult)
{
	TRACE("CMyApp::OnTvnSelchangedMyTree()\n");
	LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);
	UpdateStatusPane();
	*pResult = 0;
}

my problem is that when I populate the list it calls this OnTvnSelchangedMyTree() after every item that is added to the list.. my UpdateStatusPane() is a little lengthy, so it makes the populating of my tree slow..

is there any way to add items to a tree without sending a selection changed message after each one added? anyone have any other suggestions?

thanks in advance!

-dz

Re: CTreeCtrl and Selection Changed Event

Ernest Laurentin20-Aug-02 11:08

Ernest Laurentin

20-Aug-02 11:08

Did you try to remove TVS_SHOWSELALWAYS style with ModifyStyle(...)?
I was not sure what you were doing inside of UpdateStatusPane(), are you changing the tree selection again? If so, then you shouldn't!

VOTD: 23 "And this is his command: to believe in the name of his Son,
Jesus Christ, and to love one another as he commanded us." - 1 John 3:23 (NIV)

Re: CTreeCtrl and Selection Changed Event

dazinith20-Aug-02 11:19

dazinith

20-Aug-02 11:19

i turned the always show selection off and it still calls the selection changed event handler.. ah well..

i fixed it by adding this:

if (pNMTreeView->action != TVC_UNKNOWN) // dont update the button states just from populating, only do when selected by mouse or keyboard
    UpdateStatusPane();

my UpdateStatusPane() is just populating a side view with a bunch of info about whats selected.. the if statement i added makes it where it wont call the function unless the user selects the item with the keyboard or mouse, not if it is told the selection changed by another function.

-dz

Re: CTreeCtrl and Selection Changed Event

Joel Lucsy21-Aug-02 12:38

Joel Lucsy

21-Aug-02 12:38

I'm not sure if this will help but try calling SetRedraw( FALSE ) before any updates and SetRedraw( TRUE ) when you're done.

Joel Lucsy (jjlucsy@ameritech.net)

Re: CTreeCtrl and Selection Changed Event

dazinith22-Aug-02 3:43

dazinith

22-Aug-02 3:43

wow, that got rid of all of my flickering! thanks a ton!

-dz

Hyperlink Question

Onyme20-Aug-02 9:13

Onyme

20-Aug-02 9:13

I would like to know how to add a hyperlink to a Dialod window.

Thanks

Re: Hyperlink Question

dazinith20-Aug-02 9:36

dazinith

20-Aug-02 9:36

void CDZApp::OnLinkButtonClicked()
{ ShellExecute(NULL, _T("open"), "http://www.dzgraphics.com/", NULL,NULL, SW_SHOW); }

that would be the code for a button.. i havent used any hyperlink controls that underline, or make the link blue or anything.. try searching here on CP..

-dz

Re: Hyperlink Question

jmkhael20-Aug-02 9:45

jmkhael

20-Aug-02 9:45

http://www.codeproject.com/miscctrl/hyperlink.asp

ur welcome!

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Hyperlink Question

Anonymous20-Aug-02 9:49

Anonymous

20-Aug-02 9:49

Thanks!

Why was WinCE implementation better than Win32?

djrisc20-Aug-02 8:50

djrisc

20-Aug-02 8:50

Recently in my dealings with Winsock, I have noticed that Windows CE implementation of Winsock seems to be more robust than the Win32 version.

Window CE supports SSL version 2 and 3 simply by calling a couple of additional functions.

Why does the Win32 version of Winsock not support this feature, and is there something similar I am missing on the straight Win32 platform?

This seems incredibly silly that MS would implement such a great feature on JUST the CE platform? Frown | :(

. djrisc .

Remove taskbar icon to CWnd derived wnd

BlackSmith20-Aug-02 8:39

BlackSmith

20-Aug-02 8:39

I inherited from CWnd and I want that my wnd wont have a taskbar icon.
It's created by CreateEx(), Style - WS_POPUP.
I know bout' the article discussing removing TB-icon in CDialog base appz.
This does'nt work in my case;

HEEEELLLLPPPP!!!!!

--BlackSmith--

"With the help of all mighty", 2001, Me.

Modal MessgeBox Problem

moobob20-Aug-02 7:45

moobob

20-Aug-02 7:45

I have a problem with my app when displaying a MessageBox to indicate an error. I display the message box in a losingFocus callback, if the value of a dialog field is out of range. Most times the message box behaves correctly. The problem occurs when the user clicks in a window outside the application, the message box gets displayed and keeps reappearing when the OK button is pressed. This will continue for 10-20 times before the dialog will stop appearing. I have tried all three of the modality values (MB_APPLMODAL, MB_SYSTEMMODAL, MB_TASKMODAL) with the same results.

Any suggestions as to how I can make the messagebox behave properly when the user clicks outside my application?

Thanks in advance,
Bob

Re: Modal MessgeBox Problem

Mustafa Demirhan20-Aug-02 9:08

Mustafa Demirhan

20-Aug-02 9:08

Could you post that part of the code please?

Mustafa Demirhan
http://www.macroangel.com
Sonork ID 100.9935:zoltrix

<nobr>They say I'm lazy but it takes all my time

Re: Modal MessgeBox Problem

moobob20-Aug-02 9:20

moobob

20-Aug-02 9:20

I think I need to determine if the focus is going to a window outside my app. How do I do that?

Here is the code.

void DataImportDlg2::OnKillfocusProtocolNameCb() 
{
    CString protoName;

    // Get the protocol item just typed in.
    m_protocolNameCB.GetWindowText(protoName);

    // If an item was typed in
    // verify this protocol exists.
    if (protoName.GetLength() > 0)
    {
        int index = m_protocolNameCB.FindStringExact(0, protoName);

        if (index == CB_ERR)
        {
            MessageBox (_T ("Protocol does not exist, to create it, use the Create Protocol button"),
                        _T ("Data Import"), 
                        MB_ICONERROR | MB_OK | MB_APPLMODAL | MB_TOPMOST);

            m_protocolNameCB.SetFocus();
        }

Thanks,
Bob

Re: Modal MessgeBox Problem

moobob20-Aug-02 9:31

moobob

20-Aug-02 9:31

I am trying to determine if the control that focus is going to next is on my app's window. Here is how I am attempting to do this

void DataImportDlg2::OnKillfocusProtocolNameCb(CWnd* pNewWnd ) 
{
	CString protoName;

//	CWnd *pMainWnd = (CWnd *) AfxGetApp()->m_pMainWnd;
	CWnd *pMainWnd = (CWnd *) AfxGetMainWnd();

	BOOL child = pMainWnd->IsChild(pNewWnd);

When I click on a control on my apps window, the IsChild returns FALSE. I would expect it to return TRUE.

What am I doing wrong?

Thanks in advance,
Bob

Re: Modal MessgeBox Problem

Mustafa Demirhan20-Aug-02 10:07

Mustafa Demirhan

20-Aug-02 10:07

Well, this won't work because the control is the child of your View class; not the CMainFrame class.

I have two suggestions: The first one is the easier way: Don't try to validate the data everytime you loose focus. Instead, validate it when the user clicks on OK button.

If you want to do it whenever the window looses focus do it this way: Create a bool variable as a member of your view. Lets say m_bChildHasFocus

Now, whenever the control gets the focus set the variable to true and whenever it looses set it false. Here is the code:

void DataImportDlg2::OnKillfocusProtocolNameCb() 
{
	if (!m_bChildHasFocus)
		return CView::OnKillFocus(); // or whatever! I am not sure. Just exit the function properly!!

	m_bChildHasFocus = false;

	CString protoName;

	// Get the protocol item just typed in.
	m_protocolNameCB.GetWindowText(protoName);

	// If an item was typed in
	// verify this protocol exists.
	if (protoName.GetLength() > 0)
	{
		int index = m_protocolNameCB.FindStringExact(0, protoName);

		if (index == CB_ERR)
		{
			MessageBox (_T ("Protocol does not exist, to create it, use the Create Protocol button"),
			_T ("Data Import"), 
			MB_ICONERROR | MB_OK | MB_APPLMODAL | MB_TOPMOST);
			m_protocolNameCB.SetFocus();
			m_bChildHasFocus = true;
		}

Also, don't forget to add the OnGetFocus function. In OnGetFocus functions, just set m_bChildHasFocus = true.

Mustafa Demirhan
http://www.macroangel.com
Sonork ID 100.9935:zoltrix

<nobr>They say I'm lazy but it takes all my time

CEdit::ReplaceSel Help Needed

Cerb20-Aug-02 7:10

Cerb

20-Aug-02 7:10

Hi
I would need your help, I need to add text in my multiline EditBox when a user clicks on the appropriate link on the menu.

I use a Dialog-based Application.

Thanks for helping me! Smile | :)

Re: CEdit::ReplaceSel Help Needed

Ravi Bhavnani20-Aug-02 7:35

Ravi Bhavnani

20-Aug-02 7:35

CEdit* pEdit = (CEdit *) GetDlgItem (IDC_MyEdit);
ASSERT (pEdit != NULL);
CString strText;
pEdit->GetWindowText (strText);
strText += "Added text";
pEdit->SetWindowText (strText);

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: CEdit::ReplaceSel Help Needed

Stephane Rodriguez.20-Aug-02 7:37

Stephane Rodriguez.

20-Aug-02 7:37

CString szContent = "...";

myeditbox.SetSel(0,-1); // Ctrl-A
myeditbox.ReplaceSel( szContent.GetBuffer(0) ); // Paste

And I swallow a small raisin.

Re: CEdit::ReplaceSel Help Needed

Cerb20-Aug-02 7:45

Cerb

20-Aug-02 7:45

Sorry but I'm working on a HTML Editor and your both methods works, but not for the type of project I'm working on.

I want to add text at my cursor's position in my edit box, and someone told me I had to use ReplaceSel.

Anyways, please tell me what I have to do.

Thanks a lot! Smile | :)

Socket recv question

Todd Smith20-Aug-02 6:51

Todd Smith

20-Aug-02 6:51

This is what MSDN says on recv

If the socket is connection oriented and the remote side has shut down the connection gracefully, and all data has been received, a recv will complete immediately with zero bytes received. If the connection has been reset, a recv will fail with the error WSAECONNRESET.

and then

If no error occurs, recv returns the number of bytes received. If the connection has been gracefully closed, the return value is zero. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

The first paragraphs says if all data has been received. Is there ever a case where recv returns 0 for a few cycles but then continues receiving data or does 0 mean dead?

Todd Smith

Re: Socket recv question

Le centriste20-Aug-02 7:10

Le centriste

20-Aug-02 7:10

If recv returns 0, it means that the peer has close the connection on its side. In fact, recv will block if the connection is still open but there is no data to be read. All data has been received means that previous call(s) to recv returned data and there is no more to be read and the connection is closed by the peer.

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Re: Socket recv question

Len Holgate20-Aug-02 7:09

Len Holgate

20-Aug-02 7:09

If you're using blocking sockets then recv will block if there's no data to return.

If you're using non-blocking sockets then recv will return SOCKET_ERROR and WSAGetLastError will return WSAEWOULDBLOCK.

If the call to recv returns 0 then it means that the connection has been shutdown cleanly and there's no more data to come through.

Len Holgate
www.jetbyte.com
The right code, right now.

Directshow

Zizilamoroso20-Aug-02 6:45

Zizilamoroso

20-Aug-02 6:45

Does anyone know the basics for merging 2 mediafiles together, one after eachother, using direct show?

I can copy a sourcefile to a destfile, mix 2 sourcefiles OVER eachother, but I can not merge them one AFTER another.

I'm using DShow 8.1

Which filter should I use?

[VISUAL STUDIO 6.0] [MFC] [WIN98/2]

Bluute tette! Dead | X|

Re: Directshow

Stephane Rodriguez.20-Aug-02 7:33

Stephane Rodriguez.

20-Aug-02 7:33

the vidclip sample from the DirectX SDK should be used as the starting point. it translates any format to any format, and that should be easy to do an append instead,

And I swallow a small raisin.

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