LVN_ITEMCHANGING - C / C++ / MFC Discussion Boards

Re: query on Database support

David Crow11-May-06 6:31

David Crow

11-May-06 6:31

In one of dlg1's methods:

dlg2.m_strValue = some_value_from_dlg1;
dlg2.DoModal();
...
BOOL dlg2::OnInitDialog()
{
    CDialog::OnInitDialog();
    m_combobox.AddString(m_srValue);
}

Does that make sense?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: query on Database support

swapna_signsin14-May-06 2:34

swapna_signsin

14-May-06 2:34

HI,
Thankyou,but,I didn't understand "some value from dlg1",.. is it should be one of the records we retreive or wht it could be.How will the local var of dlg1 be available in dlg2.
Will this hlp in retrieving the data "dynamically"

swapna_signsin

How to compile a dialog-resource, source files into a DLL

Jason Huang10-May-06 5:31

Jason Huang

10-May-06 5:31

How to compile a dialog-resource, header file, and source file into a DLL file.
I want make a dll including a dialog-resource, header file, and source file,
I want to reuse it in another project.
Is any one can help me?

I develop in VC6++.

Re: How to compile a dialog-resource, source files into a DLL

C^hris L^osinger10-May-06 6:16

C^hris L^osinger

10-May-06 6:16

create a new DLL project that supports MFC. then add your files and resources

Cleek | Image Toolkits | Thumbnail maker

OnDraw Vs OnPaint in CView

cpp_prgmer10-May-06 4:37

cpp_prgmer

10-May-06 4:37

Hi
Could some one pls explain the difference between OnDraw and OnPaint in CView?
I have a MDI application and I find that OnPaint is getting called on window resize but OnDraw is not getting called. However, for a SDI application I find that OnDraw is being called on window resize.

Is it something related to SDI, MDI? What is the basic difference between both these functions??

Re: OnDraw Vs OnPaint in CView

Michael Dunn10-May-06 10:02

Michael Dunn

10-May-06 10:02

OnPaint() is the handler for WM_PAINT. OnDraw() is an MFC-specific function. The framework calls OnDraw() for both drawing on the screen and printing, that way the same drawing code can be used for both situations.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: OnDraw Vs OnPaint in CView

cpp_prgmer21-May-06 20:28

cpp_prgmer

21-May-06 20:28

thanks for the info.. I have this mdi appln wherein the OnDraw handler was not being called till the point I had removed the handler for the OnPaint message.

What is the connection between both, are they supposed to be mutually exclusive? I guess all that should happen is the both thye handlers shall be called twice but it does not happen that way. Why is it so?

LVN_ITEMCHANGING

YaronNir10-May-06 4:32

YaronNir

10-May-06 4:32

Hi All,

I have a window that on the left side it has a list control, and selecting an item in that list , switch between child dialogs (same as in all property pages).

my problem is that before i jump into the new page i validate the current page and if it is not invalid i show a message. here i want to prevent the list from jumping to the new selected item.

here is the code i use:

BEGIN_MESSAGE_MAP(...)
ON_NOTIFY(LVN_ITEMCHANGED, IDC_LIST,OnListItemChanged)
ON_NOTIFY(LVN_ITEMCHANGING,IDC_LIST,OnListItemChanging)
END_MESSAGE_MAP(...)

void CMyWnd::OnListItemChanged(NMHDR* pNMHDR, LRESULT* pResult)
{
NMLISTVIEW *pState = (NMLISTVIEW *)pNMHDR;

//... do whatever

*pResult = 0;
}

void CMyWnd::OnListItemChanging(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_LISTVIEW* pState = (NM_LISTVIEW*)pNMHDR;

if (pState->iItem == m_iCurrentItem)
{
if (!ValidatePage(...)
{
*pResult = TRUE;
return;
}
}

*pResult = FALSE;
}

the problem is that the OnTopicListItemChanging is being called twice so i get twice a message box.....i tried to prevent that using a static bool variable, but didn't do me good...

any suggestions?

thanks in advanced
Yaron

Interface basics click here :
http://www.codeproject.com/com/COMBasics.asp

don't forget to vote Smile | :)

-- modified at 10:33 Wednesday 10th May, 2006

Re: LVN_ITEMCHANGING

David Crow10-May-06 6:17

David Crow

10-May-06 6:17

YaronNir wrote:
the problem is that the OnTopicListItemChanging is being called twice...

You get a notification for the item that is no longer selected, and another for the item that is being selected. You should be able to look at NMLISTVIEW's uNewState and uOldState member variables.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: LVN_ITEMCHANGING

YaronNir10-May-06 10:00

YaronNir

10-May-06 10:00

problems...

look at the following code:

void CMyWnd::OnListItemChanging(NMHDR* pNMHDR, LRESULT* pResult)
{
	NMLISTVIEW *pState = (NMLISTVIEW *)pNMHDR;

	if (0 == pState->uNewState && 2 == pState->uOldState)
	{
	   if (!m_pDlg->ValidatePage())
	   {
	 	AfxMessageBox(_T("aa"));
		*pResult = TRUE;
	   }
	   else
	   {
	 	*pResult = FALSE;
	   }
	}
}

First time i step into the function, the uNewState is 0 and uOldState is 2 therefor validation is being checked and a message box pops. the function then returns TRUE which means it doesn't allow the new selection to be made.

but i see i step into this function again, with the same parameter values (for uNewState and uOldState) so once again i see the message box for validation

how can i solve this?

thanks
Yaron

Interface basics click here :
http://www.codeproject.com/com/COMBasics.asp

don't forget to vote Smile | :)

srvany Problems

steff.k@gmx.net10-May-06 4:16

steff.k@gmx.net

10-May-06 4:16

The msdn says the following:

Programming Considerations
For WIN32 graphical applications: when the currently logged-in user is logging-off, all WIN32 top-level windows receive WM_QUERYENDSESSION and WM_ENDSESSION messages. Some WIN32 applications choose to terminate upon receipt of such messages. In order for your WIN32 application to survive logoff, it must not do that: instead, your windows procedure should call the default windows procedure on these messages.

But I have no idea how to develop this?

Can anybady give me an advice or example, how to make my srvany-service "logoff-save"?

Thank you!

Re: srvany Problems

David Crow10-May-06 6:13

David Crow

10-May-06 6:13

steff.k@gmx.net wrote:
Can anybady give me an advice or example, how to make my srvany-service "logoff-save"?

Just return 0 when you receive the WM_QUERYENDSESSION message.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: srvany Problems

steff.k@gmx.net10-May-06 21:03

steff.k@gmx.net

10-May-06 21:03

Thanks you!

how to stop the action of one button by pushing another button

joy2110-May-06 3:55

joy21

10-May-06 3:55

hi experts
i have a dialog-based application in which i had placed two buttons.when the first button is pushed it wil start generating some strings.so when i pushed the next button it should stop generating strings.itried it with some bool variables .but control is not received to stop button.how can i do that?

joy

Re: how to stop the action of one button by pushing another button

Cedric Moonen10-May-06 4:01

Cedric Moonen

10-May-06 4:01

When you start you first button, how the data is generated ? In a loop ?
If yes, start a new thread to process the data and like that, it won't freeze the GUI. Then, you can simply have a boolean set to true/false to continue the loop or not.

Re: how to stop the action of one button by pushing another button

joy2110-May-06 4:31

joy21

10-May-06 4:31

hi sorry to disturb you.can you please tell me how can i start a thread?
thanking you

joy

Re: how to stop the action of one button by pushing another button

Cedric Moonen10-May-06 4:36

Cedric Moonen

10-May-06 4:36

You can use the CreateThread[^] function for that. Anyhow, I think you need to read a little bit how to work with threads. Make a search in the articles of this website, perhaps you'll find something usefull. Also, google can help Wink | ;)

It is a little bit long to explain how it works in a post.

Re: how to stop the action of one button by pushing another button

C^hris L^osinger10-May-06 4:02

C^hris L^osinger

10-May-06 4:02

either use a separate thread for the 'generate some strings' part, or use the old-fashioned "message pump" function inside your string generating code.

Cleek | Image Toolkits | Thumbnail maker

Msgsrv.exe

Aryan S10-May-06 3:18

Aryan S

10-May-06 3:18

What is msgsrv.exe? What is it responsible for?

Re: Msgsrv.exe

David Crow10-May-06 3:49

David Crow

10-May-06 3:49

Aryan S wrote:
What is msgsrv.exe?

Windows' 32-bit message server.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: Msgsrv.exe

Steffen Lange10-May-06 5:46

Steffen Lange

10-May-06 5:46

MS has a kb article about it: http://support.microsoft.com/kb/q138708/

Metafile

submit-CD10-May-06 3:15

submit-CD

10-May-06 3:15

Hi,

I'd like to know how it's possible de edit a EMF with visualC++

I want to be able to import an EMF image and explode it, to be able to eddit the text in the image

thanks

Re: Metafile

C^hris L^osinger10-May-06 3:52

C^hris L^osinger

10-May-06 3:52

there is nothing built into VC that will allow you to do this - no tools, no editor, etc..

Cleek | Image Toolkits | Thumbnail maker

Re: Metafile

submit-CD10-May-06 4:23

submit-CD

10-May-06 4:23

Thanks Chris

What about the function :EnumEnhMetaFile , I just read that I can use it to edit a EMF, but there is to example about

Thanks

Re: Metafile

C^hris L^osinger10-May-06 4:47

C^hris L^osinger

10-May-06 4:47

sorry, don't have examples for that. Google groups probably does, though.

Cleek | Image Toolkits | Thumbnail maker

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.