C / C++ / MFC Discussion Boards

YaronNir10-May-06 4:32

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

Shortcuts...

Smith#10-May-06 3:13

Smith#

10-May-06 3:13

How do I programmatically create shortcuts for .exes?

NULL

Re: Shortcuts...

Hamid_RT10-May-06 3:25

Hamid_RT

10-May-06 3:25

See here[^]

How to make Win32 dll depend on mfc dll?

Kurnia Kosasi10-May-06 3:06

Kurnia Kosasi

10-May-06 3:06

We have a situation where a non mfc dll must depend on mfc dll.
When trying to compile, we got an error saying that Windows.h is already included.
When the _WINDOWS_ definition was undeffed, the compile error was gone, however it shows bunch of link errors.

Do you have any idea how to fix this? Thanks a lot!!

NonMFCDll error LNK2001: unresolved external symbol ___argc
NonMFCDll error LNK2001: unresolved external symbol ___argv
NonMFCDll error LNK2001: unresolved external symbol __mbctype
NonMFCDll error LNK2005: "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) already defined in msvcprt.lib(newop_s.obj)
NonMFCDll error LNK2005: "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) already defined in MSVCRT.lib(MSVCR71.dll)
NonMFCDll error LNK2005: "void __cdecl operator delete[](void *)" (??_V@YAXPAX@Z) already defined in MSVCRT.lib(MSVCR71.dll)
NonMFCDll error LNK2005: _DllMain@12 already defined in MSVCRT.lib(dllmain.obj)
NonMFCDll error LNK2019: unresolved external symbol __mbctype referenced in function "void __stdcall _AfxAbbreviateName(char *,int,int)" (?_AfxAbbreviateName@@YGXPADHH@Z)
NonMFCDll fatal error LNK1120: 3 unresolved externals

Kurnia

Re: How to make Win32 dll depend on mfc dll?

Andrew Hain10-May-06 3:30

Andrew Hain

10-May-06 3:30

Have you tried adding mfc71.dll (in your release build) or mfc71d.dll (in your debug build) to the Ignore Specific Library (/NODEFAULTLIB) property?

Re: How to make Win32 dll depend on mfc dll?

Andrew Hain10-May-06 3:33

Andrew Hain

10-May-06 3:33

That should be mfc71.lib and mfc71d.lib, or mfc71u.lib and mfc71ud.lib in a wide character application.

Re: How to make Win32 dll depend on mfc dll?

Kurnia Kosasi10-May-06 4:05

Kurnia Kosasi

10-May-06 4:05

Actually the NonMFCDll uses preprocessor _USRDLL. Removal of this and adding of _AFXDLL solved the problem. Thank you all.

SAFEARRAY question

scoroop10-May-06 3:01

scoroop

10-May-06 3:01

i would really appreciate some simple example of creating SAFEARRAY and inserting couple of strings (probably BSTR, i don't know for now but convertion is not a problem) into it. there's plenty about it on the internet but none of sites seem to provide just a simple exlpanation how it all works...
regards

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