C / C++ / MFC Discussion Boards

Re: A virtual function question

Stlan22-Apr-05 3:54

Stlan

22-Apr-05 3:54

What do you mean by: I can't access them ? Compilation error/warning ? Failing assertion ? Crash ?

Re: A virtual function question

bcemick22-Apr-05 4:03

bcemick

22-Apr-05 4:03

My apologies; I should have been clearer on that point.

When I click on the Print button on the property sheet, it gives me an access violation (Error code: 5) when I'm in debug mode.

Re: A virtual function question

liquid_22-Apr-05 7:24

liquid_

22-Apr-05 7:24

That's not a problem of virtual, private nor public function. Access violation means you violated the memory you accessed, i.e. address of memory wasn't valid.

Re: A virtual function question

heman15422-Apr-05 9:24

heman154

22-Apr-05 9:24

Have you placed any breakpoints to determine exactly where the access violation occurs (When you try to call the function, or inside the function...may trying to manipulate another object that isn't there anymore). How does this Print Object get instantiated?

Re: A virtual function question

Christian in a nice hotel in Singapore24-Apr-05 0:21

Christian in a nice hotel in Singapore

24-Apr-05 0:21

bcemick wrote:
Not at this time, although that is a possibility later on. For right now, though, I have to get it working this way.

It's NEVER a good idea to 'do it this way for now and change to a good design later'. I suggest you stop coding and read a book called 'Code Complete'. Seriously.

If the function is not pure virtual ( has no body for you to call anyhow ), I don't see why you can't call it.

Api that shows the status of NIC

brilliant10121-Apr-05 10:19

brilliant101

21-Apr-05 10:19

Plz tell me about an api that enlists the status of NIC?( keyboard ,Hard disk and RAM)
Wheather they are installed or not ? Plz also provide its example

Re: Api that shows the status of NIC

David Crow21-Apr-05 17:04

David Crow

21-Apr-05 17:04

Status is a vague term but perhaps the IP helper API is what you are after. See here for starters.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

List of applications runned by a user

brilliant10121-Apr-05 10:15

brilliant101

21-Apr-05 10:15

How can we get the list of applications runned by a particular user?
like MS Word, MS powerpoint, notepad used by administrator and also provide examples. Plz help me out pals

ShellNotifyRegister HELP..

RoyRose7821-Apr-05 9:27

RoyRose78

21-Apr-05 9:27

Hey all,

I'm kind of lost here, I want to listen to a file-creation event in my computer.

Not that simple I know but according to the few documents on the web I understand there is an API function (ShellNotifyRegister) that suppose to solve my problem
(you can check: http://www.geocities.com/SiliconValley/4942/notify.html to learn about it)

Anyway, I have the known error:
unresolved external symbol "void * __stdcall SHChangeNotifyRegister..."
in the linking phase..

Does anyone know how to solve it..?
Thanks.
RoyRose78

Re: ShellNotifyRegister HELP..

Michael Dunn21-Apr-05 12:01

Michael Dunn

21-Apr-05 12:01

See the FAQ
2.3 I'm trying to call a Windows API, but the linker gives an unresolved external error (LNK2001) on the API name. Why?[^]

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

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Re: ShellNotifyRegister HELP..

David Crow21-Apr-05 17:12

David Crow

21-Apr-05 17:12

You might also want to check out ReadDirectoryChangesW() and FindFirstChangeNotification().

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

crossed includes

crystalButterfly21-Apr-05 9:19

crystalButterfly

21-Apr-05 9:19

I have put this question before but it was misunderstood.

I need to declare a pointer to MFC class CMyView in CMyDialog but including myview.h in mydialog.h leads to errors (propably because mydialog.h is also included in myview.h).
Any solutions ?

Re: crossed includes

John M. Drescher21-Apr-05 9:42

John M. Drescher

21-Apr-05 9:42

Do not include myview.h in mydialog.h.
Put the following line right before your class definition for CMyDialog:

class CMyView;

And include myview.h in your cpp file after the include for mydialog.h.

John

Re: crossed includes

liquid_21-Apr-05 9:47

liquid_

21-Apr-05 9:47

Use forward declaration of a class. For example:

class CMyView;<br />
class CMyDialog<br />
{<br />
//some stuff<br />
CMyView *m_pView;<br />
//some other stuff<br />
};<br />
.<br />
.<br />
.<br />
class CMyView<br />
{<br />
//definition of the class<br />
};

That works.

Re: crossed includes

Ravi Bhavnani21-Apr-05 18:00

Ravi Bhavnani

21-Apr-05 18:00

Do you really need to declare a pointer to CMyView or will a pointer to a CView suffice? Remember, you can always cast the pointer to a CMyView* in MyDialog.cpp.

/ravi

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set size of main application window at startup

elephantstar21-Apr-05 8:10

elephantstar

21-Apr-05 8:10

Hi there,

How can I set the main applicatin window to a certain size at startup? With the code below, it sizes to the set size only when the Restore button is clicked. I'd like it to be that size when the application starts up. How can I manage this? Thanks!

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if( !CMDIFrameWnd::PreCreateWindow(cs) )
return FALSE;
cs.style =
WS_OVERLAPPED | WS_CAPTION |
WS_THICKFRAME | WS_SYSMENU |
WS_MINIMIZEBOX | WS_MAXIMIZEBOX;
cs.cx = 1000;
cs.cy = 800;
cs.x = 100;
cs.y = 100;

return CMDIFrameWnd::PreCreateWindow(cs);
}

Re: set size of main application window at startup

heman15421-Apr-05 8:19

heman154

21-Apr-05 8:19

Use the following Cwnd function,

BOOL SetWindowPos(
const CWnd* pWndInsertAfter,
int x,
int y,
int cx,
int cy,
UINT nFlags
);

Do a search on this fcn in msdn to find out more.

Re: set size of main application window at startup

elephantstar21-Apr-05 9:55

elephantstar

21-Apr-05 9:55

This function is only for child windows and popups. How can I size the main window not the child window? Thanks.

Re: set size of main application window at startup

heman15421-Apr-05 17:37

heman154

21-Apr-05 17:37

Have you tryed it? It's always worked for me. If you go on MSDN, the actual description is:

"Call this member function to change the size, position, and Z-order of child, pop-up, and top-level windows."

Also, make sure you put this in the OnCreate fcn.

Re: set size of main application window at startup

ThatsAlok21-Apr-05 18:42

ThatsAlok

21-Apr-05 18:42

You can do that by handlling [WM_GETMINMAXINFO] message too!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

UDP socket problem

Andrey Del Pozo21-Apr-05 7:33

Andrey Del Pozo

21-Apr-05 7:33

Hello everybody, I hope someone can help me with this problem, i have tried a failed miserably. Sniff | :^)

I have a client/server app, each machine will have 2 LAN adapters (one for stream data at high rates and the other for control). The underling protocol is UDP. So in order to implement a response mechanism I use the sender address returned as an output parameter from the receivefrom() function. When working with 2 different PC there is no problem (both of them with 2 lan adap), the problem appears when I tried to run the apps in my developing machine to test one of the protocols, recivefrom() returns the address of the adapter listening, not the address of the sender… WTF | :WTF:

so I can’t acknowledge the packet send.
Does anybody has experienced this kind of problem, or something related? Is there any sockopt() that I can use? OS configuration? (by the way this runs in win2k).
Thank you all.

"I don't want to achieve immortality through my work... I want to achieve it through not dying."
Woody Allen

Re: UDP socket problem

CodeBeetle23-Apr-05 1:48

CodeBeetle

23-Apr-05 1:48

if you're testing client and server apps on the same machine then you will get problems, cos u cant create 2 udp sockets on the same port.

CodeBeetle.Com

access MFC view from modeless dialog

crystalButterfly21-Apr-05 7:06

crystalButterfly

21-Apr-05 7:06

I need to access MFC view class from modeless dialog class.
Is it possible ?How

Re: access MFC view from modeless dialog

C^hris L^osinger21-Apr-05 7:39

C^hris L^osinger

21-Apr-05 7:39

the easiest way is to just give that dialog a pointer to the view you want to access.

theDialog->m_pView = pPointerToViewObject;

or, if you want the dialog to access the active view, you can use AfxGetMainWnd and CFrameWnd::GetActiveView to find it.

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Re: access MFC view from modeless dialog

Andrey Del Pozo21-Apr-05 7:44

Andrey Del Pozo

21-Apr-05 7:44

depends if you hace SDI or MDI.
if is MDI:
// this is from MSDN Library
CMDIFrameWnd *pFrame =
(CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;

// Get the active MDI child window.
CMDIChildWnd *pChild = (CMDIChildWnd *) pFrame->GetActiveFrame();

// Get the active view attached to the active MDI child
// window.
CMyView *pView = (CMyView *) pChild->GetActiveView();

if is SDI:

CFrameWnd* pMainFrm = (CFrameWnd*)AfxGetMainWnd();
CMyView *pView = (CMyView *)pMainFrm->GetActiveView();

Once you have pView you can call functions or send messages.

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