C / C++ / MFC Discussion Boards

Sujan Dhakal2-Feb-10 16:27

2-Feb-10 16:27

thanks for the answer but i dont want to use ofstream and ifstream class instead i want to use fstream class only. Is it possible? and i also need the file to be created as using ofstream.

Re: ios::in | ios::out error

CPallini2-Feb-10 21:16

CPallini

2-Feb-10 21:16

if the file does not exist, you have to use

fstream file("c:\\test.txt",  ios::out | ios::binary);

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Re: ios::in | ios::out error

Sujan Dhakal3-Feb-10 0:55

Sujan Dhakal

3-Feb-10 0:55

what's problem with this bit masking
ios::in | ios::out | ios::binary
since we have specified out in the mask, why the file is not being created.

thanks for replying.

Re: ios::in | ios::out error

CPallini3-Feb-10 1:30

CPallini

3-Feb-10 1:30

The problem is you can't read from a not exitsting file, I suppose.
Your bit mask works if the file do exist. On the other hand, if the file does not exist you should use the

ios::out | ios::binary

mask.

Re: ios::in | ios::out error

xiaozhu87662-Feb-10 17:07

xiaozhu8766

2-Feb-10 17:07

maybe your file doesn't exist.check your file. I check your code, is ok.

Calvin

CDialog ON_WM_KEYDOWN event

chevu2-Feb-10 0:20

chevu

2-Feb-10 0:20

Hi,
I am using ON_WM_KEYDOWN event for keyboard shortcuts in my application. And below is function to handle this keydown action.

void CRearPanel::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	if(nChar == 112)
	{
		if(((CMainFrame*)AfxGetMainWnd())->GetRearPanel()->m_hWnd != NULL)
			((CMainFrame*)AfxGetMainWnd())->GetRearPanel()->ShowWindow(SW_HIDE);
		if(((CMainFrame*)AfxGetMainWnd())->GetHWSimulatorDlg()->m_hWnd != NULL)
			((CMainFrame*)AfxGetMainWnd())->GetHWSimulatorDlg()->ShowWindow(SW_HIDE);
	}
	else if(nChar == 113)
	{
		((CMainFrame*)AfxGetMainWnd())->OnViewHWSimulator();		

		if(((CMainFrame*)AfxGetMainWnd())->GetRearPanel()->m_hWnd != NULL)
			((CMainFrame*)AfxGetMainWnd())->GetRearPanel()->ShowWindow(SW_HIDE);
	}
	else if(nChar == 114)
	{
		((CMainFrame*)AfxGetMainWnd())->OnViewRearpanel();
		::SetFocus(((CMainFrame*)AfxGetMainWnd())->GetRearPanel()->m_hWnd);

		if(((CMainFrame*)AfxGetMainWnd())->GetHWSimulatorDlg()->m_hWnd != NULL)
			((CMainFrame*)AfxGetMainWnd())->GetHWSimulatorDlg()->ShowWindow(SW_HIDE);
	}

	CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}

Now let me explain my problem,

Here I am having one main document window which is coming up initially. And I have another 2 dialog window which should be open on keydown event. From main document window I am able to get key down event and functionality working properly. In Those 2 dialog I put same events, and there start my problem. First time when it(dialog) comes up its not catching keydown event. If I close that dialog and then open it again then I am able to catch it. I found on net some where to put below code,

BOOL CRearPanel::PreTranslateMessage(MSG* pMsg) 
{	
	if( pMsg->message == WM_KEYDOWN )	
	{			
		::TranslateMessage(pMsg);
		::DispatchMessage(pMsg);
		return (1);
	}	
	return CDialog::PreTranslateMessage(pMsg);
}

But I dint find it helpful. Can any one help me for this issue.

Re: CDialog ON_WM_KEYDOWN event

Nelek2-Feb-10 5:54

Nelek

2-Feb-10 5:54

Do you want the dialogs to execute anything when key down?
or..
Is the parent window the one that has to execute anything on the key down from dialog?

Regards.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
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Re: CDialog ON_WM_KEYDOWN event [modified]

chevu2-Feb-10 15:02

chevu

2-Feb-10 15:02

well currently I have set same shortcut action in main window and 2 dialog. I mean for all window action for F1 F2 F3 should be same. I thought of passing action msg to main window back, but for that also those dialog should get event..
Is there any work around?

modified on Tuesday, February 2, 2010 10:33 PM

Re: CDialog ON_WM_KEYDOWN event

chevu2-Feb-10 21:17

chevu

2-Feb-10 21:17

Hi i think i got the problem. But I dont know how to solve it. Here the dialog I am talking have internally different dialog attached into their body. So focus is not fixed sometimes its that in main dialog sometimes in child dialog. Is there any way that for 3 keys F1, F2, F3 took event in mainframe or main application class. I dont want to pass this 3 key down event to any further dialog,

Re: CDialog ON_WM_KEYDOWN event

chevu2-Feb-10 23:31

chevu

2-Feb-10 23:31

Sorry to bother you guys.. I got solution..
Keyboard messages/accelerators handling in MFC dialog based applications[^]

Re: CDialog ON_WM_KEYDOWN event

Nelek3-Feb-10 20:36

Nelek

3-Feb-10 20:36

You were not bothering, and sorry about the absence (I was pretty busy last days).

Glad that you found a solution Smile | :)

Regards.
--------
M.D.V. Wink | ;)

how to download google apis

anshach1-Feb-10 22:45

anshach

1-Feb-10 22:45

friends,
plz reply this question.

thanks

Repost - please ignore.

CPallini1-Feb-10 23:11

CPallini

1-Feb-10 23:11

Already asked, at least in the Quick Answers [^](and you got some answers...).
Smile | :)

Re: how to download google apis

Game-point2-Feb-10 0:02

Game-point

2-Feb-10 0:02

why do u need for google APIs?

Failure is Success If we learn from it!!

Re: how to download google apis

David Crow2-Feb-10 3:23

David Crow

2-Feb-10 3:23

The Google Maps API have a lot of practical applications, not the least of which is just to learn how it works. To question someone's need for that seems silly.

"One man's wage rise is another man's price increase." - Harold Wilson

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Re: how to download google apis

Nelek2-Feb-10 5:59

Nelek

2-Feb-10 5:59

Well, this is your third time doing this question, and you don't even bother in changing such a lazy content.

In one [^] of them you got an answer from Christian Graus and, in the second one[^], you got an answer from me.

Instead of asking another time, why the hell don't you take a look in your previous questions?

If you continue like that, I bet that you will not end nicely.

Regards.
--------
M.D.V. Wink | ;)

Where Export data section reside in PE? [modified]

glitteringsound1-Feb-10 21:33

glitteringsound

1-Feb-10 21:33

Hello,
What is the exact way to find the export and import sections from PE file?

Regards
Muhammad Usman Khalil

modified on Tuesday, February 2, 2010 5:19 AM

Re: Where Export data section reside in PE?

Richard MacCutchan1-Feb-10 23:28

Richard MacCutchan

1-Feb-10 23:28

See possible answers here[^].

MVP 2010 - are they mad?

Re: Where Export data section reside in PE?

Stuart Dootson2-Feb-10 1:06

Stuart Dootson

2-Feb-10 1:06

Judging by the questions you're asking about the PE format, you'll find this article[^] and this one[^] very useful.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

CodeProject MVP for 2010 - who'd'a thunk it!

what does c++ class allocate in memory image.

aiming04201-Feb-10 21:16

aiming0420

1-Feb-10 21:16

as subject.
how does a class allocated in memory image?
i.e.
class A{
public:
A(void);
virtual ~A(void);

public:
virtual void someMethod(void);
virtual void someMethod2(void);

public:
void someMethod3(void);
void someMethod4(void);

private:
int m_nMenber;
};
A a;
how does these virtual functions and normal functions and member data allocate in memory as part of a.

more complicate:
class B : public A{
public:
B(void);
~B(void);

public:
virtual void someMethod(void);
virtual void someMethod2(void);

public:
void subClassMethod(void);
};

B b;
how does new inherited functions and new created functions allocate in memory as part of b,which is inherited from A?

any professional help would be appreciated!

Re: what does c++ class allocate in memory image.

KingsGambit1-Feb-10 21:21

KingsGambit

1-Feb-10 21:21

Following would be a good read: http://www.openrce.org/articles/files/jangrayhood.pdf[^]

Re: what does c++ class allocate in memory image.

aiming04201-Feb-10 22:14

aiming0420

1-Feb-10 22:14

thanks so much, and you are pretty!

What Relative Virtual Addressing is and the whole story behinds it ?

glitteringsound1-Feb-10 21:01

glitteringsound

1-Feb-10 21:01

Hello

Can any body tell in detail what is relative virtual addressing and all its basics?
Why virtual addressing is needed? How RVA invlolves in execution of PE files(EXEs,DLLs and so on..)

Regards
Muhammad Usman Khalil

Re: What Relative Virtual Addressing is and the whole story behinds it ?

Stephen Hewitt1-Feb-10 21:17

Stephen Hewitt

1-Feb-10 21:17

When the loader loads a DLL or EXE the address it loads it at (the base address) plus the RVA of something of interest in the image will give you its address in memory. Put another way, it's the location of something in memory relative to the base address of the containing module. Remember that DLLs can be relocated if need be so the base address need not always be the same.

Steve

Re: What Relative Virtual Addressing is and the whole story behinds it ?

glitteringsound1-Feb-10 21:54

glitteringsound

1-Feb-10 21:54

thnx ..
A way to go 4 me...

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