C / C++ / MFC

Re: Static class members [modified]

16-May-11 5:52

How about such example:

DWORD __stdcall xxx::Monitor(LPVOID lParam)
{
	HINSTANCE hExe = ::GetModuleHandle(NULL);
	if (!hExe) hExe = ::LoadLibrary((LPCSTR)lParam);
	if (!hExe) ::ExitThread(-1);
	m_pThis->m_hMonitorHook = 
		::SetWindowsHookEx (WH_MOUSE_LL, MsgMonitorStatic, hExe, 0);
	if(m_pThis->m_hMonitorHook == NULL)
	{
		::ExitThread(-1);
	}
	m_pThis->MonitorMessagePump();
	UnhookWindowsHookEx(m_pThis->m_hMonitorHook);
	return 0;
}
....
m_hMonitorThread = ::CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Monitor, whatever, 
		CREATE_SUSPENDED, &m_dwMonitorThreadId);

MsgMonitorStatic also uses m_pThis to access class members and functions, modify them, call them, check them? Here i gave small example, in my project there are hundreds of lines of a code of methods which call another methods.

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Stefan_Lang16-May-11 6:11

Stefan_Lang

16-May-11 6:11

I can see no purpose the variable m_pThis serves, and I do not know why it is considered neccessary here. Nor do I see anything that's actually static. In fact, since you said that stuff is being modified, the member functions cannot be static. So I don't know why you think this is in any way relevant to your problem.

The question is what do you want to achieve? As long as we don't know that we cannot advise you how best to implement it.

P.S.: This is just a guess, but it's possible that in the code you've posted the pointer m_pThis is meant as a means to implement the 'Singleton' design pattern. If so, then this has nothing to do with the usage of static methods or static variables: static members require no instance at all, like in the code example I gave above, whereas a singleton requires exactly one instance.

Also I am under the impression that such a construct isn't well suited to implement a singleton. But that is just an IMHO, and only a guess, since there is too little code to really get the picture.

modified on Monday, May 16, 2011 12:25 PM

Creating a window without focus [modified]

csrss15-May-11 2:25

15-May-11 2:25

Hey guys. First things first, i am using MFC.
Ok, the question is, what is the best way to create a new window so this new window will not receive a focus?
Its like this: i got a simple dialog box app and a button on it. When i click a button, it creates a new window, without any caption, just a popup window (WS_POPUP). But this little popup wnd gets focus and i dont want this. I want it be created but the focus should stay on Dialog box window. Besides, if i move a mouse or click on this popup window - it should not receive a focus, it should be kinda "focusless" - no matter what you do - it should not receive any focus ever. How this can be done?
Edit: Maybe i should rephrase a little bit: this popup sets itself as foreground window, dialog box window should stay as foreground, not popup window
Thanks

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0110010101110011

modified on Sunday, May 15, 2011 8:33 AM

Luc Pattyn15-May-11 2:45

Luc Pattyn

15-May-11 2:45

isn't that what enabled/disabled is for? Not sure how to do it in MFC, but that is what I would have a look at.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

csrss15-May-11 2:50

15-May-11 2:50

Nope.

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0110010101110011

Alain Rist15-May-11 3:43

Alain Rist

15-May-11 3:43

Hi,
Your popup should handle WM_ACTIVATE with:

if (wParam != WA_INACTIVE) 
    ::SetActiveWindow(::GetParent(GetSafeHwnd()));

cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

csrss15-May-11 4:57

How to get the keyboard event?

15-May-11 4:57

Thank you!

011011010110000101100011011010000110100101101110
0110010101110011

sharanu14-May-11 23:06

sharanu

14-May-11 23:06

Hi all,
I have created one application,where i am incrmenting and decrementing values using CSpinControl.
It is incrementing and decrmenting.
Now i want to increment and decement the same using keyboard up and event press using keyboard.

void CTestDlg::OnDeltaposSpinTest(NMHDR* pNMHDR, LRESULT* pResult) 
{
	NM_UPDOWN* pNMUpDown = (NM_UPDOWN*)pNMHDR;
	// TODO: Add your control notification handler code here
	if (pNMUpDown->iDelta == 1)
	{
	//	num = num + resolution;
			//flag_value=1;
			m_strvalue--;
		UpdateData(FALSE);
	}
	else
	{
	//	num = num - resolution;
			//flag_value=0;
			m_strvalue++;
	UpdateData(FALSE);
	}

	*pResult = 0;
}


void CTestDlg::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	m_strvalue--;
		UpdateData(FALSE);
	CDialog::OnKeyUp(nChar, nRepCnt, nFlags);
}

void CTestDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
		m_strvalue++;
	UpdateData(FALSE);
	CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}

but it is not doing it.

can anyone help me.

Hi,,
I am sharan.Working as a software Engineer in Indo-Fuji Software Company located in BTM Layout.Bangalore.India.
I have Completed my B.E(COmputers)in 2006.ANd I am having 2 years of Exp in VC++.
thanking you
sharan

Re: How to get the keyboard event?

«_Superman_»15-May-11 2:00

«_Superman_»

15-May-11 2:00

You do not need to write a single line of code.
Just set the Arrow Keys property of the spin control to True.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: How to get the keyboard event?

Mark Salsbery15-May-11 8:39

Mark Salsbery

15-May-11 8:39

...and it is probably not working because the dialog doesn't have keyboard focus....a control on the dialog probably does.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Edit Text

john563214-May-11 22:46

john5632

14-May-11 22:46

How to edit text in CListCtrl?
I am using InsertItem() but every time its adding new item in list control.I need to modify existing item.
I am using report style.

Re: Edit Text

Mark Salsbery14-May-11 22:58

Mark Salsbery

14-May-11 22:58

Maybe CListCtrl::SetItemText()?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Edit Text

Hans Dietrich14-May-11 23:08

Hans Dietrich

14-May-11 23:08

If you mean, you want to let the user modify existing text, take a look at: Editing Sub-Items in List Control[^]

Best wishes,
Hans

[Hans Dietrich Software]

Re: Edit Text

Alain Rist14-May-11 23:15

Alain Rist

14-May-11 23:15

john5632 wrote:
How to edit text in CListCtrl?

The answer is here[^].
cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

LButtonDown Event on Button

sharanu14-May-11 22:00

sharanu

14-May-11 22:00

Hi All,
I am trying to create a application,where,
when i click the button and hold the mouse the value should be incrementing until i release the mouse button.
How can i do it.

I am tying with below code:

void CTestDlg::OnButtonUp() 
{
	// TODO: Add your control notification handler code here

    UpdateData(TRUE);
	m_strvalue++; // edit box member function incrementing
	UpdateData(FALSE);


}

void CTestDlg::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default
  	if(flag_value==1)
	{
	       	m_strvalue++;
		UpdateData(FALSE);
	
	}
	}

void CTestDlg::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	flag_value=0;
	CDialog::OnLButtonUp(nFlags, point);
}

void CTestDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	flag_value=1;
	CDialog::OnLButtonDown(nFlags, point);
}

I am calling this OnLButtonUp event,but it is for whole dialog.i.e wherever i click and hold mouse on dialog the value is incrementing.
I want the same action on OnButtonUp(i.e when i click and hold the Button)

Thanks in advance

Sharan

Re: LButtonDown Event on Button

Hans Dietrich14-May-11 22:53

Hans Dietrich

14-May-11 22:53

The usual way to do a repeating button is by writing a custom button control. For example, see here: http://www.codeproject.com/script/Articles/ListVersions.aspx?aid=1104[^]

You can approximate the action of an auto-repeat button by using a timer: when the timer event occurs, check if the left mouse button is down; if it is, and if the mouse is in the button rect, then increment your counter. Note that you will also have to check if the mouse leaves the button, at which point you should kill the timer.

Best wishes,
Hans

[Hans Dietrich Software]

add menu item

john563214-May-11 16:05

john5632

14-May-11 16:05

How to add sub item in menu?

Re: add menu item

Mark Salsbery14-May-11 16:20

Mark Salsbery

14-May-11 16:20

MFC? Win32?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: add menu item

Richard MacCutchan14-May-11 21:23

Richard MacCutchan

14-May-11 21:23

Start by searching in MSDN[^].

The best things in life are not things.

Re: add menu item

Alain Rist14-May-11 22:02

Alain Rist

14-May-11 22:02

john5632 wrote:
How to add sub item in menu?

The answer is here[^].
cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

Who calls main()

Pranit Kothari13-May-11 22:53

Pranit Kothari

13-May-11 22:53

Hello,
I am C,C++/VC++ developer. I wanted to know, as in every C/C++ program there is startup function main(), who calls this function. I know OS, but I want some in detail answer. Also I wanted to know how my program actually starts, means how it is loaded in memory, who loads it and etc..

Thanks in advance.
Regards

Paul Michalik14-May-11 0:42

Paul Michalik

14-May-11 0:42

This question can only be answered by looking at a specific OS. In general the OS starts the respective runtime which in turn calls into main after doing some initialization work. If you want to know the exact call stack for YOUR system, just hold on in the properly configured debugger at some point of the program and trace back to the roots... Use breakpoints on visible global objects with non-trivial constructors to see what's happening before the program enters main. At least on Windows you will be able to trace back the runtime-code as well.

Cheers,

Paul

Luc Pattyn14-May-11 2:42

Luc Pattyn

14-May-11 2:42

The operating system takes care of loading an executable file into memory, and then starts executing it at a specific point in the code, known as the "entry point". It has a special field in the EXE file format, which obviously gets filled by the linker from the information it got from the compiler. The entry point's name may vary, in C it normally is called main, and sometimes WinMain. In other languages it may be called differently, it is basically a convention between the programmer and the compiler.

For Windows, you can get the EXE file format specification here[^]. That will keep you busy for a while!

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Richard MacCutchan14-May-11 2:58

Richard MacCutchan

14-May-11 2:58

Luc Pattyn wrote:
The entry point's name may vary, in C it normally is called main, and sometimes WinMain.

Not quite; these are the start points for the user part of the application, and are called by the initialisation routine, which is why (Win)main() has to have a specific signature. The actual entry point of the exe is much earlier and is part of the framework library that is automatically added by the linker.

The best things in life are not things.