C / C++ / MFC Discussion Boards

ashtwin18-Oct-10 18:31

18-Oct-10 18:31

Hi,
while using the function LPtoDP i am getting the error "Arithmetic result exceeded 32 bits".
I am not able the find the root cause of the problem. I am using x = 1000 in SetViewportExt and
x = 500 * (some dynamic value) in SetWindowExt. Is it Ok if i reduce x = 100 in SetViewportExt and x = 50 * (some dynamic value) in SetWindowExt.

Re: Overflow in LPtoDP function

Richard MacCutchan18-Oct-10 22:35

Richard MacCutchan

18-Oct-10 22:35

ashtwin wrote:
Is it Ok if i reduce x = 100 in SetViewportExt and x = 50 * (some dynamic value) in SetWindowExt.

Certainly it is, but that does not necessarily solve your problem; in my own experience LPtoDP works fine.

The first thing you should be doing is to use your debugger to find out why the overflow is occurring and fix that problem. Then you can decide whether you need to reduce or possibly increase some of your parameter values.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: Overflow in LPtoDP function

ashtwin19-Oct-10 3:11

ashtwin

19-Oct-10 3:11

Thanks for replying.
Actually this error occured only twice and i am not able to reproduce it.
I have the following traces
Conversion from LPtoDP failed.

>::LPtoDP(dc.GetSafeHdc(), points, noPoints);

noPoints = 2.
ViewportExt.cx: 1000
ViewportExt.cy: 616
ViewportOrg.x: 0
ViewportOrg.y: 0
WindowExt.cx: 500
WindowExt.cy: 1000
WindowOrg.x: 68207250
WindowOrg.y: 0
points[0]: x = 68207250 y = 0
points[1]: x = 68207742 y = 1000.

But i am not able to find out which parameter value is exceeding.

Re: Overflow in LPtoDP function

Richard MacCutchan19-Oct-10 4:30

Richard MacCutchan

19-Oct-10 4:30

Your x values do indeed seem rather large, and it may be that when converting to the device co-ordinates you have exceeded the limit of 27 bits. For example if your mapping is 2 device points to 1 logical, then your x value in device co-ordinates will immediately overflow into 28 bits.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: Overflow in LPtoDP function

ashtwin21-Oct-10 23:09

ashtwin

21-Oct-10 23:09

Hi,
You are correct the x value is the root cause of the problem but i can't avoid this value. Is there any way to avoid overflow by doing some changes.

Re: Overflow in LPtoDP function

Richard MacCutchan22-Oct-10 2:44

Richard MacCutchan

22-Oct-10 2:44

Simple mathematics would suggest that the only way to improve this situation is to find a way of ensuring that the x-value is within a reasonable range. The rules are the rules I am afraid.

Just say 'NO' to evaluated arguments for diadic functions! Ash

static text box new line problem

raju_shiva18-Oct-10 18:04

raju_shiva

18-Oct-10 18:04

Hi,
I am trying to enter some messages in the static text box.
But the messages are coming continously.
How can i display the messages to the newline.

Thanks
Raj

Re: static text box new line problem

vasu_sri18-Oct-10 19:01

vasu_sri

18-Oct-10 19:01

you can use newline '\n' constant in your string where you want to break the string.

Regards,
Srinivas

How to use " CMFCPropertyGridProperty "to have a button

stevenyes18-Oct-10 5:42

stevenyes

18-Oct-10 5:42

I want to use class CMFCPropertyGridProperty to add a button,and when i click the button,it can pop a dialog which
i defined it by myself.
it trobuled me a long time.

when i see the information online,it told me that i can use CMFCPropertyGridProperty::hasbutton method,but it's a protect member,and i am new do this,i really don't know how to do it.

help me...
thanks a lot

Re: How to use " CMFCPropertyGridProperty "to have a button

Andrew Truckle28-Feb-24 7:58

Andrew Truckle

28-Feb-24 7:58

As a minimum you create a new class that inherits from the base class. Then you can override the HasButton method and get it to return true.

Now you will get a small … button when you use this new class for your property. If you look at the MFC source code you will see that you can also override OnButtonClick to detect when the button is clicked.

This is as much as I have found out so far.

On the Origin of CTabCtrlEx used in Tabbed Dialogs

federico.strati18-Oct-10 4:00

federico.strati

18-Oct-10 4:00

Hello,

this is a bit of a strange question: I have a CTabCtrlEx class
that was passed to me for doing tabbed dialog forms: in substance
it is a class that allows dialogs to be inscribed inside a
tabbed control. It is probably a well known class but I cannot find
the origin of it (maybe Jeff Prosise's, but I don't know for certain).
Hence the question is, do you know any reference to this class in
the literature ?

I attach here the class itself

---- header ----

#if !defined(AFX_TABCTRLEX_H__INCLUDED_)
#define AFX_TABCTRLEX_H__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// TabCtrlEx.h : header file

#define TBC_NO_IMAGE			-1

class CTabCtrlEx : public CTabCtrl
{
private:
	BOOL m_bDeleteItemDlg;
	BOOL m_itemRectIsValid;
	CRect m_itemDlgRect;
	CDialog* m_pLastSelDlg;

public:
	CTabCtrlEx(BOOL bDeleteItemDlg = FALSE);
	~CTabCtrlEx();

	BOOL InitItem(UINT nIDTemplate, CDialog* pDlg, CDialog* pParent);

	int AddItem(LPTSTR lpczText, CDialog* pDlg, int nImage = TBC_NO_IMAGE);
	
	int GetItem(CDialog* pDlg);
	int GetItem(LPCTSTR lpczText);

	CDialog* GetNextItem(int nItem);
	
	BOOL RemoveItem(CDialog* pDlg);
	BOOL RemoveItem(LPCTSTR lpczText);
	
	void RemoveAllItems(BOOL bDeleteDlg);
	
	CDialog* GetSelectedItemDlg();
	BOOL SetSelectedItemDlg(CDialog* pDlg);
	
	void SetItemDlgRect(LPRECT lprect);
	BOOL GetItemDlgRect(LPRECT lprect);

	BOOL ShowSelectedItemDlg();

	virtual BOOL DestroyWindow();

protected:
	afx_msg void OnTcnSelchange(NMHDR *pNMHDR, LRESULT *pResult);
	DECLARE_MESSAGE_MAP()	
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_TABCTRLEX_H__INCLUDED_)

---- header ----

---- body ----

// TabCtrlEx.cpp : implementation file
//

#include "stdafx.h"
#include "TabCtrlEx.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

/////////////////////////////////////////////////////////////////////////////
// CTabCtrlEx dialog
CTabCtrlEx::CTabCtrlEx(BOOL bDeleteItemDlg /*FALSE*/)
{
	m_bDeleteItemDlg = 	bDeleteItemDlg;
	m_itemRectIsValid = FALSE;
	m_pLastSelDlg = NULL;
}

CTabCtrlEx::~CTabCtrlEx()
{
}


BEGIN_MESSAGE_MAP(CTabCtrlEx, CTabCtrl)
	ON_NOTIFY_REFLECT(TCN_SELCHANGE, OnTcnSelchange)
END_MESSAGE_MAP()

BOOL CTabCtrlEx::DestroyWindow()
{
	if(m_bDeleteItemDlg)
		RemoveAllItems(m_bDeleteItemDlg);
	return CTabCtrl::DestroyWindow();
}

int CTabCtrlEx::AddItem(LPTSTR lpczText, CDialog* pDlg, int nImage /*TBC_NO_IMAGE*/)
{
	int nItem = GetItemCount(); 	
	TCITEM item;
	item.mask = TCIF_TEXT|TCIF_PARAM;
	item.pszText = lpczText;
	item.lParam = (DWORD) pDlg; 	
	if(nImage != TBC_NO_IMAGE)
	{
		item.mask |= TCIF_IMAGE;
		item.iImage = nImage;
	}

	return InsertItem(nItem, &item); 	
}

BOOL CTabCtrlEx::InitItem(UINT nIDTemplate, CDialog* pDlg, CDialog* pParent)
{
	if(!pDlg->m_hWnd && !pDlg->Create(nIDTemplate, pParent))
		return FALSE;
	if(m_itemRectIsValid)
		pDlg->SetWindowPos(NULL, m_itemDlgRect.left, m_itemDlgRect.top, m_itemDlgRect.Width(), m_itemDlgRect.Height(), 
						SWP_NOZORDER|SWP_HIDEWINDOW);
	
	return TRUE;
}

int CTabCtrlEx::GetItem(CDialog* pDlg)
{
	TCITEM item;
	item.mask = TCIF_PARAM;
	
	int nCount = GetItemCount();
	for(int i = 0; i < nCount; i++)
		if(CTabCtrl::GetItem(i, &item) && item.lParam == (DWORD) pDlg)
			return i;
	return -1;
}

int CTabCtrlEx::GetItem(LPCTSTR lpczText)
{
	TCHAR czText[MAX_PATH];
	TCITEM item;
	item.mask = TCIF_TEXT;
	item.pszText = czText;
	item.cchTextMax = MAX_PATH - 1;
	
	int nCount = GetItemCount();
	for(int i = 0; i < nCount; i++)
		if(CTabCtrl::GetItem(i, &item) && _tcscmp(item.pszText, lpczText) == 0)
			return i;
	return -1;
}

CDialog* CTabCtrlEx::GetNextItem(int nItem)
{
	int nCount = GetItemCount();
	if(nItem >= nCount)
		return NULL;

	TCITEM item;
	item.mask = TCIF_PARAM;
	if(!CTabCtrl::GetItem(nItem, &item))
		return NULL;

	return (CDialog*) item.lParam;
}

BOOL CTabCtrlEx::RemoveItem(CDialog* pDlg)
{
	int nItem = GetItem(pDlg);
	return nItem >=0 ? CTabCtrl::DeleteItem(nItem) : FALSE; 
}

BOOL CTabCtrlEx::RemoveItem(LPCTSTR lpczText)
{
	int nItem = GetItem(lpczText);
	return nItem >=0 ? CTabCtrl::DeleteItem(nItem) : FALSE; 
}

void CTabCtrlEx::RemoveAllItems(BOOL bDeleteDlg)
{
	int nItem = 0;
	CDialog* pDlg = GetNextItem(nItem);
	while(pDlg)
	{
		CTabCtrl::DeleteItem(nItem);
		if(bDeleteDlg)
		{
			if(m_pLastSelDlg == pDlg)
				m_pLastSelDlg = NULL;
			pDlg->DestroyWindow();
			delete pDlg;
		}
		
		//Do not increment nItem: delete always first
		pDlg = GetNextItem(nItem);
	}
}

CDialog* CTabCtrlEx::GetSelectedItemDlg()
{
	int nSel = GetCurSel(); 
	if(nSel == -1)
		return NULL;
	TCITEM item;
	item.mask = TCIF_PARAM;
	if(!CTabCtrl::GetItem(nSel, &item))
		return NULL;

	return (CDialog*) item.lParam;
}

BOOL CTabCtrlEx::SetSelectedItemDlg(CDialog* pDlg)
{
	int nItem = GetItem(pDlg);
	nItem = SetCurSel(nItem);
	return nItem >= 0 ? TRUE : FALSE;
}

BOOL CTabCtrlEx::ShowSelectedItemDlg()
{
	CDialog* pCurSelDlg = GetSelectedItemDlg();
	if(m_pLastSelDlg == pCurSelDlg)
		return TRUE;
	if(m_pLastSelDlg)
		m_pLastSelDlg->ShowWindow(FALSE);
	m_pLastSelDlg = pCurSelDlg;
	if(m_pLastSelDlg)
		m_pLastSelDlg->ShowWindow(TRUE);

	return m_pLastSelDlg != NULL;
}

void CTabCtrlEx::SetItemDlgRect(LPRECT lprect) 
{ 
	m_itemDlgRect = lprect; 
	m_itemRectIsValid = TRUE; 
}

BOOL CTabCtrlEx::GetItemDlgRect(LPRECT lprect) 
{ 
	if(!lprect || !m_itemRectIsValid)
		return FALSE;
	
	lprect->top = m_itemDlgRect.top;
	lprect->left = m_itemDlgRect.left;
	lprect->bottom = m_itemDlgRect.bottom;
	lprect->right = m_itemDlgRect.right;

	return TRUE;
};

void CTabCtrlEx::OnTcnSelchange(NMHDR *pNMHDR, LRESULT *pResult)
{
	ShowSelectedItemDlg();
	*pResult = 0;
}

---- body ----

Re: On the Origin of CTabCtrlEx used in Tabbed Dialogs

Electron Shepherd18-Oct-10 6:16

Electron Shepherd

18-Oct-10 6:16

federico.strati wrote:
do you know any reference to this class in the literature ?

What information are you after? You have the full source, so in one sense it is fully documented. Are you concerned about using copyrighted code?

Server and Network Monitoring

How can get Domain name in given URL?

Le@rner18-Oct-10 2:44

Le@rner

18-Oct-10 2:44

Hi all,

How can get Domain name in given URL?

thanks in advance.

Re: How can get Domain name in given URL?

C^hris L^osinger18-Oct-10 3:00

C^hris L^osinger

18-Oct-10 3:00

http://en.wikipedia.org/wiki/Uniform_Resource_Locator#Syntax[^]

image processing toolkits | batch image processing

Re: How can get Domain name in given URL?

Code-o-mat18-Oct-10 8:58

Code-o-mat

18-Oct-10 8:58

Am not sure exactly what you mean but you might be looking for UrlGetParh[^].

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Leela: Fry, you're wasting your life sitting in front of that TV. You need to get out and see the real world.
Fry: But this is HDTV. It's got better resolution than the real world <

fitnesse about C++

lxlenovostar18-Oct-10 2:12

lxlenovostar

18-Oct-10 2:12

hello, i want to use finesse with C++, and i have installed fitnesse, but i don't know how to
install fitcpp in linux. can you help? thanks.

Re: fitnesse about C++

Maximilien18-Oct-10 3:42

Maximilien

18-Oct-10 3:42

fitnesse ? finesse ?

what is that ? link ?

Watched code never compiles.

Re: fitnesse about C++

lxlenovostar18-Oct-10 3:59

lxlenovostar

18-Oct-10 3:59

yes, http://fitnesse.org/[^]

Re: fitnesse about C++

Richard MacCutchan18-Oct-10 9:31

Richard MacCutchan

18-Oct-10 9:31

Well you have the link to the best place for an answer to your question. Use the documentation, tutorials, user group etc.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: fitnesse about C++

lxlenovostar18-Oct-10 15:57

lxlenovostar

18-Oct-10 15:57

in fact, the fitnesse is for java. so the information about c++ is little. i will look again.

thank you

Re: fitnesse about C++

Aescleal18-Oct-10 21:39

Aescleal

18-Oct-10 21:39

No idea who's been throwing the 1 votes around here so have a 5 in consolation - I'd personally love to be able to try fitnesse with C++ development but being a lazy sod I've never given it a go as the docs for fitcpp were pretty dire 5 years ago. If you do find out how to install it please drop a link or describe the process here. Even if you can't get it going then the likes of me would still be interested in what's gone wrong.

Cheers,

Ash

PS: You've probably seen this already, but Alan Griffiths wrote an article on fitcpp back in 2004 for the ACCU[^]. It's crap at what you need to do to install fitcpp but goes into some detail about how to write tests and fixtures afterwards.

Re: fitnesse about C++

lxlenovostar18-Oct-10 23:12

lxlenovostar

18-Oct-10 23:12

thanks for your help

Re: fitnesse about C++

lxlenovostar19-Oct-10 20:43

lxlenovostar

19-Oct-10 20:43

hello i think i find another way. http://schuchert.wikispaces.com/cpptraining.GettingStartedWithFitNesseInCpp[^]

Re: fitnesse about C++

Aescleal20-Oct-10 7:36

Aescleal

20-Oct-10 7:36

thanks, I'll have a look when I get a moment.

Cheers,

Ash

Problem with SelectObject()

ashtwin17-Oct-10 23:52

ashtwin

17-Oct-10 23:52

Hi,
I am using SelectObject() in my code but confused with the MSDN description.

CFont font;	
font.CreateFont(-12, 0, 0, 0, 400, FALSE, TRUE, FALSE, ANSI_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY, FIXED_PITCH | FF_MODERN, _T("Courier New"));	
CFont* oldFont = pdc->SelectObject(font);	
pdc->TextOut(0, 0, str);	
pdc->SelectObject(oldFont);	
font.DeleteObject();

As per MSDN we should not use the object return by SelectObject because it is a temporary one.
But if we are restoring the old GDI object in the above way will it cause any problem
because the same dc can be used in some other place.

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