C / C++ / MFC

Re: What is the reason behind this

7-Jun-04 2:37

See if this article helps.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Billar7-Jun-04 2:47

Billar

7-Jun-04 2:47

DEar Friends,

I got the solution. Actually the problem was in the attached lib file. After linking the another or seperate .lib file seperately in Release/Debug mode, problem get solved.

Anyway thanks for your kind co-operation.

Bye

Billar

Memory leak problem

raed5-Jun-04 19:59

raed

5-Jun-04 19:59

dears:
In the following function both Visual C++ 6 and (Insure++ software that detecting memory leaks and bugs) pointing that there are a memory leak in this statement in this function

Since
*CWorkAreaWnd derived from CWnd.
*CDrawObject Derived from CObject and it is the base class for all objects(Shapes here).
* and CDrawObject has m_ObjTracker member function of Type CRectTracker.

code:--------------------------------------------------------------------------------
void CWorkAreaWnd:rawTracker(CDrawObject *pDrawObject , POINT point )
{
/*
** Create Tracker for the selected object.
*/
CPoint n = point ;
CDrawEditor32App * pApp = (CDrawEditor32App*)AfxGetApp();

CDrawEditor32Doc *pDoc = pView->GetDocument();

CRect rect ,objectRect = pDrawObject->getObjectRect();
if (pDrawObject->m_ObjTracker)
{

pDrawObject->m_ObjTracker = NULL;
delete pDrawObject->m_ObjTracker;
}
//////////////////////////////////////////////////////////////////////////////////
pDrawObject->m_ObjTracker = (CTrackerObj *)new CTrackerObj(objectRect,CRectTracker::dottedLine |CRectTracker::resizeInside |CRectTracker::resizeOutside );
//Here compiler and Insure indicate memory leak
/////////////////////////////////////////////////////////////////////////////////
if ((pDrawObject->m_ObjTracker))
{

if(!bArrowKey && !pDoc->pDrawClass->bMultiSelection)
pDrawObject->m_ObjTracker->Track(this, point, TRUE );
else
pDoc->m_Change = TRUE;
pDrawObject->m_ObjTracker->m_rect.NormalizeRect();

CRect TakerRect = pDrawObject->m_ObjTracker->m_rect;
if(!objectRect.EqualRect(TakerRect))
{
rect = pDrawObject->CalculateDimensionRect(TakerRect);
pDrawObject->setObjectRect(rect);
}

}

}
--------------------------------------------------------------------------------

but the problem if i add this at the end of the Fucntion
-------------------------------------------------------
code:
delete pDrawObject->m_ObjTracker;
-------------------------------------------------------------

the program will crash when draw something in screen .
where is the right place to perform free memory in this case?

and why crashing occured since i free memory before the scope of the fucntion end up.

Thanks

Re: Memory leak problem

Johan Rosengren5-Jun-04 21:35

Johan Rosengren

5-Jun-04 21:35

You might get the crash if you don't set pDrawObject->m_ObjTracker to NULL at the end. You will most probably have forgotten to add a delete in the destructor as well Smile | :)

You can, however, make the DrawObject class manage its own memory. Add a function CreateTracker instead of allocating memory in the calling function. In CreateTracker, delete the old tracker if it exists and create a new one with new. Make sure to delete the tracker in the DrawObject destructor.

You are making a maintenance nightmare for yourself by allocating part of a class outside the class, naughty, naughty, naughty *slap on wrist*

Re: Memory leak problem

raed7-Jun-04 7:59

raed

7-Jun-04 7:59

dear:
I got ur point and u r completely right, it is a big nightmare to locate var in calling fucntion, I'm changing the code as u said.

Thanks

Fingerprints

BaldwinMartin5-Jun-04 18:57

BaldwinMartin

5-Jun-04 18:57

Anyone know how to write a getProcessor ID and getProcessor String?

"Naked we come and bruised we go."
- James Douglas Morrison

Best Wishes,
ez_way

Re: Fingerprints

User 66586-Jun-04 0:11

User 6658

6-Jun-04 0:11

Take a look at this

regards

modified 12-Sep-18 21:01pm.

Re: Fingerprints

BaldwinMartin6-Jun-04 2:53

BaldwinMartin

6-Jun-04 2:53

Great answer that you very much1

"Naked we come and bruised we go."
- James Douglas Morrison

Best Wishes,
ez_way

Reading/Writing Files

gabuchholz5-Jun-04 17:19

gabuchholz

5-Jun-04 17:19

Hi, I have created a simple tetris game for a school project alogn with some firends. I currently am having a dilema. I have two problems. One has to do with the topic of this message; I am trying to write the score of the game when ever the score of the current game is higher than the score in the file. So if I played and got 1000 points then died it woudl write 1000 to a file (points.txt), and if you played after and got over 1000 it would override my score with yours, but if you got less it wouldnt... Afterwards I want to read the file and output the score within on the score as "highscore: ___". So how do I do this? Source require please... visual is new to me...I'm used to dev c++. I am lookign for a simple way of reading and writing (like adding a .h and calling on one of its functions to read or write). I know abotu fstream but I cant seem to get it to work..

P.S) the second this I was having problems with is I am lookign for a pause function....but that can wait.

Thanks in advanced
Glen Buchholz

Re: Reading/Writing Files

palbano5-Jun-04 17:52

palbano

5-Jun-04 17:52

>> I know abotu fstream but I cant seem to get it to work..

Your in a school C++ course and no one can show you how to get fstream working? What school is it?

unsigned long score = 0L;

std::ofstream os("sample.txt");
score = 1000;
os << score;
os.close();

std::ifstream is("sample.txt");
is >> score;
is.close();

>. I am lookign for a pause function

::Sleep( 5000); // sleep for 5 seconds

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Reading/Writing Files

gabuchholz5-Jun-04 18:09

gabuchholz

5-Jun-04 18:09

Thanx, so much.
Got it working perfectly Blush | :O

P.S) Its a high school and we do things in Dev C++... which we had fstream workign in...vc++ is a bit different... WTF | :WTF:

Screen Resolution

Renjith Ramachandran5-Jun-04 17:07

Renjith Ramachandran

5-Jun-04 17:07

All resources of my application is designed in 1024 * 768 pixels resolution ,
after changing the resolution in to standard 800 * 600, some of the screen is beyond the visible area. i want to change my application in a manner that that must work in any resolution ( i found some applications do this very nicely ).
is there any code to do this?

and one more thing, how can i get the current resolution of screen and how can i change that by code?

Thankyou

I want to change Myself..Can u help me? Smile | :)

palbano5-Jun-04 17:32

palbano

5-Jun-04 17:32

Well the main stream approach to building desktop applications is to use windowing techniques to avoid any specific screen resolution dependencies. If I ever installed a desktop application that changed my screen resolution on me I would get rid of it faster than you can say “bite me”.

With that said here is a controversial article to that end:

http://www.codeproject.com/gdi/screenresolution.asp[^]

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Renjith Ramachandran6-Jun-04 5:16

Renjith Ramachandran

6-Jun-04 5:16

i want an API/code for changing to any resolution that supported by my graphics card.

thank you.

I want to change Myself..Can u help me? Smile | :)

User 66586-Jun-04 7:30

User 6658

6-Jun-04 7:30

ChangeDisplaySettings is what you want.

modified 12-Sep-18 21:01pm.

PropertyPage, OnInitDialog, and SetFocus

alex.barylski5-Jun-04 18:32

alex.barylski

5-Jun-04 18:32

Just a guess, but I would figure you'd find the screen dimensions inside GetSystemMetrics

How do I print my voice mail?

PJ Arends5-Jun-04 14:25

5-Jun-04 14:25

Hey All,

I am having a small problem setting the focus to a control on a property page in my OnInitDialog() function.

BOOL CPage::OnInitDialog()
{
    CPropertyPage::OnInitDialog();
<snip>
    if (some_condition)
    {
        m_Edit.SetReadOnly();
        m_ComboBox.SetFocus();
    }
    else
        m_Edit.SetFocus();
 
    return FALSE;  // return TRUE unless you set the focus to a control
}

It does not matter if some_condition is TRUE or FALSE, the m_Edit control always has the input focus. m_Edit is the first control in the tab order. Does returning FALSE from OnInitDialog() not work for property pages, or am I missing something?

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

David Crow7-Jun-04 2:46

7-Jun-04 2:46

For a CPropertyPage-derived class, you need to use the OnSetActive() method instead.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

PJ Arends7-Jun-04 5:17

7-Jun-04 5:17

Ok, I am starting to feel like a complete idiot. I still can't get this to work.

BOOL CPage::OnSetActive()
{
    BOOL ret = CPropertyPage::OnSetActive();
    if (some_condition)
        m_Combo.SetFocus();
    return ret;
}

m_Combo.SetFocus is called successfully, but the focus remains on the edit control when the page finally shows.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

David Crow7-Jun-04 5:23

7-Jun-04 5:23

How about:

#define MSG_SETFOCUS WM_APP+1
 
// need message map entry
 
BOOL CPage::OnSetActive()
{    
    BOOL ret = CPropertyPage::OnSetActive();    
    if (some_condition)        
        PostMessage(MSG_SETFOCUS);
    return ret;
}
 
LRESULT CPage::MySetFocus( WPARAM, LPARAM )
{
    m_Combo.SetFocus();    
}

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

PJ Arends7-Jun-04 6:37

7-Jun-04 6:37

That definitely works, thanks. I will use that hack for now.

But is it really necessary to go through that that type of hack to set the focus to a control? There is obviously something that I am missing.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

David Crow7-Jun-04 7:05

7-Jun-04 7:05

'Tis not a hack:

http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q148/3/88.asp&NoWebContent=1

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

PJ Arends7-Jun-04 7:13