C / C++ / MFC Discussion Boards

Re: Permutations with repetition

CPallini8-Apr-10 3:25

CPallini

8-Apr-10 3:25

You are welcome.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

CFile Dialog Crash on Window Server 2008.

Le@rner5-Apr-10 18:22

Le@rner

5-Apr-10 18:22

Hi all,

i m open CFileDialog to browse file,

in this manner " CFileDialog fileDlg(TRUE, NULL, NULL, OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST|OFN_OVERWRITEPROMPT,_T("Text Files|*.txt|Excel Files|*.xls;*.xlsx|"));
"

some time it works but some times it become not responding and crash on Windows server 2008.

please help me what can i do.

thanks for help in advance.

Re: CFile Dialog Crash on Window Server 2008.

KarstenK5-Apr-10 22:42

KarstenK

5-Apr-10 22:42

xlsx|")); is missing the end-pipe => xlsx||"));

Press F1 for help or google it.
Greetings from Germany

Re: CFile Dialog Crash on Window Server 2008.

Le@rner7-Apr-10 20:49

Le@rner

7-Apr-10 20:49

Now i m chk it with "||" end pipe.but still problem is exist.

and diaplay these details in more info:

<br />
Problem signature:<br />
  Problem Event Name:	APPCRASH<br />
  Application Name:	Test.exe<br />
  Application Version:	6.0.1.4<br />
  Application Timestamp:	4bbd6e29<br />
  Fault Module Name:	Secur32.dll<br />
  Fault Module Version:	6.0.6001.18000<br />
  Fault Module Timestamp:	4791a777<br />
  Exception Code:	c0000005<br />
  Exception Offset:	000021b3<br />
  OS Version:	6.0.6001.2.1.0.274.10<br />
  Locale ID:	1033<br />
  Additional Information 1:	98e2<br />
  Additional Information 2:	6076d0439494b3c22f752162dd29dcbf<br />
  Additional Information 3:	4f76<br />
  Additional Information 4:	e360291dec91efb6c8036cc8226e0089<br />
<br />
Read our privacy statement:<br />
  http://go.microsoft.com/fwlink/?linkid=50163&clcid=0x0409<br />
 <br />

please help me.

Re: CFile Dialog Crash on Window Server 2008.

KarstenK7-Apr-10 22:38

KarstenK

7-Apr-10 22:38

it looks strange like "dll hell".

Check for actual dlls on the server and you dev-pc. Consider static linking.

Press F1 for help or google it.
Greetings from Germany

Stack overflow

browneyes865-Apr-10 16:00

browneyes86

5-Apr-10 16:00

I have trouble with declaring my array size so as to avoid the stack overflow error:

_variant_t raw_data[10000][100]
_variant_t results[10000][100]

i read somewhere about dynamic sizing, i tried this but it didnt work
_variant_t *raw_data = new _variant_t [10000][100]

any help would be very much appreciated..

Re: Stack overflow

David Crow5-Apr-10 16:31

David Crow

5-Apr-10 16:31

buki86 wrote:
i read somewhere about dynamic sizing, i tried this but it didnt work

Why not?

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

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

Re: Stack overflow

Luc Pattyn5-Apr-10 16:52

Luc Pattyn

5-Apr-10 16:52

Hi,

IIRC stack space is limited to 1MB, so you can't create a stack-based array holding 1M elements. You could dynamically allocate it though, using malloc() or new.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

Re: Stack overflow

Tim Craig5-Apr-10 18:20

Tim Craig

5-Apr-10 18:20

I'm going by memory, too, but I think the default stack is 1 Meg but you can set it to be a different size as part of the build. I've never personally done it though. Suspicious | :suss:

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Re: Stack overflow

Luc Pattyn5-Apr-10 18:31

Luc Pattyn

5-Apr-10 18:31

Tim Craig wrote:
but you can set it to be a different size as part of the build.

yeah, that is very plausible, however I never have done so for a Windows app.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

Re: Stack overflow

Luc Pattyn5-Apr-10 18:31

Luc Pattyn

5-Apr-10 18:31

Tim Craig wrote:
but you can set it to be a different size as part of the build.

yeah, that is very plausible; it is common practice for embedded systems, however I never have done so for a Windows app.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

Re: Stack overflow

CPallini5-Apr-10 21:27

CPallini

5-Apr-10 21:27

You remember well [^].
Smile | :)

Re: Stack overflow

Tim Craig6-Apr-10 8:31

Tim Craig

6-Apr-10 8:31

I remember a poem in Mad Magazine in the late 50's that went "I remember, I remember...", but I can't remember what they remembered. Sigh | :sigh:

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Re: Stack overflow

CPallini6-Apr-10 9:23

CPallini

6-Apr-10 9:23

You are lucky. On the other hand:
"I don't remember, I don't recall
I got no memory of anything at all" Big Grin | :-D

Re: Stack overflow

Adam Roderick J5-Apr-10 19:02

Adam Roderick J

5-Apr-10 19:02

Try with malloc, that can used to represent multidimensional array.

int **nArray;
   int nRows = 10000;
   int nColumn = 100;
   nArray = (int**)malloc(nRows * sizeof(int *));
   ZeroMemory( nArray, 0 );
   if( 0 == nArray )
   {
       return 0;
   }
   for(int i = 0; i < nRows; i++)
   {
       nArray[i] = (int*)malloc( nColumn * sizeof(int));
       if( 0 == nArray[i] )
       {
           return 0;
       }
   }

Величие не Бога может быть недооценена.

Re: Stack overflow

browneyes867-Apr-10 4:27

browneyes86

7-Apr-10 4:27

so i tried this but keep getting errors on _variant_t *p line:

****************************************************
initialize array

vector<_variant_t> d(10000);
//_variant_t** 2d = new _(variant_t*)[10000];

for(long k = 0; k < d.size(); ++k)
{
d[k] = new _variant_t();

***********************************************************
delete array

for(k = 0; k < d.size(); ++k)
{
_variant_t* p = d[k]; (error = cannot convert from 'class _variant_t' to 'class _variant_t *')

delete [] p;

}

Re: Stack overflow

jagadish bharath7-Apr-10 5:42

jagadish bharath

7-Apr-10 5:42

hi,
use vector<_variant_t*> d(10000);
instead of
vector<_variant_t> d(10000);

Re: Stack overflow

browneyes867-Apr-10 5:55

browneyes86

7-Apr-10 5:55

Thanks it worked but even after compiling the code, i still get stack overflow:

this is how am declaring my array:

static const int N = 9990;<br />
	static const int N2 = 96;<br />
<br />
		<br />
		vector<_variant_t*> d(N);<br />
	<br />
<br />
	for(long k = 0; k < d.size(); ++k)<br />
	{<br />
		d[k] = new _variant_t();<br />
	}<br />
<br />
<br />
	_variant_t raw_data[N][N2];<br />
<br />
	_variant_t filter_results[N2];<br />
<br />
	_variant_t results2[N][N2]<br />
	<br />
	_variant_t  Filtered_Average[N];

Re: Stack overflow

jagadish bharath7-Apr-10 7:18

jagadish bharath

7-Apr-10 7:18

you are trying to create a multidimenional array on stack. normally stack has a limitation of 2MB but heap can go upto around 100 MB.
create all the variables in heap and importantly delete it after using. this is a classic multi dimension c++ mem allocation.
sample :
_variant_t **raw_data[N];

for(int nOut = 0;nOut < N;nOut++)
{
raw_data[nOut] = new _variant_t*[N2];
for(int nIn = 0;nIn < N2;nIn++)
{
raw_data[nOut][nIn]= new _variant_t(nIn);// sample initialization
}
}

// delete this is important
for(int nOut = 0;nOut < N;nOut++)
{
for(int nIn = 0;nIn < N2;nIn++)
{
delete raw_data[nOut][nIn];
}
delete raw_data[nOut] ;
}

delete breaking heap [modified] - solved

PaulowniaK5-Apr-10 15:21

PaulowniaK

5-Apr-10 15:21

Thanks to everyone who tried to help out.
Sorry, my bad, this was a red herring.
I found out that I was overrunning an array because the spec of other parts of the software had changed without my knowledge.
I've increased the memory allocation accordingly, and it is fine now.

==================================================================

I'm having trouble with destructors and delete.

I have some embedded structure so in order to delete one of my objects, I have to call lots of desctructors in a hierarchical way:

void CMyBigClass::StartKilling()
{
	if(NULL != m_pSubObject1)
	{
		delete m_pSubObject1;
		m_pSubObject1 = NULL;
	}
}
...

CSubObject1::~CSubObject1()
{
	if(NULL != m_pSubObject2)
	{
		delete m_pSubObject2;
		m_pSubObject2 = NULL;
	}
}
...

CSubObject2::~CSubObject2()
{
	if(NULL != m_pSubObject3)
	{
		delete m_pSubObject3;
		m_pSubObject3 = NULL;
	}
}

Normally, if I set a break point on the

delete m_pSubObject1;

line and step in (F11), I land in the first line of the desctructor fo CSubObject1.

However, I jump straight to

delete m_pSubObject3;

where I get a heap error.

I looked into as much as I could, and the debugger isn't lying. The memory it is trying to delete is different from what I told it to delete. Something is trampling over the memory, but I don't know what. I don't know how to find out either.

I've undone all the changes since the last time it was working, but still the same problem.

Please, someone, tell me how to find out what's gone wrong!!

Almost, but not quite, entirely unlike... me...

modified on Tuesday, April 6, 2010 3:16 AM

Re: delete breaking heap

Adam Roderick J5-Apr-10 19:03

Adam Roderick J

5-Apr-10 19:03

Surely some sort of heap corruption. Please show the code of allocation.
And if you can just check with Windbg.

Величие не Бога может быть недооценена.

Re: delete breaking heap [modified]

Eugen Podsypalnikov5-Apr-10 20:22

Eugen Podsypalnikov

5-Apr-10 20:22

PaulowniaK wrote:
However, I jump straight to

0. Can you step to delete m_pSubObject3 too (or jump only ?) ?

1. Please set a breakpoint at the first line of CSubObject3::~CSubObject3() -
maybe, the code will be called earlier (than from CSubObject2::~CSubObject2())... Smile | :)

virtual void BeHappy() = 0;

modified on Tuesday, April 6, 2010 2:47 AM

Re: delete breaking heap [modified] - solved

Tim Craig6-Apr-10 8:34

Tim Craig

6-Apr-10 8:34

Just an aside comment on your code. You do know that you can safely delete a NULL pointer? The check for NULL is done internally to delete so you don't have to check yourself.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

hInstance / Win32

Fareed Rizkalla5-Apr-10 6:19

Fareed Rizkalla

5-Apr-10 6:19

I understand the concept of an instance, but I however don't see the effects of including it over and over.
Any good uses? Smile | :)

Re: hInstance / Win32

Chris Meech5-Apr-10 6:27

Chris Meech

5-Apr-10 6:27

Could you include an example, for instance. Smile | :)

Chris Meech
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