Re: hello ，my questions is about opencv track - C / C++ / MFC Discussion Boards

Re: I need help URGENT plz

David Crow24-Mar-09 6:37

David Crow

24-Mar-09 6:37

Is Date a class of yours? Are getDate() and showDate() static methods?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

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Re: I need help URGENT plz

Mohamed_Khalil24-Mar-09 6:46

Mohamed_Khalil

24-Mar-09 6:46

ya the program ask the user to implemnt the date mm/dd/yy with function int getDate()

and the program should outputs the with void showDate()

but this two function are public members and the ipmlemntation in .cpp file

#include "stdafx.h"
#include "Date.h"
#include <iostream>
using namespace std;

int main()
{
Date d;
cout<<"Enter the date within formam mm/dd/yy\n";
cin>>d.month>>d.day>>d.year
d.getDate();
d.showDate();
system("pause");
return 0;
}

//Date.cpp function

#include "stdafx.h"
#include "Date.h"

using namespace std;

int Date::getDate() //(int month,int day,int year)
{
return(month,day,year);
}

void Date::showDate()
{
cout<<month<<"/"<<day<<"/"<<year<<endl;
}

//HEADER FILE
#ifndef DATE_H
#define DATE_H

class Date
{
public:
int month;
int day;
int year;
int getDate();
void showDate();
};

I think my problem in the passing arguments !!?

Re: I need help URGENT plz

David Crow24-Mar-09 6:56

David Crow

24-Mar-09 6:56

dr.nokia wrote:
return(month,day,year);

What is this?

dr.nokia wrote:
cin>>d.month>>d.day>>d.year

Missing a semicolon.

dr.nokia wrote:
d.showDate();

This statement is not doing anything useful.

dr.nokia wrote:
I think my problem in the passing arguments !!?

No. Arguments are what get passed to functions/methods.

Other than the one syntax error, your code should compile and work as expected. It could be vastly improved, but that is another subject altogether.

Re: I need help URGENT plz

Mohamed_Khalil24-Mar-09 7:04

Mohamed_Khalil

24-Mar-09 7:04

Thanx Mr.Daived

i fixid the semicolon but it not working also Frown | :(

i will try my best and thanx alot for ur help

good luck !!

Re: I need help URGENT plz

CPallini24-Mar-09 7:03

CPallini

24-Mar-09 7:03

What about a good C++ tutorial?

BTW you really need to read this [^], before posting.
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]

hello ，my questions is about opencv track

onlybluemoon24-Mar-09 5:28

onlybluemoon

24-Mar-09 5:28

Ｉ　found　the opencv source of cvcamshift.cpp .I have one problem of cvCamShift function in this file.That is how it change the weidth and hength and orientation .

In cvcamshift.cp:
m00 = moments.m00;
m10 = moments.m10;
m01 = moments.m01;
mu11 = moments.mu11;
mu20 = moments.mu20;
mu02 = moments.mu02;

if( fabs(m00) < DBL_EPSILON )
EXIT;

inv_m00 = 1. / m00;
xc = cvRound( m10 * inv_m00 + windowIn.x );
yc = cvRound( m01 * inv_m00 + windowIn.y );
a = mu20 * inv_m00;
b = mu11 * inv_m00;
c = mu02 * inv_m00;

/* Calculating width & height */
square = sqrt( 4 * b * b + (a - c) * (a - c) );

/* Calculating orientation */
theta = atan2( 2 * b, a - c + square );

/* Calculating width & length of figure */
cs = cos( theta );
sn = sin( theta );

rotate_a = cs * cs * mu20 + 2 * cs * sn * mu11 + sn * sn * mu02;
rotate_c = sn * sn * mu20 - 2 * cs * sn * mu11 + cs * cs * mu02;
length = sqrt( rotate_a * inv_m00 ) * 4;
width = sqrt( rotate_c * inv_m00 ) * 4;

IN a paper:(I am sorry ,It's not clear .But if you want I can send to you.)
The orientation (θ) of the major axis and the scale of the distribution are determined by finding an equivalent rectangle that has the same moments as those measured from the 2D probability distribution image (c.f. Horn, 1986). Defining the first and second moments for x and y
ΣΣ=xyyxIxM),(220
ΣΣ=xyyxIyM),(202
ΣΣ=xyyxxyIM),(11
The first two eigenvalues (the length and width of the probability distribution) are calculated in closed form as follows. From the intermediate variables a, b and c20020cxMMa−= −=ccyxMMb00112 20002cyMMc−=
We find the orientation of the equivalent rectangle −=−cab1tan21θ
The distances l1 and l2 from the distribution centroid (the dimensions of the equivalent rectangle) are given by, 2)()(221cabcal−+++= 2)()(222cabcal−+−+=
Where the extracted parameters are independent of the overall image intensity.

Thank you .I am looking forward to your answer.

Re: hello ，my questions is about opencv track

CPallini24-Mar-09 7:40

CPallini

24-Mar-09 7:40

As far as I can understand, there is no question, in your post.
Smile | :)

Re: hello ，my questions is about opencv track

onlybluemoon24-Mar-09 20:29

onlybluemoon

24-Mar-09 20:29

sorry，I don't understand.Do you say you can't understand me?

hello

Re: hello ，my questions is about opencv track

CPallini24-Mar-09 22:15

CPallini

24-Mar-09 22:15

Simply there is no question in your post: what did you intend to ask? Moreover could you please reformat it? As it stands, it is difficult to understand.
Smile | :)

Re: hello ，my questions is about opencv track

onlybluemoon25-Mar-09 2:45

onlybluemoon

25-Mar-09 2:45

help

hello

Re: hello ，my questions is about opencv track

onlybluemoon25-Mar-09 23:00

onlybluemoon

25-Mar-09 23:00

I rewrite it .Please check http://www.codeproject.com/script/Forums/View.aspx?fid=1647[^]

hello

C++ reading out memory specs [modified]

Fatbuddha 124-Mar-09 5:11

Fatbuddha 1

24-Mar-09 5:11

Hy folks,
I have a little question of reading out the amount of memory that one can use for a program.
I know there exists the method filling up the memory until you get an exception, but this isn't a nice way, right?

So my question: Is there a way to read out memory specs in windows and other platforms as well?
I was just wondering if one of you can thing of a nice platform independent function or approach to calculate the amount of memory available in the system.

Also I am interested to find out the amount of processors to calculate the amount of threads for that platform.

I am sorry for the leaking of knowledge. Sigh | :sigh:

Cheers

You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)

modified on Tuesday, March 24, 2009 11:41 AM

Re: C++ reading out memory specs

Michael Schubert24-Mar-09 5:23

Michael Schubert

24-Mar-09 5:23

Check out GlobalMemoryStatusEx() and the structure MEMORYSTATUSEX on MSDN.

Re: C++ reading out memory specs

Fatbuddha 124-Mar-09 5:33

Fatbuddha 1

24-Mar-09 5:33

Thanks.
But this is just for windows, right? Or do you thing I have to check the op system before doing something. If that is possible.
I am also interested in reading out the sys specs in general. For example the amount of processors to calculate how many threads I could start..

But thanks for pointing me in a direction.

Cheers.

You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)

Re: C++ reading out memory specs

Michael Schubert24-Mar-09 5:45

Michael Schubert

24-Mar-09 5:45

Yes, only for Windows (unless you use something like Wine on Linux).

There are articles about system info in this section: http://www.codeproject.com/KB/system/[^]

Re: C++ reading out memory specs

Fatbuddha 124-Mar-09 6:19

Fatbuddha 1

24-Mar-09 6:19

Thanks you very much.
But still either I am blind or just not seeing it, I can not find a nice function or a set of functions that return me system information.
Actually, if I am allow to keep you busy, I am lacking of knowledge to detecting on which op I am on.
I mean if I can detect what Os I am facing, it is straight forward to use your suggestion for windows and in Linux, I think, the specs are written in a file.
Macs fights for their owns. Smile | :)

But thanks for the great answers.
Cheers

You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)

Re: C++ reading out memory specs

Michael Schubert24-Mar-09 6:28

Michael Schubert

24-Mar-09 6:28

Fatbuddha 1 wrote:
But still either I am blind or just not seeing it, I can not find a nice function or a set of functions that return me system information.

Well, you have to read the articles and look at the code.

Fatbuddha 1 wrote:
I am lacking of knowledge to detecting on which op I am on.

Do you mean which version of the OS? Like Win XP, 2000 etc.? Or Linux, MacOS, Windows?

Re: C++ reading out memory specs

David Crow24-Mar-09 6:39

David Crow

24-Mar-09 6:39

Fatbuddha 1 wrote:
I mean if I can detect what Os I am facing...

To my knowledge, there is not a platform-independent way of determining this. For Windows, check out GetVersionEx().

Re: C++ reading out memory specs

Iain Clarke, Warrior Programmer24-Mar-09 8:39

Iain Clarke, Warrior Programmer

24-Mar-09 8:39

You can't compile a program and expect it to then be copied to any computer and run. So, it's not that bad to make a function in your own code that does different things depending on which operating system it is compiled for (you may be cross compiling for all I know)

Ie:

DWORD HowManyMegaBytesDoIHave ()
{
#ifdef _WINDOWS
  return ThatWindowsAPIFunction ();
#endif
#ifdef _MACOS9
etc

}

I hope that made sense. I'm pretty sure the windows one is real, no idea about the other, but they're just meant to illustrate. You'll have to the same #ifdef with the headers too.

If you want one codebase to work identically on all OS's, then you'll have to scale back your desires a long way.

Good luck,

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: C++ reading out memory specs

Fatbuddha 126-Mar-09 22:52

Fatbuddha 1

26-Mar-09 22:52

Sorry for the late answer.
Of course you are right, what was I thinking??
Spend to much time on Java Smile | :)

.

So to conclude either your way, or I simply provide a version of my prog for win and unix. This might be even the cleaner style.

Thanks and have a nice weekend.
Cheers

You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)

segmentation fault en strcat()

sankariyo24-Mar-09 4:58

sankariyo

24-Mar-09 4:58

Hello.

My program gets "segmentation fault" in "strcat(string,stringaux)" and it is strange because I am sure that string always has space for adding the new stringaux due to before call strcat I check if size of the destiny plus new stringaux is less than string capacity:

char string[100];
char stringaux[3];

void Function()
{
if ((strlen(string)+strlen(stringaux))<100)
{
strcat(string,stringaux)
}
}

In this way strcat() never can make string be longer than 100. But still I get SEGMENTATION DEFAULT.

I have been reading, and the explanation can be that the Stack gets full due to I have many local variables or ...

Is there anybody can tell me some ideas about why SEGMENTATION DEFAULT is produced in strcat() when I am sure that is not because there is not space in the destiny string?

Thanks in advance.

Re: segmentation fault en strcat()

Code-o-mat24-Mar-09 5:17

Code-o-mat

24-Mar-09 5:17

Are you completely sure the segfault comes from strcat? How did you determine this (setting breakpoints, putting traces in the code...)?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: segmentation fault en strcat()

sankariyo24-Mar-09 22:26

sankariyo

24-Mar-09 22:26

Because If I add a comment in the strcat() the segmentation fault does not appear and if I take the comment away the segmentation fault appears.

Re: segmentation fault en strcat()

Code-o-mat24-Mar-09 23:04

Code-o-mat

24-Mar-09 23:04

Hmm...what happens if you increate the string buffer to -let's say- 150 chars? Or increase your stringaux to -let's say- 10 chars? Does anything change? Also, before the strcat, try displaying the 2 strings to see what is in them, printf or puts should do it...

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: segmentation fault en strcat()

Michael Schubert24-Mar-09 5:37

Michael Schubert

24-Mar-09 5:37

Remember that strlen returns the length without the terminating null character.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.