C / C++ / MFC Discussion Boards

Michael Schubert24-Mar-09 6:28

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().

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

"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

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.

Re: segmentation fault en strcat()

sankariyo24-Mar-09 22:39

sankariyo

24-Mar-09 22:39

That is not the point!
Even if I am taking care your comment and in the example I change <100 by <99 the problem is not there.

Because as I said before I am sure that the segmentation fault is not because there is not space in the destiny, even if I make bigger the destiny [1000] I still get the segmentation fault.

Re: segmentation fault en strcat()

David Crow24-Mar-09 6:20

David Crow

24-Mar-09 6:20

strcat() appends source to destination, overwriting the null character. Does string have one?

Re: segmentation fault en strcat()

CPallini24-Mar-09 7:09

CPallini

24-Mar-09 7:09

Probably yes, since strlen appears (or as someone already suspected, maybe that the segmention fault occur before the actual call to strcat) to succeed.
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]

Re: segmentation fault en strcat()

David Crow24-Mar-09 7:14

David Crow

24-Mar-09 7:14

Yeah, I did not bother to fully scrutinize his code. It's possible that stringaux has a '\0' but not within the 3 bytes allocated to it.

Re: segmentation fault en strcat()

CPallini24-Mar-09 7:25

CPallini

24-Mar-09 7:25

DavidCrow wrote:
It's possible that stringaux has a '\0' but not within the 3 bytes allocated to it.

But, I suppose, that doesn't harm (it is string the indictee...). Smile | :)

Re: segmentation fault en strcat()

sankariyo24-Mar-09 22:42

sankariyo

24-Mar-09 22:42

I am sure that the problem is in strcat and not in strlen.

Re: segmentation fault en strcat()

CPallini24-Mar-09 22:48

CPallini

24-Mar-09 22:48

Why?
Could you please post a test case (i.e. the input values for the two string) showing the failure?
Smile | :)

Re: segmentation fault en strcat()

SrivathsanRaghavan11-Dec-12 19:37

SrivathsanRaghavan

11-Dec-12 19:37

Can you tell me, Which compiler you are using?

I have tried with same code given above with gcc compiler in Debian, I doesn't get any Segmentation fault.

Its may be because of your compiler.
I too faced the Same problem when i tried to get the String in run time, in tcc. then later I tried with gcc it worked perfectly..

CRunTimeClass with parameters

prithaa24-Mar-09 4:20

prithaa

24-Mar-09 4:20

Hello,

Can a RUNTIME_CLASS macro have a class with parameters ?

CMDIFrameWnd* pFrame = STATIC_DOWNCAST(CMDIFrameWnd,AfxGetApp()-&gt;m_pMainWnd);

CString str = "string";

pFrame-&gt;CreateNewChild(RUNTIME_CLASS(TableF(str),IDR_KTYPE, m_hMDIMenu, m_hMDIAccel);

Prithaa

Re: CRunTimeClass with parameters

Akt_4_U24-Mar-09 6:12

Akt_4_U

24-Mar-09 6:12

RUNTIME_CLASS macro will only take class name as parameter.

prvn

Re: CRunTimeClass with parameters

prithaa24-Mar-09 6:23

prithaa

24-Mar-09 6:23

Hello,

Thanks for your reply.

CMDIFrameWnd* pFrame = STATIC_DOWNCAST(CMDIFrameWnd,AfxGetApp()->m_pMainWnd);

CString str = "string";

pFrame->CreateNewChild(RUNTIME_CLASS(TableF(str),IDR_KTYPE, m_hMDIMenu, m_hMDIAccel);

so when I am making this window and I want to pass parameters what should be done.How can I trace the object of this window.

Pritha

Form Circular Reference?

thenutz7224-Mar-09 4:00

thenutz72

24-Mar-09 4:00

Hey, I am trying to open form2 from form1. Then open a new form1 when form 2 is closed. But adding the #include "Form1.h" header to form2.h is causing errors (undeclared identifier). I added these inclusion guards and tried using forward declaration. EIther that didn't work or I used it wrong because these are the automatically generated code for Forms in the .h file.

/*Form1.h*/
#pragma once
#ifndef First
#define First
#include "Form2.h"

private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {

Form2 ^ frm = gcnew Form2;
frm->Show();
this->Close();
}
#endif

/*Form2.h*/
#pragma once
#ifndef Second
#define Second
#include "Form1.h"

private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {

Form1 ^ frm = gcnew Form1;
frm->Show();
this->Close();
}
#endif

Re: Form Circular Reference?

Cedric Moonen24-Mar-09 4:23

Cedric Moonen

24-Mar-09 4:23

You should post this question in the Managed C++ forum.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Form Circular Reference?

Iain Clarke, Warrior Programmer24-Mar-09 8:47

Iain Clarke, Warrior Programmer

24-Mar-09 8:47

As Cedric said, there is a managed C++ forum - and you should be using it.

But in C/C++, this would work:

class CTwo;  // note we're just telling the compiler it exists

class COne
{
...
  CTwo *m_pTwo;  // good, but needs assigned somewhere
  CTwm m_Two; // can't do this, as we don;t know anything about CTwo except that it exists
};

class Two
{
...
  COne *m_pOne;  // good, but needs assigned somewhere
  COne m_One; // We can do this, as COne has been fully defined.
};

I hope that helps,

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!

bitmap in combobox

Rakesh524-Mar-09 3:28

Rakesh5

24-Mar-09 3:28

Hi,

In the following application, colors are added in the combobox with the help of COLORREF. i want to add bitmap images in that position.

can anyone guide me how can we add bitmap in that place??

The Application link is:
http://www.codeguru.com/cpp/controls/combobox/colourpickers/article.php/c1793[^]

thanks,

Rakesh S

Re: bitmap in combobox

Iain Clarke, Warrior Programmer24-Mar-09 3:51

Iain Clarke, Warrior Programmer

24-Mar-09 3:51

1/ It's a codeguru article - did you get any luck on codeguru's forums?

2/ I've had good success with a codeproject article:
http://www.codeproject.com/KB/miscctrl/colour_picker.aspx[^]

3/ I've written my own combobox like control, where you can put anything you like in the little boxes...
http://www.codeproject.com/KB/miscctrl/generic_picker.aspx[^]

4/ If you look at the code on the original codeguru article, you'll see it handles WM_DRAWITEM, and there will be a couple of lines where it draws the coloured box - just replace that with your own code.

5/ Didn't I already point you at our combobox section? We have several other owner draw combo boxes that you can learn from.

6/ 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!

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