Re: Enumerating users - C / C++ / MFC Discussion Boards

Deepu Antony1-Apr-09 2:09

1-Apr-09 2:09

Hi everybody

I am having a small querry

int * p = new int(10);
int a = 10;
int * q = &a;

then to delete pointer p
delete * p;

Whether pointer q is also created on the heap.
If so how to delete it?
Is q = NULL is correct?

Re: pointer deletion querry

Rajesh R Subramanian1-Apr-09 2:12

Rajesh R Subramanian

1-Apr-09 2:12

Deepu Antony wrote:
delete * p;

It's like:

delete p;

Deepu Antony wrote:
Whether pointer q is also created on the heap.

Nope, heap allocation occurs only when you use any of the heap allocation functions (new, calloc, malloc, etc.,)

Deepu Antony wrote:
Is q = NULL is correct?

No. q has the address of the variable a. And can be pointing to some random value if you hadn't assigned it like that.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: pointer deletion querry

Cedric Moonen1-Apr-09 2:12

Cedric Moonen

1-Apr-09 2:12

Deepu Antony wrote:
Whether pointer q is also created on the heap.
If so how to delete it?
Is q = NULL is correct?

No, q is not allocated on the heap. It just contains the address of a, you didn't allocate anything for it. Keep in mind a very simple rule: for each call to new, you should have a matching delete. No more, no less. In this case, you have one single new (for the p pointer), so you have to call delete on this pointer, and that's it.

Cédric Moonen
Software developer

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

Re: pointer deletion querry

Deepu Antony1-Apr-09 2:15

Deepu Antony

1-Apr-09 2:15

Thank you all very much.

Re: pointer deletion querry

CPallini1-Apr-09 2:17

CPallini

1-Apr-09 2:17

Deepu Antony wrote:
Whether pointer q is also created on the heap.
If so how to delete it?

If the momory pointed by q (pointers are ususally created on the stack) is created on the heap then you must use delete.

Deepu Antony wrote:
Is q = NULL is correct?

Again, when q points heap-allocated memory you've to delete it. Invalidating the pointer afterward is a good pactice (for instance):

int * q;
q = new int[10];
//...
//...
if (q) delete [] q;
q = NULL;

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: pointer deletion querry

ThatsAlok1-Apr-09 18:48

ThatsAlok

1-Apr-09 18:48

If you delete memory, which you didn't allocate dynamically, you surly putting yourself in trouble.

Remember simple rule, you only need to delete the memory, which is you allocate to the program!

<blockquote class="FQ"><div class="FQA">Deepu Antony wrote:</div>Is q = NULL is correct?</blockquote>

yes!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Enumerating users

Eikthrynir1-Apr-09 1:50

Eikthrynir

1-Apr-09 1:50

Hello!

There are LsaEnumerateLogonSessions and LsaGetLogonSessionData functions which can be used to get information about the logon sessions.

But is there a way to enumerate the users that are NOT logged on?

Thanks in advance!

Re: Enumerating users

Iain Clarke, Warrior Programmer1-Apr-09 2:00

Iain Clarke, Warrior Programmer

1-Apr-09 2:00

Thinking about what you're asking...

There's local users...

There's users of domain AAAA - which would require lots of traffic...
There's users of domain BBBB - which would require lots of traffic...
There's users of domain CCCC - which would require lots of traffic... oh, and this domain server is in Mongolia. Their head office guy is visiting this week.

And so on.

So, I strongly doubt it!

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: Enumerating users

David Crow1-Apr-09 3:04

David Crow

1-Apr-09 3:04

Eikthrynir wrote:
But is there a way to enumerate the users that are NOT logged on?

Such as NetUserEnum()?

"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: Enumerating users

Eikthrynir2-Apr-09 3:15

Eikthrynir

2-Apr-09 3:15

I think this is what I have been looking for. Thanks a lot!

Re: Enumerating users

ThatsAlok1-Apr-09 18:59

ThatsAlok

1-Apr-09 18:59

are you talking about single computer or domain?

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: Enumerating users

Eikthrynir2-Apr-09 3:14

Eikthrynir

2-Apr-09 3:14

Single computer.
Anyway, I that NetUserEnum does the job.

IsThemeActive

Dieter Hammer1-Apr-09 1:46

Dieter Hammer

1-Apr-09 1:46

Hi,
I want my ownerdrawn Controls, to look in the correct way.
But if call IsThemeActive() on XP I get always "TRUE", what do I wrong?
The standardcontrols look differen, wheter I have an .exe.manifest or not.
What have I to do, so that my ownerdrawn controls are drawn correctly?

How to get the name of the current .exe of my application within my application

kapardhi1-Apr-09 1:37

kapardhi

1-Apr-09 1:37

Hai!
I have an MFC application. i build it in both release and debug build. it generates an .exe file. Can i get the name of this .exe programmatically.
within my application.
what i actually need is the name of the exe. If it has been renamed manually then i need the changed name

Thanks!

Re: How to get the name of the current .exe of my application within my application

Rajesh R Subramanian1-Apr-09 1:43

Rajesh R Subramanian

1-Apr-09 1:43

See GetModuleFileName()[^]

Usage:

TCHAR szPath[_MAX_PATH];
GetModuleFileName(NULL, szPath, _MAX_PATH);

/* Uncomment the following line if you do not want the path, but only the file name! */
//PathStripPath(szPath);

AfxMessageBox(szPath);

It is a crappy thing, but it's life -^ Carlo Pallini

Re: How to get the name of the current .exe of my application within my application

CPallini1-Apr-09 2:06

CPallini

1-Apr-09 2:06

Hey kid, you're too fast (and actually complete).
Big Grin | :-D

Re: How to get the name of the current .exe of my application within my application

Rajesh R Subramanian1-Apr-09 2:09

Rajesh R Subramanian

1-Apr-09 2:09

Well, you just need a faster internet connection. $Shucks | :-\$

It is a crappy thing, but it's life -^ Carlo Pallini

Re: How to get the name of the current .exe of my application within my application

CPallini1-Apr-09 2:11

CPallini

1-Apr-09 2:11

You're are wrong: I need a faster neuron connection Roll eyes | :rolleyes:

Re: How to get the name of the current .exe of my application within my application

Rajesh R Subramanian1-Apr-09 2:14

Rajesh R Subramanian

1-Apr-09 2:14

Actually, I have ten monkeys (me not included) to assist me search MSDN. Because, I only have paper-printed version. They're like FASSTTT... You know? Big Grin | :-D

It is a crappy thing, but it's life -^ Carlo Pallini

Re: How to get the name of the current .exe of my application within my application

CPallini1-Apr-09 2:37

CPallini

1-Apr-09 2:37