deletion of void pointer - C / C++ / MFC Discussion Boards

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Re: check box problem

Hamid_RT28-Jan-08 2:01

Hamid_RT

28-Jan-08 2:01

For use it you must use of SendMessage with handle of your control.

Re: check box problem

Mark Salsbery28-Jan-08 7:02

Mark Salsbery

28-Jan-08 7:02

case WM_COMMAND:
   if(LOWORD(wParam) == IDC_CHECKBOX1)
   {
      LRESULT ret = ::SendMessage((HWND)lParam, BM_GETCHECK, 0, 0);
   
      if (BST_CHECKED == ret)
      {
      }
      else if (BST_INDETERMINATE == ret)
      {
      }
      else  // must be BST_UNCHECKED
      {
      }
   }

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

VC++&Fortran mixed-language string problem

raulisme27-Jan-08 19:37

raulisme

27-Jan-08 19:37

I don't know how to up-load the attachment,so I just put a link here:
http://softwarecommunity.intel.com/isn/Community/en-US/forums/thread/30247874.aspx[^]

I've already banged my head against the keyboard several times, I hope some guys here can fix my problem, any help will be appreciated.

Re: VC++&Fortran mixed-language string problem

Iain Clarke, Warrior Programmer27-Jan-08 21:54

Iain Clarke, Warrior Programmer

27-Jan-08 21:54

You could at least summarise the problem, so that people will know if their skills are good enough to spend their valuable time helping you instead of swearing at each other in the soapbox.

I look at these forums in gaps of a few minutes while some large compilations happen - I'm not going to start following links off site in case I may be able to help. And I'm sure that's true for a lot of the more regular helpers.

We're nice - but you need to help us to help you.

Iain.

Very well said!

jhwurmbach27-Jan-08 22:04

jhwurmbach

27-Jan-08 22:04

The only thing I do not understand: What is wrong with swearing at each other in the soapbox? Poke tongue | ;-P

Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
Douglas Adams, "Dirk Gently's Holistic Detective Agency"

Re: Very well said!

Maxwell Chen27-Jan-08 22:10

Maxwell Chen

27-Jan-08 22:10

jhwurmbach wrote:
What is wrong with swearing at each other in the soapbox?

The lid of the soapbox is broken, so falling into the box hurts! Poke tongue | ;-P

Maxwell Chen

Re: Very well said!

Iain Clarke, Warrior Programmer27-Jan-08 22:18

Iain Clarke, Warrior Programmer

27-Jan-08 22:18

jhwurmbach wrote:
What is wrong with swearing at each other in the soapbox?

Nothing at all. That's why time away from it has to be justified!

(OK, I lurk in the lounge, but stil...)

Iain.

deletion of void pointer

Member 310062427-Jan-08 19:36

Member 3100624

27-Jan-08 19:36

Consider the following code:

XYZ* pXYZ = new XYZ();
void* pvoid = pXYZ;
delete pvoid;

my question is whether the XYZ object will be properly deleted thru the pvoid pointer WITHOUT typecasting? If the answer is no, then how does the 'free' delete using void pointers without knowing the amount of blocks that are to be freed?

werwr

Re: deletion of void pointer

Nibu babu thomas27-Jan-08 21:18

Nibu babu thomas

27-Jan-08 21:18

Member 3100624 wrote:
my question is whether the XYZ object will be properly deleted thru the pvoid pointer WITHOUT typecasting? If the answer is no, then how does the 'free' delete using void pointers without knowing the amount of blocks that are to be freed?

Well the pointer will be deleted but not properly. The reason being that deleting a void pointer won't call that pointer's destructor function which will result in leaks if you have nested objects which in turn allocate memory.

Always pair "new" and "delete". Don't try to "new" and then use "free". "new" calls the constructor and "delete" calls the destructor. This allows all nested objects(which relies on the container class's destructor) to free themselves properly.

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Re: deletion of void pointer

Iain Clarke, Warrior Programmer27-Jan-08 22:22

Iain Clarke, Warrior Programmer

27-Jan-08 22:22

Well answered. So well answered, that I tried to look at your blog. The link in your sig points to...

http://www.codeproject.com/script/Forums/%5C%5Cnibuthomas.wordpress.com[^]

Which you may want to change! I'm guessing changing /'s to \'s will help.

(And yes, I can edit the link I go to - may be that's a test to qualify for entry to your blog?)

Iain.

Re: deletion of void pointer

Nibu babu thomas27-Jan-08 23:44

Nibu babu thomas

27-Jan-08 23:44

Iain Clarke wrote:
Which you may want to change! I'm guessing changing /'s to \'s will help.

Worked for me, but anyway changed as you said, thanks! Smile | :)

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: deletion of void pointer

Iain Clarke, Warrior Programmer28-Jan-08 0:05

Iain Clarke, Warrior Programmer

28-Jan-08 0:05

It's better now. Maybe it's a firefox thing? IExplore was being friendler about the /\'s?

Iain.

Doubt!!!!

rowdy_vc++27-Jan-08 19:17

rowdy_vc++

27-Jan-08 19:17

Hi All..Thanks for your replay..

i have the total file length like this only .i wanna create the serial no this total length of the file how its possible ..

Lfile.Write("",Lfile.GetLength());

Lfile is nothing but object of CFile.This Lfile contains some list of datas.

Thanks!!

raju.k

Re: Doubt!!!!

Hamid_RT27-Jan-08 20:50

Hamid_RT

27-Jan-08 20:50

Do you want serial for files like (1) (2),...?

Re: Doubt!!!!

rowdy_vc++27-Jan-08 22:17

rowdy_vc++

27-Jan-08 22:17

hi hamid...thanks for ur replay

like this only..

1.
2.
3.
4.
etc

Thanks

raju.k

Re: Doubt!!!!

vijay_aroli27-Jan-08 22:31

vijay_aroli

27-Jan-08 22:31

Why have you created a new thread for asking something that you have asked in one of your earlier posts? There are some people trying to help you there and so I advice you to be patient and wait for someone to answer your question.

Don't expect that making a repost of the your questions by creating a new thread will get you answers quickly. If people have not been able to help you in the original thread, then its unlikely that they will answer here.

And seriously, though you have asked the question twice, i am still not able to figure out what you exactly want.

Regards,
Vijay.

Re: Doubt!!!!

Maxwell Chen27-Jan-08 22:36

Maxwell Chen

27-Jan-08 22:36

vijay7173 wrote:
And seriously, though you have asked the question twice, i am still not able to figure out what you exactly want.

Me too!

Maxwell Chen

Re: Doubt!!!!

vijay_aroli27-Jan-08 22:51

vijay_aroli

27-Jan-08 22:51

Maxwell Chen wrote:
Me too!

well, I read your replies to the original post and I should say that you tried your best to help him. Smile | :)

Regards,
Vijay.

Re: Doubt!!!!

rowdy_vc++27-Jan-08 23:21

rowdy_vc++

27-Jan-08 23:21

hi vijay and all ..i read ur replay and i understood ..in feature i follow surely..i am new in this filed like VC++ ,code project also...

my question is ..

how to create serial no in a file ?
the output of file like this only..

1.
2.
3.

Thanks

raju.k

Re: Doubt!!!!

David Crow28-Jan-08 6:21

David Crow

28-Jan-08 6:21

raju.k wrote:
how to create serial no in a file ?

Several ways exist. One such way is:

FILE *pFile = fopen(..., "w");
fprintf(pFile,  "1.\n");
fprintf(pFile,  "%d.\n", 2);
int x = 3;
fprintf(pFile,  "%d.\n", x);
fclose(pFile);

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Drag image on to the explorer

revanth198527-Jan-08 19:07

revanth1985

27-Jan-08 19:07

Hi,
I have a treecontrol containing files and folders as it items.Now i have added drag and drop support to and from explorer to my tree control.Everything is working fine but,when i drag a item from tree control i have created a drag image and assigned it to a pointer variable of CImageList class and using it i have dragged the image during drag.It works well inside the view but whrn the cursor leaves the the view it is getting struct at the border of the view.How can i move the image on to the explorer.I have registered my view as a droptarget.

Thanks

Re: Drag image on to the explorer

Hamid_RT27-Jan-08 20:49

Hamid_RT

27-Jan-08 20:49

I think codeproject has an example about drag to Explorer did you see it?

Re: Drag image on to the explorer [modified]

revanth198527-Jan-08 23:52

revanth1985

27-Jan-08 23:52

I am able to drag but image is getting struck at the end of the view.I have reffered Micheal dunn's example.

Thanks

modified on Monday, January 28, 2008 7:14:26 AM

Uncaught exception

George_George27-Jan-08 19:01

George_George

27-Jan-08 19:01

Hello everyone,

Just want to check whether my understanding is correct,

Both (1) and (2) only covers Windows C++ platform.

1. If there is uncaught exception, destructor is not ensured to be called for active object;

2. All the resources (handles, memory, etc.) for current process will be released when uncaught exception causing process to terminate.

thanks in advance,
George

Re: Uncaught exception

Maxwell Chen27-Jan-08 19:31

Maxwell Chen

27-Jan-08 19:31

For this kind of questions, you can test by yourself with DebugView tool.

Maxwell Chen

Last Visit: 31-Dec-99 18:00 Last Update: 21-Jun-24 14:29

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