Re: freeing a char * in Ansi C - C / C++ / MFC Discussion Boards

Re: Getting message map for dynamic controls

Nitron14-Apr-04 5:57

14-Apr-04 5:57

Well, I'm not using a form, I'm putting the control in a CView. I decided to throw together a junk project and use it to do like you suggested, but I still have to copy/paste in all the wiring. Oh well... Sigh | :sigh:

~Nitron.

ññòòïðïðB A start

Re: Getting message map for dynamic controls

PJ Arends14-Apr-04 6:04

PJ Arends

14-Apr-04 6:04

yeah, sometimes life can be a bee with an itch.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: freeing a char * in Ansi C

Tim Smith14-Apr-04 3:56

Tim Smith

14-Apr-04 3:56

Where do you allocate the space for nomarchc?

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: freeing a char * in Ansi C

John M. Drescher14-Apr-04 4:27

John M. Drescher

14-Apr-04 4:27

Yes this code will not even compile. I assume name is incorrect.

John

Re: freeing a char * in Ansi C

kfaday14-Apr-04 4:36

kfaday

14-Apr-04 4:36

sorry
it was wrong i edited it and it still gives me an error

Re: freeing a char * in Ansi C

toxcct14-Apr-04 4:18

toxcct

14-Apr-04 4:18

don't the following work ?

<font style="color:blue;">#include</font> <stdio.h>     <font style="color:green;">// printf(), scantf()</font>
<font style="color:blue;">#include</font> <stdlib.h>    <font style="color:green;">// malloc(), free()</font>
<font style="color:blue;">#define</font> MAX_WORD 51
 
<font style="color:blue;">int</font> main (<font style="color:blue;">void</font>) {
    <font style="color:blue;">char</font> nomarchc[MAX_WORD]; 
 
    printf(<font style="color:gray;">"insert file name:"</font>);
    scanf(<font style="color:gray;">"%50s"</font>, nomarchc);
 
    return 0;
}

your problem with free() can come from your

name=(char*)malloc((sizeof(char))*MAX_WORD);<br />

line, where you allocate a memory area, but you store it into name instead of nomarch...

TOXCCT >>> GEII power

Re: freeing a char * in Ansi C

Prakash Nadar14-Apr-04 4:42

Prakash Nadar

14-Apr-04 4:42

one problem that i can see is that if you type more than MAX_WORD i.e 51 chars it will give problem. free will cry.

Re: freeing a char * in Ansi C

Paul Ranson14-Apr-04 4:48

Paul Ranson

14-Apr-04 4:48

Your code as written seems to work as intended. So I'm not sure what your problem is unless you're walking over the end of the buffer. It would be better to write your scanf line thus,

scanf ( "%h50s", nomarchc ) ;

Where the width specifier is always one less than the size of the allocated buffer to allow for the trailing null.

Paul

Re: freeing a char * in Ansi C

kfaday14-Apr-04 4:54

kfaday

14-Apr-04 4:54

i solved the problem
thanks
it was an overflow problem
i wrote more than 50 positions

Application Error !

Anonymous14-Apr-04 3:11

Anonymous

14-Apr-04 3:11

I have this kind of error when I use the application I work on. No error at compilation but this error appears when I use one the functionality:

"The instruction at "0x01604f3d" uses the memory address "0x0000030a". The memory can't be "read" "

Can you help me ?

Re: Application Error !

Cedric Moonen14-Apr-04 3:20

Cedric Moonen

14-Apr-04 3:20

Launch your application with the debugger (F5) and see where it crashes)

Re: Application Error !

Anonymous14-Apr-04 3:30

Anonymous

14-Apr-04 3:30

I've done it...
And when I put a breakpoint where it crashes, there is no error !
It's incredible but I have no idea on this subject

Re: Application Error !

Maximilien14-Apr-04 3:53

Maximilien

14-Apr-04 3:53

basic stuff to check : variables initialisation, error checking on memory allocations, ....

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Application Error !

Nitron14-Apr-04 4:37

Nitron

14-Apr-04 4:37

Make sure you're not trying to access an element of an array beyond the array's bounds. If you're using vector, put in a catch/try block and see if it's throwing an exception somewhere. Look carefully and triple-check any hand-written for or do/while loops.

~Nitron.

ññòòïðïðB A start

VS 6.0 or VS 7.0??

Demian Panello14-Apr-04 3:10

Demian Panello

14-Apr-04 3:10

Hi.

I like to know if there are some kind of advantages in VS 7.0 if I write application with just MFC and Win32 SDK.
If there are, wich are? Just a few examples.

Thanks.

Demian.

Re: VS 6.0 or VS 7.0??

David Crow14-Apr-04 3:33

David Crow

14-Apr-04 3:33

While it doesn't directly answer your question, I'd like to offer this. Don't buy the latest version of something just because it is the latest version. Like any tool, a compiler is meant to solve a problem. Each problem has a set of requirements. If the compiler can meet each of those requirements, then that's the tool for the job. While the newer versions of Visual C++ have more bells and whistles than older versions, you have to ask yourself if those bells are whistles are "wants" or "needs."

For the past 11 years, my work has been solely governed by the clients for which we sell to. I don't have an exact date, but it was many years after Windows 95 was released, our clients were still using 16-bit Windows. The developers, myself included, were in agony because we could not update our development tools. When clients started buying new computers that came with Windows 98 pre-installed, only then did we get the go-ahead to buy and use Visual C++ v5.

Even today, I have no business reason to use anything other than Visual C++ v6. The clients that use our software are mostly Windows 98 and Windows 2000. I'm sure a handful of them are probably using Windows XP. But the biggest factor is that the EXE that our DLL hooks up with is still being compiled (by IBM) with Visual C++ v5. They might be using v6, but I can't say for sure. Any new development that they do, however, is in Java.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: VS 6.0 or VS 7.0??

Demian Panello14-Apr-04 4:06

Demian Panello

14-Apr-04 4:06

Yes, that's totally true. I understand what you say.

I thought about substantial changes or advantages, por example in serialization, maybe is more simple or diferent, I don't know, something like that.
Because I'm going to developed a new application and maybe the serialization process is better or easy in VS 7.0.

Well, thank you very much.

Regards from Argentina.

Demian.

Re: VS 6.0 or VS 7.0??

basementman14-Apr-04 4:16

basementman

14-Apr-04 4:16

Well said, David! Big Grin | :-D

I have both VC7.1 and VC 6 and for some reason, I keep going back to VC6. Call it comfort, call it habit, it just plain works. And if it ain't broke....

onwards and upwards...

Re: VS 6.0 or VS 7.0??

_moved14-Apr-04 3:57

_moved

14-Apr-04 3:57

i would say there is not a lot of difference.
Some debugger and code editor advantages,
VB like UI. I think if you have 6 there is no reason to buy 7

Re: VS 6.0 or VS 7.0??

Tim Smith14-Apr-04 3:59

Tim Smith

14-Apr-04 3:59

VS7.1

VC6 doesn't really support the C++ standard very well. VS7.1 does a very good job of this.

VS7.1 fixes a lot of the problems with the 7.0 IDE which is what a LOT of people whine about. At BioWare and my previous job, we are all switching to VS7.x.

It would be a mistake this late in the game to use VS6.0 for a new project. The lack of support might be an issue.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

CListView

packetlos14-Apr-04 2:27

packetlos

14-Apr-04 2:27

Hi just a quickie,

I have 2 views in my application which are split, a ListView and a TreeView, when the selection in the listview changes the treeview updates, when this happens the LitsView looses focus and the selection highlight disapears, is there any way to retain this?

Cheers

Packetlos

Re: CListView

David Crow14-Apr-04 2:32

David Crow

14-Apr-04 2:32