C / C++ / MFC Discussion Boards

CodingLover29-Aug-08 0:59

29-Aug-08 0:59

Hi all,

I have a local pointer variable as follows in a method.

wchar_t * ptr;

Use it for some processing. Once this process, or this method calls number of times it occurs an exception on the following library function

void operator delete(
        void *pUserData
        )

Can someone help me to fix this.

Thanks

I appreciate your help all the time...
CodingLover Smile | :)

Re: How to delete local pointer variable

Roger Stoltz29-Aug-08 1:26

Roger Stoltz

29-Aug-08 1:26

What is the problem?
To me it seems like you're answering your own question...
You ask how to delete a pointer and then show how you are supposed to call the delete operator.

I must be misunderstanding..... Confused | :confused:

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: How to delete local pointer variable

CodingLover29-Aug-08 4:34

CodingLover

29-Aug-08 4:34

I'll try to explain in my best this.

I don't call any delete function. Basically I use that pointer to torkenize a string on a space character.

<br />
	wchar_t spec[] = L" ";<br />
	wchar_t * token;<br />
        token = wcstok("This is the string", spec);<br />

Actually I passes a string through this large number of times. At a random point I got an exception, actually assertion fail, at the above mentioned delete method of a some library.

Hope it's clear.

I appreciate your help all the time...
CodingLover Smile | :)

Re: How to delete local pointer variable

Roger Stoltz29-Aug-08 5:14

Roger Stoltz

29-Aug-08 5:14

CodingLover wrote:
I don't call any delete function.
wchar_t spec[] = L" ";
wchar_t * token;
token = wcstok("This is the string", spec);

None of the pointers above shall be "deleted" as none of them are assigned allocated memory, at least not in the code your providing. The string that would make sense it it was on the heap is the "This is a string"-string, but in the example above it is created on the stack so you must not try to delete it.

If you're not calling delete, who is?

The information you've provided is not enough to help you properly, so I'll make two wild guesses about what could be the problem:
1. You are provided with a pointer to a text string from some library (callback?) and you are "deleting" that pointer, but the library will later try to delete the pointer which generates an assertion.
2. You are passing a temporary pointer to a library which the library tries to delete.
Make sure any of these is not the case.

The bottom line is that you haven't provided enough information and therefore it's not possible to help you.
The code you have posted cannot generate the problem you're describing, so you must have provided something else or omitted some call or return statement. Especially if you're not calling delete.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: How to delete local pointer variable

CodingLover29-Aug-08 6:25

CodingLover

29-Aug-08 6:25

Ok, I'll show my full code to you. It'll help you to give some hint to me.

int WordCharCount(const std::wstring str, int& word_count , int& char_count)
{
	int iSpace = 0;
	int iNull = 0;

	wchar_t temp[1024];
	wchar_t spec[] = L" ";
	wchar_t * token;


	size_t iLength = strMess.copy(temp, str.length(), 0);
	if(iLength > 0) 
	{
		// Word count
		token = wcstok(temp, spec);
		while(token != NULL)
		{
			word_count++;
			token = wcstok(NULL, spec);
		}

		// Character count
		for(size_t i = 0; i < iLength; i++)
		{
			if(isspace(strMess.at(i)) != 0)
			{
				iSpace++; 
			}
		}
		char_count = ((int)iLength - iSpace);
	}

	return 0;
}

I appreciate your help all the time...
CodingLover Smile | :)

Re: How to delete local pointer variable

David Crow29-Aug-08 7:45

David Crow

29-Aug-08 7:45

CodingLover wrote:
It'll help you to give some hint to me.

Not unless you tell us what the function is doing that is incorrect.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: How to delete local pointer variable

CodingLover29-Aug-08 16:29

CodingLover

29-Aug-08 16:29

I'm not clear what you say sir. I try to calculate number of words and characters of a string(actually wstring).

DavidCrow wrote:
Not unless you tell us what the function is doing that is incorrect.

You mean that my function is wrong. It's works sir, only for small strings. For a very large string I go that error.

I appreciate your help all the time...
CodingLover Smile | :)

Re: How to delete local pointer variable

David Crow30-Aug-08 4:17

David Crow

30-Aug-08 4:17

CodingLover wrote:
token = wcstok("This is the string", spec);

Each call to wcstok() modifies the first parameter. Since you passed a string literal as the first argument, it can't be modified.

CodingLover wrote:
...actually assertion fail...

Are you going to tell us what line of what file is asserting?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: How to delete local pointer variable

David Crow29-Aug-08 2:40

David Crow

29-Aug-08 2:40

If ptr no longer points to the address returned by new, then delete will fail.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: How to delete local pointer variable

Hamid_RT29-Aug-08 3:06

Hamid_RT

29-Aug-08 3:06

It seems you got error when you run this line after first time,right?

Re: How to delete local pointer variable

CodingLover29-Aug-08 4:20

CodingLover

29-Aug-08 4:20

Yes, that's what happened.

I appreciate your help all the time...
CodingLover Smile | :)

Re: How to delete local pointer variable

Hamid_RT29-Aug-08 17:52

Hamid_RT

29-Aug-08 17:52

For each new you must be run a delete.

Re: How to delete local pointer variable

CodingLover29-Aug-08 19:09

CodingLover

29-Aug-08 19:09

Yes, that's true. But I didn't do any instantiate with new in my code.

I appreciate your help all the time...
CodingLover Smile | :)

Inserting Dilaog

Deepu Antony29-Aug-08 0:37

Deepu Antony

29-Aug-08 0:37

Hi
I have a dialog based appication project using VC 6.0 having 3 dialogs.

Is that possible to insert one of the dialogs from that project to be inserted in to a new dialog based application project.

So that instead of making new dialog i can use the old dilaog.

Thanks in advance

Re: Inserting Dilaog

Cvaji29-Aug-08 1:39

Cvaji

29-Aug-08 1:39

While inserting a new dialog, .rc and resource.h files are getting updated. So you can done it by merging the .rc/resource.h of the new application with the old one. The thing is you have to merge it carefully

Re: Inserting Dilaog

Deepu Antony29-Aug-08 1:47

Deepu Antony

29-Aug-08 1:47

Thanks for the reply..It was helpful

Re: Inserting Dilaog

Jijo.Raj29-Aug-08 2:37

Jijo.Raj

29-Aug-08 2:37

Assume the two workspaces are Project1 and Project2 respectively. And you want to import dialog from Project1 to Project2.

1) Load project 2 in visual studio.
2) Open the RC file of project1 in visual studio. While opening the file using FileOpen dialog, select "Open as:" option as "Resources".
3) Now open the project1.rc file and you can see the resource tree.
4) Drag the dialog and put it to your resource workspace. The dialog will be automatically added to Project2.
5) Now Copy/paste the .h and .cpp files of corresponding dialogs and add to project2.

Well, in step2 - Selecting "Open as:" option as "Resources" is important.
Now you've imported the dialog from one project to another. Enjoy!!!

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

ClipBoard Read

MsmVc29-Aug-08 0:22

MsmVc

29-Aug-08 0:22

Hi All

I want to read files name from clipboard.Can any one help me..

Re: ClipBoard Read

Perspx29-Aug-08 0:36

Perspx

29-Aug-08 0:36

You'll want to use the GetClipboardData() function with the CF_TEXT format (documentation here).

Regards,
--Perspx

"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia

Introduction to Object-Oriented JavaScript

Re: ClipBoard Read

MsmVc29-Aug-08 0:44

MsmVc

29-Aug-08 0:44

ok i read this artical i want some code.Plz help me

Re: ClipBoard Read

Perspx29-Aug-08 0:50

Perspx

29-Aug-08 0:50

Look at this article - the Pasting Text from the Clipboard section should help.

Regards,
--Perspx

Re: ClipBoard Read

MsmVc29-Aug-08 1:20

MsmVc

29-Aug-08 1:20

Thx's it's help me but I need get copy file name..

Re: ClipBoard Read

Cvaji29-Aug-08 1:50

Cvaji

29-Aug-08 1:50

Use GetClipboardData( CF_HDROP ); instead of CF_TEXT

Re: ClipBoard Read

MsmVc29-Aug-08 22:27

MsmVc

29-Aug-08 22:27

Plz help me

Need help in instantiating abstract class

an8928-Aug-08 23:24

an89

28-Aug-08 23:24

I have an abstract class A which contains pure virtual functions.class B derives from it publicly and B has its own functions which are not virtual.Class C derives from B and calls functions of B .C also implements functions of A.now when I am trying to instantiate C i.e creating object of C its giving error that "cannot declare variable cobj of abstract type A due to pure virtual functions".It is happening only for Linux,in Windows its working fine.Can anybody help pls?

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