Sinhronisation of allocation and freeing of memory - C / C++ / MFC Discussion Boards

neha_rai21-Jul-09 10:43

21-Jul-09 10:43

i have implemented the dfs algo in c++ using recursion but i wish to find all routes from source to destination. any good article or guidelines will helpful..i wish to do it using a link list if possible..!!!

Re: depth first search help..

«_Superman_»21-Jul-09 18:18

«_Superman_»

21-Jul-09 18:18

This entry from wikipedia will probably help you - Depth-first search[^]
It has a python implementation with and without recursion.

«_Superman_»
I love work. It gives me something to do between weekends.

Wierd compiler bug with the string "??!" please someone tell me im not going mental!

swifty666_200021-Jul-09 10:00

swifty666_2000

21-Jul-09 10:00

Ok so i was testing my chat system by outputting some random messages which i had typed into the code, and i came across this very strange occurance..

I recreated the error with an extremely small command prompt program:-

#include <iostream>
using namespace std;


void main()
{
	//Print some characters
	printf("\n");
	printf("!!!!\n");
	printf("????\n");
	
	//Print "??!" 
	printf("??!\n\n");
	//... but wait.. it printed a '|'

	//Let's try that again..
	printf("Why is this:- |\n\n");
	printf("Also here -> ??! <-\n");
	printf("\n");
	//Is this just me?

	//Now uncomment this code :-

	/*
	const char wierdness1[2] = "??!";//This is not a bounds overflow!!!
	printf(wierdness1);
	const char wierdness2[2] = "123";//But rightly, this is. It's a compiler bug??
	*/

	getchar();
}

I swear to god this is not a wind up, it took me ages to find out why a | was appearing where i had typed "??!". Can someone please compile this program and tell me if you get the same thing happening. Im using Visual Studio 2008

Thanks,
Leigh

Re: Wierd compiler bug with the string "??!" please someone tell me im not going mental!

David Crow21-Jul-09 10:21

David Crow

21-Jul-09 10:21

swifty666_2000 wrote:
I swear to god this is not a wind up, it took me ages to find out why a | was appearing where i had typed "??!".

Search for trigraph.

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

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Re: Wierd compiler bug with the string "??!" please someone tell me im not going mental!

swifty666_200021-Jul-09 10:28

swifty666_2000

21-Jul-09 10:28

Oh wow. I've never heard of that before Blush | :O

).

What are they for though? Or is it just some legacy thing?

Thanks very much!

Re: Wierd compiler bug with the string "??!" please someone tell me im not going mental!

David Crow21-Jul-09 10:31

David Crow

21-Jul-09 10:31

swifty666_2000 wrote:
What are they for though?

Trigraphs, sequences of three characters (introduced by two consecutive question marks), allow C programs to be written using only the ISO Invariant Code Set. You can use them in C source files with a character set that does not contain convenient graphic representations for some punctuation characters.

Re: Wierd compiler bug with the string "??!" please someone tell me im not going mental!

Pops800221-Jul-09 19:12

Pops8002

21-Jul-09 19:12

refer to this link
http://www.reference.com/browse/wiki/C_trigraph[^]

Sinhronisation of allocation and freeing of memory

Gastello21-Jul-09 6:55

Gastello

21-Jul-09 6:55

I've got a problem with sinhronisation of a function which is called from several threads. The function do no use static variables. And there is no connection variables between threads. In debuger the aplication crashes on new or delete operators inside the function. In internet I've read that these operators are already synhronized. Please help me to find solution of the problem.

Re: Sinhronisation of allocation and freeing of memory

Stuart Dootson21-Jul-09 11:17

Stuart Dootson

21-Jul-09 11:17

Are you using a multi-threaded variant of the C runtime?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Sinhronisation of allocation and freeing of memory

Gastello22-Jul-09 1:23

Gastello

22-Jul-09 1:23

I am not realy know what you mean with "multi-threaded variant of the C runtime"? If this is project settings in VC6.0 on page "Code generation", I have for "Use run-time library" defined "Debug Multithreaded DLL" and "Multithreaded DLL" for realize. If I am wrong please tell me in detail what did you mean.

Re: Sinhronisation of allocation and freeing of memory

Stuart Dootson22-Jul-09 2:01

Stuart Dootson

22-Jul-09 2:01

That's what I meant - so it's obviously not that that's your problem...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Sinhronisation of allocation and freeing of memory

Gastello27-Jul-09 0:29

Gastello

27-Jul-09 0:29

I found the problem, there was "static" variables inside functions.

Details of Error Message in MSIPackageDiff

Member 154408721-Jul-09 5:18

Member 1544087

21-Jul-09 5:18

Hi,

I have built 2 MSI with same configuration. Just rebuilded. When I am comparing those 2 MSIs using MSIPackageDiff, I am getting some of the error in Binary Table.
Can someone explain me what are these changes?

Thanks & Regards,
Swapnil D. Lokhande

How to trace MFC command? SOLVED

Vaclav_21-Jul-09 5:10

Vaclav_

21-Jul-09 5:10

Can someone please direct me to a source of information on how to trace / debug standard MFC commands. For example File.. Save.. I am using "MFC Internals" for a guide but cannot see how to debug the command message flow.
Thanks for reading
Cheers Vaclav

Update
I have overridden OnCommand in main and MDI frame and can trace the command flow from the main menu to the MDI OnCommand. Now how do I get / step into base class? F11 does not respond.

modified on Tuesday, July 21, 2009 4:07 PM

Re: How to trace MFC command?

led mike21-Jul-09 5:57

led mike

21-Jul-09 5:57

See if this MSDN article on Command Routing [^]helps

Re: How to trace MFC command?

Vaclav_21-Jul-09 7:22

Vaclav_

21-Jul-09 7:22

Thanks Mike,
The article does confirm what I got from the book. What I am still missing is how to get to the base class using debug steps.
I must be missing some options in my VC 6.0 because F11 just does not do anything visible and the program is stuck in last debug point. I will try just source code of the MFC base class next.

Vaclav

Re: How to trace MFC command?

Maximilien21-Jul-09 8:50

Maximilien

21-Jul-09 8:50

Up to a point, I think at the Win32 level, there is no more visible "code" to step into.

This signature was proudly tested on animals.

Re: How to trace MFC command?

Vaclav_21-Jul-09 10:07

Vaclav_

21-Jul-09 10:07

After raking a short brake from coding I came to the same conclusion.
It always amazes me how taking breaks from many “problems” gives person a different outlook on things. Was that covered in some famous book?
Thanks for your help.
Vaclav

Feature Pack 2008?

Software200721-Jul-09 4:52

Software2007

21-Jul-09 4:52

I would like to use the CMFCtoolBars to replace CToolBars, so I am guessing I need to integrate the Feature Pack to my MFC application. Do I have to change all the base classes(CStatusBar, CWinApp...etc) to those from the feature pack if I only wanted to change the CToolbar, or can I change CToolBar only and still get it to work?

Thanks

Re: Feature Pack 2008?

Maximilien21-Jul-09 5:50

Maximilien

21-Jul-09 5:50

I think you can just "plug'n'play".

This signature was proudly tested on animals.

Number of interactive logged on users on Windows Vista

Eikthrynir21-Jul-09 3:18

Eikthrynir

21-Jul-09 3:18

I created a test application using LsaEnumerateLogonSessions and LsaGetLogonSessionData, which displays the number of interactive logged on users. It works fine on Windows XP, but it displays 2 interactive logged on users on Windows Vista, even though I have only one user: the Administrator.

Can anyone tell me why this happens?

Thanks!

Re: Number of interactive logged on users on Windows Vista

David Crow21-Jul-09 4:17

David Crow

21-Jul-09 4:17

Eikthrynir wrote:
...but it displays 2 interactive logged on users on Windows Vista, even though I have only one user: the Administrator.

Is the other a legitimate user, just not logged on?

Re: Number of interactive logged on users on Windows Vista

Eikthrynir21-Jul-09 4:34

Eikthrynir

21-Jul-09 4:34

I modified the application so that it displays also the user name. It's the same user...

Re: Number of interactive logged on users on Windows Vista

Eikthrynir21-Jul-09 4:40

Eikthrynir

21-Jul-09 4:40

The LogonId data members are different, even though the UserName data member are the same...

Re: Number of interactive logged on users on Windows Vista

David Crow21-Jul-09 4:43

David Crow

21-Jul-09 4:43

So it's showing Administrator twice? When I use that function on XP, it returns 6 sessions, even though I am the only one logged on to my machine. I don't have access to a Vista machine to see how it behaves.

What do NetWkstaUserEnum() and WTSEnumerateSessions() return?

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