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Debug Error Damage After Null Block

Forum New Posts FAQ Calendar Forum Actions Mark Forums Read Quick Links Today's Posts View Site Leaders What's New? c++ 2 70 345d c++ vs2003 treeview and adding a save to a text file causing errors 8 61 325d Finding a good hash function 4 107 317d Modify static variables What more do you want? 0 LVL 32 Overall: Level 32 C++ 10 Message Expert Comment by:jhance2000-11-02 >>I try using NuMega BoundsChecker to debug, it crashes at the point in When you use these features the error message you get will indicate the source code location where the block of memory was allcoated. this contact form

Try commenting out all your othercode (the ... DAMAGE: after (null) block (#16) at 0x00661C1C. Guess its when I'm using the delete [] str but can't trace the error. All the buzzt CornedBee "Writing specifications is like writing a novel. https://www.gidforums.com/t-17789.html

That can help tremendously in tracking down this error. You were spot on. Debugging by Windbg with GFlags enabled: Refer my answer to similar question here share|improve this answer answered Apr 27 '09 at 15:12 aJ. 20.7k1564105 Please refer to my comment

Reply With Quote Quick Navigation C and C++ Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Visual Basic Visual Basic .NET VB.net CodeBank Visual Basic Reply With Quote Jan 9th, 2007,08:33 AM #4 penagate View Profile View Forum Posts Lurker Join Date Jan 2005 Location Everywhere Posts 13,651 Re: a strange error : DAMAGE: after Normal Nov 14 '05 #5 P: n/a Gordon Burditt >> if (ProgramName == NULL) { PrintErrMsg (errno);This is kind of silly, since errno is a global variable anyway. Unless you really want to see the output shown in the "disassembly" window which gives me a headache tracing through the calls.

Before you start calling its developer an idiot, be sure you have read and followed the instructions. 0 LVL 1 Overall: Level 1 Message Expert Comment by:sridhara_us2000-11-02 check what the String & String::operator+(const String & st) { str = strcat (str, st.str); len = strlen(str); return *this; } Hope that helps. Please do let me know your views ... https://www.experts-exchange.com/questions/11733400/Debug-ERROR-Damage-after-normal-block.html For example.

Let's do the Wave! You want if (ProgramName != NULL) { free (ProgramName); #if 0 ProgramName = NULL; #endif PrintErrMsg (errno); } } By the way: You don't need to copy argv[0] at all, since This bug results not only in   * *        an incomplete display of birthdays, but also in a      * *        memory leak. How do you expect to get any help if you won't provide any details. 0 LVL 1 Overall: Level 1 Message Expert Comment by:sridhara_us2000-11-03 You might consider an important possibility--

The returned data is not null terminated,so if you useany string functions to process the data those functionswill corruptthe memory beyond.The error does not appear in the release build becauseonly the http://stackoverflow.com/questions/793375/what-could-cause-damage-after-normal-block-error However, errno might not be a global variable, it could be a macro that expands to a modifiable lvalue :-) -- Flash Gordon Pedantic to the last, except I sometimes get Get 1:1 Help Now Advertise Here Enjoyed your answer? Damage: after normal block Posted on 2000-11-01 C++ 1 Verified Solution 34 Comments 729 Views Last Modified: 2008-02-01 I have been debugging the following error for 2 days in futile.

Which line produces the error? weblink You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t… C++ Introduction to C++: Functions - Passing by Value vs NULL : ProgramName); This is equivalent to return ProgramName; } void ClearMemory () { if (strlen (ProgramName) > 0) This is not the way to test whether the string allocation was I see that a lot inside kernels.

Thanx again you have been very helpful indeed. What if you did this, however?: memset(p, 1, 5); You'd get: XX11111X Notice that one of the buffer bytes at the end of the buffer has been written. its not a standard function. navigate here CONTINUE READING Suggested Solutions Title # Comments Views Activity c++ TreeView with Columns down loadable project to learn on 6 50 329d Finding a good hash function 4 107 317d Rijndael

NULL : ProgramName); } void ClearMemory () { if (strlen (ProgramName) > 0) { free (ProgramName); #if 0 ProgramName = NULL; #endif PrintErrMsg (errno); } } void PrintErrMsg (size_t ErrNumber) { Debug Error: DAMAGE: After Normal Block (#xxx) at 0xxxxxxxx.... Posts 11,594 Re: a strange error : DAMAGE: after Normal Block (#56) at 0x00411300 The error means that the guard regions of the allocation system have been altered, so you most

It's really strange.For example, when I assign head to temp: temp = head; then I move head to the next node : head = head->next after that i free temp :

How can I even debug this ? Subscribe to our monthly newsletter for tech news and trends Membership How it Works Gigs Live Careers Plans and Pricing For Business Become an Expert Resource Center About Us Who We Dumping objects -> C:\DEV\EXAMPLE2.C(338) : {18} client block at 0x00661CB4, subtype 0, 36 bytes long:   The birthday of Thomas Carlyle is 12/16/1770. Does malloc add size information to program?

But are you tallijg jhance to work the program? As a first stab What's the last character in a file? hoping ur response. :D Feb 21, 2010 at 10:53am UTC guestgulkan (2942) OK I assume that you changed it to this: ITEM* temp = (ITEM*)malloc(sizeof(ITEM)) ; This bit doesn't look right http://completeprogrammer.net/debug-error/debug-error-damage-after-the-normal-block.html If there is no other solution, can I propose a , until more info are available.

Reply With Quote December 8th, 2005,09:57 AM #3 wuhoo View Profile View Forum Posts Member Join Date Apr 2004 Posts 172 Re: Debug Error: Damage after normal block http://msdn.microsoft.com/library/de...m/funct_19.asp you can The field should    * *        be larger, and strncpy( ) should be used in place of   * *        strcpy( ). For information about how memory blocks are allocated, initialized, and managed in the debug version of the base heap, see Memory Management and the Debug Heap. At what point in the loop does integer overflow become undefined behavior?

Since this is a 3rd party function you obviously can't step into it but what are you expecting back out of it? Bot… Programming Languages-Other C++ Introduction to C++: Vectors - Additional Member Functions Video by: Ian The viewer will learn additional member functions of the vector class. Dumping objects -> C:\DEV\EXAMPLE2.C(338) : {18} client block at 0x00661CB4, subtype 0, 36 bytes long:   The birthday of Thomas Carlyle is 12/16/1770.