Heap Corruption Error Delete

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What Is Heap Corruption C++

about Stack Overflow the company Business Learn more about hiring developers or posting ads heap corruption detected after normal block delete with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack c++ heap corruption detected after normal block Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Heap corruption on delete[] up vote 2 down vote favorite I've been

Crt Detected That The Application Wrote To Memory After End Of Heap Buffer

getting heap corruption error on delete[] instruction. Project is worked on in VC++ 2008, its requirement (so please don't focus on that). Whole building process is working OK, but in run-time I get error: (prs_2013 is name of my project) Windows has triggered a breakpoint in prs_2013.exe. This may be due to a corruption of the heap, which indicates a bug in prs_2013.exe or any of the DLLs it has loaded. This may also be due to the user pressing F12 while prs_2013.exe has focus. The output window may have more diagnostic information. This is code where error occurs, its just a fraction of whole project, but error is confined in this area: // Function used for swapping row of matrix with new values void Main::swap(double* matrix, double* row, unsigned index, unsigned size){ double temp = 0; for(unsigned i = 0; i < size; i++){ temp = matrix[i*size + index]; matrix[i*size + index] = row[i]; row[i] = temp; } } // Function that do some calculations, not really relevant for this problem // but still used in code double Main::determinat(double* matrix, unsigned size){ double ud = 0, du = 0; for(unsigned j = 0; j < size; j++){ double ude = 1, due = 1; for(unsigned i = 0; i < size; i++){ ude *= matrix[i*size + (i+j)%size]; due *= matrix[(size-i)*size + (i + j)%size]; } ud += ude; du += due; } return ud - du; } // Function in which error occurs double* Main::get_x(double* matrix, unsigned size){ // error checking if(size == 1){return NULL;} double *x = new double[size]; x[0] = 1; unsigned const temp_size = size-1; double *temp = new double

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Heap corruption error when deleting array up vote 0 down vote favorite I am attempting to read in a text file containing a list of random numbers and ordering http://stackoverflow.com/questions/16999305/heap-corruption-on-delete them using mergesort to display. The numbers are read in to a dynamic array. Unfortunately, a heap corruption error is detected whenever I attempt to delete arrays that are not in use. Mergesort Function: void mergesort(int *arr, int first, int last) { if(first < last) { int middle = ((first + last)/2); mergesort(arr, first, middle); mergesort(arr, middle+1, last); merge(arr, first, last); } } Error occurs in Merge Function when I delete tempArr: void merge(int *arr, int first, int http://stackoverflow.com/questions/14954996/heap-corruption-error-when-deleting-array last) { int *tempArr = new int[last]; int mid = (first+last)/2; int first1 = first; int last1 = mid; int first2 = mid + 1; int last2 = last; int index = first1; for(; (first1 <= last1) && (first2 <= last2); ++index) { if (arr[first1] < arr[first2]) { tempArr[index] = arr[first1]; ++first1; } else { tempArr[index] = arr[first2]; ++first2; } } for(; first1 <= last1; ++first1, ++index) tempArr[index] = arr[first1]; for(; first2 <= last2; ++first2, ++index) tempArr[index] = arr[first2]; for(index=first;index<=last;++index) arr[index] = tempArr[index]; delete [] tempArr; } c++ mergesort dynamic-arrays share|improve this question edited Feb 20 '13 at 3:00 asked Feb 19 '13 at 10:17 sdrx1700 275 1 Besides the use of new, delete and the streams, I wouldn't call that C++. Use references instead of pointers to pass arguments "by reference", and use std::vector instead of raw arrays. –Joachim Pileborg Feb 19 '13 at 10:23 3 As for your problem, run it in a debugger, and step through the code line by line while making sure you do not overwrite the end of the arrays. –Joachim Pileborg Feb 19 '13 at 10:24 1 Note that (first+last)/2 can overflow - first + (last - first)/2 is safer. –molbdnilo Feb 19 '13 at 10:30 Thanks for the responses, it turns out that changing '(first+last)/2' to 'first + (last - first)/2' solved the heap corruption error. However, my

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Studio Languages , Windows Desktop Development > C++ Standards, Extensions, and Interop Question 0 Sign in to vote I have a loop where I read strings from a ListBox and place them in a char* allocated with new (or GlobalAlloc()). I am sure that the size of NameLen is large enough, and my problem is that I have no way of freeing strName without causing an error (such as BLOCK_TYPE_IS_VALID or HEAP CORRUPTION DETECTED). Allocating with GlobalAlloc() is no problem, but then again, at GlobalFree() the application crashes. strName = new char[NameLen+1]; //strName = (char*)GlobalAlloc(GPTR, NameLen+1); SendMessage(hListBox, LB_GETTEXT, 0, (LPARAM)strName); strName[NameLen+1] = '\0'; //delete strName; //delete[] strName; //GlobalFree(HANDLE(strName)); Without freeing strName I have a leak, but the program fails if I uncomment anything. I would also like to point out that GlobalAlloc()/GlobalFree() worked without any trouble compiling with mingw/gcc I'm using VC++ 2008 Express edition. How do I correct my code? Wednesday, January 27, 2010 12:22 PM Reply | Quote Answers 2 Sign in to vote Jonatan.S wrote:> strName = new char[NameLen+1]; Valid indexes into strName array are 0 through NameLen inclusive. > strName[NameLen+1] = '\0'; ... but here you are writing to index NameLen+1, beyond the end of the buffer. You have a buffer overrun.-- Igor Tandetnik Proposed as answer by Nikita Leontiev Wednesday, January 27, 2010 3:57 PM Marked as answer by Nancy Shao Wednesday, February 03, 2010 3:17 AM Wednesday, January 27, 2010 12:48 PM Reply | Quote 2 Sign in to vote As an additon to the above, when using the debug heap (which is always true with a debugger attached.) Then the memory allocation/deallocation does extra checking. First it overallocates memory, fills the memory which you asked for with one bit pattern, and the memory outside of what y