[memory-management] Forum Topics

Is there any diference between: [code] X* x = new X; X* y = operator new X; [/code]

An exercise is to write a program that shows how memory is allocated to stack variables compared to heap variables. I ran the following code. [code] #include "../../std_lib_facilities.h" int main () { char c = ' '; char ch0[10]; char *ch = new char[10]; char *init_ch = ch; cout << …

I'm attempting to solve this for myself as this is homework but I can't get past the hurdle. I have an array that dynamically holds the pixels of an image (chars) in its second dimension (first being the image number). I first initialize my array variable... [CODE] unsigned char** imgSet; …

This is a follow-up exercise to the one related to reference and dereference operators. Stroustrup asks the reader to modify that program to handle an array overflow. He wants us to specifically use the realloc() function. I read the tutorial here but didn't understand the example. I read other web …

An exercise in Stroupstrup's book is to write a program involving memory allocation with an infinite loop and let it run until it crashes. He says the crash will be due to [i]memory exhaustion[/i]. He also suggests researching the topic. I did and am frightened by what I found. The …

I'm having some problems finding memory management errors in this code. The only one I see as a possible error is the deleting the dereferenced pointer, but I'm not even sure if thats correct. Some of the errors should include memory leaks, memory deletion when still in use, two objects …

I'm implementing an application that should decide whether to move computations to external memory, depending on RAM memory consumption. Is there a C++ function that computes my maximal RAM memory capacity, and the amount of currently consumed portion (in MB, perhaps). Any other suggestions on how to obtain these values …

Hello everyone, I currently have an application that reads in an entire excel file then iterates through the records from the file and queries our database for a match. If a match is found the record is ignored if a match is not found the record gets added to the …

Hi, Is it possible to allocate memory using malloc() (C) and release it using delete (C++) or even the opposite Alocate with new (C++) and release with free() (C) If not Why?

// find new size nNewArraySize = StrNewSizeForCharReplace(pszString, pszFindString, pszReplaceString); // nNewArry size is 1063 // alllocate memory pszTemp= (unsigned char*)malloc(nNewArraySize + 1); // add 1063 character in to pszTEmp // 1063 nLength = strlen(pszTEmp) // length is 1063 free(pszTemp); // Heap memory exception How can remove this exception

what is Scheduling? what is Memory Partitioning, Paging, Segmentation? What is Network Topologies and types.

I've made a Circular List and I need help implementing a simple memory management. It's the first time I'm doing this so I really have no idea where to start. What I want to do is pre-allocate X amount of Nodes that I can use for my list. Only when …

In answer to a coworker's question today about memory management today, I wrote the following code. It's an implementation of the gets function that accepts an infinite length string (bounded only by the heap) and [i]does not[/i] force the caller to free the resulting pointer. I figure that it's a …

I just coded a program and now I need to draw a memory map of the results. that shows the address of each variable. Can someone explain to me how to do this with the following code... [CODE] #include <iostream> using namespace std; //int main function int main () { …

Hi, I would like to know how to free a memory after I am using a imagelist or picturebox/ image file. I have a program who loads picturebox into a imagelist, only 2 pictures at the time. My problem is, after running my program several times (by using "start" command …

I am a little unclear on what is happening here and if it's even necessary. [code] ICOMInterface** pICOMInterface = new ICOMInterface*[reserve]; for(SIZE_T i = 0; i < required; i++) pICOMInterface[i] = new ImplementingClass; for(SIZE_T i = (reserve-1); i >= required; i--) delete pICOMInterface[i]; [/code] I'm trying to get a set …

[b]Purpose of the program:[/b] This program is supposed to use a void function called removeLetters to remove both uppercase and lowercase letters from a given string. The function isn't allowed to use square brakets (ie no arrays) and the only (1) local variable allowed must be a pointer. [b]Problem:[/b] The …

Hello, I have a weird problem. I have a class implemented that looks something like the following: [CODE] class textBox { public: // default constructor textBox() { m_text = ""; } textBox(string text) { m_text = text; } string getText() { return m_text; } private: string m_text; }; [/CODE] Now, …

Hi, I've a really huge recordset having lacks of records. For some reasons I've to take all the records into an array (using loop) to do some processing and then put it into a grid. Now since the recordset is huge the memory is not able to handle the array …

[url]http://www.daniweb.com/forums/thread252440.html[/url] gets me this error message [quote=daniweb_server] Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 3842759 bytes) in /home/daniweb/httpdocs/forums/includes/class_bbcode.php(172) : eval()'d code on line 150 [/quote] I'm assuming the OP has pasted a bitmap (or some other stupid thing) into the message, rather than an attachment.

I'd like to create a matrix class using the vector library. I have seen many examples of creating a matrix class using standard C arrays, and in each of these, arrays are declared in the private section of the class declaration, and initialized in the constructor function, as such: [code=c++] …

Hi, I would like to know if there is any way using C# to free the memory being used. I have a very complex application where OutOfMemoryException occurs frequently. Is there any code or any other possibility to free the used memory, say at the beginning of each iteration of …

This is my program, it causes memoryleaks. I show only a small part where the problem exist. Starts with the header then the cpp. ParticipatorRegister.h [CODE] #ifndef PARTICIPATORREGISTER_H #define PARTICIPATORREGISTER_H #include "Participator.h" class ParticipatorRegister{ private: Participator **arr; int inc, init, elem; void initiate(); //void expand(); public: ParticipatorRegister(); ~ParticipatorRegister(); //void save(ofstream&); …

Can't figure out what's wrong with my delete function. If I remove the delete for the name and address it works as expected, but am I not leaking memory that way? [B]Structs:[/B] [CODE] struct Person { char* name; char* address; int zipcode; }; struct Node { Person* per; // Person …

hello; can some one please tell me as to what is is the significance of memory address register size? when we are designing an architecture say for a 3 address-format machine with a 14 bits MAR. What should we consider in allocating the appropriate number of bits to the op-code, …

I am trying to read the value of memory address using c++. For example, how can I read the value contained in "00B12318"? I have tried: [CODE]int value; 00B12318 = &value; cout << value;[/CODE] But sadly it doesnt work. Please help! THank you :(

Hello. This problem occured in a program that used dynamic memory, and the arrays were deleted and reallocated several times with varying length. It seemed to me that after deleting the arrays, the pointer is still pointing to some data with the same length. (And of course i didn't want …

Hi I am create one application in which add some selected images into flowlayoutpanel but how to remove memory assigned to particular images in flowlayoutpanel [B]It give some error like this[/B] (the process can not access the file "C:\Images\xyz.jpg" because it is being used by another process)

Hi, I'm trying to implement my own allocator using malloc and free. One thing what interests me is that in declaration of deallocate in addition to pointer we have also parameter size which suppose to be size of elements allocated with allocate but having implemented my deallocate as this: [code=c++] …

I am getting this error message, but I am not sure what I am doing wrong? Here is a edited snip-it of my code - [code=c] void WriteProgram(clientProgram *ptrToProgram, int *ptrTotalWkOuts, int *ptrNumOfEx) { int wkOut = 0; clientWorkout *ptrToWorkout; int *autoPopulate = (int *) calloc(1, sizeof(int)); clientWorkout *ptrToFirstWorkOut = …

I have to write a very simplistic password cracker for a Security Class...Basically, the professor gave us a binary file with five encrypted passwords and a list of 354984 possible words. The first part of the assignment was easy, I can crack the 5 passwords in under a second. But …

Hello All, Where is the memory allocated for Value TYpes which are part of a class, when you create an instance of the class, it goes on heap, where is the memory allocate members which are of value types in the class? Class Customer { private int _customerID, private string …

When you know that a value will be very small (single digit), wouldn't it make sense to use Int16 instead of Int32? It seems that the least amount of memory required for every variable would be preferable.

Hello all. I have a small problem. I have a crewler, that gets into one website and extract some info from it, and writes the exctracted content to file. The only prob, that in 3~4hours of work, thise script uses 1 gig of ram. [code]for(my $increment = 1; $increment <= …

I posted a program earlier today in response to another thread and noticed that I had forgotten to clean up/free the memory I used. Here's the program. [code=cplusplus] #include <iostream> using namespace std; int main() { int LIST_SIZE, NUM_CHARS_PER_ELEMENT; cout << "Enter number of elements in list: "; cin >> …

Hey i'm new to this site, idk if this is the right place to be posting this but considering I know people here I thought this is where I would start. For some reason recently while i'm using iexplorer to watch netflix movies after a while; meaning about an hour …

Hello, everyone! I have a problem with memory free. Here is the necessary code to understand the problem: [CODE] void fillArray(char** referenceArray, FILE* grid) { //Chaîne qui va contenir une ligne du fichier. char* lineContent = malloc((width + 1) * sizeof(char)); //Pour contenir le "\0" int i, j; for (i …

I am attempting to read and process a very large .csv (~75 Mb). I have been able to load the file into a string, but when I begin processing the string I run into problems. I am looking for memory management advice on these sorts of operations. String.Split() - OutOfMemoryException, …

Got this memory error frequently in CherryPy so some of our users could not access many pages. 2009/04/01 21:18:14 INFO Traceback (most recent call last): File "D:\Python24\lib\site-packages\cherrypy\_cphttptools.py", line 274, in run finalize() File "D:\Python24\lib\site-packages\cherrypy\_cphttptools.py", line 576, in finalize content = ''.join([chunk for chunk in response.body]) MemoryError Anyone could recommend some …

Hi, all i am reading some memory leaking problem articles now. Here is one question i can't understand: [code=c++] char *a= new char[10]; char *b= new char[10]; b=a;//pointer assignment delete []b; [/code] In this article, it mentioned that the pointer assignment have side-effect and we couldn't delete pointer b from …

I have written some code to dynamically allocate memory for a 2D matrix. I am using overload operator to perform functions on the matrix naturally. I am having memory issues (Unhandled exception at 0x... Access violation reading ...). Here is my class, header, and main code. The code builds fine …

I am trying to produce a program which produces a random array of numbers but I am running into a problem in that when the array becomes even a little large, say 10x10, I get the Bus Error or Segmentation Fault (I think I still get the error with even …

can you please give me an article address which tells when to use stack and when to use heap, how to use them properly and the performance issues related to usage. Thanks

I have been working on C++ code optimization to minimize the memory leaks and better performance on HP-UX with aCC I have the following example to share with you I have a structure SYS_LC_DETAILS_CDA for which I have allocated a memory using malloc and then memset and then calling a …

Hi, I got this message "Windows has triggered a breakpoint in inout.exe. This may be due to a corruption of the heap, and indicates a bug in inout.exe or any of the DLLs it has loaded. The output window may have more diagnostic information" while debugging the following program in …

Hello, I've to build a database of students in a certain school in which each student has a list of her/his passed exams along with the grade gotten. I have 3 structs and I need an advice on how to carry out memory allocation, eg. when I add a student. …

Hi, I am getting the following error: test.o(5209) malloc: *** mmap(size=2097152) failed (error code=12) *** error: can't allocate region *** set a breakpoint in malloc_error_break to debug I am using finite recursive function in my program. Please help with my query. Thanks

I have written a text editor that sorts lines, I plan to use it with some large files. say about a million lines, ranging between 10 and 75 MB. I am currently testing my app using about a 50mb file with about 900,000 lines. the program adds all the lines …

Is there a website that has some kind of GUI or application that allows users to enter statements like-- delete delete [] for... n elements... delete arr[n] --etc so that they can learn good memory management? I sifted around some free ebook sites and found one but the link to …

Right now I feel fairly unlearned with dynamically allocating memory... even after doing so several times and doing projects that require one to dynamically allocate memory for classes and primitive types. Basically, how does one research allocation for different scenarios such as... [code=c++] #include <cstdlib> #include <iostream> using namespace std; …