[memory-management] Forum Topics

I'm currently building a museum membership management system using .NET and a relational database. The project is inspired by solutions like MembershipAnywhere, which help museums manage digital memberships and improve the visitor experience. The system is designed to handle member registration, digital membership cards, QR code check-ins, membership renewals, notifications, …

add to source, compile and run. very brief example usage (basically just the calling syntax) included in the commentstwo functions; the first dynamically allocates a 2D array with a user- or program-specified number of rows/columns; the second deallocates the same array. demonstrates the mutlti-dimensional usage of malloc and free. /* …

Hi guys , Assume the following is my program, is there a way to see how the memory is being allocated by the java program ? How do I use jconsole to find out where in main memory that Integer i = 10 is being saved? public class IntegerCmp{ public …

This is the first time I have felt a smidgen of fear when learning C++. I am doing an exercise in *Accelerated C++* and the fear is that I'm not appropriately handling memory. I'll list my code below but I figured I would give some specific questions first: 1. Is …

When I dynamically allocate mem within a function, do I have to still manually release it? Or does it go away once the function has run and returned (like local variables)? If I do have to release it, since it's basically a pointer can I do that from main? Do …

this might be a simple question so accept my appolegises , I am creating a 2 dimetional pointers to int and I want to release the memory at the end but I think I'm doing It all wrong and all of the memory isn't being relaesed. int **a; a = …

->Hi Daniweb-Web Developers. ->I'm using PhP 5.2.5,WAMP 5,MySQL 5. -I'LL TRY TO EXPLAIN IN DETAILS THE WHOLE STORY:- ------------------------------------------------- 1: I've declared a global variable dynamic array ALPHABETS_COMBINATION. 2:It is populated with a group of 3 Alpha combination AAA-ZZZ in a function : Generator($ALPHABETS) 3:Once the Buttonn click event is …

I have a container object which contains float*. struct MyCon{ MyCon(){ matA = new float[10]; matB = new float[10]; } float *matA; float *matB; } And, I am storing pointers to MyCon objects in a std::map. map<string, MyCon*> myCon_map; myCon_map.insert(pair<string,MyCon*>(string("str"), new MyCon())); Once I am finished with myCon_map, how do …

IplImage *in; CvMemStorage *storage = cvCreateMemStorage (20506); CvSeq *contours=NULL; CvPoint *PointArray=NULL; for() { //image processing and feature extraction code here cvClearMemStorage (storage); //clear memory area free (PointArray); cvReleaseImage (&in); } At the end of each iteration i ma releasing memory but still i get memory shortage error after # processing …

I'm working on a project that generates roughly between 13x512 values in which I compare at run-time. So the program outflow will be sort of as follows: - Program executes - Extracts (1) 12x512 - Extracts (2) 12x512 - Compares (1) to (2) - Extract (3) - Compares (3) to …

Hi everybody, is there anyone with experience with opencv for python? I was wondering if there is a way to allocate some memory on demand, since when I try processing images (usually bigger than 800x800 pixels) I get a "OpenCV Error: Insufficient memory (unable to allocate 59500564 bytes)" message. (bytes …

Does anyone have a tutorial for writing Custom Allocators and Memory Pools for std::vectors and Objects? Basically I've looked at placement new and I want to know how I can force vectors to use this with my shared memory pointers. I'm thinking writing a class for it might be much …

#include <stdio.h> main() { char *s1, *s2; printf("Enter string 1 :"); scanf("%s", s1); printf("Enter String 2 :"); scanf("%s", s2); printf("%s\n%s", s1, s2); } The output of 1st string is right and the output of 2nd string is wrong (i.e. (null)) Can any 1 explain what is going behind?

hello friends, could you guide me how i can write my own version of malloc and free function

Hello, wondering if someone can help me quickly.. Basically, I have created a array to store all the data in a text file. The pointer of the array is sent to a function, which then populates it. Here is the code: void Data(char* theData) { ifstream txtFile(inputFile.c_str()); if(!txtFile.is_open()) { cerr …

I'm using the Guichan lib and I was trying to run the "First application with Guichan, OpenGL and SDL" example, which is located here [Click Here](http://guichan.sourceforge.net/oldsite/getting-started.shtml) . Everything was fine exept when I exit the program and delete all the pointers which were allocated with the "new" and because of …

Hi, I have a swing application which works on CSV file. It reads full file line by line, computes some required statistics and shows output. The Upper part of output screen shows each record from file in that order in JTable, whereas lower part shows statistics computed based on that …

I am trying to use the glib HashTable implementation for my code and facing some issues in memory allocations. The code I've written is: GHashTable *g_hash_table; g_hash_table = g_hash_table_new (g_direct_hash, g_direct_equal); gint *port, *src_value, *value; guint32 *dst_key, *key; . . . while(1) { key = g_malloc (sizeof *key); dst_key = …

Hi there. Recently, i wrote a program that would return ridiculously high numbers as BigIntegers. The program is working at all, but when the BigIntegers get to a value that I have estimated to be around 2^329554, and takes up between 30-45 kilobytes, i get this error: Exception in thread …

Hi- I have a script that grabs a lot of information for a page that has a 'Research Mode.' Basically, it grabs a bunch of data, then uses JS to show or hide info based on user criteria. It used to work fine, but we've been adding more info -- …

Hello everyone!! I have a problem about memory allocation, i use calloc() to initialize all elements in array to be zero. This is my code: #include <stdio.h> #include <conio.h> #include <stdlib.h> #include <time.h> #define sizes 1200 main() { double** arr; int m[sizes]; int i,j,k; srand((unsigned)time(NULL)); arr= (double **) calloc(sizes,sizeof(double*)); for(k=0; …

I'm looking for feedback on my code. I wrote a custom memory allocator (out of pure boredom) that is faster than the STD one (malloc, free). It's pretty simple in the way it works, it has a base block of memory which is where everything is allocated from, and it …

I am working on a game making (or really just general program making, but my question applies to games) DLL for opengl. It is almost done but the collision detection is a little bit slow since it has to calculate bounding boxes for each object repeatedly. I was thinking of …

Greetings all; what I'm trying to do is create an array of structs dynamically by using functions for allocation, display, and then freeing memory. I'm *able* to do the process if it's within scope of the foo declaration, but the initFoo function throws an exception. I *think* it's the order …

I have a program that dynamically allocates an array and uses it. The thing is that under certain situations this array will get infinitely long. As such I would like to know if/when the array has gotten too long and then start saving it to a file (where length will …

I remember someone telling me that there is the heap, the stack and something else. methods are stored in ..something.. and variables somewhere - and even if they're not currently storing anything in the memory location - it's still "reserved"? 1. Does that mean it doesn't matter if I do …

When trying to cut down possible memory leaks in my program, I noticed a reoccoring pattern: Move Delete closer to new, repeat, remOve the function that uses it and move code to main, move a few things to global, replace some stuff with arguments and return values, and in the …

hi everybody, the double type is 8B, right ? So if i use this code : [CODE]double pear[500000000];[/CODE] it will use 4GB of Ram ? or there's a limit for arrays ? thanks

So going over the new DirectXMath and loving how it has better documentation then the old versions, but anyways. It makes a note on many of its targets need to have aligned memory blocks, but that throws me for a loop because I don't know of a way to declare …

Hi all! I am having trouble accessing dynamic information. I have used the malloc command to allocate the necessary memory for my struct. However, when I leave that function and enter a display function it says there is a problem accessing the information in the struct. I just had a …

I have nearly finished an assignment that calls for implementing a media library. I have pinpointed my current solution for the addItem method in the library class as a memory leak, but so far I am not certain how to fix it. The addItem method I have so far is …

[CODE] #include<stdio.h> #include<conio.h> #include<malloc.h> int main() { int i=0,j=0,n=0; char *a,**b; a=(char *)malloc(sizeof(char)*50); printf("Enter your text\n"); gets(a); while(a[i]!='\0') { *(b+n)=(char *)malloc(sizeof(char)*20); //error for(j=0;a[i]!=' ';i++,j++) { *(*(b+n)+j)=*(a+i); } i++; n++; } printf("Words in given text are \n"); for(i=0;i<n;i++) { puts(*(b+i)); printf("\n"); } printf("Possibile combinations are \n\n"); for(i=0;i<n;i++) { for(j=0;j<n;j++) { if(j!=i) …

Hello just curious, I know that i'm supposed to use new in c++ but decided to experiemnt with malloc. Can you explain to me why the following code crashes and what is the reason. I was under the impression that the size of vector is fixed as it just stores …

For example if a memory address within the process had the value 1616 how could I find it ?

Hi. Let's say I have the following method: [CODE] void createNewObject() { MyClass myObject = new MyClass(); } [/CODE] If I call this method 1000 times, how many instances of MyClass will be left in my program's memory by the time all calls have been made? 1000, 1, or 0? …

I have this little problem (at least I hope it is little). My vb6 program behaves differently when I execute it with the execute button in vb6 and when I execute it by using the compiled .exe file. I have a huge 2 picture boxes which loads 2 x 5 …

Hello, I have a difficult memory error to find. I have narrowed it down to a small piece of code, tiny in fact, but the symptoms are baffling to me. I tried to find it with electric fence, but electric fence found nothing. The problem is complicated by my liberal …

Hi please find this simple program, not sure why realloc is not working and its causing memory leak. But if calloc and malloc is used with little changes it works fine. [CODE]#include "string.h" #include "stdio.h" #include "stdlib.h" char *mystrcat(char*, char*); void main(void){ char str1[] = "quick brown fox"; char str2[] …

let's say we have a unsigned char pointer with allocated memory of 1 million bytes. Could you give a little code sample which shows how to eliminate first 1000 bytes? the little similar situation is like below: unsigned char array: 12,34,67,99,215,250,123,67 i want to make it: 215,250,123,67 I want to …

I am having trouble correctly allocating memory for a parent function that will remain upon the child functions exit. the call to the child function is [code=c]HTTP_packToGen((char*)http_headerContent.HTTP ..[/code] the HTTP variable within http_headerContent is a char pointer that isn't allocated until the child function is called, http_headerContent is a static …

Hello! I have written a nested for loop with an inner loop of 86400 iterations and the outer loop 365. It compiles and everything but only gives me 97 of the 365 results. This is the error message: [CODE]aqua(855) malloc: *** mmap(size=268435456) failed (error code=12) *** error: can't allocate region …

Hi all I'm stuck with this problem for a couple of weeks now, and my normal human brain can't tell me what's going wrong. I've created my own class, inheriting from QThread. Nothing weird in calling it: [CODE] MyThread *thread = new MyThread(); thread->start(); while(thread->isRunning) ; delete thread[/CODE]; I know …

Is there any function that allows me to completely remove and [I]deallocate[/I] all contents of a std::map? The functions [icode]clear()[/icode] only removes all elements, it doesn't free any memory.

I was wondering why when I run task manager > performance - it gives me the amount of memory available (e.g. 2000MB), when I run a program, (say Firefox) it drops to a smaller amount of memory that is calculated as being available (e.g. it will drop to 1950MB). My …

Hey folks, just a quick question i can't seem to find the answer to. If i overwrite a container with a pointer in it, does the pointer and therefore the object it points to still exist, and would that be considered a bad handling of memory. For instance. I have …

Hi, I am writing this template Array class. I am trying out some different functions, anything I can think of to implement. I have written an Add function as follows: [CODE] /**Add function - adds an element at the top of the stack**/ //creates new Array 1 larger //sets position …

i understand when you use memory on the heap, your program allocates new memory to it to be used...the stack is preallocated memory and when u put a local variable on the stack, and the variables goes out of scope/dies, it technically still stays in memory until you overwrite the …

I'm trying to make a memory pool, I've got everything sorted out except for one thing: the allocation. I have no idea how to return a segment of the data in the pool. I have it like this [icode]byte *m_pData;[/icode]. How would I be able to return a segment of …

Hi, Im trying to run this program using dynamic memory i cant seem to get it to keep running it crashes on me. I have the working program so the code is correct im just haveing trouble trying to convert it correctly. Thank You, [CODE]#include <iostream> #include <fstream> using namespace …

I have 2D char array, dynamically allocated (using malloc). I need to add another line to it but I have no idea how to use realloc with 2D arrays. I have this: [CODE]res = (char **) malloc(1 * sizeof (char*)); for (i = 0; i < 1; i++) { res[i] …