Questions tagged [pset4recover]
The pset4recover tag has no usage guidance.
125
questions
0
votes
1answer
23 views
Where am I mystaking ? pset4-RECOVER
I've been rewriting that code for about a week now and start beeing very confused about what I am doing wrong, I hope my logic isn't fully wrong but I have some doubts about my understanding of ...
0
votes
1answer
8 views
In Recover, when I run check50, it says timed out while waiting for program to exit. But when I run it with ./recover card.raw, it works perfectly
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
typedef uint8_t BYTE;
int check_jpg(BYTE array[]);
int main(int argc, char *argv[])
{
if(argc != 2)
{
...
0
votes
1answer
11 views
pset 4 Recover: Segmentation Fault in If-else-statement
I am trying to solve why I get a segmentation fault in my code "recover". It's right at the end of the file. I solved the pset4 by trying different solutions. However, I don't understand why ...
0
votes
1answer
26 views
Why can't I assign the return value of a fwrite() function to another variable? Infinite loop
In 'recover' I wanted to jump out of my while loop if the fwrite() function of the last photo (of the file) returns a value < 512 (indicating that the last photo or end of file is reached). I ...
0
votes
1answer
61 views
cs50 2021 pset4 recover help
EDIT: Ok after trying for 3 hours after posting this I have finally managed to solve this pset. The problem wasn't actually a logical one but rather it was a problem with the type definition and the ...
0
votes
1answer
11 views
Segmentation Fault in recover.c
I keep getting a segmentation fault in my recover.c and I am not sure why. I have been stuck on this one for days. The idea is that we are trying to recover some deleted jpg files from a card.
Thank ...
0
votes
1answer
25 views
Need Help with using malloc and PSET4 Recover
I cannot tell what's wrong with my code. When using check50 I keep getting the results below:
:) recover.c exists.
:) recover.c compiles.
:) handles lack of forensic image
:( recovers 000.jpg ...
0
votes
1answer
20 views
buffer array full of \000, pset 4 recover segfault
I am experienceing a problem where nothing is beign read into a buffer array, but for the life of me I am unable to figure out why. I have read through other threads with users experiencing the same ...
0
votes
1answer
34 views
Why does `size` = `0` occur?
I've been trying PSet4's Recover. I've been trying to obtain the size of the entered file (card.raw) but unfortunately size gives and output of 0.
Here's the code that I've made to find the file's ...
0
votes
0answers
23 views
How do I interpret Valgrind to fix this program's segmentation fault?
I was attempting PSet 4's Recover but kept running into a segmentation fault. I tried using Valgrind to debug it but I have no idea of how to interpret the error message.
My code:
#include <stdio.h&...
0
votes
1answer
53 views
Recover.c - Code Creates JPG files but it doesn't doesn't match expected output
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
//user didn't enter one argument or enters more than one
if (argc &...
0
votes
1answer
43 views
not recovering any JPEGs though the code works
can someone tell me what is wrong with my code it works and recovers but no images are found upon checking
:) recover.c exists.
:) recover.c compiles.
:) handles lack of forensic image
:( recovers 000....
0
votes
1answer
52 views
PSET 4 Recover.c - Segmentation fault
The code compiles perfectly. However, it triggers a segmentation fault which I imagine is due to a wrong use of pointers. This is the code:
#include <stdio.h>
#include <stdlib.h>
#...
0
votes
1answer
17 views
Why is my recover code not giving any output?
I'm very confused why this code is not giving any output:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
typedef uint8_t BYTE;
long int findSize(char file_name[])
...
0
votes
1answer
53 views
PSET4 Recover: Check50 shows error
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
typedef char* string;
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
if (argc != 2)
{
...
0
votes
1answer
34 views
pset4 recover error - timed out while waiting for program to exit
i am getting a timed out error but don t understand why...?
also i can see all the pictures except the last one (049.jpg) ...
#include <stdio.h>
#include <stdlib.h>
int main(int argc, ...
0
votes
1answer
39 views
Pset4 Recover Creating Segmentation Fault
Trying to work through Pset4 Recover. Currently getting a segmentation fault and not opening any new jpegs. My logic thinking here was to:
Make sure user submits just 1 command line argument
Open ...
0
votes
1answer
29 views
Pset4 Recover Segmentation Error. Valgrind unable to find anything
I'm sorry to bring about yet another segmentation fault but I cannot for the life in me find the error (Even valgrind is kinda malfunctioning).
Here's my code-
#include <stdio.h>
#include <...
0
votes
0answers
26 views
Recover, almost there… images doesn’t show correctly
I think I'm very close to getting this one right, but I've been trying different codes with the same results so I think my logic must be wrong. This code finds correctly the jpegs and creates the ...
0
votes
1answer
35 views
pset4 recover: Not getting as many files as the problem requires
After reading a few submissions for help here and in the subreddit, People have told me there should be 50 files in the memory card. I have made a loop that correctly reads the file, but as soon as I ...
0
votes
1answer
54 views
Pset4 Recovery Produces Corrupt Null Files & Skips An Image
I've been working at recovery for a while - I believe I'm nearly done with it - but right now my code is giving me serious problems. Currently, running ./recover card.raw produces 49 of the 50 images (...
0
votes
1answer
49 views
pset 4 - recover. Can't figure out what is going wrong!
Can't figure out what I'm doing wrong, I've spent like 2 days on it already, please help!
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
if (argc != 2)
{...
0
votes
1answer
37 views
pset4 - can't figure out what i'm doing wrong - recover
This is the code:
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
if (argc != 2)
{
return 1;
}
FILE *file = fopen(argv[1], "r&...
1
vote
1answer
26 views
pset 4 - recover, can't figure out mistake
I can't figure out what I'm doing wrong, please help!
#include <cs50.h>
#include <stdio.h>
#include <stdlib.h>
#define BUFFER_SIZE 512
int main(void)
{
// open memory ...
0
votes
1answer
24 views
Pset4 Recover Segmentation Fault Issue
I'm having an issue with my code, and I was hoping you could help! I keep getting a segmentation fault error, and I'm not sure why. I've ran valgrind and according to its findings, the issue seems to ...
0
votes
1answer
57 views
Typedef uint8_t BYTE returns unknown type name
My recover.c programme returns unknown type on the cs50 ide, but on a different IDE, it compiles but stops short at the if statement that checks if it is a valid jpg file. Then returns segmentation ...
0
votes
0answers
35 views
Recover.c fprintf failing on the 35th file
So on the recover.c program, my program works to recover the first 34 images, but it segfaults on the 35th.
I've determined that it has to do with the fprintf function, but it worked the first 34 ...
0
votes
1answer
20 views
Pset4 recover code only shows parts of the picture
I've worked on the code and gotten it to the point where it recovers all 50 images. However, the images only display parts, usually starting in the top left corner. This is my current code. Can ...
0
votes
1answer
24 views
Understanding the contents of the raw file
I'm playing around with file pointers in preparation for the Recover Problem. I'm trying to understand something here. I can't actually open up the raw file to read on my IDE. And neither can I read ...
0
votes
1answer
57 views
Stuck on recover
I am currently stuck on recover and cannot understand the fread function and how does it behave. I have watched all the shorts and explanations but i still don't get it. I also wasn't able to find any ...
0
votes
0answers
35 views
For pset4/recover i keep getting an error despite the pictures recovering when i run the program
could someone please identify whats wrong with my code. im a beginner and completely lost.
1
vote
2answers
45 views
Major Help Needed on CS50 - Recover
I would love any possible help with this code. I think I've got the general idea, but I keep running into segmentation faults. Thank you to anyone who gets a chance to look this over! I've been very ...
0
votes
1answer
50 views
Pset4 Recover - Unexpected Output
My program outputs JPEG files, but not enough and they are corrupted.
It has been a long day and it is Friday.
Any kind of push in the right direction would be fantastic thank you.
#include <stdio....
0
votes
1answer
48 views
PSET4 Recover: Where do my ###.jpg files end up?
My code looks right, and after some segmentation errors, I finally fixed that, but I've run into a problem: My created ###.jpg files don't actually seem to be written to anywhere, as in I can't find ...
0
votes
1answer
38 views
pset4 - My recover programme compiles but doesn't generate JPEGs as expected
After 12hrs of banging my head against this, and having trawled Stack Exchange, I've decided that it's time to ask for help!
Really not sure where I'm going wrong, but suspect it's related to the ...
0
votes
1answer
43 views
pset4 recover only recovers 25 correct images
This is my code for recover. When I run the program, it gives me 25 successfully recovered photos. I don't know why it is only giving me half the required photos. I believe it might have something to ...
1
vote
1answer
24 views
CS50 recover (fclose giving segmentation fault)
found a few answers to the segmentation fault issue in CS50 recover while closing the file but I couldn't translate the answers to my issue:
The last part:
fclose(f);
fclose(img);
is resulting into ...
0
votes
1answer
64 views
PSET4, RECOVER: Segmentation Fault
I have been trying to solve RECOVER from PSET4 and I keep getting a segmentation fault. Any ideas on why this happens?
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
...
0
votes
1answer
28 views
recover compiles but has segmentation fault when running it with ./recover card.raw, could anyone take a look
#include <stdio.h>
#include <stdlib.h>
#include <cs50.h>
int main(int argc, char *argv[])
{
//this counter to keep track of how many jpegs found so far
int counter = 0;
...
0
votes
0answers
26 views
Segfault error, please help
I really need help, I'm getting a segfault error. Please look through my code and help me, please.
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char ...
0
votes
2answers
50 views
Incompatible pointer types passing BYTE to FILE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
//Define BYTE
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{//Check if command line is correct//
if (argc != ...
0
votes
1answer
38 views
Code only detects one jpeg in pset4 recover problem
my code for pset4 recovery only detects one jpeg signature.
Here's my code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <...
-2
votes
1answer
59 views
While loop for recover pset4
I need a plain English explanation of how the while loop operates for the fread statement.
After reading in the first 512 bytes, how does it loop to the next 512 bytes till it gets to the last block?
0
votes
1answer
119 views
CS50/PSET4/RECOVER- Error- “Can't open card.raw: file format unsupported”
Keep getting "Can't open card.raw: file format unsupported" error when running the code. Not sure what I'm doing wrong.
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *...
0
votes
1answer
164 views
PSet4 Recover, only finds 22 corrupted photos, doesn't pass Check50
Originally, my code always returned Segmentation Faults whenever running it. I used printf statements to find and fix the segmentation faults, but now it is only finding 22 out of the 50 photos and ...
0
votes
1answer
531 views
Help with “RECOVER” Pset4
My program keeps failing the last 3 on check50 '.jpg not found'... I dont see what the problem is, can someone help?
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
...
0
votes
1answer
49 views
CS50 PSet 4 Recover, Segmentation Fault
My code compiles, but whenever I run Check50, I get a segmentation fault error for each category. Would definitely appreciate any help identifying where the problem can be fixed!
#include <stdio.h&...
0
votes
1answer
47 views
Pset 4 Recover - Middle Images Don't Recover Correctly
When I run recover, most of the pictures get recovered correctly (first and last are correct), but some in the middle don't for some reason. Any ideas why? Any help would be appreciated.
#include <...
0
votes
1answer
51 views
CS50 pset4 recover.c produces unsupported jpg images
Here is my code. Please help.
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#define BLOCK_SIZE 512
#define FILE_NAME_SIZE 8
typedef uint8_t ...
0
votes
1answer
573 views
(pset4) Fatal error: glibc detected an invalid stdio handle
everyone!
I've been stuck with this one for a little while.
Through debugging I found out that my problem is probably in the size parameter I'm trying to pass to fread() in line 33 (start of the while ...
