Questions tagged [pset4recover]

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CS50 Recover recovering corrupted images, and only 43 images

I'm attempting to solve the Recover problem, and I'm using a for loop to go through the bytes of the raw file. It spits out 43 images, some of which have the full image, but most are corrupted, and ...
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1answer
19 views

PSET4 RECOVERY does not recover images correctly

I have started working on PSET 4 RECOVERY. My program compiles successfully, it goes through the first 3 tests no problem, but for the love of me I cannot seem to find the problem. It just does not ...
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1answer
27 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 ...
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1answer
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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) { ...
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1answer
14 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 ...
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1answer
30 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 ...
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1answer
88 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 ...
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1answer
12 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 ...
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1answer
28 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 ...
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1answer
22 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 ...
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1answer
35 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 ...
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0answers
26 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&...
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1answer
58 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 &...
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1answer
44 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....
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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> #...
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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[]) ...
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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) { ...
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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, ...
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1answer
42 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 ...
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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 <...
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0answers
27 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 ...
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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 ...
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1answer
61 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 (...
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1answer
50 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) {...
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1answer
41 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&...
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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
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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
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1answer
68 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 ...
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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
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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
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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 ...
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1answer
61 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 ...
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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.
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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
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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....
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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 ...
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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 ...
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1answer
49 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
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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 ...
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1answer
67 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
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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; ...
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0answers
27 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 ...
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2answers
51 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 != ...
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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 <...
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1answer
60 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?
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1answer
123 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 *...
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1answer
176 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 ...
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1answer
539 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> ...
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1answer
52 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&...
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1answer
51 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 <...