Questions tagged [file-pointer]
The file-pointer tag has no usage guidance.
20
questions
0
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1
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94
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reverse .wav file not working correctly
I tried running this code to reverse the .wav audio file, but it does not work as required. Can someone explain what's wrong?
// create array of size (size) to store blocks
BYTE buffer[size];
// ...
0
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0
answers
17
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Segmentation error in Recover Pset - any clues? A bit stumped
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "check_arguments.h"
#include "jpeg_file_structs_and_operations.h"
#include <stdio.h>
...
- 1
1
vote
0
answers
97
views
Lab 4 not altering output file - using solution word for word
I have looked at all the solutions here on the exchange. I have two issues. Firstly:
const int HEADER_SIZE = 44;
This does not work for me in the context of initializing a header array. I either have ...
- 11
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1
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166
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(PSET 4 - Recover) Why is first recovered image blank?
I am on problem set 4 recover and I have nearly completed it. I have written my code and it compiles but when I run it on the card.raw file it appears to recover all the 50 photos except the 1st one ...
- 17
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1
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99
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pset4 - Recover passed check50, but want to understand the logic on fwrite or file-pointer
Below are my code for pset4 - Recover, it passed the check50, but I am trying to understand the logic on a particular process of fwrite or file-pointer.
In short, my question is how does line 74 know ...
0
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1
answer
45
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
1
answer
191
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Pset4 - recover - issue with file pointers
I'm working on recover and I think I'm nearly there but I can't resolve an issue with file pointers.
When I'm compiling I'm getting two errors both say error: use of undeclared identifier 'ptr'.
I ...
- 45
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28
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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
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1
answer
23
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Querry regarding maintainence and usage of files in c
So, csv files are used to store data and so does .txt files. I just want to know how do we manage a large text file. For example, if i have a file which contains all the info about school students, ...
- 51
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2
answers
60
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Can't write jpegs in recover, segmentation fault
here's the code i wrote:
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
typedef uint8_t BYTE;
//take command line argument from the user for the file name
int main(int ...
- 51
0
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1
answer
17
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writting a function to display a file
in the week 4 shorts, it was told how we can write cat command from linux in c:
i Wrote the following code:
#include <stdio.h>
include
void Print_File(FILE *f)
{
char s = fgetc(f);
while (s ...
- 51
0
votes
1
answer
75
views
pset4 recover incorrectly generate images
I need your help with pset4 recover, as image does not recover correctly.
And I would like to have more understanding on how file pointer works. Below is what I have written which generate no correct ...
- 5
0
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1
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546
views
What does a pointer to a file really represent?
I have a question regarding file pointers (i.e FILE *).
I am having a hard time understanding conceptually what this represents in terms of its memory.
When the concept of files was introduced in ...
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1
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39
views
pset4 resize: setting bfSize and biSizeImage hexadecimal values
I'm having difficulty setting the bfSize and biSizeImage header values. I should have the correct formulas for both values, however when I write either value to the output file I lose the leftmost ...
- 3
0
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1
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478
views
The function fread
How does fread actually work? In pset4 recover, i did this
while (fread(buffer,sizeof(BYTE)*512, 1, inptr) == 1)
{
//If signature of first 4 elements is jpeg, create new file and write that ...
- 29
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1
answer
88
views
pset 4 resize.c algorithm problem
I can't figure out why my code wont work. Please help. My idea for solving the height problem was
write one line of the image
move the file cursor to the beginning of the newly written line
read in ...
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1
answer
92
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pset4 Recover Cant figure out why jpeg file pointer gets reset to NULL.
Using Error messages and gdb I figured out why I wasnt getting segfaults- img pointer - to the current jpeg file gets set to NULL. Are my loops all wrong? Im getting myself pretty confused. Code ...
- 3
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1
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84
views
Does IF condition increment file pointer?
Will:
if(some_filepointer != NULL)
{
// do this
}
increment the file pointer? does the evaluation move the pointer to the next character in the file because the if condition read from the file?
- 101
0
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1
answer
50
views
Do I need to initialize my variables to a default value?
When creating a file pointer should I initialize it to NULL or should I leave it uninitialized?
I currently have FILE* img;. I think the better practice is to have FILE* img = NULL; so it it doesn't ...
user2137
1
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1
answer
1k
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Correct use of fopen, fclose, file pointers
I found this problem while working on recover.c. My program recovers all the image files, check50 says everything's cool, but when I run Valgrind, it gives me a ton of errors. After some tests, I ...
- 31