file-handling is an abstraction of common actions such as creating, opening, closing, reading, updating, writing, comparing and deleting files
Questions tagged [file-handling]
2915 questions
1433
votes
11 answers
How do I move a file in Python?
How can I do the equivalent of mv in Python?
mv "path/to/current/file.foo" "path/to/new/destination/for/file.foo"
David542
- 104,438
- 178
- 489
- 842
319
votes
12 answers
How to check if a file is empty in Bash?
I have a file called diff.txt. I Want to check whether it is empty.
I wrote a bash script something like below, but I couldn't get it work.
if [ -s diff.txt ]
then
touch empty.txt
rm full.txt
else
touch full.txt
rm…
Mich
- 3,253
- 2
- 14
- 6
228
votes
8 answers
How can I download a file from a URL and save it in Rails?
I have a URL to an image which i want to save locally, so that I can use Paperclip to produce a thumbnail for my application. What's the best way to download and save the image? (I looked into ruby file handling but did not come across anything.)
Alok Swain
- 6,409
- 5
- 36
- 57
185
votes
7 answers
How to find and replace text in a file
My code so far
StreamReader reading = File.OpenText("test.txt");
string str;
while ((str = reading.ReadLine())!=null)
{
if (str.Contains("some text"))
{
StreamWriter write = new StreamWriter("test.txt");
}
}
I know how…
Win Coder
- 6,628
- 11
- 54
- 81
121
votes
10 answers
Write text files without Byte Order Mark (BOM)?
I am trying to create a text file using VB.Net with UTF8 encoding, without BOM. Can anybody help me, how to do this?
I can write file with UTF8 encoding but, how to remove Byte Order Mark from it?
edit1:
I have tried code like this;
Dim utf8…
VJOY
- 3,752
- 12
- 57
- 90
104
votes
9 answers
How to read a file line by line or a whole text file at once?
I'm in a tutorial which introduces files (how to read from file and write to file)
First of all, this is not a homework, this is just general help I'm seeking.
I know how to read one word at a time, but I don't know how to read one line at a time,…
Mody
- 1,267
- 3
- 10
- 11
58
votes
3 answers
Why does my Python code print the extra characters "" when reading from a text file?
try:
data=open('info.txt')
for each_line in data:
try:
(role,line_spoken)=each_line.split(':',1)
print(role,end='')
print(' said: ',end='')
print(line_spoken,end='')
except…
user5234170
53
votes
2 answers
Exception Handling and Opening a File?
Is it possible to use exceptions with file opening as an alternative to using .is_open()?
For example:
ifstream input;
try{
input.open("somefile.txt");
}catch(someException){
//Catch exception here
}
If so, what type is someException?
Moshe
- 57,511
- 78
- 272
- 425
51
votes
5 answers
What does an assignment expression evaluate to in Java?
I encountered a statement in Java
while ((line = reader.readLine()) != null) {
out.append(line);
}
How do assignment operations return a value in Java?
The statement we are checking is line = reader.readLine() and we compare it with null.
Since…
sunder
- 968
- 2
- 11
- 31
46
votes
6 answers
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process
My code is for a script that looks at a folder and deletes images that are under a resolution of 1920x1080. The problem I am having is that when my code runs;
import os
from PIL import Image
while True:
img_dir = r"C:\Users\Harold\Google…
user2885647
- 855
- 2
- 9
- 10
35
votes
4 answers
Php create a file if not exists
I try to create files and write the contents dynamically. Below is my code.
$sites = realpath(dirname(__FILE__)).'/';
$newfile = $sites.$filnme_epub.".js";
if (file_exists($newfile)) {
$fh = fopen($newfile, 'a');
fwrite($fh, 'd');
} else {
…
shyamkarthick
- 499
- 1
- 4
- 17
34
votes
3 answers
Why is my iOS app not showing up in other apps' "Open in" dialog?
I am trying to implement the registering process that allows my iOS app to show up in the "Open in" list of other applications (as described in Apple's Document Interaction Programming Topics). I want my app to be able to handle audio from any app…
user577537
32
votes
9 answers
How to read text file by particular line separator character?
Reading a text file using streamreader.
using (StreamReader sr = new StreamReader(FileName, Encoding.Default))
{
string line = sr.ReadLine();
}
I want to force that line delimiter should be \n not \r. So how can i do that?
User13839404
- 1,803
- 12
- 37
- 46
30
votes
6 answers
How do I clear the whole contents of a file in C?
I have a file with some of user1's data. I want to use the same file for user2 by clearing the content of the file.
My idea is that when a new user comes, data of the previous user should be clear and the same file should be ready for the new user.…
mujahid
- 691
- 2
- 12
- 21
28
votes
4 answers
Difference between System.getProperty("line.separator"); and "\n"?
While developing GUI with Java FX, I seem to get different results with System.getProperty("line.separator"); and "\n" during writing to a file or getting data from internet. What basically is the difference?
Tilak Madichetti
- 4,110
- 5
- 34
- 52