Is it safe to write to a descriptor after ENOSPC
There's nothing special about ENOSPC. It indicates that the write failed, and that reason why it failed has something do with the device not having enough free space to complete the operation. It doesn't leave the file descriptor in a bad or undefined state. The file descriptor remains in the...
populate a 'JTable' with values from a '.txt' file
java,swing,file-io,jtable,stringtokenizer
you need to change your to something like this.you need to reset vector data = new Vector(); each time when you read new line otherwise it contain first row + second row + so on.and also you can call dtm.setRowCount(0); to avoid empty initial rows . and you need only...
I want to add a string in between of 2 strings in file, but in output whole text is getting appended at the end of file
python,file-io,append,python-2.6
Okay, this will definitely fix your problem. fo = open("backup.txt", "r") filedata = fo.read() ix = filedata.index('ending') new_str = ' '.join([filedata[:ix], 'appending text', filedata[ix:]]) with open("backup.txt", "ab") as file: file.write(new_str) with open("backup.txt", "r") as file : print "In meddival : \n",file.read() As you can see, I am getting the index...
Accessing open files globally in Fortran
Yes, that is possible (for both reading and writing). Here is a short example: module test_mod contains subroutine myWrite( uFile ) implicit none integer, intent(in) :: uFile write(uFile, *) 'Hello world' end subroutine end module program test use test_mod implicit none integer :: uFile, stat open(newunit=uFile, file='test.txt', status='replace', & action='write',...
JAVA read text files, count numbers and write it to Jtable [closed]
So, as I see it, you have four questions you need answered, this goes against the site etiquette of asking A question, but will give it a shot How to list a series of files, presumably using some kind of filter How to read a file and process the data...
Cakephp Version 2.x Unable to Show selected file name in edit view
The Problem: According to the CakePHP 2.0 book: Due to the limitations of HTML itself, it is not possible to put default values into input fields of type ‘file’. Each time the form is displayed, the value inside will be empty. While I'm sure there are ways you could hack...
Not checking file size correctly
python,file,python-3.x,file-io,operating-system
Alternatively you could memory map the file (using mmap). First find the last non-zero byte in the file, then check to see if any other bytes are changing after that. If you want to see if the file is still open by another process you could use lsof (you'd need...
Goto line number , and edit a string there in file using C++
fstream Inoutput_file; void BackPatch(int GotoLineNo, string LineNo) { for (int i = 1; i <= GotoLineNo; i++) { char* str = new char[20]; Inoutput_file.getline(str, 20, '\n'); if (i == LineNo-1) { Inoutput_file.seekp(Inoutput_file.tellg()); Inoutput_file.getline(str, 20, '\n'); cout << str << endl; //prints the correct line Inoutput_file << "Goto " + str...
Should I fclose(file) if an error occured?
No, you don't need to call fclose() inside if block. Once fopen() fails, it retruns NULL which need not be closed. To elaborate, if fopen() is success, it will return a FILE *. That needs to be closed. FWIW, the returned pointer in this case, be of whatever value, gurantees...
Troubles reading a single character from a text file
You need to check empty string before char operation. while ((line = bufferedReader.readLine()) != null) { if("".equals(line)){ continue; } char h = line.charAt(7); System.out.println(h); } ...
C - Print the 5th letter of each word read from a text file
You can use following snippet. With this code you need to know Maximum length of line. This code prints 5th character on each line on each word if its length is 5 or more.. Hope this work for you. #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX_LINE 1000 int main()...
Writing out a specific line of a list
c#,if-statement,file-io,console
I think we're helping out with a school program here. There were several questions yesterday that dealt with almost the exact same issue and data. In the mean time, since you want to iterate your result set to look for the exact savings, I would recommend the following, instead of...
Finding a word in a text file
You are looking for lines where the entire line is equal to "Processed". From your comment it sounds like you only want lines that contain Processed, which can be done by using String.Contains: var aCount = a.Count(line => line.Contains("Processed")); ...
Getting Apache Camel to stop retrying if failed to move the file after route completion
java,file-io,exception-handling,locking,apache-camel
This is something that the File component needs to handle, not your route. You can configure how the File component should handle locked files using the readLock option (along with other related options). The option has an extensive description on the File2 component documentation page...
Cancel last line iteration on a file
python,python-3.x,for-loop,file-io
In python3, the 'for line in file' construct is represented by an iterator internally. By definition, a value that was produced from an iterator cannot be 'put back' for later use (http://www.diveintopython3.net/iterators.html). To get the desired behaviour, you need a function that chains together two iterators, such as the chain...
Creating custom std::streambuf
It appears that trying to do this with std::ifstream will not work, and I need to change it std::istream. Once I make this change, the overloaded functions are called and everything works properly.
Unable to modify variables from separate thread
c#,multithreading,winforms,text,file-io
You've got multiple problems here, the use of the File is probably not thread-safe. your method does not repeat your are Sleep()ing on a Thread You can solve all of them by ditching the Thread and use a simple Timer. ...
I can't figure out why “cout” didn't work properly
The problem is that in writefile() you read the stream until you reach the end of file. Once you do that the end of file flag in cin will be set and cin will longer read from input. You need to call clear() to remove the flag and continue reading.
File I/O in C - How to read from a file and then write to it?
When a file is opened for read and write, an fseek() is used when switching between operations. fseek( fp, 0, SEEK_CUR); does not change the position of the file pointer in the file. #include<stdio.h> #include<stdlib.h> int main ( ) { int read = 0; int write = 48; int each...
Node.js v0.10: Replace certain bytes in file without reading whole file
As you've discovered, fs.write with r+ mode allows you to overwrite bytes. This suffices for the case where the added and deleted pieces are exactly the same length. When the added text is shorter than the deleted text, I advise that you not fill in with \x00 bytes, as you...
Get specific entries from .dat file with COBOL
Because you have ACCESS RANDOM in your SELECT, the default action for READ file-name (with no NEXT or KEY) is a keyed read. Change that to ACCESS SEQUENTIAL Change that to READ file-name NEXT anyway, which is an explicit sequential read. I always use an explicit NEXT or KEY on...
indexing a text file into two arrays
A simple approach using Linq var lines = File.ReadLines(@"d:\temp\test.txt"); List<string> apollo = lines.Take(6485).ToList(); List<string> sabre = lines.Skip(6485).Take(6485).ToList(); Of course I take for granted that your file has effectively the number of lines that you have specified....
StreamWriter not appending to file, instead creating a new file in different directory
c#,file,text,file-io,streamwriter
I have found the solution to my problem. I originally was passing in just the name of the file and not the whole path. Of course I missed one function call where I was still passing in the name of the file and not the path leading to the temp...
What is this C programming reading?
There will be random garbage in the word variable because you never initialized it. Then read will only be able to get one byte from the file (nr probably returned 1, you should check that!) which saves one byte, but the word variable still has 3-7 bytes of uninitialized junk...
Linux: Using split on limited space
My attempt: #! /bin/bash if [ $# -gt 2 -o $# -lt 1 -o ! -f "$1" ]; then echo "Usage: ${0##*/} <filename> [<split size in M>]" >&2 exit 1 fi bsize=${2:-100} bucket=$( echo $bsize '* 1024 * 1024' | bc ) size=$( stat -c '%s' "$1" ) chunks=$( echo...
Trying to close multiple stream with finally
java,file,file-io,try-catch-finally
If you are using java6 or lower you could use a wrapper for you close(). public void closeStreams(Closeable c){ try{ c.close(); } catch(IOException e){ } finally{ // well noting here now.. } } And you can use : finally {//cerrando muestras if(muestras!=null){ muestras.closeStreams(); } if(salida!=null){ salida.closeStreams(); } } ...
How can I get the location of a user's Documents directory?
It depends on where you want to write it, which isn't completely clear by your question. If you're always looking for the current user's documents, then you should look at the System.Environment.GetFolderPath method and the System.Environment.SpecialFolder.MyDocuments enumeration value in particular. When that executes, it will give you the path to...
Is it bad to call write() on a file object frequently with small additions?
From the documentation on the open function: open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None) -> file object ... buffering is an optional integer used to set the buffering policy. Pass 0 to switch buffering off (only allowed in binary mode), 1 to select line buffering (only usable in text...
Error: Getting symbols in python output
python,python-2.7,text,file-io,editor
You need to close and re-open your file. print "This is a simple text editor" from sys import argv script, name = argv print "You have selected the file : %s" %name print "Opening the file...." t = open(name, 'r+') print "The contents of the file are" print t.read() t.close()...
Linux: huge files vs huge number of files
linux,performance,amazon-web-services,file-io
The following is a very coarse description of an architecture that can work for your problem, assuming that the maximum number of file descriptors is irrelevant when you have enough instances. First, take a look at this: https://aws.amazon.com/blogs/aws/amazon-elastic-file-system-shared-file-storage-for-amazon-ec2/ https://aws.amazon.com/efs/ EFS provides a shared storage that you can mount as a...
How do I load data from a txt file into variables in my C program?
c,arrays,parsing,file-io,struct
I won't be writing the code, but can try to help with the algotihm, in general. Open the file. Help : fopen() Check for successful opening. Hint: Return value. Read a line from the file. Check for the success. Help : fgets() and Return value. Based on data pattern ,...
XOR binary file in Ruby
Calling to_i on a file handle returns the low-level identifier for it, a singular number, nothing more. If you want to operate on the bytes themselves: File.open(input_file, 'rb') do |f| File.open(output_file, 'wb') do |o| o.write( f.read.bytes.collect do |byte| byte ^ xor_value end.pack("C*") ) end end The key here is to...
Java - Running JAR refuses to load file in the same directory
You read your file as a resource (getResourceAsStream("properties");). So it must be in the classpath. Perhaps in the jar directly or in a directory which you add to the classpath. A jar is a zip file so you can open it with 7zip for example add your properties file to...
Writing an object to python file
vals is a list. If you want to write a list of strings to a file, as opposed to an individual string, use writelines: ea=open("abc_format.txt",'w') ea.seek(0) ea.writelines(vals) ea.close() Note that this will not insert newlines for you (although in your specific case your strings already end in newlines, as pointed...
Comparing strings of text files
c#,loops,if-statement,file-io,foreach
You could try something simple like this: //Making a list for file1 HashSet<string> listFile1 = new HashSet<string>(); string line; StreamReader sr = new StreamReader("file1"); while ((line = sr.ReadLine()) != null) { listFile1.Add(line); } sr.Close(); //Making a list for file2 HashSet<string> listFile2 = new HashSet<string>(); string line1; StreamReader sr1 = new...
Syncronize thread to wait for multiple threads
java,multithreading,file-io,synchronization
java.lang.Thread's method join() allows you to wait for thread to exit. You can try using something like this: //wait for all threads to finish try { thread1.join(); thread2.join(); thread3.join(); } catch (InterruptedException e) { e.printStackTrace(); } ...
Greed on C Program trouble saving game to file
the following is one way to handle the problem: for (int i=0; i<ROWS; i++) { for (int j=0; j<COLS; j++) { if (BOARD[i][j] == 0) { fprintf( fboard, " " ); } else if ( BOARD[i][j] == '@' ) { fprintf( fboard, "@" ); } else { fprintf( fboard, "%d",...
Two XML files. Roughly same number of lines. One is twice the size of the other. How?
xml,vb.net,vba,file-io,filesize
If it's twice the size, then one is UTF-8 (the smaller one) and one is UTF-16 (the bigger one). In UTF-16, every ASCII character takes twice as much space as in UTF-8. (And Unicode means (in Windows) UTF-16)....
C++ efficient way to buffer text and conditionally write portions to a text file
Assuming it's possible, the first and most obvious optimization would be to check the conditions before doing any of the conversions. Along with that, you can avoid creating a string object from the content of the stringstream, and just copy directly from the stringstream's buffer to the ostream's buffer. I'd...
Reading binary file to a string but the types are mixed
As @chux said, the \x that VS is displaying to you is an inseparable part of the char representations that VS is presenting to you. It is trying to be helpful by providing a form that can be used directly in C source code as a char literal. For example,...
How to handle the File hand-off from windows in a python program
So, yes, Windows passes the file name into the script as one of the sys.argvs. It is (so far as I can tell from printing the value) a file name without the path, that I used to open the file, so that tells me that Windows starts my program with...
Getting integer data from txt file in Java
I would define the file as a field (in addition to the filename, and I suggest reading it from the user's home folder) file private File file = new File(System.getProperty("user.home"), filename); Then you can use the diamond operator <> when you define your List. You can use a try-with-resources to...
delete contents of nth file in a folder batch
A batch file solution isn't much fun, because batch can't really count or deal with arrays and indexes, it needs to work like: setup a counter, list the files, count through them, when the count matches the number you want, do something. @echo off setlocal enabledelayedexpansion set i=0 for %%f...
Full path of HttpPostedFileBase is giving error with webclient upload file
c#,asp.net-mvc,asp.net-mvc-4,file-io,webclient
To upload a file using HttpPostedFileBase you can use following snippet: public void UploadFile(HttpPostedFileBase file) { var folderName = "/Content/Upload/Images/"; var fileName = file.FileName; using (var fileStream = File.Create(BasePath + folderName + fileName)) { file.InputStream.CopyTo(fileStream); } } Folder where your files are uploaded is not a case as long as...
python how to write list of lists to file
I would do like this. from __future__ import with_statement mylist = [[1.0,'0:25.0','1:50.0'],[-1.0,'0:56.0','1:53.0']] # as example with open('output.txt', 'w') as f: for _list in mylist: for _string in _list: #f.seek(0) f.write(str(_string) + '\n') As a result, I get this in output.txt: 1.0 0:25.0 1:50.0 -1.0 0:56.0 1:53.0 ...
Skip a line using BufferedReader (skip, but not read it)
java,file,file-io,bufferedreader
If you care about the memory wasted in the intermediate StringBuffer, you can try the following implementation: public static void skipLine(BufferedReader br) throws IOException { while(true) { int c = br.read(); if(c == -1 || c == '\n') return; if(c == '\r') { br.mark(1); c = br.read(); if(c != '\n')...
Get Video File and save using c#
c#,asp.net-mvc-4,video,file-io
using system.IO; class program { static void main() { // Local Files File.Copy("path", "new Path"); } } ...
Binary Files in C++, changing the content of raw data on an audio file
What you did has nothing to do with binary files or audio. You simply copied the file while zeroing some of the bytes. (The reason you didn't zero all of the bytes is because you use i<strlen(buffer), which simply counts up to the first zero byte rather than reporting the...
Loading mixed numeric and string data
In cases where you absolutely don't know how to import your data, just use the Import Data GUI and generate a script. This is what you get for your case: %% Initialize variables. filename = 'C:\Users\Robert Seifert\Desktop\SO\data.txt'; delimiter = ','; %% Format string for each line of text: % column1:...
Read file, check correctness of column, write file C#
c#,visual-studio,file-io,delimiter
var oldLines = File.ReadAllLines(filePath): var newLines = oldLines.Select(FixLine).ToArray(); File.WriteAllLines(filePath, newLines); string FixLine(string oldLine) { string fixedLine = .... return fixedLine; } ...
java.nio.file.NoSuchFileException: why nio not creating file [closed]
Updated Answer: Now that you've shown the full code, there are two major problems: You're trying to open the file before ensuring that the directories leading up to it exist, and You're using StandardOpenOption.APPEND, but that won't create a file; it will append to an existing file. ...along with a...
How do EMACS Lisp programmers read text files for non-editing purposes?
I think a more direct translation of the original Python code is as follows: (with-temp-buffer (insert-file-contents "foo.txt") (while (search-forward-regexp "\\(.*\\)\n?" nil t) ; do something with this line in (match-string 1) )) I think with-temp-buffer/insert-file-contents is generally preferable to with-current-buffer/find-file-noselect, because the former guarantees that you're working with a fresh...
Reading only first integer from whole line in text file
You can ignore the rest of the line by using std::getline like that: settingsFile >> groupSize; std::getline(settingsFile, trash); settingsFile >> indTime; std::getline(settingsFile, trash); settingsFile >> newClientProb; std::getline(settingsFile, trash); settingsFile >> indTherapyCost; std::getline(settingsFile, trash); settingsFile >> groupTherapyCost; std::getline(settingsFile, trash); An alternative is to read the file line by line into a...
Algorithm to search regex pattern stuck for some txt
You have ł in regex. You must changing coding for Unicode or remove it. If that will not work, check this "stuck" files if they contain some strange characters.
PHP read txt from specific line to the end
I hard understand your question but maybe you want this. mensaxe will receive all items of array but 0 and 1 $mensaxe = array_slice($data, 2); You can trim all the array by array_map function: $mensaxe = array_map(trim, array_slice($data, 2)); UPDATE to output $mensaxe as a text, you can make string...
How to orchestrate members in a cluster to read new input from a single file once the current job is done?
As much as it pains me to suggest it, this might be the one good use of MPI "Shared file pointers". These work in fortran, too, but I'm going to get the syntax wrong. Each process can read a row from the file with MPI_File_read_shared This independent I/O routine will...
What is the best variant for appending a new line in a text file?
Using OpenOptions::append is the clearest way to append to a file: use std::fs::OpenOptions; use std::io::prelude::*; fn main() { let mut file = OpenOptions::new() .write(true) .append(true) .open("my-file") .unwrap(); if let Err(e) = writeln!(file, "A new line!") { println!("{}", e); } } Of note is that you must use both write and...
Wrong string concatenation using strcat
This is not a bug or problem, rather, an expected behavior. Please read on. fgets() reads and stores the trailing newline (\n). you need to remove (strip) that before storing the input. That said, please note: Please don't allow boundless increment of i when you have defined a fixed size...
Writing floats to a binary file in C++ | Equivalent of Java's DataOutputStream.writeFloat()
Java's default behaviour is to write files (and any other data streamed to IO) in big endian. C++ writes files in native format. On a standard x86-derived PC native is little endian, so for 0.5 you get: 0x00 00 00 3f in C++ and 0x3f 00 00 00 in Java....
Open,Close ObjectOuputStream but still want to Append the serialized objects tot the end ?
You can put the FileOutputStream into append mode for the second and subsequent writes, but you must also use an AppendingObjectOutputStream for the second and subsequent writes. You will find this class all over the Internet. It overrides writeStreamHeader() to do nothing. Otherwise you will get a StreamCorruptedException: invalid type...
Python - find recurring pairs/groups of values in dictionary
python,sorting,file-io,python-2.6
Assign a different prime number to every css property, like: { 'diplay: block': 2 'font-size: 10px': 3, 'font-family: Helvetica': 5, 'min-height: 1000px': 7, 'overflow: hidden': 11, 'width: auto': 13, 'background: white': 17, } Then make a dict where the keys are the css selectors (what you call "rules") and the...
File handling Code compiles but does not run
I don't remember which old compiler was able to run functions without prototype. But I'll ask you to use: void transfer(Student *); And Also change: void transfer(Student myList[]); To void transfer(Student *myList) Additionally, the First sscanf in while should be: sscanf(buf, "%d,", &myList[ctr].studentNumber); You used 0 instead of ctr. Edit:...
Non-OS Specific FD(File Descriptor) for C/C++
c++,design-patterns,asynchronous,file-io,network-programming
You cannot do that (getting a non-OS specific file descriptor, or portably dealing with network sockets without any OS support). File descriptors & network sockets are an Operating System specific thing (or in the POSIX standard). The C standard library (from C99 or C11 standards) does not know them. fileno(3)...
How can i access a js file in my project?
javascript,c#,c#-4.0,file-io,filestream
As your FileReader is reading from your build destination not your project destination, it will not find the file (Look at that path it tires to read from, it is .\bin\Debug\script1.js, where your file will be at .\script1.js) The easiest fix is to change build action for your script file...
How do I implement a timeout when using File.Copy?
For example, it can be done this way using async-await pattern: Task timeoutTask = Task.Delay(TimeSpan.FromSeconds(10)); // I use a completion source to set File.Copy thread from its own // thread, and use it later to abort it if needed TaskCompletionSource<Thread> copyThreadCompletionSource = new TaskCompletionSource<Thread>(); // This will await while any...
Why does command prompt show numbers before I begin?
Substitute printf("%d",&n); with scanf("%d",&n); printf Writes the C string pointed by format to the standard output (stdout) scanf Reads data from stdin In your code you are printing n, that is not initialized, that a random number is printed out after "Enter numbers to be stored in file" string....
Write to specific part of preallocated file
It's your file mode. File.open("file", "wb") "wb" means "upon opening, truncate the file to zero length". I suggest "r+b", which means "reading and writing, no truncation". Read more about available modes here: http://ruby-doc.org/core-2.2.2/IO.html#method-c-new BTW, "b" in those modes means "binary" (as opposed to default "t" (text))...
How to filter file paths then use the resulting paths
Let's take a look at the documentation for Result::unwrap: fn unwrap(self) -> T Unwraps a result, yielding the content of an Ok. Note how it takes self? That means that the option will be consumed. However, your iterator is passing the closure a &Result<T, _>. You can't take ownership of...
Hadoop map reduce Extract specific columns from csv file in csv format
java,hadoop,file-io,mapreduce,bigdata
You can Use Apache Pig to do Filtering and Validating Date format as well. Follow below steps : Copy your file into HDFS Load file using load command and pigStorage(). Select 20 column using ForEach statment (You can just give column name/number like $0,$3,$5..etc) Write UDF to validate date format...
event driven pattern for writing chunks to a file - JS
javascript,design-patterns,file-io,webrtc,event-driven-design
There is a way to do that without timeout, although it uses flag to indicate that writer is available, it still should be better than timeout loop. I would create queue where data chunks will be stored when it arrives and use async fileWriter (one that does callback when it...
C++ basic fileIO locations
The program tries to find the file you open in the current working directory, not from the location where the executable file is. When you're executing a program from a terminal the current directory is the directory you're in. So if you do e.g. cd ~/ to go to your...
In C, append to file open for read by another program on Windows console and Linux
The Linux/UNIX -tail command as described in the comments does not exist for windows, But yes, there are several ways to do this even without that command. Here is one that I have used, that should work cross-platform: First recognize you are describing a shared (file system) resource, that can...
fdopen: Invalid arguement
The a+ mode means append and read. Since you have initially opened the file in write-only mode (O_WRONLY | O_CREAT | O_EXCL), read access is not compatible with the mode of the initial descriptor. Therefore, the call to fdopen() rightfully fails with EINVAL....
How to output data to file in matlab?
When first time launching this file, be sure to select "change folder" instead of "adding file to path". When I selected "change folder" Matlab was able to write data in the 'output.txt' file. Also, as Dev-iL suggested I added append mode, final code looks like this function main clc; close...
Django views can't open .csv file by using pandas [IOError]
python,django,file-io,pandas,django-views
"Adding complete path and complete code in views.py, and I realized something, when I delete list function in views.py the graph worked just fine, I think there is a clash between list function and showimage function" Yes, indeed. Naming your view function list shadows the builtin type list in...
Haskell return lazy string from file IO
haskell,file-io,lazy-evaluation
You're right, this is a pain. Avoid using the old standard file IO module, for this reason – except to simply read an entire file that won't change, as you did; this can be done just fine with readFile. readCsvContents :: Filepath -> IO String readCsvContents fileName = do contents...
Writing in .txt without erasing the previous
These are the constructors on the java FileWriter 1.7 Constructor and Description FileWriter(File file) // Constructs a FileWriter object given a File object. FileWriter(File file, boolean append) // Constructs a FileWriter object given a File object. FileWriter(FileDescriptor fd) //Constructs a FileWriter object associated with a file descriptor. FileWriter(String fileName) //...
skip method in CipherInputStream
java,file-io,cryptography,inputstream
Found a solution that worked for me. Created a wrapper class that extended FilterInputStream and implemented the skip method using the same code found in InputStream.java Wrapper class public class SkipInputStream extends FilterInputStream { private static final int MAX_SKIP_BUFFER_SIZE = 2048; /** * Creates a <code>FilterInputStream</code> * by assigning the...
reading from txt file into dynamicly allocated
c,file-io,struct,dynamic-memory-allocation
For every number of s_person there needs to be memory allocated for name and array s_person* construct(int number){ int each; s_person *person = (s_person*)malloc(sizeof(s_person) * number); if ( person) { for (each = 0; each < number; each++){ person[each].name = (char*)malloc(sizeof(char) * 50); person[each].array = (int*)malloc(sizeof(int) * 2); } }...
Create file that the application can edit but the user cannot
Even encryption won't stop editing of the file by something other than your application. Can I suggest that one option is to simply store the data in binary format? You then save the complication of implementing an encryption, but still prevent any accidental editing of the file. You could also...
Ruby - How to subtract numbers of two files and save the result in one of them on a specified position?
Use something like this: lines1 = File.readlines('file1.txt').map(&:to_i) lines2 = File.readlines('file2.txt').map(&:to_i) result = lines1.zip(lines2).map do |value1, value2| value1 - value2 } File.write('file1.txt', result.join(?\n)) This code load all files in memory, then calculate result and write it to first file. FYI: If you want to use your code just save result to...
How to scan several drives for specific directories?
Try something like this: (as taken from MS code examples) public class StackBasedIteration { static void Main(string[] args) { // Specify the starting folder on the command line, or in // Visual Studio in the Project > Properties > Debug pane. TraverseTree(args[0]); Console.WriteLine("Press any key"); Console.ReadKey(); } public static void...
Reading file data into cell array of character strings
arrays,string,matlab,file-io,cell-array
importdata does that for you: >> x = importdata('file.txt'); x = 'ABCCD' 'HGAQ' 'VBSER' >> whos x Name Size Bytes Class Attributes x 3x1 364 cell ...
Java: Create Directory with Loop
Nowhere in your code have you specified the creation of the sub directories. Try something like: public class CreateDirectoryExample { public static void main(String[] args) { File worldDirectory = new File("C:\\Users\\xds\\Desktop\\world"); if (!file.exists()) { if (file.mkdir()) { System.out.println("World directory is created!"); } else { System.out.println("Failed to create World directory!"); }...
How to close an OutputStream in the appropriate way?
java,file-io,client-server,fileinputstream,fileoutputstream
The problem, I think, is that in after processing that command (GET) you are closing the server socket in that os.close() call. Realize that both os outputToClient and inputFromClient depend on the same server socket. Thus, when closing os you are impacting the other two streams. Then, after serving the...
NoSuchFileException when creating a file using nio
I would say that Turing85 was correct. Your filename_date variable has slashes in it. So /Users/jchang/result_apache_log_parser_2015 has to exist as a directory. That is the cause of the NoSuchFileException, missing directory.
Display an updated average of random numbers in a file
Even though it's kind of strange, what you are trying to do, and I'm sure there is a better way of doing it, here's how you can do it: float onTheFlyAverage() { static int nCount=0; float avg, newAvg; int newNumber = getRandomNum(); nCount++; //increment the total number count avg =...
C - dynamically modifying a file - is it possible?
What you want can be done using stdio and fseek(). As long as you know at what byte offset you want to go, you can overwrite and/or append anywhere in the file without reading the data before, or the data you're overwriting. What you can not easily do is insert...
Cannot access LocalFolder files on Windows phone app (UnauthorizedAccessException)
I guess you're not disposing the StreamWriter. See the example on MSDN. using( var writer = new StreamWriter(await file.OpenStreamForWriteAsync())) { writer.WriteLine("Hello World"); writer.WriteLine("Goodbye world"); } That's why your can't read the file, because it's already taken by SreamWriter....
Java FileOutputStream Created file Not unlocking
You are creating two instances of FileOutputStream and assigning both to out, but only closing one. Remove the second out = new FileOutputStream(new File(uploadedFileLocation));. Also, you should consider using a try-with-resources block private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) { try (OutputStream out = new FileOutputStream(new File(uploadedFileLocation))) { int read =...
C++ and WinApi - usage of GetWindowText() to get parameters for C++ code
You need to properly handle WM_KEYDOWN, not WM_COMMAND, because windows receives WM_KEYDOWN after key is pressed and WM_COMMAND after variuos of events. case WM_KEYDOWN: { if(wParam == VK_RETURN) { DWORD dlugosc = GetWindowTextLength( g_hText ); LPSTR Bufor =( LPSTR ) GlobalAlloc( GPTR, dlugosc + 1 ); GetWindowText( g_hText, Bufor, dlugosc...
Does separating read/write operations improve program efficiency?
java,algorithm,performance,file-io,data-structures
This depends on the way you implement parallelism in your data crunching part. At the moment you sequentially read everything - then crunch the data - then write it. So even if you broke it into 3 threads each one depends on the result of the previous. So unless you...
Taking a file and splitting it into 2 groups
In case you ever have to break out more groups, you may want to consider storing your groups in a Dictionary<string, List<string>>, where the key is the group name and the value is the List containing only the group data. UPDATE If I'm understanding the scenario, say you have data...
When I write to two files in python, the second one is always empty
I'm guessing here, but your problem is likely that stuff1 and stuff2 are pointing to the same generator or iterator, and you can only iterate through once. After that, its contents are exhausted. Try this instead: import itertools stuff1, stuff2 = itertools.tee(the_source_generator_or_iterator_or_whatever) with open('file1.txt', 'w') as file1: for thing in...
FileOutputStream writing less than it should
java,file,file-io,fileoutputstream
Make sure to always invoke the close() method of the output stream. This makes sure all buffered data are written to the stream. Also if you're writing characters, it's more convenient to use a FileWriter instead....
dojo 1.10 How to read text file a user has picked with a file picker
I got this to work. Just sharing the solution for the benefit of others. Technologies used: Jersey 2.x Jackson 2.4.x Jetty 9 Java 8 Dojo 1.10.x Below is the HTML <form> containing the dojox.form.Uploader, allowing the user to pick a file to upload. Note that uploadOnSelect is set to false...