Questions tagged [file-handling]

File handling refers to the set of tools, functions, and libraries to work with files and file handles. Creating, writing, appending, moving, and deleting files fall in this domain.

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How best to keep Excel Workbook field in sync across class instances

I know almost nothing about threads, synchronization, ... That being said, I am working on a record handler, that hits Excel sheet to pull/push data. There exist, in my code base, a BaseRecordHandler, ...
-1 votes
2 answers
171 views

Dealing with multiple application instances

I'm developing an application (Java & JavaFX) that writes/reads data (a file). The problem is I don't want to restrict user to run only one instance (of my app) at a time, as I really can't think ...
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2 answers
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Transferring data from 1 web app into another offline

I have a web app that will be used locally on 2 different site. The program is a Vue web app made with node.js and express, using MySQL database. Due to limitation (no internet in site 1), there is no ...
0 votes
1 answer
143 views

How does resuming downloads work?

I have seen download managers manage to resume HTTP downloads from where they stopped. How are they able to resume downloads? Is it related to the Accept-Range Header? Or are there other mechanisms ...
0 votes
1 answer
81 views

Efficient way to separate text file to header, tail lines and the leftover in between

I'm looking for a more efficient algorithm for the following problem: The input of the algorithm is a text file and two non-negative integer numbers - the number of headers and the number of tails. ...
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0 votes
1 answer
325 views

Constantly writing a JSON file [closed]

I need to write continuously into a JSON file in C++. The format and structure are defined as requirement. The data is produced in the process itself and needs to be stored multiple times per second. ...
0 votes
0 answers
26 views

Sync image files from network with mariadb-Database

i have as a mechanical engineering student in my practice semester to create a database that includes about 100k+ paths to images in our network. Every, lets say week, i have to synchronize all ...
1 vote
0 answers
60 views

Inter-Process Communication: Stream data from single writer process to multiple reader processes

tl;dr - I want to stream text data from one writer process to multiple reader processes. I'm thinking of using a file to achieve this. Is it a good idea? Using a file would avoid having to maintain ...
-3 votes
1 answer
93 views

Serving large file (dozens of GB) to client from a server-side query to the Azure SQL database?

I have an SQL database in Azure that is ~4.5 TB / 150 million rows worth of data. Users will need to query this database for large sets of data. Right now, I am having users submit their requests ...
1 vote
0 answers
120 views

How to (simply) architecture a way to ingest multiple types of large files, process them, and send data in chunks to web services?

Note: All of this would be in AWS Hi everyone, What would you guys suggest for building something that: Takes in several different input file types (ex: csv, json, jsonl, xml, .gz, ...) That can be ...
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3 votes
1 answer
961 views

Is there a standardised way of adding custom metadata to image and other filetypes?

What's a good way of storing and referencing files of different types (csv, pdf, jpg, html), each of which needs my own custom metadata? The metadata stores details of the content and how it was ...
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1 vote
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Streaming File Storage in Distributed (and Containerized) Systems

I'm trying to implement a system that allows a user to upload files over HTTP, saves the file to object storage as well as any metadata surrounding the file that already exists to a NoSQL database (i....
6 votes
4 answers
453 views

First time having users - how to deal with backwards compatibility?

I'm reaching out with the following situation: I'm the author of an application that saves a file format to disk. There are real users using the application in their workflows. Frequently, I want to ...
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0 votes
1 answer
84 views

Best technique for sending multiple files in a single JSON post with Vue/javascript?

Using Vue/Electron to post to rails/Postgres backend. Is there a common design pattern/approach to posting multiple audio file objects BUT in a single post request? My current process (which works, ...
0 votes
1 answer
2k views

How to determine ideal chunk size for file writing?

I have a class that is responsible for writing formatted binary objects to a file on a network drive with a 100Mbps bandwidth. Each time an object is created (via lets call it w.addObj()) it formats ...
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0 votes
1 answer
270 views

designing a secure/encrypted file storage for a multi-tenant saas app with local and cloud storage in mind

as the title suggest, I need to handle the tenant files in a multi-tenant saas app. fairly common scenario I believe and should have been solved by the gurus already. right now the app is in infancy ...
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-4 votes
1 answer
408 views

Better way to process huge files

I have a huge csv file and I have to process that file and do some data manipulation. Right now I'm reading/loading the file in buffer and then doing the data processing work. I find this approach ...
3 votes
5 answers
334 views

Applying function to file line by line or read entirely into structure first?

I've often found myself with the need to develop tools that process large files over a network and perform an operation to every element in that file. An element may be an individual line or an object ...
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0 votes
1 answer
48 views

Test logging library

I've been designing and developing a very scalable logging library for a while. The main goal of this library is pretty simple. Like many others projects, a simple goal does not mean a simple way the ...
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-2 votes
1 answer
1k views

Generate large Excel files and response from API

I need to generate a large Excel file (something around 50 megs) and send response to another API which will provide it to the front end for a download option. My question is if it will be better to ...
1 vote
1 answer
229 views

How is a software able to read a network file faster than it appears to be possible?

Note this is a general, conceptual question about performance optimization. motivated by the following real-world case. I have a file on a Windows network drive that has a 100Mbps limt; it is a ...
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0 votes
1 answer
69 views

database implementation, how to organize files

I try to build a very small object database, not for production only to learn a bit in my spare time. I've got a data structure that saves my data in blocks of a specific size und combine them when ...
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2 votes
0 answers
47 views

What is the most efficient way to find filesystem changes in percentage?

I am planning to write a program that will produce digest logs for file changes in a particular directory. The idea is that whenever a file is deleted in a particular directory, it will show up in the ...
0 votes
1 answer
22 views

Set per-process open file limit in code or in system configuration?

I am working on an internal application that is maintained by the same people that operate the servers the application runs on. We have noticed, while transitioning from Windows to Linux, that some ...
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3 votes
1 answer
1k views

Design of file I/O -> processing -> file I/O system

I'm in the process of designing a new desktop application which is very different from other stuff I did before, and so I'll be happy if I could be pointed towards the right direction regarding the ...
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0 votes
1 answer
963 views

Getting file format by checking file header [closed]

I'm writing a program, part of which consists of determining if a given file is a PNG. Knowing that a file doesn't have to be named with its respective filename extension to be of a certain type, I ...
1 vote
1 answer
189 views

How to access a file stored locally on server?

I am working on a web application which allows users to review pdf documents. These documents are submitted from another public facing website. A typical workflow involves: A document is uploaded on ...
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0 votes
1 answer
1k views

How should I separate File Parse Classes?

I want to understand different ways to object design classes. I have three different classes. Generally I am creating a file parser. The classes: CustomerData - which shows text Data Model. A File ...
2 votes
0 answers
67 views

How to write disk benchmarking software?

I am coding a disk (HDD/SSD) benchmarking software. I have a few questions on how a disk should be benchmarked (regardless of programming language used). This is my pseudo code for testing sequential ...
0 votes
3 answers
157 views

How do I deal with file downloads?

I'm currently working on a script (in PHP, but I'm not sure if that's relevant here) which allows users to set up a simple file-sharing system on their server. I'm stuck when trying to figure out how ...
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0 votes
1 answer
115 views

Creating data files inside a package

I'd like to deploy my code to a web server as a package. There Python is subprocessed and scripts are executed. These scripts use data files. But in case a file is needed and it doesn't exist, it ...
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0 votes
2 answers
96 views

Class design : Decide between file and database for storage during runtime [closed]

Based on the demo or license version of my application, I am supposed to either save the data to a file (xml) at a specific location or a relational database. What should be my approach for this case ...
6 votes
2 answers
2k views

How to deal with file events with microservice that exposes a REST API

A bit of context. The company where I work is starting to transition to a modular architecture (something similar to microservices) for our main product, currently monolithic. The first step is to ...
3 votes
0 answers
674 views

File upload sync for offline desktop application. (Electron)

We are making an offline desktop application in Electron that needs to sync when the user goes online. Sqlite is used as the database when offline and it gets synced to postgres on the server when ...
1 vote
1 answer
180 views

How to scale a file based process

I'm looking for a method to solve the following problem: Assume there is a spool directory with a lot of files that need to be processed. There is a process A that is constantly writing new files to ...
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7 votes
2 answers
1k views

What is constraining cross-platform asynchronous file I/O?

Looking at a range of cross-platform languages, libraries and GUI toolkits, I often notice a conspicuous absence of support for asynchronous file I/O. This seems like too much of a common factor to be ...
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0 votes
1 answer
1k views

An elegant way to detect the end of an asynchronous recursive file search?

Given a recursive subroutine in single threaded environment which starts numerous asynchronous I/O operations and registers callback functions for each of them. This callbacks will be called on the ...
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-4 votes
2 answers
360 views

Why aren't directories for files created automatically? [closed]

One of the most annoying boneheaded bugs I run into is trying to create a new file in a directory that does not exist. (At least on Windows/NTFS, not sure about other OS/FS combinations.) Here's how ...
-5 votes
1 answer
183 views

Right Click SaveAs and Open C# Application [closed]

I am wanting to develop a C# application that would allow me to right click on a file and choose an option within the context menu to perform a save as with a date time stamp and then open the newly ...
2 votes
1 answer
7k views

Storing images in base64 vs binary, in cloud

I'm developing a photo sharing website. Currently, the way I wrote it, a user uploads a photo (jpeg), which is read in as a Base64URL (using FileReader). The backend (Django) uploads this file to ...
9 votes
3 answers
514 views

Writing at the start of a file something you only know at the end

Background: I'm writing micro controller C code to write an EBML file. EBML is like a binary XML with nested elements, but instead of start and end tags, there is a start ID, length, and then the data....
3 votes
2 answers
697 views

REST API with files as resources?

I'm storing files as REST API resources, sending and receiving them as base64 strings, along with some other metadata. What's the best way to handle GET for the collection? (e.g GET .../api/files) ...
21 votes
1 answer
30k views

Why would anyone use multipart/form-data for mixed data and file transfers?

I'm working in C# and doing some communication between 2 apps I'm writing. I have come to like the Web API and JSON. Now I am at the point where I am writing a routine to send a record between the two ...
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11 votes
1 answer
29k views

Base64 in Json: Is it a Good Idea for Rest API?

I am developing a Rest API, and I am asking myself: Is it a good Idea to put base64 encoded data in Json, e.g. for file uploads? What if the base64 contains some of {,},: characters and breaks the ...
2 votes
1 answer
336 views

How is persistence-ignorance relevant to a file format–centered application?

I have a small side-project of about 3,000 sloc. I'm experimenting with building a DDD-like domain model into it, so I have more experience with this style for work. The project is centered around ...
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0 votes
1 answer
978 views

What's the best way to do horizontally scalable file uploads?

In general, how do websites handle file uploads when they scale horizontally? Obviously if you have a load balancer going to 10 application servers, and each application server just saves an upload ...
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3 votes
2 answers
271 views

Dealing with potential failures when appending data to a file on disk

I'm designing an application that will be appending blobs to a file on disk (local filesystem) and I'm currently thinking of how to deal with consistency issues that could occur if: The application ...
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10 votes
4 answers
8k views

Is it bad practice to read large file in constructor?

So, I am trying to create an English language trie data structure implementation in C++. I have created a Trie and TrieNode class. The TrieNode class takes in its constructor a vector<string> ...
1 vote
0 answers
528 views

I want to write an application to compare files, similar to WinMerge. I'm not sure how to design it, though

My current project is to implement a kind of WinMerge clone to compare two files. I am using C++ with the Win32-API (WTL, ATL, that stuff), and I already designed an UI for this. However, I am now ...
3 votes
4 answers
889 views

Would you use Byte Arrays or XML if size was not an issue?

In my basic understanding of ByteArrays the benefit is that it is smaller in file size. The down size of a ByteArray is that for any given format you have to know the about the file format to get ...