Learn C Files I/O: Create, Open, Read, Write and Close a File @ProgrammingKnowledge

ProgrammingKnowledge | Learn C Files I/O: Create, Open, Read, Write and Close a File @ProgrammingKnowledge | Uploaded February 2024 | Updated October 2024, 5 days ago.
Learn C Files I/O: Create, Open, Read, Write, and Close a File | File Handling in C Tutorial

Welcome to our comprehensive tutorial on File I/O in the C programming language! In this guide, we will walk you through the fundamental concepts of handling files in C, covering the essential operations of creating, opening, reading, writing, and closing files.

📁 **File Handling in C - An Overview:**
Understand the importance of file I/O in C programming, enabling you to interact with external files for data storage, retrieval, and manipulation.

🚀 **Key Concepts Covered:**
- **Creating a File:** Learn how to create a new file in C, allowing you to store information in a persistent manner.
- **Opening a File:** Explore the process of opening an existing file for various operations, such as reading or writing data.
- **Reading from a File:** Understand how to read data from a file and incorporate it into your C program.
- **Writing to a File:** Learn how to write data to a file, enabling you to store program output or save user input.
- **Closing a File:** Explore the importance of properly closing files to ensure efficient resource management.

📝 **Step-by-Step File I/O Process in C:**
Follow our detailed instructions and examples to gain hands-on experience with file I/O in C. From creating and opening files to reading and writing data, we'll guide you through each step of the process seamlessly.

⚙️ **Advanced File Handling Concepts:** Delve into advanced file handling concepts, including error handling, positioning within a file, and working with binary files.

👩‍💻 **Coding Exercises and Examples:**
Enhance your understanding of file I/O in C through practical coding exercises and real-world examples. Apply what you learn to solidify your skills.

📌 **Relevant Hashtags:**
#CProgramming #FileIO #ProgrammingTutorial #CFiles #CodeExamples #TechHowTo #LearnProgramming #TechEducation

Dive into the world of file handling in C! Watch the tutorial, follow the steps, and master the art of creating, opening, reading, writing, and closing files in the C programming language. Hit play now and elevate your C programming skills! 📁💻🚀

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$How to Add GitHub OAuth2 Login in Node.js | GitHub OAuth2 Authentication with Passport.js (2024) **Title: How to Add GitHub OAuth2 Login in Node.js | GitHub OAuth2 Authentication with Passport.js** https://github.com/harshita795/github-auth-app In this tutorial, learn how to set up GitHub OAuth2 login in your Node.js application using Passport.js. GitHub authentication is a powerful way to allow users to log in using their GitHub accounts, enhancing security and user experience. We’ll go step-by-step through setting up OAuth2 in GitHub, configuring Passport.js in Node.js, and implementing login functionality. By the end of this video, you’ll have a fully functional GitHub OAuth2 login integrated into your Node.js app! ### Prerequisites: - Basic knowledge of Node.js and Express.js - GitHub account to create OAuth app - Passport.js installed in your project ### Steps to Implement GitHub OAuth2 Authentication in Node.js: #### 1. **Set Up GitHub OAuth App**: - Go to [GitHub Developer Settings](https://github.com/settings/developers). - Click **New OAuth App**. - Fill in the details: - **Application name**: Give a name to your app. - **Homepage URL**: Enter the URL where your app is hosted (localhost for local development). - **Authorization callback URL**: `http://localhost:3000/auth/github/callback` (or change the port if your app uses a different one). - Click **Register Application** and take note of your **Client ID** and **Client Secret**. #### 2. **Install Required Packages**: - Open your project in the terminal and install Passport and GitHub strategy: ```bash npm install passport passport-github2 express-session dotenv ``` #### 3. **Configure Passport.js with GitHub Strategy**: - In your main server file (e.g., `app.js` or `server.js`), require and configure Passport: ```javascript const passport = require(passport); const GitHubStrategy = require(passport-github2).Strategy; const session = require(express-session); require(dotenv).config(); app.use(session({ secret: your_secret_key, resave: false, saveUninitialized: true, })); app.use(passport.initialize()); app.use(passport.session()); ``` - Set up Passport’s GitHub strategy: ```javascript passport.use(new GitHubStrategy({ clientID: process.env.GITHUB_CLIENT_ID, clientSecret: process.env.GITHUB_CLIENT_SECRET, callbackURL: http://localhost:3000/auth/github/callback }, (accessToken, refreshToken, profile, done) = { // Here you would find or create a user in your database return done(null, profile); } )); passport.serializeUser((user, done) = done(null, user)); passport.deserializeUser((obj, done) = done(null, obj)); ``` #### 4. **Set Up Routes**: - Define routes for authentication: ```javascript // Redirect to GitHub for authentication app.get(/auth/github, passport.authenticate(github, { scope: [user:email] })); // GitHub callback URL app.get(/auth/github/callback, passport.authenticate(github, { failureRedirect: / }), (req, res) = { res.redirect(/profile); // Redirect to profile page after login }); // Route to log out app.get(/logout, (req, res) = { req.logout(); res.redirect(/); }); ``` #### 5. **Create Profile and Logout Pages**: - Set up a profile route to show user information: ```javascript app.get(/profile, (req, res) = { if (!req.isAuthenticated()) return res.redirect(/); res.send(`Hello, ${req.user.username}!`); }); ``` #### 6. **Set Environment Variables**: - In a `.env` file, store your GitHub Client ID and Client Secret: ```plaintext GITHUB_CLIENT_ID=your_client_id GITHUB_CLIENT_SECRET=your_client_secret ``` #### 7. **Test GitHub Login**: - Start your Node.js server and go to `http://localhost:3000/auth/github`. - You’ll be redirected to GitHub to authorize access, and then back to your app’s profile page once authentication is successful. ### Summary: After setting up these steps, you’ll have GitHub OAuth2 login functionality integrated with Passport.js in your Node.js app. You can now allow users to log in with their GitHub credentials securely! ### Troubleshooting Tips: - **Invalid Callback URL**: Make sure the callback URL in GitHub OAuth App settings matches the callback URL in your code. - **Environment Variables Not Loading**: Verify your `.env` file and make sure you’re using `require(dotenv).config()` at the top of your main file. **Helpful Resources**: - GitHub OAuth Documentation: [GitHub OAuth](https://docs.github.com/en/developers/apps) - Passport.js Documentation: [Passport.js](http://www.passportjs.org/) #GitHubOAuth #NodeJS #PassportJS #Authentication #GitHubLogin #WebDevelopment #OAuth2 #NodeJSTutorial #JavaScript$

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