04 Apr 2025

C language file operation: Read file introduction File processing is a crucial part of C language programming, which allows programs to interact with external storage devices such as disks and flash drives. This article will explore how to read files in C language. Steps to read a file to open the file: use the fopen function to open the file. This function requires two parameters: file name and open mode. Check whether the file is open: Check whether the pointer returned by the fopen function is NULL. If NULL, the file cannot be opened. Read file: Use the fread function to read data from the file to the buffer. This function requires four parameters: buffer address, buffer element size, number of elements to be read, and file pointer. Close the file: Use f

04 Apr 2025

C language file operation: Processing temporary files Temporary files are temporary files used to store temporary data. In some cases, this is very useful when you need to store some data that needs to be deleted later. In C, you can use the tmpfile() function to create temporary files. This function returns a FILE pointer to a temporary file, which will be automatically deleted when the program exits. For example, the following code creates a temporary file and writes some data: #include#includeintmain(){FILE*fp;fp=tmpfile();if(fp==NULL){

26 Aug 2025

This article aims to guide readers how to perform basic text file writing operations in Go language. By comparing the use of FileWriter and BufferedWriter in Java, we will explore in-depth the file operation interface provided by the os package in Go language, especially the application of os.Create, WriteString and Go-specific defer statements in resource management and error handling. This tutorial will provide detailed code examples and best practices to help developers efficiently and safely implement file IO functions, especially suitable for developers with Java background to quickly get started with Go file processing.

25 Aug 2025

This tutorial details how to use PHP for file operations, including reading data from files, processing data (such as numerical calculations and conditional judgments), and writing processed results to a new file. Through a specific grade processing example, you will learn how to use core functions such as file(), fopen(), fwrite() and fclose(), and master key techniques such as data type conversion, loop traversal and file flow management when processing file content.

17 Apr 2025

I'm having a tricky problem when developing a PHP project that handles file uploads: How to map the MIME type of a file with its extension exactly? This problem not only affects the identification of files, but also leads to confusion in data processing. After trying multiple methods, I found the fileeye/mimemap library, which not only solved my problem, but also greatly improved the processing efficiency.

24 Aug 2025

This tutorial explains the core practices of file read and write operations in PHP in detail. Through a specific grade processing case, it demonstrates how to use the file() function to read file contents into an array, perform data type conversion and business logic processing, and then use fopen() and fwrite() to write the processed data into a new file. It emphasizes the importance of file handle management and error handling, aiming to help developers build robust file operation scripts.