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Introduction In world of computer programming, an ELF (Executable and Linkable Format) file is a binary file format used in Unix-based operating systems such as Linux, FreeBSD, and Solaris. These files contain executable code and data, which are used to launch programs and libraries. In some cases, however, ELF files may contain many zero bytes. In this article, we will explore why ELF files may contain many zero bytes, their impact on programs, and how to fix this issue. Why ELF files contain many zero bytes? An ELF file consists of a header followed by sections containing executable code, data, ... Read More
The LAMP environment is widely used for web development, and it is an acronym for Linux, Apache, MySQL, and PHP. This environment is an open-source platform that is easy to use and deploy. PDF format is commonly used for sharing and exchanging documents over internet. However, generating PDF documents can be a challenging task in a LAMP environment, especially when converting XHTML documents. In this article, we will explore different methods used for PDF generation from XHTML in a LAMP environment. What is XHTML? XHTML stands for Extensible Hypertext Markup Language, which is a markup language that is used to ... Read More
Introduction Xvfb stands for "X Virtual Frame Buffer" which is used to create a virtual display in memory without any attached physical display device. It allows running graphical applications without any actual graphics hardware. PHP is a server-side scripting language widely used for web development. In this article, we will discuss how we can use Xvfb with PHP to run graphical applications in headless mode. Why do we need Xvfb with PHP? PHP is a server-side scripting language and doesn't provide any direct support for graphics and user interfaces. Most of PHP-based web applications are built on top of popular ... Read More
Qt is a cross-platform application framework that is widely used for developing applications with graphical user interfaces. It is written in C++ and supports a range of programming languages, including Python, Ruby, and Java. One of most useful features of Qt is its support for internationalization, which allows developers to create applications that can be easily localized for different languages and cultures. In this article, we will discuss how to run a Qt app in a different language. Introduction to Internationalization Internationalization, also known as i18n, is process of designing and developing applications that can be easily localized for different ... Read More
Let us first understand some basic concepts and equations based on which the projectile motion can be modelled. The figure shown below explains some basic terminologies of projectile motion. Here, "u" is the velocity with which the projectile is being projected. š¯›¼ is the angle of projection of the projectile. The path taken up by the projectile during its flight. Range is the maximum horizontal distance travelled by the projectile. $\mathrm{h_{max}}$ is the maximum height attained by the projectile. Moreover, the time taken up by the projectile to travel the range is called as time of flight. The projectile ... Read More
Eclipse is one of most popular Integrated Development Environment (IDE) used by millions of developers around world. It provides a comprehensive set of tools and features for developing Java applications, web applications, and other software projects. However, like any software, Eclipse may encounter issues and errors that can prevent it from starting up via an application launcher. In this article, we will discuss some common causes of Eclipse startup failure and how to troubleshoot them. Possible Causes of Eclipse Startup Failure Corrupted Installation One of most common reasons why Eclipse fails to start is a corrupted installation. This could be ... Read More
Introduction Linux is an open-source operating system that is popular among developers and system administrators. It is known for its flexibility, reliability, and security features. One of features that make Linux stand out from other operating systems is its ability to interact with various hardware components seamlessly. In this article, we will discuss whether Linux emits events when a monitor is connected with a D-sub connector. We will explore various methods that can be used to detect and manage connection of monitors to Linux-based systems. What is D-sub connector? Before we dive into details of how Linux interacts with monitors ... Read More
Networking and microcontrollers have become ubiquitous in modern world, with demand for connected devices and smart homes on rise. If youā€™re looking to expand your knowledge on these topics, there are a plethora of books that can help you gain a better understanding of networking and microcontrollers. In this article, weā€™ll explore some of best books to read on networking and microcontrollers, along with their examples and sub-headings. "TCP/IP Illustrated, Volume 1: Protocols" by W. Richard Stevens TCP/IP Illustrated is a comprehensive guide to TCP/IP protocol suite, which is foundation of internet. This book covers all aspects of TCP/IP protocol, ... Read More
Introduction Java Native Access (JNA) is a Java library that provides an interface for accessing native code from Java programs. It enables developers to use functionality of native libraries or applications without need to write native code or deal with complexity of C or C++ programming languages. On other hand, process execution refers to creation of new processes in operating system. In this article, we will discuss advantages of using JNA over process execution, along with some examples. Improved Performance One of main advantages of using JNA over process execution is improved performance. When using process execution, a new process ... Read More
Introduction When working with ARM-based Linux systems, one of critical functions that programmers often need to use is mprotect. This function is used to protect specific areas of memory from unauthorized access, modifying or executing. However, one of common questions asked by developers is whether mprotect flushes instruction cache on ARM Linux. In this article, we will explore concept of mprotect and its impact on instruction cache on ARM Linux. We will also discuss some examples and scenarios that can help you understand function better. What is mprotect? Mprotect is a function that allows programmers to modify memory protection settings ... Read More