qt Archives

2019-09-082019-09-08

SignReport, a Tool for Batch Verification of PE Signatures

Code signing is one of the most popular ways of confirming the integrity of software packages. This is made possible by the author of the PE (such as *exe, *.dll and so on) using a Sign tool to add their signature (a certificate) to the PE file. Checking the signature of PE files on the other hand can be done by using WinVerifyTrust function. This example demonstrates how WinVerifyTrust can be used. In this post I’ll share the slight changes needed to make WinVerifyTrust work with Qt Framework, along with a tool built with Qt Framework, that can be used to verify the signature of all PE files within a chosen folder.

2019-07-282019-07-28

Creating a Skybox Using C++, Qt and OpenGL

Skyboxes are commonly used in video games to create a realistic and wide sense of environment. In addition, they can be used to display 360 degree panoramic images, which is the reason why Computer Vision enthusiasts like myself are interested in this topic. To create a Skybox, you need a set of 6 images that correspond to the 6 sides of a cube. In this tutorial, we’ll learn how to create a Skybox using Qt with OpenGL.

2019-07-122019-07-12

Using OpenGL in Qt for Processing Images

Utilizing the power of the GPU, and OpenGL in particular, for Computer Vision and Image Processing purposes has always been a favorite topic of mine. It’s quite easy to find many examples around (even among official Qt example projects) to deal with and learn more about this topic but I figured there are no clear and step by step examples for people who are absolutely new to it. This post aims to cover a number of topics, including the following, in a step by step and simple manner:

How to use QOffscreenSurface class for off-screen rendering using OpenGL
How to use QOpenGLFramebufferObject to create Frame Buffer objects
How to use Vertex Shaders to perform Geometric Image Transformations
How to use Fragment Shaders to perform Image Filtering and per-pixel operations
How to convert a texture to QImage

2019-07-032019-07-03

Deploying Qt+OpenCV Applications on macOS

Qt provides an extremely simple mechanism for deploying applications on macOS, thanks to macdeployqt tool. Unfortunately, the same does not apply to Qt for macOS applications that reference 3rd party libraries such as OpenCV. In this post, I’ll describe the manual but simple process of adding 3rd party libraries into macOS Application packages in order to eliminate the need for installing those libraries on our target computers.

2019-06-292019-06-29

Qt Installer Framework – How to Run an Executable During Installation

Qt Installer Framework provides a simple way of creating cross-platform installers and setup files. Some of the questions that are asked quite a lot, but unfortunately are not as well-documented as they should be, is about the “Execute” method which is used to run executable files during installation. In this post I’ve tried to clarify a couple of points about it with a couple of simple examples.

2019-06-292019-06-29

Configuring Qt for Windows Projects to Use OpenCV 4.1.0

I usually build OpenCV with the BUILD_opencv_world option which makes it quite easy to configure my Qt projects and work fast. But when it comes to deploying OpenCV powered applications, I still prefer to use the modular and default OpenCV build in order to deploy only the required DLLs and end up with a smaller installer file size.

2019-06-232019-06-23

Working with Windows Registry Using Qt

In this post I’ll describe the way to deal with Windows Registry in terms of writing and reading Registry Keys. This is done using QSettings class in general, so let’s see how, with a couple of simple examples.

2019-06-212019-06-22

How to Create AndroidManifest.xml Using Qt Creator

Android Qt projects require AndroidManifest.xml file for a a number of reasons, including the definition of required permissions and so on. Creating this file on the other hand, and adding it to your Android Qt project requires a few strict instructions that are provided in this post.

2019-06-202019-06-20

Implementing Minimize To Tray Functionality Using Qt/C++

I wanted to create my own personal stand-alone YouTube Player with Minimize to System Tray functionality. In other words I wanted it to be minimized to the System Tray when I closed it and displayed again when I clicked its icon in System Tray. I actually did it the other day and the whole thing led to this post. So, in this post I’ll describe How to use Qt/C++ to create your own YouTube Player with Minimize to Tray functionality in less than 10 minutes.

2019-06-082019-06-08

How to Build and Use OpenCV 4 with Qt5 in macOS Mojave

This guide is quite similar to my previous How-Tos about building OpenCV from source codes and using them in Qt, but I wanted to created a fresh one and point out a few of the changes made in this recent OpenCV version that requires you to reconfigure your Qt projects just a bit.