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  catalogue Background introduction Functional comparison Introduction to common classes of database operation in QT Usage example Data preparation Create entity class Create database access class Personal summary About how to get errors in database execution and judge whether SQL statement execution is successful About parameterized ...

[Write before] QTimer in Qt is fairly simple and powerful. However, you have recently encountered a number of problems using QTimer without the Qt thread. Read the document carefully and discover details you don't notice (I'm silly T.), which require a cycle of events: In multithreaded applications, you can use QTimer in any thread that ...

1. Concepts ComboBox is a combination of buttons and pop-up lists. It provides a way to display a list of options to the user, which takes up the least screen space. ComboBox is populated with data models. Data models are usually JavaScript arrays, ListModel s, or integers, but they also support other types of data models. ComboBox { x:200 ...

I mainly use the serial port class here. The function is to open the serial port read and write, click the Send Data button to send the data of the sending area to the buffer, and then display it in the receiving area. The interface is as follows: (Source code can be in Here Download)                                                         ...

1. Preface Since the smartphone era, a wide variety of APP s have flourished. Apps on mobile phones have many popular elements. Switch buttons are very liked by individuals. Mobile phones QQ, 360 Guards, Jinshan Toxinba, etc. have many switch controls for some operations. On WINFORM projects, if Check ...

This tutorial demonstrates how to integrate GStreamer into a graphical user interface (GUI) toolkit like GTK +. Basically, GStreamer is responsible for media playback, while the GUI toolkit handles user interaction. The most interesting part is that the two libraries must interact: instruct GStreamer to ...

1, Write in front As a test, sometimes it is often necessary to record their own operation on the screen, so as to facilitate the follow-up development and positioning of students. In the past, screen to GIF was used to record the screen and make dynamic pictures. Occasionally, python can also be realized. Then hurry to learn. 2, Effect display ...

Use background With the increase of development projects, the business structure is more and more complex. In order to improve the development efficiency of programmers and reduce the maintenance cost (code readability), using MVC (MVD) mode in QT is an effective method. Customizing the Model is the first step in using the MVC pattern. How t ...

I. Preface In the related projects of map application, some equipment points are identified on the map, and the function of point interaction is most used. Therefore, a set of mechanism is needed to dynamically add, delete, clear and reset. Reset means to reset the longitude and latitude of all points in the map. In fact, it means to first clea ...

Description: At the beginning, I want to realize that there are multiple editable controls (such as QLineEdit, QTextEdit, etc.) on a form. When which control gets the focus, the background of which control will be highlighted to prompt. I found out that the document should use focusInEvent() and focusOutEvent(). In the actual p ...