DmitrijDec. 10, 2022, 1:50 p.m.

QtHow to open image with correct orientation with Qt tools

QImageReader, поворот изображения при загрузке, QImageWriter, поворот изображения, метаданные jpg

Some popular image formats (like jpg) may contain metadata. One of them is rotation. If you create the file in a graphics editor, then rotate it in the viewer, and finally load it into your application using the QImage, QPicture, …

Evgenij LegotskojOct. 16, 2022, 3:58 p.m.

Djangodjango_model_cached_property - Caching property for individual model objects in Django

cache, model_cached_property, invalidate, redis, Python 3, Django

Introducing the release of the stable battery django_model_cached_property for caching property for individual model objects in Django.

I already said that evileg_core contains similar functionality, but now I decided to bring this caching into a separate package. This is due …

DmitrijSept. 7, 2022, 2:40 p.m.

C++Engineering solution of a cubic equation using Vieta's trigonometric formula

кубическое уравнение, unique_ptr, компьютерная математика, полиномиальное уравнение, тригонометрическая формула Виета

As you know, the solution of the cubic equation has been known since the 16th century. However, even today, engineers can face a problem in solving it. This complexity is due to the need to extract the root from complex …

Evgenij LegotskojSept. 5, 2022, 3:45 a.m.

DjangoAnalysis of errors in the development and promotion of a site on Django - Custom tag<cut>

development, Django, Custom

And now some thoughts on the topic of custom tags, and whether they should be introduced at all.

The short answer is NO.

Now let's think about this topic - "Why?" . There is such a well-known Russian-language resource Habr, …

Evgenij LegotskojSept. 2, 2022, 6:06 a.m.

DjangoAnalysis of errors in the development and promotion of a site on Django - Multilingual forms

forms, Мультиязычноть, Django, Translations

With this publication, I would like to start sharing my observations after almost seven years of supporting the EVILEG project. So that every newbie could roughly understand and imagine whether it is worth doing a similar or different functionality or …

sonia jessicaJune 21, 2022, 3:34 a.m.

JavaJava Array Programs

Java, Interview

Arrays in java:

  • An array is the basic Data Structure that contains items of similar data types.
  • There is always an ordering amongst the position of the element.
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Evgenij LegotskojJune 13, 2022, 5:15 a.m.

C++Leet Code Solutions - 003 - Longest Substring Without Repeating Characters

cpp, LeetCode, C++, C++17, string

Solution "Longest Substring Without Repeating Characters" on Leet Code


class Solution {
public:
    int lengthOfLongestSubstring(string s) {
        string candidate_str = "";
        string checking_str = "";
        size_t position = std::string::npos;
        for (auto& ch : s)
        {
            position = checking_str.find(ch);
            if (position …
Evgenij LegotskojJune 13, 2022, 4:13 a.m.

C++Leed Code Solutions - 002 - Add Two Numbers

LeetCode, cpp, C++

Solution "Add Two Numbers" on Leet Code


/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode …
Evgenij LegotskojJune 13, 2022, 3:58 a.m.

C++Leet Code Solutions - 001 - Two Sum

cpp, LeetCode, C++

Two Sum solution on Leet Code


The simple solution

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        for (int i = 0; i < nums.size(); ++i)
        {
            for (int j = i + 1; j < nums.size(); ++j) …
Evgenij LegotskojJune 1, 2022, 4:30 a.m.

DjangoDjango - Lesson 059. Saving the selected language in user settings

python, language, django, translation

In this article, I would like to show an example of how you can make a link on the site so that the user can switch between languages on the site.

But I will show a more advanced version of …

Pavel DorofeevMay 29, 2022, 11:28 a.m.

Projects based on QtКак реализовать TLSv1.2 на Qt 4.8.1

qssl

Initially, QSsl in Qt 4.8.1 (released about 13 years ago) used only the maximum of TLS v1.0.

Today is 2022 and Tls v1.0 and v1.1 are being blocked by almost every decent site on the internet.

Qt in QSsl uses …

Evgenij LegotskojApril 18, 2022, 5:39 p.m.

DjangoDjango - Tutorial 058. Database Growth Due to django_session Table

Django, Postgres, garbage collection, Python, PostgreSQL

Lately, I have noticed that the fatal moment is approaching, when the disk space for the site on the hosting will catastrophically cease to be enough. And the database dump becomes incredibly huge, although there are no obvious prerequisites for …

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C ++ - Test 004. Pointers, Arrays and Loops

  • Result:50points,
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C ++ - Test 004. Pointers, Arrays and Loops

  • Result:50points,
  • Rating points-4
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C ++ - Test 004. Pointers, Arrays and Loops

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Хочу поделится, мы сделали свой вариант QSqlRelationalTableModel и заодно к нему новое развитие QTableView, и получилась готовая таблица PblTableDlg, у которой реализованы внешние связи, комбобо…
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Hello Evgenij, regarding the online installer, I've tried many times to use web host for the created repo after repogen step. I tried using github but I found people talking it is not …
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Qt/C++ - Lesson 051. QMediaPlayer – simple audio player

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В этом случае вижу только какой-нибудь костыль в стиле перебора по всем индексам в заголовке с помощью методу headerData . То есть пройтись в for цикле пока не будет совпадения н…
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Qt/C++ - Lesson 039. How to paint stroke in QSqlTableModel by value in the column?

Спасибо за ответ. Нет, дело не в читаемости кода, в разных таблицах у меня есть столбцы с одинаковым именем, но с разными индексами. Хотел сделать решение по имени столбца для всех таблиц сразу.…
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django rest framework лишние символы

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