Roor Proxy

To specify the data of a proxy server in the Opera browser, you need to follow the algorithm below:

Open the browser.
Click on the Opera icon in the upper left corner.
Go to "Settings".
Select the "Advanced" option.
Scroll down to the "System" tab.
Click "Open proxy settings for computer".
Click on "Network settings".
Activate the "Use a proxy server" option.
In the tab that opens, specify the IP address of the proxy server. The address must be entered in the field of the protocol to which the proxy server belongs. You can get this information from your proxy provider. Click "OK" to save your settings.

Qt primarily focuses on providing tools and libraries for GUI development, networking, and other application-level features. While it includes facilities for working with XML through classes like QXmlStreamReader and QXmlStreamWriter, these are more geared toward parsing XML rather than HTML.

For HTML parsing, especially when using XPath expressions, you might need to consider additional libraries or tools. One common choice is to use a third-party library like Gumbo or htmlcxx. These libraries are not part of the Qt framework, but they can be used alongside Qt to handle HTML parsing.

Here's a basic example using htmlcxx for HTML parsing:

#include 
#include 
#include 

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);

    std::string htmlData = "
Hello, world!
";

    htmlcxx::HTML::ParserDom parser;
    tree dom = parser.parseTree(htmlData);

    // Example XPath query
    std::string xpathExpression = "//p/span";
    std::vector::iterator> result;
    htmlcxx::XPath::NodeSet nodeSet;
    htmlcxx::XPath::Parser xpathParser;
    xpathParser.compile(xpathExpression.c_str(), &nodeSet);

    for (tree::iterator it = dom.begin(); it != dom.end(); ++it) {
        nodeSet.evaluate(*it);
        if (nodeSet.size() > 0) {
            result.push_back(it);
        }
    }

    // Output the result
    for (auto &it : result) {
        std::cout << "Match found: " << htmlcxx::HTML::toPlainText(it->begin(), it->end()) << std::endl;
    }

    return a.exec();
}

In this example, I've used htmlcxx for HTML parsing and XPath queries. Note that you need to include the htmlcxx library in your project.

To log into an account using Selenium, you need to locate the login form elements, enter the login credentials, and submit the form. The exact steps may vary depending on the website's structure, but here's a general example using C#:

Install the required NuGet packages:

Install-Package OpenQA.Selenium.Chrome.WebDriver -Version 3.141.0
Install-Package OpenQA.Selenium.Support.UI -Version 3.141.0

Create a method to log into an account:

using OpenQA.Selenium;
using OpenQA.Selenium.Support.UI;
using System;

public static void LoginToAccount(IWebDriver driver, string username, string password)
{
    // Locate the username field
    IWebElement usernameField = driver.FindElement(By.Id("username"));
    usernameField.SendKeys(username);

    // Locate the password field
    IWebElement passwordField = driver.FindElement(By.Id("password"));
    passwordField.SendKeys(password);

    // Locate the login button and click it
    IWebElement loginButton = driver.FindElement(By.Id("login-button"));
    loginButton.Click();

    // Wait for the login process to complete (optional)
    WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
    wait.Until(d => d.FindElement(By.Id("logout-link")));
}

Use the LoginToAccount method in your test code:

using OpenQA.Selenium;
using System;

namespace SeleniumLoginExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Set up the WebDriver
            IWebDriver driver = new ChromeDriver();
            driver.Manage().Window.Maximize();

            // Navigate to the login page
            driver.Navigate().GoToUrl("https://www.example.com/login");

            // Wait for the login form to load
            WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
            IWebElement loginForm = wait.Until(x => x.Id == "login-form");

            // Log in to the account
            LoginToAccount(driver, "your_username", "your_password");

            // Perform any additional actions as needed

            // Close the browser
            driver.Quit();
        }
    }
}

In this example, we first create a method called LoginToAccount that takes an IWebDriver instance, a username, and a password as input. Inside the method, we locate the username field, password field, and login button using their respective IDs, and then enter the credentials and click the login button.

In the test code, we set up the WebDriver, navigate to the login page, and wait for the login form to load. Then, we call the LoginToAccount method with the required credentials. After logging in, you can perform any additional actions as needed.

Remember to replace "https://www.example.com/login", "your_username", and "your_password" with the actual login page URL and your credentials.

In Scrapy, you can control the caching behavior of requests made by rules in your spider by adjusting the dont_cache attribute in the Rule object. The dont_cache attribute, when set to True, indicates that the requests matched by the rule should not be cached.

Here's an example of how you can use dont_cache in a CrawlSpider:

from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule

class MySpider(CrawlSpider):
    name = 'my_spider'
    allowed_domains = ['example.com']
    start_urls = ['http://example.com']

    rules = (
        # Example Rule with dont_cache set to True
        Rule(LinkExtractor(allow=('/page/')), callback='parse_page', follow=True, dont_cache=True),
    )

    def parse_page(self, response):
        # Your parsing logic for individual pages goes here
        pass

- The spider is defined as a CrawlSpider.
- The Rule is created with LinkExtractor to match URLs that contain '/page/' in them.
- The dont_cache=True attribute is set to True in the Rule, indicating that requests matched by this rule should not be cached.

By setting dont_cache to True, Scrapy will make sure that requests matched by this rule will be fetched without considering the cache. This is useful when you want to ensure that each request to the specified URLs results in a fresh response, bypassing any cached data.

After editing is complete, the proxy must be disabled in order to send the video for color correction. To do this, select all the proxies in the project window and choose the "Switch offline" command from the context menu. Then, after making sure that the "Media files remain on disk" option is active, click "Ok". If after that the program monitor window is filled with red color, do not be frightened, it is normal.