Whiteboy Posts - Answer Overflow

Topics

Whiteboy

•Created by Whiteboy on 12/11/2024 in #help

✅ Testing an abstract class

NOTE: Because SomeClass is an abstract class, you'll need to create a subclass in order to use most of this functionality. This ensures that the specific details associated with a given bank account type can be handled appropriately. i don't understand that, i have some tests to pass ( I can't modify them ) and they take SomeClass and try to make instance of it and test methods inside, how do i pass those tests?

7 replies

•Created by Whiteboy on 4/24/2024 in #help

✅ Executing bash script in docker container with Docket.DotNet in ASP.NET website

No description

121 replies

•Created by Whiteboy on 3/19/2024 in #help

Read process RAM usage in real time from docker container using c#

So i have web app in asp.net that user Docker.dotnet to run some things in docker containers and i need to read memory of some process inside the container. How can i do it? it has to be in real time tho

2 replies

•Created by Whiteboy on 2/8/2024 in #help

✅ Submit form just once, disabling the button breaks form submition

So i need to submit form just once and the submitions takes about 3-5s, how can i prevent user from spamming the button (it creates huge load on server if he spams 100cps) if i wrote simple JS to disable the button after clicking it doesn't submit the form

    <form method="post" asp-page-handler="SubmitCode" asp-route-assignmentId="@Model.Assignment.AssignmentId">
        <div align="center">
            <textarea id="UserCode" name="UserCode" class="form-control" style="resize: vertical; width: 98%;" rows="20" placeholder="Enter your code here"></textarea>
        </div>
        <div style="margin-right: 1%; margin-bottom: 1%; margin-top: 1%" align="right">
            <button id="SubmitCode" type="submit" name="action" value="SubmitCode" class="btn btn-primary" disabled>Submit</button>
        </div>
    </form>

    <form method="post" asp-page-handler="SubmitCode" asp-route-assignmentId="@Model.Assignment.AssignmentId">
        <div align="center">
            <textarea id="UserCode" name="UserCode" class="form-control" style="resize: vertical; width: 98%;" rows="20" placeholder="Enter your code here"></textarea>
        </div>
        <div style="margin-right: 1%; margin-bottom: 1%; margin-top: 1%" align="right">
            <button id="SubmitCode" type="submit" name="action" value="SubmitCode" class="btn btn-primary" disabled>Submit</button>
        </div>
    </form>

5 replies

•Created by Whiteboy on 1/30/2024 in #help

✅ MySQL with Entity Framework, getting null of entity all time

public class UserAssignmentDate
{
    [ForeignKey("UserId")]
    public int UserId { get; set; }

    [ForeignKey("AssignmentId")]
    public int AssignmentId { get; set; }
    
    public DateTimeOffset AssignmentTime { get; set; }
    public DateTimeOffset DeadLineDateTime { get; set; }
    public DateTimeOffset LastUploadDateTime { get; set; }
    public TimeSpan TimeToNextUpload { get; set; }

    // Navigation properties
    public User User { get; set; }
    public Assignment Assignment { get; set; }
}

public class UserAssignmentDate
{
    [ForeignKey("UserId")]
    public int UserId { get; set; }

    [ForeignKey("AssignmentId")]
    public int AssignmentId { get; set; }
    
    public DateTimeOffset AssignmentTime { get; set; }
    public DateTimeOffset DeadLineDateTime { get; set; }
    public DateTimeOffset LastUploadDateTime { get; set; }
    public TimeSpan TimeToNextUpload { get; set; }

    // Navigation properties
    public User User { get; set; }
    public Assignment Assignment { get; set; }
}

            var userAssignmentDate = await dbContext.UserAssignmentDates
                .FirstOrDefaultAsync(userAssignmentDate => userAssignmentDate.UserId == UserId && userAssignmentDate.AssignmentId == assignmentId);

            var userAssignmentDate = await dbContext.UserAssignmentDates
                .FirstOrDefaultAsync(userAssignmentDate => userAssignmentDate.UserId == UserId && userAssignmentDate.AssignmentId == assignmentId);

        foreach (int userId in userIds)
        {
            var userAssignmentDate = new UserAssignmentDate
            {
                UserId = userId,
                AssignmentId = assignmentId,
                AssignmentTime = assignmentTime,
                LastUploadDateTime = DateTimeOffset.MinValue,
            };

            dbContext.UserAssignmentDates.Add(userAssignmentDate);
        }
        
        await dbContext.SaveChangesAsync();

        foreach (int userId in userIds)
        {
            var userAssignmentDate = new UserAssignmentDate
            {
                UserId = userId,
                AssignmentId = assignmentId,
                AssignmentTime = assignmentTime,
                LastUploadDateTime = DateTimeOffset.MinValue,
            };

            dbContext.UserAssignmentDates.Add(userAssignmentDate);
        }
        
        await dbContext.SaveChangesAsync();

and userAssignmentDate returns null all time when UserId and AssignmentId are good values

26 replies

•Created by Whiteboy on 1/24/2024 in #help

✅ EF with MySQL getting double/triple time values ?!

So i assign task to user and set the assignTime to DateTime.Now so i should be able to get remaining time right?

var userTaskAssignment = dbContext.UserTaskAssignments.FirstOrDefault(assignment => assignment.TaskId == taskId && assignment.UserId == UserId);
                if (userTaskAssignment != null)
                {
                    RemainingTime = userTaskAssignment.TimeToCompleteTask - DateTime.Now;
                    RemainingHours = RemainingTime.TotalHours;
                    RemainingMinutes = RemainingTime.TotalMinutes;
                    RemainingSeconds = RemainingTime.TotalSeconds;
                }

var userTaskAssignment = dbContext.UserTaskAssignments.FirstOrDefault(assignment => assignment.TaskId == taskId && assignment.UserId == UserId);
                if (userTaskAssignment != null)
                {
                    RemainingTime = userTaskAssignment.TimeToCompleteTask - DateTime.Now;
                    RemainingHours = RemainingTime.TotalHours;
                    RemainingMinutes = RemainingTime.TotalMinutes;
                    RemainingSeconds = RemainingTime.TotalSeconds;
                }

    private async Task<Task?> AssignTaskToUserIds(List<int> userIds, int taskId, TimeSpan taskLifespan)
    {
        DateTime assignmentTime = DateTime.Now;

        foreach (int userId in userIds)
        {
            UserTaskAssignment userTaskAssignment = new UserTaskAssignment
            {
                UserId = userId,
                TaskId = taskId,
                AssignmentTime = assignmentTime,
            };

            dbContext.UserTaskAssignments.Add(userTaskAssignment);
        }
        
        await dbContext.SaveChangesAsync();
        
        var assignedTasks = dbContext.UserTaskAssignments
            .Where(uta => userIds.Contains(uta.UserId) && uta.TaskId == taskId)
            .ToList();
        
        foreach (var assignment in assignedTasks)
        {
            assignment.TimeToCompleteTask = assignment.AssignmentTime.Add(taskLifespan);
        }
        
        await dbContext.SaveChangesAsync();

        PageHelper.SetTempDataSuccessMessage("Task assigned successfully", TempData);
        return null;
    }

    private async Task<Task?> AssignTaskToUserIds(List<int> userIds, int taskId, TimeSpan taskLifespan)
    {
        DateTime assignmentTime = DateTime.Now;

        foreach (int userId in userIds)
        {
            UserTaskAssignment userTaskAssignment = new UserTaskAssignment
            {
                UserId = userId,
                TaskId = taskId,
                AssignmentTime = assignmentTime,
            };

            dbContext.UserTaskAssignments.Add(userTaskAssignment);
        }
        
        await dbContext.SaveChangesAsync();
        
        var assignedTasks = dbContext.UserTaskAssignments
            .Where(uta => userIds.Contains(uta.UserId) && uta.TaskId == taskId)
            .ToList();
        
        foreach (var assignment in assignedTasks)
        {
            assignment.TimeToCompleteTask = assignment.AssignmentTime.Add(taskLifespan);
        }
        
        await dbContext.SaveChangesAsync();

        PageHelper.SetTempDataSuccessMessage("Task assigned successfully", TempData);
        return null;
    }

For some reason when i set TimeToCompleteTask = 1h and i go to user i get 3h to complete task orr 1h 59min?

47 replies

•Created by Whiteboy on 1/24/2024 in #help

✅ ASP.NET Fetch request to MySQL

So i want to chcek if typed login exisits in db but i get all time error 404

Error checking login existence: Error: HTTP error! Status: 404
    at 3:176:31
(anonymous)    @    3:191
Promise.catch (async)        
checkLoginExists    @    3:190
checkLogins    @    3:202
(anonymous)    @    3:208

Error checking login existence: Error: HTTP error! Status: 404
    at 3:176:31
(anonymous)    @    3:191
Promise.catch (async)        
checkLoginExists    @    3:190
checkLogins    @    3:202
(anonymous)    @    3:208

        function checkLoginExists(login) {
            fetch(`/AssignTask/{taskId}?handler=CheckLoginExists&login=${login}`, { method: 'GET' })
                .then(response => {
                    if (!response.ok) {
                        throw new Error(`HTTP error! Status: ${response.status}`);
                    }
                    return response.json();
                })
                .then(data => {
                    const loginErrorMessage = document.getElementById('loginErrorMessage');
        
                    if (!data.exists) {
                        loginErrorMessage.textContent = `User with login '${login}' not found in the database.`;
                    } else {
                        loginErrorMessage.textContent = '';  // Clear the error message
                        enableAssignButton();
                    }
                })
                .catch(error => {
                    console.error('Error checking login existence:', error);
                    // Handle the error, e.g., display a generic error message
                });
        }

        function checkLogins(logins) {
            let loginLines = logins.split("\n");
    
            for (let i = 0; i < loginLines.length; i++) {
                let login = loginLines[i].trim();
                if (login !== "") {
                    checkLoginExists(login);
                }
            }
        }

        function checkLoginExists(login) {
            fetch(`/AssignTask/{taskId}?handler=CheckLoginExists&login=${login}`, { method: 'GET' })
                .then(response => {
                    if (!response.ok) {
                        throw new Error(`HTTP error! Status: ${response.status}`);
                    }
                    return response.json();
                })
                .then(data => {
                    const loginErrorMessage = document.getElementById('loginErrorMessage');
        
                    if (!data.exists) {
                        loginErrorMessage.textContent = `User with login '${login}' not found in the database.`;
                    } else {
                        loginErrorMessage.textContent = '';  // Clear the error message
                        enableAssignButton();
                    }
                })
                .catch(error => {
                    console.error('Error checking login existence:', error);
                    // Handle the error, e.g., display a generic error message
                });
        }

        function checkLogins(logins) {
            let loginLines = logins.split("\n");
    
            for (let i = 0; i < loginLines.length; i++) {
                let login = loginLines[i].trim();
                if (login !== "") {
                    checkLoginExists(login);
                }
            }
        }

16 replies

•Created by Whiteboy on 12/30/2023 in #help

ASP.NET file data not being saved in page

So i need to upload user list from .xslx file and displa yit in a table for adjustments, then send send the users to mySQL db, the problem i have is that after i upload file and try to send ti db the "ExtractedData" returns null

27 replies

•Created by Whiteboy on 12/4/2023 in #help

ASP.NET HTTP ERROR 401 after deleting cookies

So i need to login users using authorization prompt and just get their logins, but when i tried to make a logout and cleared cookie data on site to try logging in with other account it stopped working (I get http error 401) Edit: I tested with other browser and the login works just file but i remain logged in even after not saving credentials and reopening the page. How do i fix it?

    public class IndexModel : PageModel
    {
        public string Username { get; private set; }

        public IActionResult OnGet()
        {
            string authHeader = Request.Headers["Authorization"];

            if (!string.IsNullOrEmpty(authHeader) && authHeader.StartsWith("Basic "))
            {
                string base64Credentials = authHeader.Substring("Basic ".Length).Trim();
                string credentials = Encoding.UTF8.GetString(Convert.FromBase64String(base64Credentials));

                string[] parts = credentials.Split(':');
                Username = parts[0];

                return Page();
            }

            // If no valid authentication header, return a challenge response to prompt for credentials
            Response.Headers["WWW-Authenticate"] = "Basic realm=\"My Realm\"";
            return new UnauthorizedResult();
        }
    }

    public class IndexModel : PageModel
    {
        public string Username { get; private set; }

        public IActionResult OnGet()
        {
            string authHeader = Request.Headers["Authorization"];

            if (!string.IsNullOrEmpty(authHeader) && authHeader.StartsWith("Basic "))
            {
                string base64Credentials = authHeader.Substring("Basic ".Length).Trim();
                string credentials = Encoding.UTF8.GetString(Convert.FromBase64String(base64Credentials));

                string[] parts = credentials.Split(':');
                Username = parts[0];

                return Page();
            }

            // If no valid authentication header, return a challenge response to prompt for credentials
            Response.Headers["WWW-Authenticate"] = "Basic realm=\"My Realm\"";
            return new UnauthorizedResult();
        }
    }

8 replies

•Created by Whiteboy on 11/28/2023 in #help

Testing Coding Plagiarisms C# CPP Java

So im making a website in ASP.NET that creates tests for coding questions and need to test plagiarized inputs, i've made a good one for c# but i still need one for Java and CPP and couldn't manage to do so for a while. Can you reccomend any lib or something i can use for other languages? Mostly to tokenize the code. I've also tried using ANTLR4 but i couldn't figure it much. My work so far: https://github.com/Whiteboy92/TestPlagiarismCA

19 replies

•Created by Whiteboy on 11/3/2023 in #help

❔ ✅ Coding Test Website in ASP.NET

No description

97 replies

•Created by Whiteboy on 7/2/2023 in #help

Timer not working

So i want a simple timer for my WPF app so i can run a Update each second but it sends an update every 2-3s instead how do i fix it?

        private void StartUpdateLoop()
        {
            updateTimer = new Timer(Update, null, TimeSpan.Zero,                  TimeSpan.FromSeconds(1));
        }

        private void StartUpdateLoop()
        {
            updateTimer = new Timer(Update, null, TimeSpan.Zero,                  TimeSpan.FromSeconds(1));
        }

        public MainWindow()
        {
            InitializeComponent();
            StartUpdateLoop();
        }

        public MainWindow()
        {
            InitializeComponent();
            StartUpdateLoop();
        }

        private void Update(object? state)
        {
            elapsedTime++;
            if (elapsedTime % 3 == 0)
            {
                IncreaseCurrentMoney(power1Output);
            }
            if (elapsedTime % 9 == 0)
            {
                IncreaseCurrentMoney(power2Output);
            }
            if (elapsedTime % 27 == 0)
            {
                IncreaseCurrentMoney(power3Output);
            }
            if (elapsedTime % 81 == 0)
            {
                IncreaseCurrentMoney(power4Output);
            }
            if (elapsedTime % 273 == 0)
            {
                IncreaseCurrentMoney(power5Output);
            }
        }

        private void IncreaseCurrentMoney(double amount)
        {
            lock (this)
            {
                currentMoney += amount;
                LbCurrentMoney.Content = $"{currentMoney}$";
            }
        }

        private void Update(object? state)
        {
            elapsedTime++;
            if (elapsedTime % 3 == 0)
            {
                IncreaseCurrentMoney(power1Output);
            }
            if (elapsedTime % 9 == 0)
            {
                IncreaseCurrentMoney(power2Output);
            }
            if (elapsedTime % 27 == 0)
            {
                IncreaseCurrentMoney(power3Output);
            }
            if (elapsedTime % 81 == 0)
            {
                IncreaseCurrentMoney(power4Output);
            }
            if (elapsedTime % 273 == 0)
            {
                IncreaseCurrentMoney(power5Output);
            }
        }

        private void IncreaseCurrentMoney(double amount)
        {
            lock (this)
            {
                currentMoney += amount;
                LbCurrentMoney.Content = $"{currentMoney}$";
            }
        }

25 replies

•Created by Whiteboy on 6/15/2023 in #help

❔ Fast Fourier Transform. I need to make app displaying image and result like ImageJ

10 replies

•Created by Whiteboy on 4/18/2023 in #help

❔ Check pixel intensity along a line in image

so i made this funcion that should do it but i get this weird error

        private void DrawProfileLane()
        {
            // load image and convert to grayscale
            Image<Bgr, byte> image = new Image<Bgr, byte>("path/to/image.jpg");
            Image<Gray, byte> grayImage = image.Convert<Gray, byte>();

            // check that both points are defined
            if (_firstPoint == null || _secondPoint == null)
            {
                return;
            }

            // define line between two points
            Point firstPoint = _firstPoint.Value;
            Point secondPoint = _secondPoint.Value;
            LineSegment2D line = new LineSegment2D(firstPoint, secondPoint);
            float dx = line.Direction.X;
            float dy = line.Direction.Y;
            double length = line.Length;

            // get pixel intensity values along the line using a parallel for loop
            int[] intensities = new int[(int)length];
            Parallel.For(0, (int)length, i =>
            {
                Point pointOnLine = new Point((int)(firstPoint.X + i * dx / length), (int)(firstPoint.Y + i * dy / length));
                intensities[i] = grayImage.Data[(int) pointOnLine.Y, (int) pointOnLine.X, 0];
            });

            // create plot and add data
            double[] intensitiesDouble = intensities.Select(x => (double)x).ToArray();
            WpfPlot plot = new WpfPlot();
            plot.Plot.AddSignal(intensitiesDouble);

            // create and show window
            ProfileLaneWindow profileLaneWindow = new ProfileLaneWindow
            {
                Title = $"Profile Lane Plot of {Title}",
                ProfileLanePlot = plot,
            };
            profileLaneWindow.Show();
        }

        private void DrawProfileLane()
        {
            // load image and convert to grayscale
            Image<Bgr, byte> image = new Image<Bgr, byte>("path/to/image.jpg");
            Image<Gray, byte> grayImage = image.Convert<Gray, byte>();

            // check that both points are defined
            if (_firstPoint == null || _secondPoint == null)
            {
                return;
            }

            // define line between two points
            Point firstPoint = _firstPoint.Value;
            Point secondPoint = _secondPoint.Value;
            LineSegment2D line = new LineSegment2D(firstPoint, secondPoint);
            float dx = line.Direction.X;
            float dy = line.Direction.Y;
            double length = line.Length;

            // get pixel intensity values along the line using a parallel for loop
            int[] intensities = new int[(int)length];
            Parallel.For(0, (int)length, i =>
            {
                Point pointOnLine = new Point((int)(firstPoint.X + i * dx / length), (int)(firstPoint.Y + i * dy / length));
                intensities[i] = grayImage.Data[(int) pointOnLine.Y, (int) pointOnLine.X, 0];
            });

            // create plot and add data
            double[] intensitiesDouble = intensities.Select(x => (double)x).ToArray();
            WpfPlot plot = new WpfPlot();
            plot.Plot.AddSignal(intensitiesDouble);

            // create and show window
            ProfileLaneWindow profileLaneWindow = new ProfileLaneWindow
            {
                Title = $"Profile Lane Plot of {Title}",
                ProfileLanePlot = plot,
            };
            profileLaneWindow.Show();
        }

Argument type 'System.Windows.Point' is not assignable to parameter type 'System.Drawing.Point' here:

LineSegment2D line = new LineSegment2D(firstPoint, secondPoint);

LineSegment2D line = new LineSegment2D(firstPoint, secondPoint);

at "firstPoint"

3 replies

•Created by Whiteboy on 3/23/2023 in #help

✅ Process image using Emgu.CV, WPF app .NET 7.0

So i have to check if the image i upload is in Grayscale or not and based on it make further progress here is how i upload image:

        private void BtnOpenNewFile_Click(object sender, RoutedEventArgs e)
        {
            var openFileDialog = new OpenFileDialog
            {
                Filter = "Image Files (*.bmp;*.jpg;*.jpeg;*.gif;*.png)|*.bmp;*.jpg;*.jpeg;*.gif;*.png"
            };
            
            if (openFileDialog.ShowDialog() == true)
            {
                Mat image = new Mat(openFileDialog.FileName, ImreadModes.Color);
                string fileName = Path.GetFileNameWithoutExtension(openFileDialog.FileName);

                ImageWindow imageWindow = new ImageWindow();

                if (image.Height > 1000 || image.Width > 1000)
                {
                    imageWindow.Height = 1000;
                    imageWindow.Width = 1000;
                }
                else
                {
                    imageWindow.Height = image.Height + 200;
                    imageWindow.Width = image.Width + 50;
                }

                imageWindow.Title = fileName;
                imageWindow.ImgMainImage.Source = image.ToBitmapSource();
                imageWindow.Show();
            }
        }

        private void BtnOpenNewFile_Click(object sender, RoutedEventArgs e)
        {
            var openFileDialog = new OpenFileDialog
            {
                Filter = "Image Files (*.bmp;*.jpg;*.jpeg;*.gif;*.png)|*.bmp;*.jpg;*.jpeg;*.gif;*.png"
            };
            
            if (openFileDialog.ShowDialog() == true)
            {
                Mat image = new Mat(openFileDialog.FileName, ImreadModes.Color);
                string fileName = Path.GetFileNameWithoutExtension(openFileDialog.FileName);

                ImageWindow imageWindow = new ImageWindow();

                if (image.Height > 1000 || image.Width > 1000)
                {
                    imageWindow.Height = 1000;
                    imageWindow.Width = 1000;
                }
                else
                {
                    imageWindow.Height = image.Height + 200;
                    imageWindow.Width = image.Width + 50;
                }

                imageWindow.Title = fileName;
                imageWindow.ImgMainImage.Source = image.ToBitmapSource();
                imageWindow.Show();
            }
        }

and here is how i try to convert it but no matter if i upload gray image or not it says the image is already in grayscale, (i checked using ImageJ)

20 replies

•Created by Whiteboy on 10/28/2022 in #help

Counting Sort, display the array

I need to display the array which counted how many each numbers there are like in the screen

7 replies

•Created by Whiteboy on 10/15/2022 in #help

Hi, I have simple golf game in Unity and the ball keeps hitting invisible objects [Answered]

well not every time, but i don't know where they come from. When i paused the game and checked scene there was nothing sus

11 replies

•Created by Whiteboy on 10/12/2022 in #help

Unity 2 golf, ball doesn't stop rolling and... [Answered]

6 replies

•Created by Whiteboy on 9/3/2022 in #help

Enable button from another Form [Answered]

there is -Main menu then 3 subforms to main menu -A, B, C I want to enable Main Menu button when i click a button in form A or B or C and the code that moves user through forms

        private void OpenChildForm(Form childForm, object btnSender)
        {
            if (btnSender is null)
            {
                throw new ArgumentNullException(nameof(btnSender));
            }

            _activeForm?.Close();

            _activeForm = childForm;
            childForm.TopLevel = false;
            childForm.FormBorderStyle = FormBorderStyle.None;
            childForm.Dock = DockStyle.Fill;
            this.panelDesktop.Controls.Add(childForm);
            this.panelDesktop.Tag = childForm;
            childForm.BringToFront();
            childForm.Show();
        }

        private void OpenChildForm(Form childForm, object btnSender)
        {
            if (btnSender is null)
            {
                throw new ArgumentNullException(nameof(btnSender));
            }

            _activeForm?.Close();

            _activeForm = childForm;
            childForm.TopLevel = false;
            childForm.FormBorderStyle = FormBorderStyle.None;
            childForm.Dock = DockStyle.Fill;
            this.panelDesktop.Controls.Add(childForm);
            this.panelDesktop.Tag = childForm;
            childForm.BringToFront();
            childForm.Show();
        }

195 replies

•Created by Whiteboy on 9/2/2022 in #help

Why all my randoms are the same? [Answered]

so there is the code and the outputs why are they the same and how to change it?

46 replies