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Asynchronous array problems


Asynchronous array problems

By : Jaco van der Kleij
Date : November 25 2020, 09:00 AM
I wish this help you The issue is that at the moment the task function (function(cb) { ... }) is called, search already has a different value, the value of the last iteration. All the tasks refer to the same search variable and therefore perform the same search.
This is the typical "closure inside loop" problem.
code :


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How to solve these problems with Asynchronous Callback?

How to solve these problems with Asynchronous Callback?


By : mchollan
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I can't think of a clean solution to your problem. You'd have to write fugly code like this:
code :
  AsyncResult result = (AsyncResult)iresult;
  if (result.AsyncDelegate is AsyncDelegate1) {
    (result.AsyncDelegate as AsyncDelegate1).EndInvoke(iresult);
  }
  else if (result.AsyncDelegate is AsyncDelegate2) {
    (result.AsyncDelegate as AsyncDelegate2).EndInvoke(iresult);
  }
  //etc...
  ComputationResult answer = result.AsyncState as ComputationResult;
  var task1 = new AsyncDelegate1(Compute1);
  var result1 = new ComputationResult("task1");
  task1.BeginInvoke(42, result1, 
    new AsyncCallback((ia) => {
      AsyncResult result = ia as AsyncResult;
      (result.AsyncDelegate as AsyncDelegate1).EndInvoke(ia);
      CommonCallback(result.AsyncState as ComputationResult);
    }), 
    result1);
Problems with asynchronous methods

Problems with asynchronous methods


By : Noobart
Date : March 29 2020, 07:55 AM
will be helpful for those in need Wouldn't it mean that you probably need to load the country and wait for change event on the country combobox to update state and so on? If you do that, you dont have to worry about asynchronicity of your requests? Otherwise, you might be able to use DataProviders and they might provide Event:Complete.. I am not sure though, I definitely am not an expert.. :)
Asynchronous loading problems

Asynchronous loading problems


By : Amol Chaudhari
Date : March 29 2020, 07:55 AM
should help you out The primary reason is because you image load is asynchronous so for your code to work your images must be loaded before you try to paint it. You can preload the images in JS and then on success of all the image loads fire the drawImageAt method.
Asynchronous problems in C#

Asynchronous problems in C#


By : IcebergWebDev
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further This is the issue: answer = MyQuestion(question).Result;.
Using Result on a Task means "get me the result, but if it's not yet available, wait - ie block the thread waiting for the result of this".
code :
class QuestionAndAnswer {
    public string Question { get; set; } 
    public string Answer { get; set; }
}

private List<QuestionAndAnswer> _currentQuestions; // create this list when loading everything

private int _currentQuestionIndex = 0; // points to which element/index in the list contains the question shown on screen

// call this once after you have loaded _currentQuestions with your data
public void ShowCurrentQuestion() { 
    var currQuestion = _currentQuestion[_currentQuestionIndex];
    computerQuestionLabel.Text = currQuestion.Question;
    answerTextBox.Text = "";
}

// call this from whichever event handler means that the user has
// submitted an answer - an Answer button's Click event, maybe
// answerTextBox's KeyPress event or something else.
public void CheckForAnswer() {
    var currentAnswer = answerTextBox.Text;
    var currQuestion = _currentQuestion[_currentQuestionIndex];
    if (currQuestion.Answer == currentAnswer) { // correct
        var nextQuestionIndex = _currentQuestionIndex + 1;
        if (nextQuestionIndex == _currentQuestion.Count) { 
            // all questions answered! do the appropriate thing
        } else {
            // still questions left, show the next one
            _currentQuestionIndex = nextQuestionIndex;
            ShowCurrentQuestion();
        }
    } else {
        // wrong answer; the question that needs to be shown is 
        // already shown, you can handle "stop" or other things here
    }
}
CLLocationManager is asynchronous. Having problems with this

CLLocationManager is asynchronous. Having problems with this


By : user2553592
Date : March 29 2020, 07:55 AM
will be helpful for those in need From the documentation for didUpdateLocations:
code :
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let location = locations.last {
        currentLocation = location
    }
}
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