Skip to main content

Periodically run a method without freezing UI.

 This was one of the requirements to periodically check if the internet connection for a system is on / off. Based on the Internet Connectivity Status, it will do certain actions. How do I check the Internet Connection Status periodically and asynchronously? 

To solve this programming puzzle (in C#.NET), I have used System.Timers.Timer class. There was one more class available in the .NET framework, that was, System.Threading.Timer. I have chosen System.Timers.Timer class, because it is thread-safe but System.Threading.Timer class isn't out of the box.

Step 1: Created an elapsed event handler for the timer class:

<Code>

// Create a timer with 10 seconds interval in the init method of the form application;
m_Timer = new System.Timers.Timer(10 * 1000);
/* It's going to fire the below-highlighted method every 10 seconds*/
m_Timer.Elapsed += checkInternetConnectionState
m_Timer.Enabled = true;

</Code>

Step 2: Created checkInternetConnectionState async method definition:

<Code>

private async void checkInternetConnectionState(Object? source, ElapsedEventArgs e)
{
    // The aqua-highlighted one actually going to do the task
    List<string>? connectDetails = await GetConnectionDetailsAsync()
}

</Code>

Step 3: Defined GetConnectionDetailsAsync  as below:

<Code>

private Task<List<string>?> GetConnectionDetailsAsync()
        {
            List<string>? connectionDetails = null;
            return Task.Run(() => {
                if ((Microsoft.WindowsAPICodePack.Net.
                        NetworkListManager.IsConnectedToInternet))
                {
                    NetworkCollection netCollection = 
                        NetworkListManager.
                        GetNetworks(NetworkConnectivityLevels.Connected);
                    connectionDetails = new List<string>();
                    foreach (Network net in netCollection)
                    {
                        if (net.IsConnected)
                        {
                            connectionDetails.Add(net.Name);
                            connectionDetails.Add(net.Category.ToString());
                            connectionDetails.Add(net.DomainType.ToString());
                            connectionDetails.Add(net.ConnectedTime.ToString());
                        }
                    }
                }
                return connectionDetails;
            });
        }

</Code>

I have used WindowsAPICodePack to get internet connectivity status and details. If we stitch these three steps together we can achieve the desired goal. 

Comments

Popular posts from this blog

Variadic template class to add numbers recursively during compilation

 The idea of having a class to add numbers (variable parameters) during compilation time recursively. Also wanted to restrict types to a single type while sending parameters to class member function. That said, if we mix int, float and double types to add function shall result in compilation error. How do we achieve this. The below is the code which actually helps to achieve this: <code> #include < fmt/format.h > template < typename T> class MyVarSumClass{     private :         T _sum = 0 ;     public :         template < typename ... TRest>         T add(T num, TRest... nums){             static_assert (std::conjunction<std::is_same<TRest, T>...>{}); /* Assert fails                if types are different */             _sum += num;             return add(nums...); // Next parameter packs gets picked recursively         }         // Base case         T add(T num){             _sum += num;             return _sum;         } }; int main() {     My

A simple approach to generate Fibonacci series via multi-threading

T his is a very simple approach taken to generate the Fibonacci series through multithreading. Here instead of a function, used a function object. The code is very simple and self-explanatory.  #include <iostream> #include <mutex> #include <thread> class Fib { public:     Fib() : _num0(1), _num1(1) {}     unsigned long operator()(); private:     unsigned long _num0, _num1;     std::mutex mu; }; unsigned long Fib::operator()() {     mu.lock(); // critical section, exclusive access to the below code by locking the mutex     unsigned long  temp = _num0;     _num0 = _num1;     _num1 = temp + _num0;     mu.unlock();     return temp; } int main() {     Fib f;          int i = 0;     unsigned long res = 0, res2= 0, res3 = 0;     std::cout << "Fibonacci series: ";     while (i <= 15) {         std::thread t1([&] { res = f(); }); // Capturing result to respective variable via lambda         std::thread t2([&] { res2 = f(); });         std::thread t3(

A concept to a product (Kimidori [ 黄緑]) - Part 2

In the previous part , we have seen KIMIDORI [ 黄緑] detect if a URL is malicious. In this part, we will see the details that KIMIDORI [ 黄緑] fetches out of the URL provided. As an example, provided a safe URL, https://www.azuresys.com/, and let's see what it brings out: As we can see, the link is safe and the link is active, which means we can just click on the link to open it on IE.  Now it's time to look into the URL report (still under development):  We have URLs IP, Location, and HTTP Status code. The Report part is a sliding window, the Show Report button shows as well as hides the report. Show / Hide Report is a toggle button. Let's see if we get the same details for any bad (phishing / malicious) URL: Took an URL example from a phishing link and tested it. The tool detected it as not a good link (Screen Shot Below) & link does not activate unlike a safe URL: Now let's see the report part for more details including domain registration details: It looks like it&