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How to create your own Function for Async operation in c++ UWP?


By : Bang Jenggot
Date : October 18 2020, 08:10 AM
I wish did fix the issue. From this, All the examples are using Windows's own function for Async operation. , This
code :
    int a = 1;
    int b = 2;

    auto workItem = ref new Windows::System::Threading::WorkItemHandler([this, a, b](IAsyncAction^ workItem)
    {
        Platform::String ^ updateString = (a+b).ToString();

        //UI update
        Windows::ApplicationModel::Core::CoreApplication::MainView->CoreWindow->Dispatcher->RunAsync(
            Windows::UI::Core::CoreDispatcherPriority::High,
            ref new Windows::UI::Core::DispatchedHandler([this, updateString]()
        {
            textBlock->Text = updateString;
        }));
        //END UI upate
    });

    auto asyncAction = Windows::System::Threading::ThreadPool::RunAsync(workItem);
    int inputPrime = platformSting2Int(textBox_primeCheck->Text);
    std::shared_ptr<bool> isItPrime = std::make_shared<bool>(true);

    auto workItem = ref new Windows::System::Threading::WorkItemHandler([this, inputPrime, isItPrime](IAsyncAction^ workItem)
    {
        *isItPrime = IsPrime(inputPrime);//IsPrime() is my custom function
    });

    auto asyncAction = Windows::System::Threading::ThreadPool::RunAsync(workItem);

    asyncAction->Completed = ref new Windows::Foundation::AsyncActionCompletedHandler([this, isItPrime](IAsyncAction^ asyncInfo, AsyncStatus asyncStatus)
    {
        if (asyncStatus == AsyncStatus::Canceled) return;

        Platform::String ^ updateString = "is not prime.";
        if(*isItPrime) updateString = "is prime.";

        //UI update
        Windows::ApplicationModel::Core::CoreApplication::MainView->CoreWindow->Dispatcher->RunAsync(
            Windows::UI::Core::CoreDispatcherPriority::High,
            ref new Windows::UI::Core::DispatchedHandler([this, updateString]()
        {
            textBlock_primeCheckResult->Text = updateString;
        }));
        //END UI upate
    });


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In C# .NET, does an async operation necessarily create a thread that blocks?


By : swoopDogg
Date : March 29 2020, 07:55 AM
it helps some times In .NET Framework, there are many ways to implement an asynchronous operation: by using thread, thread pool, BeginXxx and EndXxx methods, event based APM, or Task based APM.
Each async pattern has its own internal implementation and all these Asynchronous Programming Models are explained at this blog article, including the traditional BeginXxx and EndXxx async pattern.

How to create an async/background process within a WCF operation?


By : catmarkedcards
Date : March 29 2020, 07:55 AM
this will help This can be accomplished pretty easily using any number of threading techniques.
For a very simple example, try modifying this:
code :
// Log something going on.
System.Threading.ThreadPool.QueueUserWorkItem((args) =>
{
   System.Diagnostics.EventLog.WriteEntry("my source", "my logging message");
});

Exception: Can't start async operation (refresh inventory) because another async operation(launchPurchaseFlow) is in pro


By : indrajit
Date : March 29 2020, 07:55 AM
this one helps. I had a similar problem. Unfortunately the IabHelper code is not great... it's mostly good, but the threading model is kind of messy, which means it can become confusing how to properly handle the edge cases.
An easy way to get rid of the crashes is to simply wrap the method call with an if-statement check like:
code :
if (!mHelper.isAsyncInProgress()) {
    mHelper.launchPurchaseFlow(...);
}

Returning from a function once an async operation is done


By : user2199366
Date : March 29 2020, 07:55 AM
help you fix your problem Personally, RxJava is overkill. All you need is to pass in the continuation function as a parameter
code :
class Validator {
    void validate(DataListener dl){
        DataProvider.getInstance(dl);
    }

Android in-app billing: Can't start async operation because another async operation (is in progress)


By : Alfred Elkerbout
Date : March 29 2020, 07:55 AM
will be helpful for those in need A simple tricky solution
before calling purchaseItem method just add this line
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