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Asynchronous Loading Text Files in Metro/C++/DirectX Apps

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Asynchronous Loading Text Files in Metro/C++/DirectX Apps

· Mobile Zone
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Discover how to focus on operators for Reactive Programming and how they are essential to react to data in your application.  Brought to you in partnership with Wakanda

By just adding a simple modification to the existing ReadDataAsync function, we can load text files asynchronously:

inline Concurrency::task<Platform::String^> ReadStringAsync(Platform::String^ filename)
{
using namespace Windows::Storage;
using namespace Concurrency;

auto folder = Windows::ApplicationModel::Package::Current->InstalledLocation;

task<StorageFile^> getFileTask(folder->GetFileAsync(filename));

auto readBufferTask = getFileTask.then([] (StorageFile^ f)
{
return FileIO::ReadBufferAsync(f);
});

auto byteArrayTask = readBufferTask.then([] (Streams::IBuffer^ b) -> Platform::String^
{
return Streams::DataReader::FromBuffer(b)->ReadString(b->Length);
});

return byteArrayTask;
}

You can load files using the following code (don’t forget it is asynchronous.

auto loadTextTask = ReadStringAsync(L"Assets\\Text.txt")
                                   .then([this](Platform::String^ text)
{
    m_text = text;
});

Enjoy!

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Published at DZone with permission of Toni Petrina, DZone MVB. See the original article here.

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