MICROSOFT_PRESS_EBOOK_PROGRAMMING_WINDOWS_8_APPS_WITH_HTML_CSS_AND_JAVASCRIPT_PDF

}
else
{
localSettings.Values["InternetProfile"] = profile.ProfileName;
}
var networkAdapterInfo = profile.NetworkAdapter;
if (networkAdapterInfo == null)
{
localSettings.Values["NetworkAdapterId"] =
"Not connected to Internet";
}
else
{
localSettings.Values["NetworkAdapterId"] =
networkAdapterInfo.NetworkAdapterId.ToString();
}
}
}
catch (Exception e)
{
// Debug output omitted
}
}
}
// Handles background task cancellation.
private void OnCanceled(IBackgroundTaskInstance sender,
BackgroundTaskCancellationReason reason)
{
// Debug output omitted
}
You can see that the Run method receives an argument through which it can register a handler for
canceling the task. The code above doesn’t do anything meaningful with this because the task itself
executes only a small amount of code. The C# tasks in the Background tasks sample, on the other hand,
simulate longer-running operations, in which case it uses the handler to set a flag that will stop those
operations.
Access to Additional APIs
Between the DOM API, WinJS, third-party libraries, and JavaScript intrinsics, JavaScript developers have
no shortage of APIs to utilize in their apps. At the same time, there is a whole host of .NET and
Win32/COM APIs that are available to C#, VB, and C++ apps that are not directly available to JavaScript,
including the DirectX and Media Foundation APIs.
With the exception of APIs that affect UI or drawing surfaces (namely Direct2D and Direct3D), WinRT
components can make such functions—or, more likely, higher-level operations built with
them—available to apps written in JavaScript.
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