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Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and a Client
app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
Create and store video and audio recordings of workout routines.
View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
Browse a list of the trainer’s workout recordings.
Record workouts by using the built-in webcam.
Play, pause, restart, and stop workout recordings.
If the capability is supported, allow the client’s webcam to pan as the client moves around
the room.
Upload workout recordings for trainer review.
Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Personal Trainer and Client apps must meet the following technical requirements:
Connect to the Internet.
Store workout recordings in the cloud.
Enable retrieval of workout recordings by using a custom URL.
Encapsulate the video player in a custom control.
Identify the maximum zoom of the user’s webcam in millimeters.
Store client profiles in XML files in the trainers’ Documents folders to allow for disconnected
editing.
Synchronize the XML files with cloud storage by using a background task when the Internet
is available.
Send trainer workout videos to cloud storage by using a background task when the trainer’s
device is idle. Indicate the status of the upload operation each time the trainer starts the app.
Suspend the background task when the Internet is not available.
Separate business and complex logic into WinMD components. The solution debugging
settings must include the WinMD components.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
Windows 8
Webcam, microphone, and speakers
Internet connection
While testing the apps, you identify the following issues:
When you start the app for the first time, the system displays this warning message: “This
app needs permission to use your camera, which you can change in the app’s settings.”
When you run the loadClientProfile( ) method in the clientData.js file, you receive an “Access
Denied” exception.
The findCamera( ) method in the video.js file throws an exception on some devices.
The recordVideo( ) method in the video.js file throws an exception when the device does not
support tilting.



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You need to debug the error that is displayed in the warning message. What should you do?

A.
In the package.appxmanifest file, set the Webcam property in the Capabilities list.

B.
Insert the following code segment at line VD18:
var dialog = new Windows.Media.Capture.CameraCaptureUI( );
dialog.photoSettings.enableCamera( );

C.
In the package.appxmanifest file, add Camera Settings to the available declarations.

D.
Insert the following code segment at line VD18:
var dialog = new Windows.Media.Capture.CameraCaptureUT( );
dialog.videoSet tings.enableCamera ( ) ;