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Drawer Denso QR Bar Code in VB.NET The following image shows the Virtual Light Sensor that ships in the Windows 7 SDK.

The following image shows the Virtual Light Sensor that ships in the Windows 7 SDK.
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Introducing Windows 7 for Developers
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In this chapter, you were introduced to the Sensor and Location platform in Windows 7. By now, you should understand what a sensor is and how sensors interact with the operating system and with your application. First, you need to obtain a sensor by reviewing all the available sensors, and then you can try reading the sensor data, changing sensor properties, or registering to receive notifications from the sensor. We focused on the Sensor API, and you saw both native and managed code implementations. Last, we explained some reasons and techniques for creating a light-aware application that optimizes the way content is displayed. In the next chapter, we ll focus on the location part of the Sensor and Location platform.
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Tell Me Where I Am: LocationAware Applications
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In the previous chapter, you were introduced to the Sensor API of the Sensor and Location Platform. This chapter talks about the second part of that platform, known as the Location API. The Location API is built on top of the Sensor API and focuses on providing an answer to a single question: Where am I Or, more specifically, what is my current, most up-todate, location In this chapter, you will learn the reasons for having a dedicated set of APIs only for Location, as a subset of the Sensor and Location Platform. You will learn how the Location API uses the Sensor APIs to provide a higher level of abstraction for developers. Then we dive into the API and go through the specifics of working with the Location API to create a console application that prints your current location geo-coordinates and address. Although the Location API can be viewed, and certainly learned, as an independent set of APIs, some concepts in this chapter are based on the Sensor API and are explained in great detail in 9, Introduction to the Sensor and Location Platform. Therefore, we recommend that you review that chapter first to get a complete picture of the entire platform.
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Why Location Awareness Is So Important
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Let s begin with a short explanation of why a different set of APIs is used just for getting location information. Location-based services are becoming very popular on mobile devices because they offer great productivity gains and ease of use. Because more and more mobile PCs are being sold, it makes sense to add a location API to Microsoft Windows. Location awareness can enable some interesting scenarios. For example, when you re traveling to a different time zone, it would be nice if your computer automatically detected the change in location and adjusted the time, just as many mobile phones do today. Similarly, it would be nice if all other location-related information changed also, such as weather information. Another nice feature would be automatic geo-tagging of photos or any other information related to your location. When I am on the road, I like to taste local cuisine; it would be helpful to be able to just type Great Italian restaurants within a 5-mile radius in the browser search box and press Enter. The returned results would then display Italian restaurants within a five-mile radius of my current location. There are other implementations for location-aware functionality, such as security. For example, imagine a computer that works or provides some unique functionality only when
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234 Introduction to Windows 7 for Developers
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located in a specific and predefined area. With the Location API, the computer knows its location and can detect changes. If the computer leaves the allowed area, it notifies the user and eventually locks the specific features. Other scenarios include tracking inventory or managing large computer deployments in an IT organization. Imagine computers knowing their exact location based on Internet Protocol and the triangulation of Wi-Fi hot spots. There are more obvious applications of this functionality, such as navigation. For example, Microsoft Street and Trips displays an interactive map showing your current location based on Global Positioning System (GPS) provider (device). But when running on Windows 7, such applications can use the Location Platform and other location providers, rather than just being bound to a physical GPS device. These are just a few examples of location-aware applications. They illustrate common scenarios that can be incorporated into many existing applications and are therefore good reasons for Microsoft creating a specific Location API. Because the Location API is based on the Sensor API, it inherits all of the Sensor API capabilities that we described in the previous chapter. This includes concurrency, or enabling multiple applications to access location information at the same time. Also, because the Location API is based on the Sensor API, there is no need for you to learn vendor-specific APIs for a GPS device or even an IP resolver. You just use the simple API that the platform provides.
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