c# print barcode font Tell Me Where I Am: Location-Aware Applications in Visual Basic .NET

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Tell Me Where I Am: Location-Aware Applications
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Working with the Location API
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It is time to dive into the Location API. We ll do so while creating a Win32 console application that reads a location report, handles location events, and then prints this information to the console. Because the Location API is built on top of the Sensor API, the flow of applications that use the Location API is similar to the flow used in applications that use the Sensor API. The flow looks like this: Obtaining a location interface, ILocation, which is a COM interface. This is the main interface, and it provides methods used to manage location reports, event registration, and sensor permissions. Requesting permission for any location providers that are not enabled. Interacting with the location interface by reading location reports and handling location events.
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Understanding How the Location API Works
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ILocation is main interface through which you gain access to location reports, register for location events, and ask for location sensor permission. You can think about this interface as being equivalent to the ISensorManager interface found in the Sensor API (and described in detail in 9). However, there is one fundamental difference between the function that ISensorManager performs and the function ILocation does. The ISensorManager interface s main function is to provide you with a channel through which you can discover sensors that are connected to the computer and through which you can gain access to an individual sensor (to request permission for a sensor and obtain the ISensor interface). Then you can read the sensor s data report or register for events. On the other hand, the ILocation interface s main function is to provide methods to access location reports and to register for location change notification events. The difference between ISensorManager and ILocation is that the ILocation interface is used to access actual location data, in the form of location reports, and not just location sensors. You can think of the ILocation interface as a fa ade for all the location sensors. The main goal of the ILocation interface is to provide you with the most accurate and up-to-date location reports. You should not really care whether the data found in the location report originated from the GPS sensor or from an IP Resolver sensor, as long as the location report is accurate and up to date.
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The Location Platform performs all the heavy lifting for you, working with all the location sensors at the same time. It aggregates all the location information from all the enabled location sensors, and it presents you with a single location report that contains the most accurate location data, as shown in Figure 10-3.
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ILocation
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Location Platform
Location Data & Time Stamp
Sensor API 1 1 Location Sensor Location Sensor 1 Location Sensor
Figure 10-3 Location API process for retrieving accurate location information
The Location Platform reads sensor data reports from all enabled location sensors, as depicted by step number 1 in Figure 10-3. Then it calculates which sensor data report represents the most accurate location data. This can be done because the error radius value is found in each location sensor data report. The Location Platform also registers for data and status updates from all the enabled location sensors. Therefore, each time one of the enabled location sensors generates a data update event (ISensorEvents::OnDataUpdated), the Location Platform checks whether this new location sensor report contains more accurate location information than the already existing location report, again based on the error radius. If the new sensor location data report is more accurate than the existing one, the Location Platform caches the new sensor data report and its received time stamp, as shown by number 2. At this point, the Location Platform has new location information that is available to read (or to notify the user of) through the ILocation interface. When you read a location report using the ILocation interface, you receive the latest and most accurate location report, as shown by number 3.
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