how to print barcode in vb.net 2008 All about Core Location in Objective-C

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All about Core Location
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you are G, you move the dot image and update its height label. To finish, you turn off the location update and then stop the animation of the activity indicator, which makes it disappear. Voila! You have a working altitude monitor (if you have an iPhone 3G, 3GS, or iPad 3G) and a nice combination of a few different SDK elements.
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10.4.4 Using the compass
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In addition to knowing your location, the iPhone 3GS has the ability to know what direction you re heading. This is because the iPhone 3GS has a built-in magnetic compass. With the addition of the CLHeading class to the Core Location framework, you can now determine your magnetic heading as well as your true heading. The magnetic heading uses the built-in magnetometer and points to magnetic north, whereas the true heading uses your current location and points to true north. Let s first examine the properties of the CLHeading class. Table 10.3 describes each of these properties.
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Table 10.3 Properties of CLHeading used for determining the device s heading Description The heading that points to magnetic north. This value uses the built-in magnetometer and contains a value from 0 to 360. Represents the heading that points to geographic north. This property relies on the current location and so isn t always guaranteed to be valid. It ranges from 0 to 360. This value represents the error in degrees of the magneticHeading. A low value means the heading is relatively accurate. A negative value means the heading is invalid and can t be trusted. The timestamp when the heading was found.
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Property magneticHeading
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trueHeading
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In addition to these properties, you have access to the raw geomagnetic data. These properties include the raw x, y, and z data, which you can use individually. Accessing the compass information is similar to accessing the GPS information. You first get a reference to the CLLocationManager object, and then you may begin collecting data:
- (void)viewDidLoad { CLLocationManager * locationManager = [[[CLLocationManager alloc] init] autorelease]; if (locationManager.headingAvailable == YES) { locationManager.delegate = self; [locationManager startUpdatingHeading]; } }
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Positioning: accelerometers, location, and the compass
You first create a new CLLocationManager to interact with the location data. The next line is required to ensure that the device supports the compass. The only devices that return YES here are the iPhone 3GS and the iPad. If this fails, it s a good idea to notify the user that their device doesn t support the compass. You then start the compass and begin sending data to the CLLocationManagerDelegate. In this case, the delegate is set to the caller class.
RETRIEVING DATA FROM THE COMPASS
To retrieve data from the compass, you must implement the CLLocationManagerDelegate method locationManager:didUpdateHeading:. This method is called automatically every time the compass heading changes on the device. The heading variable passed into this method contains all the data as described in table 10.3. Here s an example of how to implement this method:
- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)heading { self.heading = heading; }
This example isn t too exciting because it only localizes the heading variable to the heading class property. This is useful because you can now use the heading in other places in the code. The two most important properties of this heading variable are magneticHeading and trueHeading. These variables are of the type CLLocationDirection, which is a typedef double. This value ranges from 0 to 360 degrees. A reading of 0 degrees means the device is pointing north, 90 means east, 180 south, and 270 west. If this value is ever negative, that means it s invalid. Although the compass is a simple addition, it offers much power and flexibility within your applications. The addition has allowed for development of interesting apps, including navigation systems, augmented reality apps, and many others that depend on the user s orientation.
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