WORKING WITH THE CAMERA AND PHOTOS in Word

Creation QR Code 2d barcode in Word WORKING WITH THE CAMERA AND PHOTOS

CHAPTER 16 WORKING WITH THE CAMERA AND PHOTOS
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Table 16 1. Launchers
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Launchers
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EmailComposeTask MarketPlaceDetailTask MarketPlaceDetailTask MarketPlaceReviewTask MarketPlaceSearchTask
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Opens the default device e-mail composer. Opens detailed product information. Opens to the Marketplace with specified category. Opens the product review for the specified product. Opens the MarketPlace search result based on the search term specified. Opens the default device MediaPlayer. Opens the Phone application with specified number ready to dial. Opens the default search application. Opens the messaging application. Opens the default device web browser to the specified URL.
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MediaPlayerLauncher PhoneCallTask SearchTask SmsComposeTask WebBrowserTask
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Table 16 2. Choosers
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Choosers
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CameraCaptureTask EmailAddressChooserTask PhoneNumberChooserTask PhotoChooserTask SaveEmailAddressTask SavePhoneNumberTask
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Opens the Camera application to capture the image. Opens the Contact application to choose an e-mail. Opens the Phone application to choose a phone number. Opens the Photo Picker application to choose the image. Saves the provided e-mail to the Contact list. Saves the phone number to the Contact list.
The Windows Phone Launchers and Choosers framework is a collection of APIs you can use to indirectly access core Windows Phone applications, like the phone or contact list, to perform a specific task. Launchers can launch a phone application but return no data. A chooser, such as a photo chooser, on the other hand, returns data to the application that calls it. Tables 16 1 and 16 2 list all of the launchers and choosers that ship with the Windows Phone platform today and how each is used. The CameraCaptureTask chooser launches the built-in Windows Phone camera application, allowing a user of
CHAPTER 16 WORKING WITH THE CAMERA AND PHOTOS
a third-party application to snap photos and for the application to retrieve them for its own purposes by handling the chooser s Completed event. You will write code to capture photos shortly, but before you do that, it s important to understand one more basic concept when working with launchers and choosers the application execution model and application tombstoning (for a look at the Windows Phone application life cycle, see 10 for more detail). As you know by now, the first version of the Windows Phone 7 platform does not support multitasking due to the excessive demands it puts on the battery and other resources on the device. Launchers and choosers are, in essence, separate applications that are launched from within your application. Since support for multitasking does not exist, your application effectively terminates when launchers or choosers are used. This termination is known as tombstoning, and it has direct implications on programming Windows Phone 7 devices that use launchers and choosers, such as the photo management applications you will build in this chapter. The difference between application tombstoning and application termination is that when an application is tombstoned, it is fully expected to be resumed upon completion of the launcher or chooser. Upon resuming, the application should continue in the same state that it was left off in, with data specific to the application session before tombstoning properly preserved. It is up to the application programmer to ensure that happens and that data gets properly restored.
Using a Chooser to Take Photos
The very first application that you will write will take photos and bring them inside your application. The first application will also lay the foundation for the rest of this chapter, since you will enhance and add features to this application as you go along. You will, therefore, create a basic navigation system in this first step for your application using an Application Bar and a standard set of icons that ship with Microsoft Expression for Windows Phone, which is one of the Windows Phone tools you installed in 2. You ll find the icons for a 32-bit system at C:\Program Files\Microsoft SDKs\Windows Phone\v7.0\Icons, or for a 64-bit system at C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.0\Icons. As has already been mentioned, you will use choosers to implement photo manipulation features on Windows Phone 7. To take photos, you will use the CameraCaptureTask chooser to take the photo and bring that photo inside your application. Follow this walkthrough to accomplish these tasks.
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