how to print barcode in vb.net 2008 Preparing audio files in Objective-C

Encoder Quick Response Code in Objective-C Preparing audio files

16.3.4 Preparing audio files
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As noted before, when a push notification is received, it can invoke the playback of an audio file included with your application. There are many interesting scenarios in which different audio files may be appropriate. For example, during a chess match, if a player receives a notification informing them that it s their turn, the system might play the default audio file. But if they receive a notification related to a piece being captured, the system might play some sort of battle sound effects. The more creative you get with this, the more value you add to your application. The first thing to note when considering the audio file to play is the fact that the file must be stored in your application s main bundle directory. This is the root folder in which your applications files are stored. Your audio file must be in AIFF, WAV, or CAF format and is limited to 30 seconds. In order to convert the audio file to one of these formats, you must use the afconvert command on your Mac. To do this, open the terminal and navigate to the directory containing the audio file you wish to convert. Next, type the afconvert command followed by -f caff -d
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Push notification services
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Figure 16.7 Converting audio files in the terminal
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LEI16 {INPUT} {OUTPUT}. The following shows an example of using this command to
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convert the file track2.mp3 to track2.caf (see figure 16.7):
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/usr/bin/afconvert -f caff -d LEI16 track2.mp3 track2.caf
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You ll need to do this for every sound file you wish to invoke from a push notification. Now that your application is ready to receive push notifications, we can discuss a method for creating a push notification provider using the PHP programming language.
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16.4 Creating a push notification provider in PHP
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Push notification providers can be implemented in many different ways. Plenty of open source scripts are available for you to use in your applications; but we ll show you a simple way to implement your own using PHP. This book isn t about PHP development, so we won t go into much detail about the code. But we ll explain the process at a high level to help you understand it. The first step is to create an SSL certificate.
16.4.1 Creating the SSL certificate
Before you can begin coding, you must generate an SSL certificate to communicate with Apple. You ll create this certificate in the terminal using your push certificate and the private key that you generated in section 14.3. Here are the steps required to generate this certificate:
1 2 3
Open your keychain. Click My Certificates. Click the arrow next to the Apple Development Push Services certificate, to expand it. Ctrl-click the certificate, and select Export (see figure 16.8). Save this certificate as apns_cert.p12. Do the same thing with the private key, and name it apns_key.p12. Note that you ll be prompted for a password when exporting. Make it something simple, because you ll need it later.
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Creating a push notification provider in PHP
Exporting your Apple developer certificate
You need to merge the key and the certificate and convert the merged file to the .pem format. This allows your PHP application to load it. Open the terminal, navigate to the location of your certificate and key, and type the following commands:
openssl pkcs12 -clcerts -nokeys -out apns_cert.pem -in apns_cert.p12 openssl pkcs12 -nocerts -out apns_key.pem -in apns_key.p12
To remove the passphrase on your apns_key.p12 file, type the following command:
openssl rsa -in apns_key.pem -out apns_key_unenc.pem
The last thing you need to do is merge these two files using the cat command. Type the following command into the terminal:
cat apns_cert.pem apns_key_unenc.pem > apns.pem
Make sure you keep track of all these files, because you may need to do this again if you change your APNS provider server.
NOTE
This process is exactly the same for development and production.
Now that you ve generated this certificate, upload it to the server, and place it in the directory where you ll be putting the provider script.
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Push notification services
16.4.2 Implementing the PHP push notification provider
A quick Google search reveals that quite a few free libraries are available to help you interface with Apple s push servers. Although it s recommended that you use a premade solution, we ll show you how to write your own. The code for sending a push notification to Apple s server is simple. You need to make an SSL connection and send the data in the form of JSON. As we mentioned in section 16.2, JSON data is a form of a dictionary. Apple uses this data to create an NSDictionary that is sent to the device. Listing 16.1 shows the code in PHP to send a push notification to Apple.
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