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The value will be returned to the variable input_available. The variable will be set to 1 if input is available or 0 if no input is available. AudioSessionGetProperty() takes a key constant as the first parameter, the size of the return variable, and a pointer to the return value. This is a common pattern in Core Audio. Core Audio likes to use generic functions for *GetProperty() and *SetProperty() so they can be reused for different things. Since the API is C-based, this is achieved by passing pointers with size information and a key constant. Audio Session Services provides a property listener callback API, which you can set to monitor property changes of specific supported types. As an example, we will set up a simple property listener that triggers if an input device comes or goes.



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AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, MyPropertyListener, self);

$query .= "'"; 4. The value of $query was therefore (with the user input in bold type) this:





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ne of Cake s selling points is its ease of installation. At this point I could add a long tutorial explaining how to install Cake for every possible server configuration, but I won t. Cake should be simple enough to install, and if you do experience trouble getting off the ground with it, chances are the problem lies in a more unduly complex server configuration. Appendix A addresses some of the choices beginners make in setting up a localhost environment in case you run into installation questions during this chapter. By and large, any troubles getting Cake to work are due to localhost issues, not enterprise server or web service provider setups. Throughout this book, you will develop some Cake applications that I expect you to build on your PC and not on a web server. All my instructions, therefore, will be for a localhost environment, not a remote one, though the setup routines I discuss in this chapter apply to a remote installation as well.

MyPropertyListener is defined as follows:

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void MyPropertyListener(void* user_data, AudioSessionPropertyID property_id, UInt32 data_size, const void* property_data) { if(kAudioSessionProperty_AudioInputAvailable == property_id) { if(sizeof(UInt32) == data_size) { UInt32 input_is_available = *(UInt32*)property_data; if(input_is_available) { printf("Input is available\n"); } else { printf("Input is not available\n"); } } } }

SELECT * FROM wines WHERE variety = 'lagrein' The success of this construction depended on the user s input. In this case, you were expecting a single word (or possibly a group of words) designating a grape variety, and you got it. So the query was constructed without any problem, and the results were likely to be just what you expected, a list of the wines for which the grape variety is lagrein. Let s imagine now that your user, instead of entering a simple grape variety like lagrein (or even pinot noir ), enters the following value (notice the two punctuation marks included): lagrein' or 1=1; You now proceed to construct your query with, first, the invariable portion (we show here only the resultant value of the $query variable): SELECT * FROM wines WHERE variety = ' You then concatenate that with the value of the variable containing what the user entered (here shown in bold type): SELECT * FROM wines WHERE variety = 'lagrein' or 1=1; And finally you add the closing quotation mark: SELECT * FROM wines WHERE variety = 'lagrein' or 1=1;'

Notice that the setup for a property listener callback is very similar to that of all the other callbacks you have seen so far.

AVFoundation, discussed in the next section, also includes a partial Objective-C interface for audio sessions. The API is fairly straightforward. Perhaps the most interesting difference is that rather than registering callback functions, AVFoundation uses a standard Cocoa delegate pattern, so you just need to implement the methods and set the delegate if you want the callbacks.

Controller callbacks make it possible to perform logic before or after launching an action. For example, say you launched the View action in the Posts controller. Before the View action is run by the controller, certain callbacks are checked for any content. By placing code in these callback actions, you can perform some logic for any and all actions before the action is executed, after it is executed, or just before the view is rendered. Let s say you wanted to restrict access to the View action; you could accomplish this in a callback action.

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