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Passed function variables can be initiated and receive default values by naming and setting variables in the parentheses of the action. These variables are available throughout the action. Global variables, however, to be used by all actions in a controller can be created within the controller class as class attributes: var $myVar = 'Variable value'; Now, in any of the controller actions, I could use the $myVar attribute by placing $this-> before it:

- (IBAction) playSystemSound { AudioServicesPlaySystemSound(self.alertSoundID); }



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= "$command:\n" $stream = ssh2_exec( $connection, $command ); sleep(1); $output = stream_get_contents( $stream )"\n"; } print $output; print "Done\n"; fclose( $connection ); > You begin by setting necessary variables, including an array of the commands to be carried out (here, two: changing to a certain directory, and carrying out a Subversion update there) You connect using the ssh2_connect function, specifying the port to connect to, and providing appropriate messages You authenticate using the public key that you created previously with the ssh-keygen command You then step through the commands in the $commands array, executing each with the ssh2_exec function and sleeping for a moment to allow time for the command to be executed before sending another Finally, you display the results of the commands, and close the connection.





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However, we are going to use a different sound. We could also just employ the same pattern we went through to create and use the alert sound, but instead, we are going to do something a little different to demonstrate another feature. System Sound Services also provides an API that allows you to set up a callback that will be invoked immediately after your sound completes playing. So to demonstrate this API, rather than allocating a new sound resource that persists through the life of the program, we will load the resource on demand and release it when the sound finishes playing. AudioServicesAddSystemSoundCompletion() is the function you use to set up a callback. You provide the SystemSoundID of the sound you want on which you want a callback to be invoked. You also provide the callback function you want invoked. Then, if the sound is played, your callback function will be invoked after the sound finishes playing. The function takes additional parameters to describe the run loop and mode you are using. We will just be using the defaults (by passing NULL), since we are making a standard Cocoa Touch application and using the standard Cocoa run loop. And like most callback functions, it allows you to pass in any pointer for user data. We will not need that parameter in this example, but for those not familiar with the pattern, a common thing to do is pass self when in Objective-C, so you can get a pointer to the instance of your class in the callback function. First, we will define our custom callback function at the top of SystemSoundServicesViewController.m, before the @implementation, since this is just a C function, and not part of our class.

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static void MySoundFinishedPlayingCallback(SystemSoundID sound_id, void* user_data) { AudioServicesDisposeSystemSoundID(sound_id); }

function foo($bar = null) { $bar = $this->myVar; $this->set('output',$bar); } Be sure when creating your own class attributes that they don t conflict with other Cake properties like $scaffold or $helpers. Other local variables can be called within the action as in other PHP scripts: function foo() { $bar = 'hello world'; $this->set('output',$bar); }

In our case, we just take the SystemSoundID that was given to us and release the sound resource. Now let s implement our final playSystemSound method. The code should look very familiar to you, as it contains all the pieces you've already seen to load a sound resource and play it. The only difference is that now everything is done with local variables (not requiring instance variables), and we register a callback before we play the sound.

Before concluding this example, we want to remind you one more time that, in general, using a web application to execute remote commands is not very safe, because anyone anywhere may be able to exploit a vulnerability and carry out remote commands of their own (we discuss this issue at length in 5) For that reason, a script like this one should never be run except when you are absolutely sure that its environment is completely secure..

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