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Setting the property to nil automatically sends a release message to whatever object iVar1 was pointing to first. It s a very clean way to release an object. Line 5 shows how a nonproperty instance variable would be released. We ve used this method in many of our examples so far. Line 7 is one of the rare cases in which you would send a dealloc message to an object. In this case, the program is telling its parent (the superclass) to deallocate itself. The parent would end up doing the same, sending a dealloc to its parent and so on until the base object is finally deallocated. Also note that [super dealloc] is the last thing the method does it s not a good idea to deallocate the parent class and then continue to do more things. Dealing with the retain/release model will take some time to get used to but overall is a fairly straightforward system of managing memory. Here s a word of caution though: even though our examples talked about the retainCount method of an object, do not rely on this value. Since you have no idea what parts of the framework have an interest in your objects, the retain count could be higher than you expect. However, knowing about the retainCount is beneficial in troubleshooting a potential memory leak. Continue to practice working with the retain/release model, and make sure that you read the developer documentation when sending or receiving objects so that you know how the object in question is being handled.

We ve already done most of the hard work, so now it s time to put everything together into a playable game.

When the admin assigns this bug to a developer or marks it as Working as Designed, their work is done (for this task anyway), and the task should be marked complete. In 10, you implemented a custom form to enter a lunch order. When the form was submitted, you added a custom rule to mark the

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Allocating memory either through the standard C mechanisms or the Objective-C object allocation methods works most of the time. However, the programmer cannot assume that allocating an object or allocating memory works all the time. When memory allocation fails it s generally a sign that bigger problems are at hand, and the program may not be around too much longer (it will crash because of memory issues). However, even though the program may be getting into a bad state because it can t allocate memory, the program should ignore the signs. Here are some conventions that are used to test if memory allocation has failed:

task complete. In this project, you ll accomplish the same thing using the CompleteTaskActivity in your workflow. Drag a CompleteTaskActivity to the left branch (ifPendingWad), and rename it to completePendingWad. For the CorrelationToken, choose the existing pendingToken. Go to the Workflow1.cs code-behind file, and add the following method: private void completeTask_MethodInvoking(object sender, EventArgs e) { CompleteTask ct = (CompleteTask)sender; ct.TaskId = _taskId; } This code simply casts the sender parameter as a CompleteTask activity and updates the TaskId property using the _taskId class member. (Recall this was stored by the OnTaskChanged event handler). Go back to the workflow designer. In the Properties window, select MethodInvoking property, and select the completeTask_MethodInvoking method from the drop-down list. The completed Properties window should look like Figure 13-31.

All the games we ve made so far have benefited from sound effects, and this is no exception. As you saw in the previous chapter, sounds help the player to correctly interpret their interactions with the game. We ll add different sounds for when Pop hits a wall, a block, a Bigleg or Katch s shell, as well as when Pop falls out of the screen. Creating sound resources and playing them in the appropriate events: 1. Create sounds using the files Sound_wall.wav, Sound_block.wav, Sound_katch.wav, Sound_bigleg.wav, Sound_lost.wav, and Sound_click.wav, and give them appropriate names. 2. Play the wall sound in the Pop object s Collision event with the wall object. 3. Play the "block sound" in the Pop object's Collision event with the block object and the double block object. 4. Play the katch sound in the Pop object s Collision event with the Katch object. 5. Play the lost sound in the Pop object s Outside Room event. 6. Play the bigleg sound in the Bigleg object s Collision event with the Pop object. 7. Play the click sound at the top of the Left Pressed event of each of the button objects.

1 2 3 4 5 6 7 int main(void) { char *data2 = malloc(100); if (data2 == NULL) {// Malloc returns NULL (0x00000000) if allocation fails. // Application has detected a major failure. } }

Figure 13-31. The completed Properties window for the completePendingWad activity Now drag a CompleteTaskActivity to the ifPendingAssigned branch. This should be configured exactly like the first one, using the pendingToken and the completeTask_MethodInvoking method.

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