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Figure 13-18. Selecting the start options From the Solution Explorer, right-click the BugListWorkflow project, and choose Set as StartUp Project. When debugging the solution, you ll want to execute this project, not the BugList project.

In Listing 11 2, data2 is allocated on line 3. This type of allocation is plain old standard C and is not typical in an Objective-C program, but its still very important to know and understand. Line 4 declares and allocates an Objective-C object, NSString. Line 7 deallocates the block of memory allocated from line 3. Line 8 sets the pointer to NULL. This is a good practice that is going to be explained in the next section. Line 9 releases the object that was allocated on line 4. The release message is a request to deallocate the object. The reason that release message is a request to deallocate memory has to do with the mechanism of how memory is managed for Objective-C objects. This mechanism is referred to as the retain/release model, or sometimes as reference counting. Reference counting makes using memory a little more efficient, because it allows the objects to know when it should be deallocated. It s a slightly better mechanism than completely managing memory manually. Line 10 is equivalent to line 8. Objective-C pointers can be set to NULL but its much better to set the pointer to nil. A nil object in Objective-C has a special meaning and can actually respond to a message. NULL does not have that same property.

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recursive calls, however, because they can easily lead to errors in which the script continues to call itself forever.

Visual Studio should display the workflow designer with a single activity named Workflow1InitialState. This is a StateActivity, and it contains a single activity called eventDrivenActivity1.

As you ve learned, a pointer is just a number that represents an address to memory. There are two special pointers that are worth mentioning. They really aren t pointers per se, but they represent an empty pointer a pointer that doesn t point to anything. These two pointers are NULL and nil. NULL is nothing more than zero, zilch, nada. Since pointers are just numbers that represent an address, an address of 0, or NULL, represents a pointer that logically points to nothing. Using an address of zero is a convention that modern computers use; computers do not allow any program to store something at the address 0 which makes using NULL to represent an empty or unused piece of memory much more meaningful. This is important to know because if memory allocation fails, the resulting pointer returned is NULL. NULL is also useful to

As it name suggests, a state machine workflow is designed by specifying the states of a workflow. A state represents a stable condition of the workflow. Often a workflow will be idle, waiting for something to happen. That idle condition is represented by a state. When that something occurs, there is some activity, and the result is that the workflow becomes idle again, usually in a different state. In the bug list scenario, when a bug is entered, it goes in to a pending state and waits. When the admin reviews the bug and assigns it, the bug then goes into an assigned state. Once again, the bug becomes idle waiting for the developer to work on it. The first step in designing a state machine workflow is to define these idle points, which you ll model using a StateActivity.

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