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several items, and you see the last thing to occur prior to an NSException is loading the view from the nib Follow the stack to row 12, click it, and you see the line of code in the view controller that was executed in the right pane (Figure 5-19) So you know trying to load the view from the nib caused the crash

Do your homework before you meet with a venture capitalist This means knowing in advance as much as you possibly can about his firm, background, prior board seats, and existing investments Time is money Come prepared and on time Keep your presentation short Typically, you will have less than one hour If you can t convey your message in 30 minutes, you re not ready for prime time If you re making a physical presentation, bring everything you need, including hard copies in case you

5:

Summary

Figure 5-19

Mac OS X programs are written in Objective-C, using technology from way back in the 1980s that has matured into a powerful set of tools. In this book, we ll start by assuming you know something about C programming and go from there. We hope you enjoy the ride!

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When an object is deallocated, if there are any objects with a reference to the deallocated object, they are no longer referencing a valid object Any messages sent to the deallocated object result in errors Often, the error is rather cryptic For instance, the following code fragment is obviously an error

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We get the cars from the garage, loop over them all, and evaluate each one against the predicate. This chunk of code prints the cars with highest horsepower:

FooBar * myFooBar = [[FooBar alloc] init]; NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects: myFooBar,nil]; [myFooBar dealloc]; [[myArray objectAtIndex:0] sayHello];

FooBar is allocated, initialized, and added to myArray There are two references to myFooBar, so its retainCount is two However, deallocating myFooBar makes both references invalid, pointing to deallocated memory space The sayHello message is sent to the first object in myArray the problem is that the object no longer exists Although in this simple example it is easy enough to surmise the cause of the error message, in a real application, finding this type of error s source is often difficult

Makes sense, no Before we go on, let s make sure we re clear about all the pieces of syntax involved. Take a good look at the car name call in the NSLog. That s using the Objective-C 2.0 dot syntax and is the equivalent of call [car name];. There s no magic involved. The predicate string here is "engine.horsepower > 150". engine.horespower is a key path, which might involve all sorts of magic under the hood.

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