TAILIEUCHUNG - Finding and Fixing Run-Time Bugs

Tìm và Fixing Run-Thời gian Bugs Bạn đã làm cho nó thông qua quá trình xuất khẩu một ứng dụng mà không có một lỗi biên dịch-thời gian. Cho đến nay, như vậy tốt. Nhưng khi bạn bắt đầu làm việc với các ứng dụng xuất khẩu, bạn phát hiện ra rằng nó chỉ là không hoạt động đúng. | Finding and Fixing Run-Time Bugs You ve made it through the process of exporting an application without a compile-time error. So far so good. But as you begin to work with the exported application you discover that it s just not working properly. Perhaps displayed data is not correct text and graphics onscreen are not positioned correctly or when you press a button that s supposed to send information to the server nothing or the wrong thing happens. These kinds of bugs are known as run-time bugs because they re not obvious until the application is run and put through the ringer. Run-time bugs typically result from spelling or logic errors such as mistakenly referring to a movie clip instance named miMovie_mc instead of myMovie_mc or using a less-than operator rather than the intended greater-than operator in a conditional statement. Or a function might contain a script that s logically but not syntactically faulty so that when executed the function has a very bad effect on the rest of the application. Unfortunately information about these kinds of bugs doesn t automatically show up in the Output window a bit of sleuthing and logical deduction is required to find and eliminate such errors. Fortunately Flash provides several tools to help you perform various deductive reasoning tasks with your project while it plays. The two most widely used tools are the trace action and the Debugger. We ll look at both of these tools in the following sections. Using the trace action The trace action allows you to output a custom message to the Output panel in response to a script s execution. This is useful to get a behind-the-scenes look at how a script is functioning primarily to test interactivity and to output custom messages that tell you what s happening with the data in a movie at any point in time. Consider the following simple example. Imagine you want to place the following script on Frame 10 of your movie trace The movie is currently on Frame _currentframe When the movie

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