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Exceptions
An exception is raised when
an error or other event interrupts normal execution of a program. The exception
transfers control to an exception handler, which allows you to
separate normal program logic from error-handling. Because exceptions are
objects, they can be grouped into hierarchies using inheritance, and new
exceptions can be introduced without affecting existing code. An exception can
carry information, such as an error message, from the point where it is raised
to the point where it is handled.
When an application uses the SysUtils
unit, all runtime errors are automatically converted into exceptions. Errors
that would otherwise terminate an application such as insufficient memory,
division by zero, and general protection faults can be caught and handled.
Raising and handling
exceptions
Standard exception classes and routines
See also
译文
异常
当错误或者其他事件中断程序的正常执行时，异常（exception）被引发。异常把程序控制传递给异常处理程序（exception handler），这就允许开发者能将正常的程序逻辑与错误处理分开。因为异常是对象，所以可以通过继承将它们分组到多个层次，并且可以引入新的异常而不一向既有代码。异常可以携带信息，如错误消息，携带的信息在异常引发的点到其被处理的点之间一直有效。
应用程序使用了SysUtils单元时，所有的运行时错误都会自动地转换成为异常。其他终止应用程序的错误，如内存不足、零除、一般的保护错误等，都可以被截获和处理。