try catch

最新推荐文章于 2023-12-19 07:26:18 发布

翻译最新推荐文章于 2023-12-19 07:26:18 发布 · 1.3k 阅读

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#powerbuilder #object #properties #exception #application #types

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本文介绍了PowerBuilder中的异常处理机制，包括TRY、CATCH及FINALLY等关键字的使用方法。详细解释了RuntimeError对象及其继承自Throwable对象的特点，并列举了几种特定类型的运行时错误，如DivideByZeroError和NullObjectError。

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TRY
    trystatements
CATCH ( ThrowableType1 exIdentifier1 )
    catchstatements1
CATCH ( ThrowableType2 exIdentifier2 )
    catchstatements2
...
CATCH ( ThrowableTypeN exIdentifierN )
    catchstatementsN
FINALLY
    cleanupstatements
END TRY

The RuntimeError object inherits from the Throwable object and is used by the PowerBuilder virtual machine (PBVM) to throw runtime errors. Runtime errors are also called unchecked exceptions. You do not need to declare where they might be thrown and you do not need to catch them as you do checked exceptions.
When a RuntimeError is thrown, its properties are populated automatically with the runtime information associated with the line where the error occurred. If a RuntimeError is not handled, the Application object SystemError event is triggered and the global Error object is populated with the runtime information.

The following derived types provide more robust error-handling capabilities:

?DivideByZeroError - thrown when an attempt is made to divide by zero.
?NullObjectError - thrown when an attempt is made to access an object using a null reference.
?PBXRuntimeError - thrown when an unknown error occurs in a PowerBuilder extension.
?CORBASystemException - thrown when a CORBA system exception is thrown from EAServer.
?DWRuntimeError - thrown when a DataWindow error occurs that is not handled by an Error event script.

?OLERuntimeError - thrown when an OLE error occurs that is not handled by an ocx_error, ExternalException, or Error event script