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This works because EnvironmentError is the base class for both IOError and OSError In 8 we will show a slightly more compact idiom for ensuring that les are safely closed, that does not require a finally block

The event-driven launch of MIDlets is subject to the security policy of a device, and this feature can be enabled and disabled at the discretion of the user [ Team LiB ]

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Disconnected applications are ones in which the client can function without connectivity to the server, but not all features are available in that mode Disconnected applications must cache data locally, must communicate in some asynchronous manner, and must persist any messages so they can be delivered when connectivity is reestablished Persisted queues are a common technique for building disconnected applications Queues can be implemented in a le system as a series of folders and les, in a relational database as rows in a table, or using special purpose software Regardless of the technique, queues offer many advantages, such as inherent asynchronous messaging and automatic load leveling WCF offers the capability for communication through queues using Microsoft Message Queue (MSMQ) There are two bindings available to and The use with MSMQ: binding is used when you are developing a new application that wants to use WCF and MSMQ as a transport The binding is used for interoperability with an existing MSMQ application

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Exceptions provide a useful means of changing the ow of control We can take advantage of this either by using the built-in exceptions, or by creating our own, raising either kind when we want to There are three syntaxes for raising exceptions:

When the rst syntax is used the exception that is speci ed should be either one of the built-in exceptions, or a custom exception that is derived from Exception If we give the exception some text as its argument, this text will be output if the exception is printed when it is caught The second syntax is a variation of the rst the exception is raised as a chained exception (covered in 9) that includes the original_exception exception, so this syntax is used inside except suites When the third syntax is used, that is, when no exception is speci ed, raise will reraise the currently active exception and if there isn t one it will raise a TypeError

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MSMQ offers support for building distributed applications using queues WCF supports communication through MSMQ queues as the underlying binding The binding transport for the allows clients to post messages directly to a queue and services to read messages from a queue There is no direct communication between the client and server; therefore, the communication is inherently disconnected It also means that all communication must be one-way Therefore, all operations property set on the operation contract must have the

Custom exceptions are custom data types (classes) Creating classes is covered in 6, but since it is easy to create simple custom exception types, we will show the syntax here:

The base class should be Exception or a class that inherits from Exception One use of custom exceptions is to break out of deeply nested loops For example, if we have a table object that holds records (rows), which hold elds (columns), which have multiple values (items), we could search for a particular value with code like this:

Security in mobile devices presents many interesting and significant challenges Mobile devices must enable users to take advantage of the applications and services provided on the Internet while still protecting them and their data

found = False for row, record in enumerate(table): for column, field in enumerate(record): for index, item in enumerate(field): if item == target: found = True break if found: break if found: break if found: print("found at ({0}, {1}, {2})"format(row, column, index)) else: print("not found")

It is common to automatically create MSMQ queues dynamically for binding This is especially true when use with the building disconnected client applications where the queue resides on static method of a user s desktop This can be done using the class the

The 15 lines of code are complicated by the fact that we must break out of each loop separately An alternative solution is to use a custom exception:

class FoundException(Exception): pass try: for row, record in enumerate(table): for column, field in enumerate(record): for index, item in enumerate(field): if item == target: raise FoundException() except FoundException: print("found at ({0}, {1}, {2})"format(row, column, index)) else: print("not found")

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