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We have used four bytes for the magic number and two for the version Endianness is not an issue because these will be written as individual bytes, not as the byte representations of integers, so they will always be the same on any processor architecture To write and read raw binary data we must have some means of converting Python objects to and from suitable binary representations Most of the functionality we need is provided by the struct module, brie y described in the sidebar The Struct Module ( 297), and by the bytes and bytearray data types, brie y described in the sidebar The Bytes and Bytearray Data Types (293 ) The bytes and bytearray classes methods are listed in Tables 71 ( 299) and 72 ( 300) Unfortunately, the struct module can handle strings only of a speci ed length, and we need variable length strings for the report and aircraft IDs, as well as for the airport, the aircraft type, and the narrative texts To meet this need we have created a function, pack_string(), which takes a string and returns a bytes object which contains two components: The rst is an integer length count, and the second is a sequence of length count UTF-8 encoded bytes representing the string s text Since the only place the pack_string() function is needed is inside the export_binary() function, we have put the de nition of pack_string() inside the export_binary() function This means that pack_string() is not visible outside the export_binary() function, and makes clear that it is just a local helper function Here is the start of the export_binary() function, and the complete nested pack_string() function:

Listing 520 shows client code that aggregates the work of the two services into a single transaction Three proxies are created, two pointing to one seroperations and the vice, the third pointing to another service The two operation are called on and then the operaone If everything goes well within those service operation is called on After both tions, they will each execute their to nish the transaction operations return, the client calls Only if all parties in the transaction execute their method will the transaction be committed; if they do not, the entire transacoperations are called with tion is rolled back Finally, two more to verify that the changes persist past the transaction

def export_binary(self, filename, compress=False): def pack_string(string): data = stringencode("utf8") format = "<H{0}s"format(len(data)) return structpack(format, len(data), data)

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In general, the requirements for the networking and storage libraries vary significantly from one resource-constrained device to another For instance, device manufacturers who are dealing with packet-switched networks typically want datagram-based communication mechanisms, while those dealing with circuit-switched networks require stream-based connections Due to strict memory limitations, manufacturers supporting certain kinds of networking capabilities generally do not want to support any other mechanisms All this makes the design of the networking facilities for CLDC very challenging, especially since J2ME configurations are not allowed to define optional features Also, the presence of multiple networking mechanisms and protocols is potentially very confusing to the application programmer, especially if the programmer has to deal with low-level protocol issues

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The strencode() method returns a bytes object with the string encoded according to the speci ed encoding UTF-8 is a very convenient encoding because it can represent any Unicode character and is especially compact when representing ASCII characters (just one byte each) The format variable is set to hold a struct format based on the string s length For example, given the string

Figure 513 shows output from a client and two services The client is on the left and prints the balance from savings and checking before and after the transfer The two services are on the right The top service is accessed by Proxy1 and Proxy3; the bottom one is accessed by Proxy2 The top service

The struct module provides structpack(), structunpack(), and some other functions, and the structStruct() class The structpack() function takes a struct format string and one or more values and returns a bytes object that holds all the values represented in accordance with the format The structunpack() function takes a format and a bytes or bytearray object and returns a tuple of the values that were originally packed using the format For example:

The challenges presented above have led to the generalization of the J2SE networking and I/O classes The high-level goal for this generalized design is to be a precise functional subset of J2SE classes, which can easily map to common low-level hardware or to any J2SE implementation, but with better extensibility, flexibility, and coherence in supporting new devices and protocols

data = structpack("<2h", 11, -9) items = structunpack("<2h", data) # data == b'\x0b\x00\xf7\xff' # items == (11, -9)

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