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We know from Piece #3 that individual items in a sequence, and therefore individual characters in a string, can be extracted using the item access operator ([]) In fact, this operator is much more versatile and can be used to extract not just one item or character, but an entire slice (subsequence) of items or characters, in which context it is referred to as the slice operator First we will begin by looking at extracting individual characters Index positions into a string begin at 0 and go up to the length of the string minus 1 But it is also possible to use negative index positions these count from the last character back toward the rst Given the assignment s = "Light ray", Figure 21 shows all the valid index positions for string s

s[-9] s[-8] s[-7] s[-6] s[-5] s[-4] s[-3] s[-2] s[-1]

s[0]

The scalability and optional use of the API is crucial for the successful deployment of the API in mobile devices It is clear that not all implementations of MMAPI will support all multimedia types and input protocols For example, some of the devices may support only playback of local audio files The design of the MMAPI allows implementations to provide optional support for different media types and protocols

.

s[1]

s[2] s[3]

s[4] s[5]

As with the MIDP 20 Sound API, class Manager provides the getSupportedContentTypes and getSupportedProtocols methods to query for supported media types and protocols An application can also attempt to create a Player from class Manager given the media input If the content type or the protocol specified is not supported, the Player creation methods will throw an exception

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Duplex Operations Request-response communication is the most prevalent message-exchange pattern between a client and the service Communication is initiated on the client, the client sends a request message to the service, and then the service sends a response message back to the client If the response is expected quickly, this can be implemented synchronously, so the client application blocks waiting for the response If a delay is expected between the request and the response, a request-response pattern can be implemented asynchronously on the client using standard NET techniques In that case, WCF returns control to the client application immediately after sending the request to the service When the response is received from the service, a NET callback routine is called to complete the WCF reply However, what if the service needs to initiate a message, such as a noti cation or an alert What if the client and service need to correlate information at a level higher than the individual message, where numerous requests sent from the client are correlated to one response sent by the service What if a request is expected to take ten minutes to complete WCF enables bidirectional communication through duplex service contracts A duplex service contract implements the duplex message pattern, in which unsolicited messages can be sent in either direction after the communication channel is established Operations over a duplex channel can be request-reply or one-way Because messages can ow in either direction, from client to service or service to client, both parties need an address, binding, and contract de ning where, how, and what messages can be sent To facilitate messages owing back from the service to the client, WCF may create an additional channel If the initial channel cannot support bidirectional communication, then WCF creates a second channel, using the same protocol as was speci ed by the service s endpoint, making the protocols symmetrical in both directions This is illustrated in Figure 26 Depending on the binding used when establishing the session from the client to the service, WCF will create one or two channels to implement the duplex message pattern For protocols that support bidirectional communication, such as named pipes and TCP, only one channel is required For those that don t support bidirectional communication, such as http, WCF creates an additional channel for communication from the service back to the.

s[6]

s[7] s[8]

Negative indexes are surprisingly useful, especially -1 which always gives us the last character in a string Accessing an out-of-range index (or any index in an empty string) will cause an IndexError exception to be raised The slice operator has three syntaxes:

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