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The next thing an application might want to do is to display a list of people that are on its local subnet so the user can invite them to collaborative activity This is done by enumerating the people signed into the People Near Me infrastructure A user needs to be signed into People Near Me to retrieve this list of people near them To help with this process, we created a helper class that ensures that the user is signed in before the rst request class The class calls the Listing 1210 shows the method of the static class to ensure that the user is signed into People Near Me After the user is signed in, the user is free static method, which returns a collection of to call the instances A instance is a description of a person logged into People Near Me on the local subnet

In the previous section s rst subsection we created a handcrafted regex-based key value parser that was used by the playlistspy program to read pls les In this subsection we will create a parser to do the same job, but this time using the PyParsing module As before, the purpose of our parser is to populate a dictionary with key value items matching those in the le, but with lowercase keys An extract from a pls le is shown in Figure 144 (520 ), and the BNF is shown in Figure 145 (520 ) Since PyParsing skips whitespace by default, we can ignore the BNF s BLANK nonterminal and optional whitespace (\s*) We will look at the code in three parts: rst, the creation of the parser itself; second, a helper function used by the parser; and third, the call to the parser to parse a pls le All the code is quoted from the ReadKeyValuepy module le that is imported by the playlistspy program

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key_values = {} left_bracket, right_bracket, equals = map(Suppress, "[]=") ini_header = left_bracket + CharsNotIn("]") + right_bracket key_value = Word(alphanums) + equals + restOfLine key_valuesetParseAction(accumulate) comment = "#" + restOfLine parser = OneOrMore(ini_header | key_value) parserignore(comment)

The GraphicsdrawArc method draws the outline of a circular or elliptical arc bounded by the a rectangle whose origin is (x,y) and whose size is specified by the width and height The arc is drawn using the current color and stroke style, starting at startAngle degrees and extending for arcAngle degrees The start angle is interpreted such that 0 degrees is at the 3 o'clock position A positive angle indicates a counter-clockwise rotation, while a negative value indicates a clockwise rotation See the following example code and Figure 116

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Next we need to send an invitation to another user so he can collaborate The Peer Chat application sends an invitation to other users to start a chat together To do this, we not only need to send the invitation, we also need to send some additional information to bootstrap the communication process Remember that the actual act of communication between peers is handled by WCF and the peer channel infrastructure This means that we need additional information, such as the name of the mesh to communicate on and the mesh password This additional information is sent with the invitation Listing 1211 shows how to send and receive invitations from the collaboration infrastructure in Windows Vista An invitation is sent using or method on an instance of a either the class It is recommended that you use the method; otherwise, the user interface is blocked, waiting for the user to accept the invitation Both methods have an option to send additional data in the form of a byte array In our situation, we package up the mesh name and password into a byte stream and send that along Many might be concerned that information might be exposed by sending the mesh name and password with the invitation No worries! The People Near Me infrastructure transmits this information over an encrypted connection

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