By David Makofske, Kevin Almeroth
Multicast Sockets: sensible consultant for Programmers is a hands-on, application-centric method of multicasting (as against a network-centric one) that's full of examples, principles, and experimentation. every one instance builds at the final to introduce multicast ideas, frameworks, and APIs in an attractive demeanour that doesn't burden the reader with plenty of concept and jargon. The publication is an advent to multicasting yet assumes that the reader has a history in community programming and is educated in C or Java. After interpreting the booklet, you could have an organization take hold of on the right way to write a multicast software.
* writer staff of teacher and alertness programmer is mirrored during this wealthy tutorial and sensible method of the topic material
* in basic terms e-book on hand that gives a transparent, concise, application-centric method of programming multicast functions and covers numerous languages-C, Java, and C# at the .NET platform
* Covers very important themes like provider types, trying out reachability, and addressing and scoping.
* contains a variety of examples and routines for programmers and scholars to check what they've got realized
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Extra info for Multicast Sockets: Practical Guide for Programmers
4. Join the multicast group using an IGMP IP_ADD_J~MBERSHIP setsockopt() call. 5. Receive data using recvfrom(). 6. Drop the multicast group using an IGMP IP_DROP~MBERSHIP setsockopt() call (optional). 7. Close the socket using close(). c Lines 1-8: Include h e a d e r s for socket p r o g r a m m i n g . The exact include h e a d e r s for a s y s t e m m a y vary; check the local s y s t e m manuals. Lines 10-36: Basic variable declaration a n d a r g u m e n t parsing. Lines 38-45: Validate that the p o r t i n p u t is in the valid range for u s e r applications (1024 to 65535).
The arguments are the socket descriptor, a pointer to a buffer where the contents of the packet (message) can be stored, the m a x i m u m size of the buffer, any socket flags, 5 a pointer to an address structure that will be populated with the source address that the packet was received from, and a reference to the length of the source address structure. By default, recvfrom() is a blocking call, meaning recvfrom() will not return until packets are received or it is interrupted in some manner.
This also has the side effect that neither a particular address nor a port needs to be associated with a UulticastSocket instance. In fact, the default constructor for UulticastSocket does not need to take any arguments. A MulticastSocket can be created and then used to send ten packets to that socket, all with different destinations. The following is an example of how to populate a DatagramPacket. DatagramPacket extends Object Selected Constructors: DatagramPacket(byte buf, int length, InetAddress address, int port) DatagramPacket(byte buf, int offset, int length, InetAddress address, int port) There are more DatagramPacket constructors, but we are going to primarily use these two for creating new multicast packets.
Multicast Sockets: Practical Guide for Programmers by David Makofske, Kevin Almeroth