UDP prototype » History » Version 6
Greg Burri, 07/01/2009 01:32 PM
| 1 | 1 | Greg Burri | h1. UDP prototype |
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| 3 | h2. Goals |
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| 5 | * Make a program which will listen for multicast message. |
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| 6 | 5 | Greg Burri | * It must be work between sub-networks (vlan). |
| 7 | 2 | Greg Burri | * It should be also able to send. User can type a message and all other peers will print it when it is sent. |
| 8 | 1 | Greg Burri | * Test it with some computers. |
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| 10 | 3 | Greg Burri | h2. Qt and UDP multicast |
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| 12 | There is no support to UDP multicast in QT4.5 according this bug issue : http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=57952. |
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| 13 | 6 | Greg Burri | |
| 14 | Maybe it can be possible to use "setsockopt()":http://linux.die.net/man/2/setsockopt with _QAbstractSocket::socketDescriptor()_. See http://linux.die.net/man/7/ip and options for multicast like _IP_ADD_MEMBERSHIP_. |
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| 16 | h2. Broadcast |
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| 18 | 3 | Greg Burri | An alternative is to use a broadcast address with _QHostAddress::Broadcast_. It will only work with IPv4. |
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| 20 | It's possible to use UDP multicast only with the low-level API. This solution is OS dependent and will not be accepted. |
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| 22 | For the moment the broadcast alternative will be used. |
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| 23 | 1 | Greg Burri | |
| 24 | h2. References |
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| 26 | * http://en.wikipedia.org/wiki/Multicast |