| src/examples/cpp03/multicast/receiver.cpp | src/examples/cpp11/multicast/receiver.cpp |
|---|
| ⋮ | ⋮ |
| 1 | // | 1 | // |
| 2 | //·receiver.cpp | 2 | //·receiver.cpp |
| 3 | //·~~~~~~~~~~~~ | 3 | //·~~~~~~~~~~~~ |
| 4 | // | 4 | // |
| 5 | //·Copyright·(c)·2003-2023·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com) | 5 | //·Copyright·(c)·2003-2023·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com) |
| 6 | // | 6 | // |
| 7 | //·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying | 7 | //·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying |
| 8 | //·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt) | 8 | //·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt) |
| 9 | // | 9 | // |
| 10 | | 10 | |
| | 11 | #include·<array> |
| 11 | #include·<iostream> | 12 | #include·<iostream> |
| 12 | #include·<string> | 13 | #include·<string> |
| 13 | #include·"asio.hpp" | 14 | #include·"asio.hpp" |
| 14 | #include·"boost/bind/bind.hpp" | |
| 15 | | 15 | |
| 16 | const·short·multicast_port·=·30001; | 16 | constexpr·short·multicast_port·=·30001; |
| 17 | | 17 | |
| 18 | class·receiver | 18 | class·receiver |
| 19 | { | 19 | { |
| 20 | public: | 20 | public: |
| 21 | ··receiver(asio::io_context&·io_context, | 21 | ··receiver(asio::io_context&·io_context, |
| 22 | ······const·asio::ip::address&·listen_address, | 22 | ······const·asio::ip::address&·listen_address, |
| 23 | ······const·asio::ip::address&·multicast_address) | 23 | ······const·asio::ip::address&·multicast_address) |
| 24 | ····:·local_socket(io_context) | 24 | ····:·local_socket(io_context) |
| 25 | ··{ | 25 | ··{ |
| 26 | ····//·Create·the·socket·so·that·multiple·may·be·bound·to·the·same·address. | 26 | ····//·Create·the·socket·so·that·multiple·may·be·bound·to·the·same·address. |
| 27 | ····asio::ip::udp::endpoint·listen_endpoint( | 27 | ····asio::ip::udp::endpoint·listen_endpoint( |
| 28 | ········listen_address,·multicast_port); | 28 | ········listen_address,·multicast_port); |
| 29 | ····local_socket.open(listen_endpoint.protocol()); | 29 | ····local_socket.open(listen_endpoint.protocol()); |
| 30 | ····local_socket.set_option(asio::ip::udp::socket::reuse_address(true)); | 30 | ····local_socket.set_option(asio::ip::udp::socket::reuse_address(true)); |
| 31 | ····local_socket.bind(listen_endpoint); | 31 | ····local_socket.bind(listen_endpoint); |
| 32 | | 32 | |
| 33 | ····//·Join·the·multicast·group. | 33 | ····//·Join·the·multicast·group. |
| 34 | ····local_socket.set_option( | 34 | ····local_socket.set_option( |
| 35 | ········asio::ip::multicast::join_group(multicast_address)); | 35 | ········asio::ip::multicast::join_group(multicast_address)); |
| 36 | | 36 | |
| 37 | ····socket_.async_receive_from( | 37 | ····do_receive(); |
| 38 | ········asio::buffer(data_,·max_length),·sender_endpoint_, | |
| 39 | ········boost::bind(&receiver::handle_receive_from,·this, | |
| 40 | ··········asio::placeholders::error, | |
| 41 | ··········asio::placeholders::bytes_transferred)); | |
| 42 | ··} | 38 | ··} |
| 43 | | 39 | |
| 44 | ··void·handle_receive_from(const·asio::error_code&·error, | 40 | private: |
| 45 | ······size_t·bytes_recvd) | 41 | ··void·do_receive() |
| 46 | ··{ | 42 | ··{ |
| 47 | ····if·(!error) | 43 | ····socket_.async_receive_from( |
| 48 | ····{ | 44 | ········asio::buffer(data_),·sender_endpoint_, |
| 49 | ······std::cout.write(data_,·bytes_recvd); | 45 | ········[this](std::error_code·ec,·std::size_t·length) |
| 50 | ······std::cout·<<·std::endl; | 46 | ········{ |
| | 47 | ··········if·(!ec) |
| | 48 | ··········{ |
| | 49 | ············std::cout.write(data_.data(),·length); |
| | 50 | ············std::cout·<<·std::endl; |
| 51 | | 51 | |
| 52 | ······socket_.async_receive_from( | 52 | ············do_receive(); |
| 53 | ··········asio::buffer(data_,·max_length),·sender_endpoint_, | 53 | ··········} |
| 54 | ··········boost::bind(&receiver::handle_receive_from,·this, | 54 | ········}); |
| 55 | ············asio::placeholders::error, | |
| 56 | ············asio::placeholders::bytes_transferred)); | |
| 57 | ····} | |
| 58 | ··} | 55 | ··} |
| 59 | | 56 | |
| 60 | private: | |
| 61 | ··asio::ip::udp::socket·local_socket; | 57 | ··asio::ip::udp::socket·local_socket; |
| 62 | ··asio::ip::udp::endpoint·sender_endpoint_; | 58 | ··asio::ip::udp::endpoint·sender_endpoint_; |
| 63 | ··enum·{·max_length·=·1024·}; | 59 | ··std::array<char,·1024>·data_; |
| 64 | ··char·data_[max_length]; | |
| 65 | }; | 60 | }; |
| 66 | | 61 | |
| 67 | int·main(int·argc,·char*·argv[]) | 62 | int·main(int·argc,·char*·argv[]) |
| 68 | { | 63 | { |
| 69 | ··try | 64 | ··try |
| 70 | ··{ | 65 | ··{ |
| 71 | ····if·(argc·!=·3) | 66 | ····if·(argc·!=·3) |
| 72 | ····{ | 67 | ····{ |
| 73 | ······std::cerr·<<·"Usage:·receiver·<listen_address>·<multicast_address>\n"; | 68 | ······std::cerr·<<·"Usage:·receiver·<listen_address>·<multicast_address>\n"; |
| 74 | ······std::cerr·<<·"··For·IPv4,·try:\n"; | 69 | ······std::cerr·<<·"··For·IPv4,·try:\n"; |
| 75 | ······std::cerr·<<·"····receiver·0.0.0.0·239.255.0.1\n"; | 70 | ······std::cerr·<<·"····receiver·0.0.0.0·239.255.0.1\n"; |
| 76 | ······std::cerr·<<·"··For·IPv6,·try:\n"; | 71 | ······std::cerr·<<·"··For·IPv6,·try:\n"; |
| 77 | ······std::cerr·<<·"····receiver·0::0·ff31::8000:1234\n"; | 72 | ······std::cerr·<<·"····receiver·0::0·ff31::8000:1234\n"; |
| 78 | ······return·1; | 73 | ······return·1; |
| 79 | ····} | 74 | ····} |
| 80 | | 75 | |
| 81 | ····asio::io_context·io_context; | 76 | ····asio::io_context·io_context; |
| 82 | ····receiver·r(io_context, | 77 | ····receiver·r(io_context, |
| 83 | ········asio::ip::make_address(argv[1]), | 78 | ········asio::ip::make_address(argv[1]), |
| 84 | ········asio::ip::make_address(argv[2])); | 79 | ········asio::ip::make_address(argv[2])); |
| 85 | ····io_context.run(); | 80 | ····io_context.run(); |
| 86 | ··} | 81 | ··} |
| 87 | ··catch·(std::exception&·e) | 82 | ··catch·(std::exception&·e) |
| 88 | ··{ | 83 | ··{ |
| 89 | ····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n"; | 84 | ····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n"; |
| 90 | ··} | 85 | ··} |
| 91 | | 86 | |
| 92 | ··return·0; | 87 | ··return·0; |
| 93 | } | 88 | } |