how to convert EXT(type:1,size=8) data in cpp #1072

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1. redboltz commented on May 25, 2023

   

   redboltz

   on May 25, 2023

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   When msgpack-c(C++) receives EXT format family MessagePack formatted byte stream, msgpack-c creates msgpack::object and its type is msgpack::type::EXT.
   See https://github.com/msgpack/msgpack-c/wiki/v2_0_cpp_object

   You can access msgpack::object directly as follows:
   

   msgpack-c/test/msgpack_basic.cpp

   Line 328 in ac062e2

   BOOST_AUTO_TEST_CASE(simple_buffer_fixext1)

   Or you can use msgpack::type::ext or msgpack::type::ext_ref helper classes as follows:
   

   msgpack-c/test/msgpack_basic.cpp

   Lines 590 to 608 in ac062e2

   	BOOST_AUTO_TEST_CASE(simple_buffer_ext_convert)
   	{
   	std::size_t const size = 65536;
   	msgpack::sbuffer sbuf;
   	msgpack::packer<msgpack::sbuffer> packer(sbuf);
   	char buf[size];
   	for (std::size_t i = 0; i != size; ++i) buf[i] = static_cast<char>(i);
   	packer.pack_ext(sizeof(buf), 77);
   	packer.pack_ext_body(buf, sizeof(buf));
   	msgpack::object_handle oh =
   	msgpack::unpack(sbuf.data(), sbuf.size());
   	msgpack::type::ext e;
   	oh.get().convert(e);
   	BOOST_CHECK_EQUAL(size, e.size());
   	BOOST_CHECK_EQUAL(77, e.type());
   	BOOST_CHECK(
   	std::equal(buf, buf + sizeof(buf), e.data()));
   	}
2. Avalanchecoder commented on May 25, 2023

   

   Avalanchecoder

   on May 25, 2023 via email

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   When i deserilize message, i have map which contains either int/bool/string/EXT(type:1,size8). to convert EXT(type:1,size8) which initially contains int from python. I parse it as follows. void on_incoming_message(const AMQP::Message &message, uint64_t deliveryTag, bool redelivered) //void on_incoming_message() { std::string msg(message.body(), message.bodySize()); msgpack::object_handle oh = msgpack::unpack(msg.data(), msg.size()); // deserialized object is valid during the msgpack::object_handle instance is alive. msgpack::object deserialized = oh.get(); cout << deserialized.type << "------------ type >>>" << endl; std::cout << deserialized << std::endl; // convert msgpack::object instance into the original type. // if the type is mismatched, it throws msgpack::type_error exception. std::unordered_map<std::string,std::string> output; if (deserialized.type == msgpack::type::MAP) { msgpack::object_map& map = deserialized.via.map; output = convertObjectMap(deserialized.via.map); } print_event(output); // or create the new instance //msgpack::type::tuple<int, bool, std::string> dst2 = std::unordered_map<std::string, std::string> convertObjectMap(const msgpack::object_map& objectMap) { std::unordered_map<std::string, std::string> result; for (const auto& pair : objectMap) { std::string key, value; // Convert the key to std::string pair.key.convert(key); // Convert the value to std::string value = convertToString(pair.val); // Store the key-value pair in the result map result[key] = value; } return result; } std::string convertToString(const msgpack::object& obj) { {       if (obj.type == msgpack::type::EXT) { std::string msg(obj.via.ext.data(), obj.via.ext.size); auto abc =msgpack::unpack(msg.data(),msg.size()); uint64_t intValue; abc.get().convert(intValue); value = std::to_string(intValue); } } it is unable to parse value. Im new to msgpack and cpp that could a reason of such simple questions

   …

   ________________________________ From: Takatoshi Kondo ***@***.***> Sent: 25 May 2023 07:39 To: msgpack/msgpack-c ***@***.***> Cc: Avalanchecoder ***@***.***>; Author ***@***.***> Subject: Re: [msgpack/msgpack-c] how to convert EXT(type:1,size=8) data in cpp (Issue #1072) When msgpack-c(C++) receives EXT format family MessagePack formatted byte stream, msgpack-c creates msgpack::object and its type is msgpack::type::EXT. See https://github.com/msgpack/msgpack-c/wiki/v2_0_cpp_object You can access msgpack::object directly as follows: https://github.com/msgpack/msgpack-c/blob/ac062e28cbf80db345800b6e113dea8ab0055499/test/msgpack_basic.cpp#L328 Or you can use msgpack::type::ext or msgpack::type::ext_ref helper classes as follows: https://github.com/msgpack/msgpack-c/blob/ac062e28cbf80db345800b6e113dea8ab0055499/test/msgpack_basic.cpp#L590-L608 — Reply to this email directly, view it on GitHub<#1072 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AKQHHHVFEJLZD6FWYSNCQQLXH25NTANCNFSM6AAAAAAYNNRP4M>. You are receiving this because you authored the thread.Message ID: ***@***.***>
3. redboltz commented on May 25, 2023

   

   redboltz

   on May 25, 2023

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   I recommend that create a simple code (no MAP, no AMQP).
   That is focused on msgpack EXT only like the test code I mentioned.
   And confirm the simple code works well, and then apply your project.