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

[Avalanchecoder]

{"signal_id":2801684810234,"type":"SIGNAL","signaltype":"NEW_ENTRY","exit_time":datetime.time(15,55),"remarks":26}
elif isinstance(obj, datetime.time):
# always encode in the 8-byte form
data = datetime.datetime.combine(
datetime.datetime.today(), obj)
data = int((obj.hour * 60 * 60 + obj.minute * 60 + obj.second) * 1e6
+ obj.microsecond)

    return KanhojiExtType(1, data.to_bytes(8, byteorder='big'))

this is my encoding logic
I am sending this from python. datetime format which in convert in "int" with type code 1

when i deserialise msgpack in cpp
{"signal_id":2801684810234,"type":"SIGNAL","signaltype":"NEW_ENTRY","exit_time":"EXT(type:1,size:8)","remarks":26}

could you help me to deserialising this field "exit_time":"EXT(type:1,size:8)" ?

[redboltz]

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()));
	}

[Avalanchecoder]

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: ***@***.***>

[redboltz]

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.