如何使用 cpprestsdk 从websocket_client解析 json 数据

How to parse json data from websocket_client using cpprestsdk

本文关键字：client 解析 json 数据 websocket 何使用 cpprestsdk 更新时间：2023-10-16

我正在连接到一个总是用JSON回复的WebSocket。我看到有一种extract_string方法可用于websocket_incoming_message但是在使用 json：value 尝试了许多事情之后，似乎您只能通过逐个插入键值对来动态构建 JSON 数组。我在这里错过了什么，还是有没有办法从websocket_incoming_message获取输出并将其直接转换为 json：value 数组？

websocket_client client;
//start socket connection to server
try {
std::cout << "s

----------

client.connect(U("wss://XZXXXZZy.com/ws?account_id=4de3f308f2f8d3247As70228f94e0d2aAea&ws_key=reception")).wait();
}
catch (const std::exception&e)
{
std::cout << e.what() << std::endl;
}
//send messages to the server
//websocket_outgoing_message msg;
//msg.set_pong_message();
//std::cout << "n...........2nd.........;";
//std::string data = "hii";
//client.send(msg).then([]() { 
//  
//  
//  
//  
//  /* Successfully sent the message. */ });
//std::cout << " Successfully sent the message.";
//std::cout << "n...........3rd.........;";

//receive messages from the server

client.receive().then([](websocket_incoming_message msg) {
std::cout << "receiving data from socket";

return msg.extract_string();

}).then([](std::string body) {
//FETCHING THE DATA FROM BODY. "TEXT/JSON"
std::cout << "displaying the data";
std::cout << body << std::endl;
const json::value& v1 = body.substr;


utility::string_t jsonval = v1.serialize();
auto array = v1.at(U("rows")).as_array();

for (int i = 0; i<array.size(); ++i)
{
auto id = array[i].at(U("id")).as_string();
std::wcout << "n" << id;
auto key = array[i].at(U("key")).as_string();
std::wcout << "n" << key;
auto array2 = array[i].at(U("value")).as_array();
std::wcout << array2[0];
std::wcout << array2[1];
}
}

);
//close the connection
client.close().then([]() {

std::cout << "successfully close socket connction";

/* Successfully closed the connection. */
});

I have json response in my string body.but i dont know how to parse json data from websocket responses event. i want to display contacts from api responses.please help me.. 

MY JSON RESPONSES
--------------------------------------

.{"action":"refresh_dashboard","data":{"users_list":[{"user_id":"901e6076ff351cfc2195fb86f8438a26","extensions":["1002"],"name":"Karthik M"},{"user_id":"cc3f94ecc14ee9c55670dcde9adc1887","extensions":["1006"],"name":"Rounak S Kiran"},{"user_id":"6c29ebdb34e1761fdf9423c573087979","extensions":["1003"],"name":"Amar Nath"},{"user_id":"74d5b5a9aca1faa4c2f217ce87b621d8","extensions":["1008"],"name":"Robin Raju"},{"user_id":"a7ad7e73bf93ea83c8efdc1723cba198","extensions":["1007"],"name":"Arshad Arif"},{"user_id":"b55146df593ec8d09e5fe12a8a4c1108","extensions":["1001"],"name":"Rahib Rasheed"},{"user_id":"3258f7ae4ae1db60435cbcf583f64a89","extensions":["1009"],"name":"Test User"},{"user_id":"90bc84e5e8a3427fe35e99bd4386de95","extensions":["1010"],"name":"Prince T"},{"user_id":"b501ef5b270a196afc0eed557ca74237","extensions":["1005","+17325951060"],"name":"Jineed AJ"},{"user_id":"1422af351e06adeab2de92f5a633a444","extensions":["1004"],"name":"Ashok PA"}],"busy_users":[],"reg_users":[{"user_id":"cc3f94ecc14ee9c55670dcde9adc1887","status":"registered"},{"user_id":"901e6076ff351cfc2195fb86f8438a26","status":"registered"},{"user_id":"1422af351e06adeab2de92f5a633a444","status":"registered"},{"user_id":"3258f7ae4ae1db60435cbcf583f64a89","status":"registered"},{"user_id":"b55146df593ec8d09e5fe12a8a4c1108","status":"registered"},{"user_id":"6c29ebdb34e1761fdf9423c573087979","status":"registered"}],"contacts":[{"owner_id":"cc3f94ecc14ee9c55670dcde9adc1887","status":"ready"},{"owner_id":"901e6076ff351cfc2195fb86f8438a26","status":"ready"},{"owner_id":"1422af351e06adeab2de92f5a633a444","status":"ready"},{"owner_id":"3258f7ae4ae1db60435cbcf583f64a89","status":"ready"},{"owner_id":"b55146df593ec8d09e5fe12a8a4c1108","status":"ready"},{"owner_id":"6c29ebdb34e1761fdf9423c573087979","status":"ready"}]}}

我得到了完整的解决方案，请尝试使用来自nuget的boost pacakges。该文档将帮助您从字符串中解析 json 数据。我认为 jsoncpp 不是 nuget.so 中可用的更新包，请尝试 nuget 中可用的提升包。

迈森字符串

{"action"："refresh_dashboard"，"data"：{"users_list"：[{"user_id"："901e6076ff351cfc2195fb86f8438a26"，"extensions"： ["1002"]，"name"："Karthik M"}，{"user_id"："7d617ef5b2390d081d901b0d5cd108eb"，"extensions"：["1015"]，"name"："Synway User2"}，{"user_id"："c8f667f7d663e81f6e7fa34b9296f067"，"extensions"：["1012"]，"name"："Rahib Video"}，{"user_id"："cc3f94ecc14ee9c55670dcde9adc1887"，"extensions"：["1006"]，"name"："Rounak S Kiran"}，{"user_id"："6c29ebdb34e1761fdf9423c573087979"，"extensions"：["1003"]，"name"："Amar Nath"}，{"user_id"："8e15c2d95d4325cb07f0750846966be8"，"extensions"： ["1011"]，"name"："TLS User"}，{"user_id"："2fc4142bdacf83c1957bda0ad9d50e3d"，"extensions"：["1014"]，"name"："Synway User1"}，{"user_id"："74d5b5a9aca1faa4c2f217ce87b621d8"，"extensions"：["1008"]，"name"："Robin Raju"}，{"user_id"："a7ad7e73bf93ea83c8efdc1723cba198"，"extensions"：["1007"]，"name"："Arshad Arif"}，{"user_id"："b55146df593ec8d09e5fe12a8a4c1108"，"extensions"：["1001"]，"name"："Rahib Rasheed"}，{"user_id"："391391de005a8f5403c7b5591f462ea1"，"extensions"： ["1013"]，"name"："Sangeeth J"}，{"user_id"："3258f7ae4ae1db60435cbcf583f64a89"，"extensions"：["1009"]，"name"："Aby TL"}，{"user_id"："90bc84e5e8a3427fe35e99bd4386de95"，"extensions"：["1010"]，"name"："Prince T"}，{"user_id"："b501ef5b270a196afc0eed557ca74237"，"extensions"：["1005"]，"name"："Jineed AJ"}，{"user_id"："1422af351e06adeab2de92f5a633a444"，"extensions"： ["1004

"]，"name"："Ashok PA"}]，"busy_users"：[]，"reg_users"：[{"user_id"："901e6076ff351cfc2195fb86f8438a26"，"status"："register"}，{"user_id"："6c29ebdb34e1761fdf9423c573087979"，"status"："register"}]，"contacts"：[{"owner_id"："901e6076ff351cfc2195fb86f8438a26"，"status"："ready"}，{"owner_id"："6c29ebdb34e1761fdf9423c573087979"，"status"："ready"}]}}

代码

client.receive().then([](websocket_incoming_message msg) {
std::cout << "receiving data from socket";
// msg.message_type();
return msg.extract_string();
//1..i have one string
//cout<<"n///////////test"<< msg.extract_string().get().c_str();
//  // 2.convert to json array
//json::value::parse(   ::to_string_t(msg.extract_string().get()))
//
}).then([](std::string body) {
//std::cout << "displaying the data";
std::cout << body << std::endl;

std::string ss = body;
ptree pt;
std::istringstream is(ss);
read_json(is, pt);
std::cout <<"n 1st"<< "action:     " << pt.get<std::string>("action") << "n";
std::cout <<"n 2nd"<< "data: " << pt.get<std::string>("data") << "n";
std::cout << "--------------------------------------------------------------";
for (auto& e : pt.get_child("data.users_list")) {
std::cout << "n" << "users id " << e.second.get<std::string>("user_id") << "n";

}
});

有用的资源

使用 Boost ptree 将 JSON 数组解析为 std：：string
C++提升解析动态生成的 JSON 字符串(不是文件)