Bonjour,

J’émets un signal depuis une classe, et que je transmet à un composant QML via la fonction
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setContextProperty
(c++) et
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 Connections{}
via mon composant QML.

Cette classe est créée sur l'event d'un bouton. (je vois bien les actions liées a cette classe).
Par contre, pour récupérer le signal émis par la classe , c'est la que ça coince.
QML ne voit pas le signal.
En debug, je vois passer des warnings :
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 QML Connections: Binding loop detected for property "target"
et
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Expression qrc:/Signin.qml:8:17 depends on non-NOTIFYable properties:
Je vous met le code ci-dessous des classes concernées.

Signin.qml
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import QtQuick 2.10
import QtQuick.Controls 2.3
 
Item {
    id: test
 
    Connections{
        target: http
        onLogin: console.log("test")
    }
 
    TextInput {
        id: login
        x: 280
        y: 183
        width: 100
        height: 23
        text: qsTr("Login ")
        font.pixelSize: 12
    }
 
    TextInput {
        id: password
        x: 280
        y: 219
        width: 100
        height: 20
        text: qsTr("Password")
        echoMode: TextInput.Password
        font.pixelSize: 12
    }
 
    Button {
        id: send
        x: 280
        y: 257
        width: 61
        height: 25
        text: qsTr("Connect")
        onClicked:{
            http.start_request("myurl", "443", "/login", 11, "POST", "username=" + login.text + "&password=" + password.text)
        }
    }
}
Main.qml
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import QtQuick 2.7
import QtQuick.Window 2.2
import QtQuick.Controls 2.3
import QtQuick.Layouts 1.3
 
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Doze Chat ")
 
    Index {
        id: chat
        visible: false
    }
 
    SwipeView {
        id: swipeView
        anchors.fill: parent
        currentIndex: tabBar.currentIndex
 
        Signin {
            id: signin
        }
 
        Signup {
            id: signup
        }
}
 
    TabBar {
            id: tabBar
            x: 274
            y: 123
            currentIndex: swipeView.currentIndex
 
            TabButton {
                text: qsTr("Login")
            }
            TabButton {
                text: qsTr("Register")
            }
    }
 
}
request.h
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#ifndef REQUEST_H
#define REQUEST_H
 
#include <QString>
#include "hash_password.h"
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl/error.hpp>
#include <boost/asio/ssl/stream.hpp>
#include <QObject>
 
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
 
using tcp = boost::asio::ip::tcp;
namespace ssl = boost::asio::ssl;
namespace http = boost::beast::http;
namespace pt = boost::property_tree;
 
class request : public QObject, public std::enable_shared_from_this<request>
{
    Q_OBJECT
 
signals:
    void login();
 
public:
    explicit request(boost::asio::io_context& ioc, boost::asio::ssl::context& ctx);
    void run(char const* host, char const* port, char const* target, int version, QString method, QString body = NULL);
    Q_INVOKABLE void start_request( QString host, QString port, QString target, int version, QString method, QString body = NULL);
    std::string respond;
    QString GetmessageError;
 
private:
    hash_password hashed_password;
    tcp::resolver resolver;
    boost::asio::ssl::stream<tcp::socket> stream;
    boost::beast::flat_buffer buffer;
    boost::beast::http::request<http::string_body> req;
    boost::beast::http::response<http::string_body> res;
 
    void on_resolve(boost::system::error_code ec, boost::asio::ip::tcp::resolver::results_type results);
    void on_connect(boost::system::error_code ec);
    void on_handshake(boost::system::error_code ec);
    void on_write(boost::system::error_code ec, std::size_t bytes_transferred);
    void on_read(boost::system::error_code ec, std::size_t bytes_transferred);
    void on_shutdown(boost::system::error_code ec);
    void fail(boost::system::error_code ec, char const* what);
 
    //json_parser Jsonresponse;
    std::string GetApiResponse(std::stringstream Jsonres, pt::ptree root);
 
};
 
#endif // REQUEST_H

request.cpp
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#include "request.h"
#include <iostream>
#include <boost/beast/http/verb.hpp>
#include <boost/utility/string_view.hpp>
 
//#include <boost/property_tree/ptree.hpp>
//#include <boost/property_tree/json_parser.hpp>
 
request::request(boost::asio::io_context& ioc, ssl::context& ctx) : resolver(ioc) , stream(ioc, ctx)
{
 
}
 
void request::fail(boost::system::error_code ec, char const* what)
{
    std::cerr << what << ": " << ec.message() << "\n";
}
 
void request::run(char const* host, char const* port, char const* target, int version, QString method, QString body)
{
    // Set SNI Hostname (many hosts need this to handshake successfully)
    if(! SSL_set_tlsext_host_name(stream.native_handle(), host))
    {
        boost::system::error_code ec{static_cast<int>(::ERR_get_error()), boost::asio::error::get_ssl_category()};
        std::cerr << ec.message() << "\n";
        respond = "test" ;
        return;
    }
 
    // Set up an HTTP GET request message
    http::verb method_verb;
    boost::string_view method_strview ;
    method_strview = method.toStdString();
    method_verb = boost::beast::http::string_to_verb(method_strview);
    req.version(version);
    req.method(method_verb);
    req.target(target);
    req.set(http::field::host, host);
    req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
    req.set(http::field::content_type, "application/x-www-form-urlencoded");
    req.body() = body.toStdString() ;
    req.prepare_payload();
 
    // Look up the domain name
    resolver.async_resolve(host, port, std::bind(&request::on_resolve, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
 }
 
void request::on_resolve(boost::system::error_code ec, tcp::resolver::results_type results)
{
    if(ec){
        //return fail(ec, "resolve");
        respond = "test" ;
    }
    // Make the connection on the IP address we get from a lookup
    boost::asio::async_connect(stream.next_layer(), results.begin(), results.end(), std::bind( &request::on_connect, shared_from_this(), std::placeholders::_1));
}
 
void request::on_connect(boost::system::error_code ec)
{
    if(ec){
        //return fail(ec, "connect");
         respond = ec.message();
        }
 
    // Perform the SSL handshake
    stream.async_handshake(ssl::stream_base::client, std::bind(&request::on_handshake, shared_from_this(), std::placeholders::_1));
}
 
void request::on_handshake(boost::system::error_code ec)
{
    if(ec){
        return fail(ec, "handshake");
    }
 
    // Send the HTTP request to the remote host
    http::async_write(stream, req, std::bind(&request::on_write, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
}
 
void request::on_write(boost::system::error_code ec, std::size_t bytes_transferred)
{
    boost::ignore_unused(bytes_transferred);
 
    if(ec)
        return fail(ec, "write");
 
    // Receive the HTTP response
    http::async_read(stream, buffer, res, std::bind(&request::on_read, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
}
 
void request::on_read(boost::system::error_code ec, std::size_t bytes_transferred)
{
    boost::ignore_unused(bytes_transferred);
 
    if(ec)
        return fail(ec, "read");
 
    switch(res.result_int())
    {
    case 200: {
        emit login(); //Le signal est la !
        std::cout<<res.result_int()<<std::endl;
              }
        break;
 
    }
 
    // Gracefully close the stream
    stream.async_shutdown(std::bind(&request::on_shutdown, shared_from_this(), std::placeholders::_1));
}
 
void request::on_shutdown(boost::system::error_code ec)
{
    if(ec == boost::asio::error::eof)
    {
        ec.assign(0, ec.category());
    }
    if(ec)
      return fail(ec, "shutdown");
 
    // If we get here then the connection is closed gracefully
}
 
void request::start_request(QString host, QString port, QString target, int version, QString method, QString body)
{
    boost::asio::io_context ioc;
    ssl::context ctx{ssl::context::sslv23_client};
 
    const char* std_host = host.toStdString().c_str();
    const char* std_port = port.toStdString().c_str();
    const char* std_target = target.toStdString().c_str();
    const char* std_method = method.toStdString().c_str();
    const char* std_body = body.toStdString().c_str();
 
    std::make_shared<request>(ioc, ctx)->run(std_host, std_port, std_target, version, std_method, std_body );
    ioc.run();
}
 
std::string request::GetApiResponse(std::stringstream Jsonres, pt::ptree root)
{
    pt::read_json(Jsonres, root);
    std::cout<<root.get<std::string>("user.permission")<<std::endl;
    return root.get<std::string>("user.permission");
}

main.cpp
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#include <QGuiApplication>
#include <QQmlApplicationEngine>
 
#include <iostream>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
 
#include "tcp_client.h"
#include "message.h"
#include "observer.h"
#include "request.h"
 
#include <QDebug>
#include <QObject>
#include <QQuickItem>
#include <QQmlContext>
 
struct testmessage : public observer
{
    virtual void update(message data)
    {
        switch (data.m_type)
        {
        case  message::NEW_MSG:
        {
            std::string chaine = "[" + data.m_login + "]: ";
            chaine += data.m_message;
            std::cout <<"test"<< chaine << std::endl;
        }
            break;
        case message::PERSON_CONNECTED:  std::cout << "Nouvelle personne!" << std::endl;
            break;
        case message::PERSON_LEAVED: std::cout << "Une personne nous quitte" << std::endl;
            break;
            //default:
        }
    }
};
 
boost::asio::io_service io_service;
 
int main(int argc, char *argv[])
{
    //test connexion
 
    QGuiApplication app(argc, argv);
 
    QQmlApplicationEngine engine;
 
    boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::address::from_string("192.168.226.132"), 4000);
    std::string login = "allo";
 
    boost::asio::io_context ioc;
    boost::asio::ssl::context ctx{ssl::context::sslv23_client};
    tcp_client c(io_service, endpoint, login);
    request request(ioc, ctx);
 
 
    engine.rootContext()->setContextProperty("tcp_client", &c);
    engine.rootContext()->setContextProperty("http", &request);
 
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 
    return app.exec();
}

En sachant que j'ai crée une simple application QML, avec un bouton qui appelle une classe c++. cette classe émet un signal. Ce signal est bien reçu par QML.
La je comprends plus rien.
PS : Je vois bien le std::cout du switch concerné qui m'affiche "200"