### Installation Rules

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatserver-cpp/CMakeLists.txt

Configures installation rules for the 'chatserver' target, specifying destinations for the executable, libraries, and bundle.

```cmake
install(TARGETS chatserver
    BUNDLE DESTINATION .
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
)
```

--------------------------------

### QWebChannel Class - Basic Setup and Object Registration

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Demonstrates the basic setup of QWebChannel with a WebSocket server and registers a custom QObject for remote access.

```APIDOC
## C++ API - QWebChannel Class

### Description
This example shows how to set up a `QWebChannel` with a `QWebSocketServer` and register a custom `QObject` (MyService) to be accessible by remote clients. The `MyService` class exposes a property `status` and methods `processData` and `sendNotification`.

### Method
N/A (This is a C++ code example demonstrating setup)

### Endpoint
N/A (This is a C++ code example demonstrating setup)

### Request Body
N/A

### Request Example
```cpp
#include <QWebChannel>
#include <QWebSocketServer>
#include <QWebSocket>

// Define a QObject to publish
class MyService : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString status READ status WRITE setStatus NOTIFY statusChanged)

public:
    explicit MyService(QObject *parent = nullptr) : QObject(parent), m_status("ready") {}

    QString status() const { return m_status; }
    void setStatus(const QString &status)
    {
        if (m_status != status) {
            m_status = status;
            emit statusChanged(m_status);
        }
    }

signals:
    void statusChanged(const QString &status);
    void messageReceived(const QString &message);

public slots:
    QString processData(const QString &input) {
        emit messageReceived(input);
        return input.toUpper();
    }

    void sendNotification(const QString &text) {
        emit messageReceived(text);
    }

private:
    QString m_status;
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    // Setup WebSocket server
    QWebSocketServer server("MyServer", QWebSocketServer::NonSecureMode);
    server.listen(QHostAddress::LocalHost, 12345);

    // Setup WebChannel
    QWebChannel channel;

    // Create and register service object
    MyService service;
    channel.registerObject(QStringLiteral("myService"), &service);

    // Connect new WebSocket clients to the channel
    QObject::connect(&server, &QWebSocketServer::newConnection, [&]() {
        QWebSocket *socket = server.nextPendingConnection();
        WebSocketTransport *transport = new WebSocketTransport(socket);
        channel.connectTo(transport);
    });

    return app.exec();
}
```

### Response
N/A (This is a C++ code example demonstrating setup)
```

--------------------------------

### Setup WebChannel in QML

Source: https://github.com/qtproject/qtwebchannel/blob/dev/README.md

Configure the WebChannel in QML, registering objects and connecting transports.

```qml
WebChannel {
    registeredObjects: [foo, bar, ...]

    transports: [yourTransport]
}
```

--------------------------------

### Configure QtWebChannel Examples

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/CMakeLists.txt

Defines the build targets for QtWebChannel examples, including conditional checks for required modules like Qt::WebSockets and Qt::Widgets.

```cmake
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

qt_internal_add_example(shared)

qt_internal_add_example(nodejs)
qt_internal_add_example(qwclient)
qt_internal_add_example(chatclient-html)

if(TARGET Qt::WebSockets AND NOT ANDROID)
    qt_internal_add_example(chatserver-cpp)
endif()
if(TARGET Qt::WebSockets AND TARGET Qt::Widgets)
    qt_internal_add_example(standalone)
    qt_internal_add_example(chatclient-qml)
endif()
```

--------------------------------

### JavaScript WebSocket and QWebChannel Setup

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/standalone/index.html

This script sets up a WebSocket connection and integrates with QWebChannel to enable communication. It handles connection, error, and message events, making the 'core' object globally accessible for interacting with the Qt backend. Use this for establishing the initial connection and setting up message handlers.

```javascript
//BEGIN SETUP
function output(message) {
    var output = document.getElementById("output");
    output.innerHTML = output.innerHTML + message + "\n";
}

window.onload = function() {
    if (location.search != "")
        var baseUrl = (/\(?&?\]?webChannelBaseUrl=(\[A-Za-z0-9\-:/\.=\]+)/.exec(location.search)[1]);
    else
        var baseUrl = "ws://localhost:12345";

    output("Connecting to WebSocket server at " + baseUrl + ".");
    var socket = new WebSocket(baseUrl);

    socket.onclose = function() {
        console.error("web channel closed");
    };

    socket.onerror = function(error) {
        console.error("web channel error: " + error);
    };

    socket.onopen = function() {
        output("WebSocket connected, setting up QWebChannel.");
        new QWebChannel(socket, function(channel) {
            // make core object accessible globally
            window.core = channel.objects.core;

            document.getElementById("send").onclick = function() {
                var input = document.getElementById("input");
                var text = input.value;
                if (!text) {
                    return;
                }
                output("Sent message: " + text);
                input.value = "";
                core.receiveText(text);
            }

            core.sendText.connect(function(message) {
                output("Received message: " + message);
            });

            core.receiveText("Client connected, ready to send/receive messages!");
            output("Connected to WebChannel, ready to send/receive messages!");
        });
    }
}
//END SETUP
```

--------------------------------

### Copying qwebchannel.js

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/standalone/CMakeLists.txt

Defines a custom command to copy the qwebchannel.js file from the Qt installation to the build directory. This file is essential for the WebChannel client-side functionality.

```cmake
add_custom_command(
    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/qwebchannel.js
    COMMAND ${CMAKE_COMMAND} -E copy
            ${QT_QWEBCHANNEL_JS_PATH}
            ${CMAKE_CURRENT_BINARY_DIR}/qwebchannel.js
    DEPENDS ${QT_QWEBCHANNEL_JS_PATH}
    VERBATIM
)
```

--------------------------------

### Build Qt WebChannel Module

Source: https://github.com/qtproject/qtwebchannel/blob/dev/README.md

Standard build process for the Qt WebChannel module using QMake.

```bash
qmake-qt5
make
make install
```

--------------------------------

### Initialize WebSocket and QWebChannel

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatclient-html/chatclient.html

Sets up the WebSocket connection and initializes QWebChannel. Connects to signals for user list changes and new messages, and a keep-alive signal.

```javascript
'use strict'; var wsUri = "ws://localhost:12345"; window.loggedin = false; window.onload = function() { var socket = new WebSocket(wsUri); socket.onclose = function() { console.error("web channel closed"); }; socket.onerror = function(error) { console.error("web channel error: " + error); }; socket.onopen = function() { window.channel = new QWebChannel(socket, function(channel) { //connect to the changed signal of a property channel.objects.chatserver.userListChanged.connect(function() { $('#userlist').empty(); //access the property channel.objects.chatserver.userList.forEach(function(user) { $('#userlist').append(user + '<br>'); }); }); //connect to a signal channel.objects.chatserver.newMessage.connect(function(time, user, message) { $('#chat').append("[" + time + "] " + user + ": " + message + '<br>"); }); //connect to a signal channel.objects.chatserver.keepAlive.connect(function(args) { if (window.loggedin) { //call a method channel.objects.chatserver.keepAliveResponse($('#loginname').val()) console.log("sent alive"); } }); }); } }
```

--------------------------------

### Custom Transport Implementation (WebSocketTransport)

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Abstract base class for implementing custom transport layers between C++ and JavaScript clients. This example shows a WebSocket-based transport.

```APIDOC
## QWebChannelAbstractTransport Class

### Description
Abstract base class for implementing custom transport layers between C++ and JavaScript clients.

### Method
`sendMessage(const QJsonObject &message)` (override)

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **message** (QJsonObject) - The JSON message to send to the client.

### Request Example
```cpp
// Example usage within WebSocketTransport::sendMessage
QJsonDocument doc(message);
m_socket->sendTextMessage(QString::fromUtf8(doc.toJson(QJsonDocument::Compact)));
```

### Response
#### Success Response (200)
None (This is an abstract base class)

#### Response Example
None

## WebSocketTransport Class

### Description
WebSocket-based transport implementation for QWebChannel.

### Constructor
`WebSocketTransport(QWebSocket *socket)`

### Methods
- `sendMessage(const QJsonObject &message)`: Sends a JSON message to the client.
- `textMessageReceived(const QString &messageData)`: Slot to handle incoming text messages from the WebSocket.

### Signals
- `messageReceived(const QJsonObject &message, QWebChannelAbstractTransport *transport)`: Emitted when a message is received from the client.

### Request Example
```cpp
// Sending a message
webSocketTransportInstance.sendMessage(someJsonObject);

// Receiving a message (handled by the slot)
// QJsonParseError error;
// QJsonDocument message = QJsonDocument::fromJson(messageData.toUtf8(), &error);
// emit messageReceived(message.object(), this);
```

### Response Example
None (This class handles message sending and receiving)
```

--------------------------------

### Register QObjects with QWebChannel

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Demonstrates registering single and multiple QObjects with QWebChannel. Also shows how to retrieve and deregister objects.

```cpp
#include <QWebChannel>

// Single object registration
QWebChannel channel;
MyService *service = new MyService(&channel);
channel.registerObject(QStringLiteral("service"), service);

// Bulk registration using QHash
QHash<QString, QObject*> objects;
objects.insert("calculator", new Calculator(&channel));
objects.insert("storage", new StorageManager(&channel));
objects.insert("auth", new AuthService(&channel));
channel.registerObjects(objects);

// Get all registered objects
QHash<QString, QObject*> registered = channel.registeredObjects();
for (auto it = registered.begin(); it != registered.end(); ++it) {
    qDebug() << "Registered:" << it.key() << "->" << it.value()->metaObject()->className();
}

// Deregister an object (clients receive destroyed signal)
channel.deregisterObject(service);
```

--------------------------------

### Publish QObjects in C++

Source: https://github.com/qtproject/qtwebchannel/blob/dev/README.md

Construct a QWebChannel and register QObjects for interaction.

```cpp
QWebChannel channel;
channel.registerObject(QStringLiteral("foo"), myFooObj);
....
```

--------------------------------

### Implement a C++ Qt WebChannel Server

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Creates a WebSocket-based server that exposes a QObject-derived service via QWebChannel. Requires a custom QWebChannelAbstractTransport implementation to bridge the WebSocket connection.

```cpp
// main.cpp - Complete standalone server example
#include <QApplication>
#include <QWebChannel>
#include <QWebSocketServer>
#include <QWebSocket>
#include <QJsonDocument>
#include <QJsonObject>

// Transport implementation
class WebSocketTransport : public QWebChannelAbstractTransport
{
    Q_OBJECT
public:
    WebSocketTransport(QWebSocket *socket)
        : QWebChannelAbstractTransport(socket), m_socket(socket)
    {
        connect(socket, &QWebSocket::textMessageReceived,
                this, &WebSocketTransport::onTextMessage);
        connect(socket, &QWebSocket::disconnected,
                this, &QWebSocketTransport::deleteLater);
    }

    void sendMessage(const QJsonObject &message) override {
        m_socket->sendTextMessage(
            QString::fromUtf8(QJsonDocument(message).toJson(QJsonDocument::Compact)));
    }

private slots:
    void onTextMessage(const QString &message) {
        QJsonDocument doc = QJsonDocument::fromJson(message.toUtf8());
        if (doc.isObject())
            emit messageReceived(doc.object(), this);
    }

private:
    QWebSocket *m_socket;
};

// Service to expose
class ChatService : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QStringList users READ users NOTIFY usersChanged)

public:
    QStringList users() const { return m_users.toList(); }

public slots:
    bool login(const QString &username) {
        if (m_users.contains(username)) return false;
        m_users.insert(username);
        emit usersChanged();
        emit userJoined(username);
        return true;
    }

    void sendMessage(const QString &from, const QString &message) {
        emit newMessage(QDateTime::currentDateTime().toString(Qt::ISODate), from, message);
    }

    void logout(const QString &username) {
        m_users.remove(username);
        emit usersChanged();
        emit userLeft(username);
    }

signals:
    void usersChanged();
    void userJoined(const QString &username);
    void userLeft(const QString &username);
    void newMessage(const QString &time, const QString &user, const QString &message);

private:
    QSet<QString> m_users;
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWebSocketServer server("ChatServer", QWebSocketServer::NonSecureMode);
    if (!server.listen(QHostAddress::LocalHost, 12345)) {
        qFatal("Failed to start server");
        return 1;
    }

    QWebChannel channel;
    ChatService chatService;
    channel.registerObject("chatService", &chatService);

    QObject::connect(&server, &QWebSocketServer::newConnection, [&]() {
        channel.connectTo(new WebSocketTransport(server.nextPendingConnection()));
    });

    qDebug() << "Server running on ws://localhost:12345";
    return app.exec();
}

#include "main.moc"
```

--------------------------------

### QState Class Documentation

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.12.0.linux-gcc-amd64.txt

Details about the QState class, including its size, alignment, base class information, and virtual function table.

```APIDOC
## QState Class

### Description
Provides information about the QState class, its memory layout, and its virtual function table.

### Class Details
- **Size**: 16 bytes
- **Alignment**: 8 bytes
- **Base Class**: QAbstractState, QObject

### Virtual Function Table (Vtable) for QState

#### `_ZTV6QState`
- **Entries**: 16
- **Function Pointers**:
  - `0`: (int (*)(...))0
  - `8`: (int (*)(...))(& _ZTI6QState)
  - `16`: (int (*)(...))QState::metaObject
  - `24`: (int (*)(...))QState::qt_metacast
  - `32`: (int (*)(...))QState::qt_metacall
  - `40`: (int (*)(...))QState::~QState
  - `48`: (int (*)(...))QState::~QState
  - `56`: (int (*)(...))QState::event
  - `64`: (int (*)(...))QObject::eventFilter
  - `72`: (int (*)(...))QObject::timerEvent
  - `80`: (int (*)(...))QObject::childEvent
  - `88`: (int (*)(...))QObject::customEvent
  - `96`: (int (*)(...))QObject::connectNotify
  - `104`: (int (*)(...))QObject::disconnectNotify
  - `112`: (int (*)(...))QState::onEntry
  - `120`: (int (*)(...))QState::onExit
```

--------------------------------

### Expose QObjects with QWebChannel

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Sets up a WebSocket server and QWebChannel to expose a custom QObject (MyService) to remote clients. Connects new WebSocket connections to the channel for communication.

```cpp
#include <QWebChannel>
#include <QWebSocketServer>
#include <QWebSocket>

// Define a QObject to publish
class MyService : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString status READ status WRITE setStatus NOTIFY statusChanged)

public:
    explicit MyService(QObject *parent = nullptr) : QObject(parent), m_status("ready") {}

    QString status() const { return m_status; }
    void setStatus(const QString &status)
    {
        if (m_status != status) {
            m_status = status;
            emit statusChanged(m_status);
        }
    }

signals:
    void statusChanged(const QString &status);
    void messageReceived(const QString &message);

public slots:
    QString processData(const QString &input) {
        emit messageReceived(input);
        return input.toUpper();
    }

    void sendNotification(const QString &text) {
        emit messageReceived(text);
    }

private:
    QString m_status;
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    // Setup WebSocket server
    QWebSocketServer server("MyServer", QWebSocketServer::NonSecureMode);
    server.listen(QHostAddress::LocalHost, 12345);

    // Setup WebChannel
    QWebChannel channel;

    // Create and register service object
    MyService service;
    channel.registerObject(QStringLiteral("myService"), &service);

    // Connect new WebSocket clients to the channel
    QObject::connect(&server, &QWebSocketServer::newConnection, [&]() {
        QWebSocket *socket = server.nextPendingConnection();
        WebSocketTransport *transport = new WebSocketTransport(socket);
        channel.connectTo(transport);
    });

    return app.exec();
}
```

--------------------------------

### QStorageInfo Class Documentation

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.12.0.linux-gcc-amd64.txt

Details about the QStorageInfo class, including its size and alignment.

```APIDOC
## QStorageInfo Class

### Description
Provides information about the QStorageInfo class, including its memory layout.

### Class Details
- **Size**: 8 bytes
- **Alignment**: 8 bytes
```

--------------------------------

### Implement a Node.js Qt WebChannel Client

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Connects to a Qt WebChannel server using faye-websocket. Requires the qwebchannel.js library to be available in the project directory.

```javascript
'use strict';

var QWebChannel = require('./qwebchannel.js').QWebChannel;
var WebSocket = require('faye-websocket');

var address = 'ws://127.0.0.1:12345';
var socket = new WebSocket.Client(address);

console.log('Connecting to ' + address);

socket.on('open', function(event) {
    console.log('Connected');

    // Create transport wrapper for faye-websocket
    var transport = {
        send: function(data) {
            socket.send(data);
        },
        onmessage: null
    };

    // Initialize QWebChannel
    new QWebChannel(transport, function(channel) {
        console.log('WebChannel ready');

        var service = channel.objects.service;

        // Subscribe to signals
        service.dataReceived.connect(function(data) {
            console.log('Received:', data);
        });

        // Call methods
        service.processRequest({ action: 'getData' }, function(response) {
            console.log('Response:', response);
        });
    });

    // Connect WebSocket messages to transport
    socket.on('message', function(event) {
        if (transport.onmessage) {
            transport.onmessage(event);
        }
    });
});

socket.on('error', function(error) {
    console.error('Connection error:', error.message);
    process.exit(1);
});

socket.on('close', function() {
    console.log('Connection closed');
    process.exit(0);
});
```

--------------------------------

### Handle Overloaded Methods and Signals in JavaScript

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Use full QMetaMethod signatures to explicitly resolve overloaded methods or connect to specific signal overloads.

```javascript
new QWebChannel(socket, function(channel) {
    var processor = channel.objects.processor;

    // Default overload resolution (best match for JavaScript types)
    processor.process(42);           // Calls process(double)
    processor.process("hello");      // Calls process(QString)
    processor.process("hello", 42);  // Calls process(QString, int)

    // Explicit overload selection using signature
    processor["process(int)"](42);                    // Explicitly call int overload
    processor["process(QString)"]("hello");           // Explicitly call QString overload
    processor["process(QString,int)"]("hello", 42);   // Explicitly call QString,int overload

    // Connecting to overloaded signals
    // Default: connects to first overload
    processor.dataReady.connect(function(data) {
        console.log("Data (default):", data);
    });

    // Explicit signal overload connection
    processor["dataReady(int)"].connect(function(intValue) {
        console.log("Integer data:", intValue);
    });

    processor["dataReady(QString)"].connect(function(stringValue) {
        console.log("String data:", stringValue);
    });

    processor["dataReady(QJsonObject)"].connect(function(jsonObj) {
        console.log("JSON data:", jsonObj);
    });
});
```

--------------------------------

### HTML/JavaScript Chat Client

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

This HTML and JavaScript code sets up a client for a chat application using Qt WebChannel. It connects to a WebSocket server, registers with QWebChannel, and handles user login, message sending, and real-time updates for connected users. Ensure qwebchannel.js is available and the WebSocket server is running on ws://localhost:12345.

```html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Chat Client</title>
    <script src="qwebchannel.js"></script>
    <script>
        var chatService;
        var username;

        window.onload = function() {
            var socket = new WebSocket("ws://localhost:12345");

            socket.onopen = function() {
                log("Connected to server");

                new QWebChannel(socket, function(channel) {
                    chatService = channel.objects.chatService;

                    // Connect to signals
                    chatService.newMessage.connect(function(time, user, message) {
                        log("[" + time + "] " + user + ": " + message);
                    });

                    chatService.userJoined.connect(function(user) {
                        log("*** " + user + " joined ***");
                        updateUserList();
                    });

                    chatService.userLeft.connect(function(user) {
                        log("*** " + user + " left ***");
                        updateUserList();
                    });

                    chatService.usersChanged.connect(updateUserList);

                    document.getElementById("loginForm").style.display = "block";
                });
            };

            socket.onclose = function() {
                log("Disconnected from server");
            };
        };

        function login() {
            username = document.getElementById("username").value.trim();
            if (!username) return;

            chatService.login(username, function(success) {
                if (success) {
                    document.getElementById("loginForm").style.display = "none";
                    document.getElementById("chatForm").style.display = "block";
                    log("Logged in as " + username);
                } else {
                    alert("Username already taken");
                }
            });
        }

        function sendMessage() {
            var input = document.getElementById("message");
            var message = input.value.trim();
            if (message) {
                chatService.sendMessage(username, message);
                input.value = "";
            }
        }

        function updateUserList() {
            var users = chatService.users;
            document.getElementById("users").innerHTML =
                "<b>Online:</b> " + users.join(", ");
        }

        function log(text) {
            var output = document.getElementById("output");
            output.innerHTML += text + "\n";
            output.scrollTop = output.scrollHeight;
        }
    </script>
</head>
<body>
    <div id="loginForm" style="display:none">
        <input id="username" placeholder="Username">
        <button onclick="login()">Login</button>
    </div>

    <div id="chatForm" style="display:none">
        <div id="users"></div>
        <textarea id="output" rows="15" cols="60" readonly></textarea><br>
        <input id="message" placeholder="Message" onkeypress="if(event.key==='Enter')sendMessage()">
        <button onclick="sendMessage()">Send</button>
    </div>
</body>
</html>
```

--------------------------------

### QSignalTransition Class

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.14.0.linux-gcc-amd64.txt

Documentation for the QSignalTransition class, including its private signal structure and virtual method table.

```APIDOC
## QSignalTransition Class

### Description
Provides details on the QSignalTransition class, its private signal implementation, and its virtual function table (Vtable).

### Details
- **size**: 16
- **align**: 8
- **base size**: 16
- **base align**: 8

### Vtable for QSignalTransition
- **_ZTV17QSignalTransition**: 16 entries
  - **0**: (int (*)(...))0
  - **8**: (int (*)(...))(& _ZTI17QSignalTransition)
  - **16**: (int (*)(...))QSignalTransition::metaObject
  - **24**: (int (*)(...))QSignalTransition::qt_metacast
  - **32**: (int (*)(...))QSignalTransition::qt_metacall
  - **40**: (int (*)(...))QSignalTransition::~QSignalTransition
  - **48**: (int (*)(...))QSignalTransition::~QSignalTransition
  - **56**: (int (*)(...))QSignalTransition::event
  - **64**: (int (*)(...))QObject::eventFilter
  - **72**: (int (*)(...))QObject::timerEvent
  - **80**: (int (*)(...))QObject::childEvent
  - **88**: (int (*)(...))QObject::customEvent
  - **96**: (int (*)(...))QObject::connectNotify
  - **104**: (int (*)(...))QObject::disconnectNotify
  - **112**: (int (*)(...))QSignalTransition::eventTest
  - **120**: (int (*)(...))QSignalTransition::onTransition
```

--------------------------------

### QStateMachine Class Documentation

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.12.0.linux-gcc-amd64.txt

Details about the QStateMachine class, including its size, alignment, base class information, and virtual function table.

```APIDOC
## QStateMachine Class

### Description
Provides information about the QStateMachine class, its memory layout, and its virtual function table.

### Class Details
- **Size**: 16 bytes
- **Alignment**: 8 bytes
- **Base Class**: QState, QAbstractState, QObject

### Virtual Function Table (Vtable) for QStateMachine

#### `_ZTV13QStateMachine`
- **Entries**: 20
- **Function Pointers**:
  - `0`: (int (*)(...))0
  - `8`: (int (*)(...))(& _ZTI13QStateMachine)
  - `16`: (int (*)(...))QStateMachine::metaObject
  - `24`: (int (*)(...))QStateMachine::qt_metacast
  - `32`: (int (*)(...))QStateMachine::qt_metacall
  - `40`: (int (*)(...))QStateMachine::~QStateMachine
  - `48`: (int (*)(...))QStateMachine::~QStateMachine
  - `56`: (int (*)(...))QStateMachine::event
  - `64`: (int (*)(...))QStateMachine::eventFilter
  - `72`: (int (*)(...))QObject::timerEvent
  - `80`: (int (*)(...))QObject::childEvent
  - `88`: (int (*)(...))QObject::customEvent
  - `96`: (int (*)(...))QObject::connectNotify
  - `104`: (int (*)(...))QObject::disconnectNotify
  - `112`: (int (*)(...))QStateMachine::onEntry
  - `120`: (int (*)(...))QStateMachine::onExit
  - `128`: (int (*)(...))QStateMachine::beginSelectTransitions
  - `136`: (int (*)(...))QStateMachine::endSelectTransitions
  - `144`: (int (*)(...))QStateMachine::beginMicrostep
  - `152`: (int (*)(...))QStateMachine::endMicrostep
```

--------------------------------

### QWebChannel JavaScript Constructor

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Describes the initialization of the QWebChannel on the client side using a transport object.

```APIDOC
## QWebChannel(transport, callback)

### Description
Initializes the client-side QWebChannel. Once the transport is ready, the callback is executed with the initialized channel instance.

### Parameters
- **transport** (Object) - The transport object (e.g., WebSocket) used for communication.
- **callback** (Function) - A function called when the channel is initialized, receiving the channel object as an argument.
```

--------------------------------

### Manage QObject References

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Interact with QObject instances returned from methods, including property access, signal connections, and lifecycle management.

```javascript
new QWebChannel(socket, function(channel) {
    var factory = channel.objects.factory;

    // Method returning a QObject
    factory.createWidget("button", function(widget) {
        console.log("Created widget:", widget.__id__);

        // Access widget's properties
        console.log("Widget name:", widget.name);

        // Call widget's methods
        widget.click();

        // Connect to widget's signals
        widget.clicked.connect(function() {
            console.log("Widget was clicked");
        });

        // Widget is automatically tracked by channel
        console.log(channel.objects[widget.__id__] === widget);  // true

        // Clean up when done
        widget.deleteLater();

        // After deletion, widget becomes empty object
        widget.destroyed.connect(function() {
            console.log("Widget destroyed");
            console.log(Object.keys(widget).length);  // 0
        });
    });

    // QObjects in properties
    var parent = channel.objects.parentObject;
    var child = parent.childObject;  // Automatically unwrapped
    console.log("Child name:", child.name);

    // QObject arrays
    var items = parent.children;  // Array of QObjects
    items.forEach(function(item) {
        console.log("Child:", item.name);
    });
});
```

--------------------------------

### Class Layout for QSignalTransition

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.14.0.linux-gcc-amd64.txt

Memory layout and vtable definition for QSignalTransition.

```text
Class QSignalTransition::QPrivateSignal
   size=1 align=1
   base size=0 base align=1
QSignalTransition::QPrivateSignal (0x0x7fe6e9007ea0) 0 empty

Vtable for QSignalTransition
QSignalTransition::_ZTV17QSignalTransition: 16 entries
0     (int (*)(...))0
8     (int (*)(...))(& _ZTI17QSignalTransition)
16    (int (*)(...))QSignalTransition::metaObject
24    (int (*)(...))QSignalTransition::qt_metacast
32    (int (*)(...))QSignalTransition::qt_metacall
40    (int (*)(...))QSignalTransition::~QSignalTransition
48    (int (*)(...))QSignalTransition::~QSignalTransition
56    (int (*)(...))QSignalTransition::event
64    (int (*)(...))QObject::eventFilter
72    (int (*)(...))QObject::timerEvent
80    (int (*)(...))QObject::childEvent
88    (int (*)(...))QObject::customEvent
96    (int (*)(...))QObject::connectNotify
104   (int (*)(...))QObject::disconnectNotify
112   (int (*)(...))QSignalTransition::eventTest
120   (int (*)(...))QSignalTransition::onTransition

Class QSignalTransition
   size=16 align=8
   base size=16 base align=8
QSignalTransition (0x0x7fe6e9009888) 0
    vptr=((& QSignalTransition::_ZTV17QSignalTransition) + 16)
  QAbstractTransition (0x0x7fe6e90098f0) 0
      primary-for QSignalTransition (0x0x7fe6e9009888)
    QObject (0x0x7fe6e9007e40) 0
        primary-for QAbstractTransition (0x0x7fe6e90098f0)
```

--------------------------------

### registerObject / registerObjects

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Illustrates how to register single or multiple QObjects with the QWebChannel for remote access.

```APIDOC
## QWebChannel - Object Registration

### Description
This section details the methods for registering QObjects with `QWebChannel`. You can register individual objects using `registerObject` or multiple objects at once using `registerObjects` with a `QHash`. It also shows how to retrieve all registered objects and how to deregister an object.

### Method
`registerObject(const QString &name, QObject *object)`
`registerObjects(const QHash<QString, QObject *> &objects)`
`registeredObjects() const`
`deregisterObject(QObject *object)`

### Endpoint
N/A (These are C++ API calls)

### Parameters
#### Path Parameters
N/A

#### Query Parameters
N/A

#### Request Body
N/A

### Request Example
```cpp
#include <QWebChannel>

QWebChannel channel;
MyService *service = new MyService(&channel);
channel.registerObject(QStringLiteral("service"), service);

// Bulk registration using QHash
QHash<QString, QObject*> objects;
objects.insert("calculator", new Calculator(&channel));
objects.insert("storage", new StorageManager(&channel));
objects.insert("auth", new AuthService(&channel));
channel.registerObjects(objects);

// Get all registered objects
QHash<QString, QObject*> registered = channel.registeredObjects();
for (auto it = registered.begin(); it != registered.end(); ++it) {
    qDebug() << "Registered:" << it.key() << "->" << it.value()->metaObject()->className();
}

// Deregister an object (clients receive destroyed signal)
channel.deregisterObject(service);
```

### Response
N/A (This is a C++ code example)
```

--------------------------------

### Configure CMake for QtWebChannel QML Application

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatclient-qml/CMakeLists.txt

Defines the project, finds required Qt6 components, sets up the executable, and manages resources and deployment scripts.

```cmake
cmake_minimum_required(VERSION 3.16)
project(qmlchatclient LANGUAGES CXX)

find_package(Qt6 REQUIRED COMPONENTS Core Gui Quick WebChannel Widgets)

qt_standard_project_setup()

qt_add_executable(qmlchatclient
    main.cpp
)

set_target_properties(qmlchatclient PROPERTIES
    WIN32_EXECUTABLE TRUE
    MACOSX_BUNDLE TRUE
)

target_link_libraries(qmlchatclient PRIVATE
    Qt::Core
    Qt::Gui
    Qt::Quick
    Qt::Widgets
)

# Resources:
set(data_resource_files
    "qmlchatclient.qml"
    "LoginForm.ui.qml"
    "MainForm.ui.qml"
    "${QT_QWEBCHANNEL_JS_PATH}"
)

set_source_files_properties("${QT_QWEBCHANNEL_JS_PATH}" PROPERTIES
    QT_RESOURCE_ALIAS "qwebchannel.js"
)

qt6_add_resources(qmlchatclient "data"
    PREFIX
        "/"
    FILES
        ${data_resource_files}
)

install(TARGETS qmlchatclient
    BUNDLE DESTINATION .
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
)
qt_generate_deploy_qml_app_script(
    TARGET qmlchatclient
    OUTPUT_SCRIPT deploy_script
    MACOS_BUNDLE_POST_BUILD
    NO_UNSUPPORTED_PLATFORM_ERROR
    DEPLOY_USER_QML_MODULES_ON_UNSUPPORTED_PLATFORM
)
install(SCRIPT ${deploy_script})
```

--------------------------------

### QFileDevice Class

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.11.0.linux-gcc-amd64.txt

Information about the QFileDevice class, including its size, alignment, base classes, and vtable.

```APIDOC
## QFileDevice Class

### Description
Details about the QFileDevice class, its inheritance from QIODevice and QObject, and its virtual function table.

### Class Information
- **Size**: 16 bytes
- **Alignment**: 8 bytes

### Vtable for QFileDevice
- **Entries**: 34
  - Entry 0: (int (*)(...))0
  - Entry 8: (int (*)(...))(& _ZTI11QFileDevice)
  - Entry 16: (int (*)(...))QFileDevice::metaObject
  - Entry 24: (int (*)(...))QFileDevice::qt_metacast
  - Entry 32: (int (*)(...))QFileDevice::qt_metacall
  - Entry 40: (int (*)(...))QFileDevice::~QFileDevice
  - Entry 48: (int (*)(...))QFileDevice::~QFileDevice
  - Entry 56: (int (*)(...))QObject::event
  - Entry 64: (int (*)(...))QObject::eventFilter
  - Entry 72: (int (*)(...))QObject::timerEvent
  - Entry 80: (int (*)(...))QObject::childEvent
  - Entry 88: (int (*)(...))QObject::customEvent
  - Entry 96: (int (*)(...))QObject::connectNotify
  - Entry 104: (int (*)(...))QObject::disconnectNotify
  - Entry 112: (int (*)(...))QFileDevice::isSequential
  - Entry 120: (int (*)(...))QIODevice::open
  - Entry 128: (int (*)(...))QFileDevice::close
  - Entry 136: (int (*)(...))QFileDevice::pos
  - Entry 144: (int (*)(...))QFileDevice::size
  - Entry 152: (int (*)(...))QFileDevice::seek
  - Entry 160: (int (*)(...))QFileDevice::atEnd
  - Entry 168: (int (*)(...))QIODevice::reset
  - Entry 176: (int (*)(...))QIODevice::bytesAvailable
  - Entry 184: (int (*)(...))QIODevice::bytesToWrite
  - Entry 192: (int (*)(...))QIODevice::canReadLine
  - Entry 200: (int (*)(...))QIODevice::waitForReadyRead
  - Entry 208: (int (*)(...))QIODevice::waitForBytesWritten
  - Entry 216: (int (*)(...))QFileDevice::readData
  - Entry 224: (int (*)(...))QFileDevice::readLineData
  - Entry 232: (int (*)(...))QFileDevice::writeData
  - Entry 240: (int (*)(...))QFileDevice::fileName
  - Entry 248: (int (*)(...))QFileDevice::resize
  - Entry 256: (int (*)(...))QFileDevice::permissions
  - Entry 264: (int (*)(...))QFileDevice::setPermissions

### Constructor Example
```
QFileDevice (0x0x7fa3b4d1a7b8) 0
```
- **vptr**: ((& QFileDevice::_ZTV11QFileDevice) + 16u)

### Base Classes
- **QIODevice**: (0x0x7fa3b4d1a888)
  - **primary-for**: QFileDevice (0x0x7fa3b4d1a7b8)
- **QObject**: (0x0x7fa3b4d30120)
  - **primary-for**: QIODevice (0x0x7fa3b4d1a888)
```

--------------------------------

### Deployment Script Generation

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatserver-cpp/CMakeLists.txt

Generates a deployment script for the 'chatserver' application, ensuring compatibility across platforms.

```cmake
qt_generate_deploy_app_script(
    TARGET chatserver
    OUTPUT_SCRIPT deploy_script
    NO_UNSUPPORTED_PLATFORM_ERROR
)
install(SCRIPT ${deploy_script})
```

--------------------------------

### Manage client connections with connectTo and disconnectFrom

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Connect or disconnect transport instances to the QWebChannel to manage communication with clients.

```cpp
#include <QWebChannel>
#include <QWebSocketServer>

QWebSocketServer server("Server", QWebSocketServer::NonSecureMode);
server.listen(QHostAddress::Any, 12345);

QWebChannel channel;
QList<WebSocketTransport*> connectedTransports;

// Connect new clients
QObject::connect(&server, &QWebSocketServer::newConnection, [&]() {
    QWebSocket *socket = server.nextPendingConnection();
    WebSocketTransport *transport = new WebSocketTransport(socket);

    // Connect transport to channel
    channel.connectTo(transport);
    connectedTransports.append(transport);

    qDebug() << "Client connected, total:" << connectedTransports.size();
});

// Disconnect a specific client
void disconnectClient(WebSocketTransport *transport) {
    channel.disconnectFrom(transport);
    connectedTransports.removeOne(transport);
    transport->deleteLater();
    qDebug() << "Client disconnected";
}

// Disconnect all clients
void disconnectAllClients() {
    for (WebSocketTransport *transport : connectedTransports) {
        channel.disconnectFrom(transport);
        transport->deleteLater();
    }
    connectedTransports.clear();
}
```

--------------------------------

### CMake Project Configuration

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatserver-cpp/CMakeLists.txt

Sets up the minimum CMake version, project name, and language. Includes a check to prevent building on Android.

```cmake
cmake_minimum_required(VERSION 3.16)
project(chatserver LANGUAGES CXX)
```

```cmake
if (ANDROID)
    message(FATAL_ERROR "This project cannot be built on Android.")
endif()
```

--------------------------------

### QSignalTransition Vtable

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.11.0.linux-gcc-amd64.txt

Lists the virtual function table entries for the QSignalTransition class, including metaObject, qt_metacast, eventTest, and onTransition.

```c++
Vtable for QSignalTransition
QSignalTransition::_ZTV17QSignalTransition: 16u entries
0     (int (*)(...))0
8     (int (*)(...))(& _ZTI17QSignalTransition)
16    (int (*)(...))QSignalTransition::metaObject
24    (int (*)(...))QSignalTransition::qt_metacast
32    (int (*)(...))QSignalTransition::qt_metacall
40    (int (*)(...))QSignalTransition::~QSignalTransition
48    (int (*)(...))QSignalTransition::~QSignalTransition
56    (int (*)(...))QSignalTransition::event
64    (int (*)(...))QObject::eventFilter
72    (int (*)(...))QObject::timerEvent
80    (int (*)(...))QObject::childEvent
88    (int (*)(...))QObject::customEvent
96    (int (*)(...))QObject::connectNotify
104   (int (*)(...))QObject::disconnectNotify
112   (int (*)(...))QSignalTransition::eventTest
120   (int (*)(...))QSignalTransition::onTransition
```

--------------------------------

### Qt Module Discovery

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatserver-cpp/CMakeLists.txt

Finds and makes the necessary Qt6 modules available for the project. Requires Core, WebChannel, and WebSockets.

```cmake
set(CMAKE_AUTOMOC ON)

find_package(Qt6 REQUIRED COMPONENTS Core WebChannel WebSockets)
```

--------------------------------

### Linking Libraries

Source: https://github.com/qtproject/qtwebchannel/blob/dev/examples/webchannel/chatserver-cpp/CMakeLists.txt

Links the 'chatserver' target against required Qt modules: Core, WebChannel, and WebSockets.

```cmake
target_link_libraries(chatserver PUBLIC
    Qt::Core
    Qt::WebChannel
    Qt::WebSockets
)
```

--------------------------------

### Class Layout for QSignalMapper

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.14.0.linux-gcc-amd64.txt

Memory layout and vtable definition for QSignalMapper.

```text
Class QSignalMapper::QPrivateSignal
   size=1 align=1
   base size=0 base align=1
QSignalMapper::QPrivateSignal (0x0x7fe6e9007c60) 0 empty

Vtable for QSignalMapper
QSignalMapper::_ZTV13QSignalMapper: 14 entries
0     (int (*)(...))0
8     (int (*)(...))(& _ZTI13QSignalMapper)
16    (int (*)(...))QSignalMapper::metaObject
24    (int (*)(...))QSignalMapper::qt_metacast
32    (int (*)(...))QSignalMapper::qt_metacall
40    (int (*)(...))QSignalMapper::~QSignalMapper
48    (int (*)(...))QSignalMapper::~QSignalMapper
56    (int (*)(...))QObject::event
64    (int (*)(...))QObject::eventFilter
72    (int (*)(...))QObject::timerEvent
80    (int (*)(...))QObject::childEvent
88    (int (*)(...))QObject::customEvent
96    (int (*)(...))QObject::connectNotify
104   (int (*)(...))QObject::disconnectNotify

Class QSignalMapper
   size=16 align=8
   base size=16 base align=8
QSignalMapper (0x0x7fe6e9009820) 0
    vptr=((& QSignalMapper::_ZTV13QSignalMapper) + 16)
  QObject (0x0x7fe6e9007c00) 0
      primary-for QSignalMapper (0x0x7fe6e9009820)
```

--------------------------------

### Qt Test Build Execution

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/CMakeLists.txt

Executes the build process for Qt tests. This is a standard command for setting up test builds within a Qt project.

```cmake
qt_build_tests()
```

--------------------------------

### Add WebChannel to QMake Project

Source: https://github.com/qtproject/qtwebchannel/blob/dev/README.md

Include the webchannel module in your QMake project file.

```qmake
QT += webchannel
```

--------------------------------

### QStandardPaths Class Documentation

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.12.0.linux-gcc-amd64.txt

Details about the QStandardPaths class, including its size and alignment.

```APIDOC
## QStandardPaths Class

### Description
Provides information about the QStandardPaths class, including its memory layout.

### Class Details
- **Size**: 1 byte
- **Alignment**: 1 byte
```

--------------------------------

### QStringListModel Class Documentation

Source: https://github.com/qtproject/qtwebchannel/blob/dev/tests/auto/bic/data/QtWebChannel.5.12.0.linux-gcc-amd64.txt

Details about the QStringListModel class, including its virtual function table.

```APIDOC
## QStringListModel Class

### Description
Provides information about the QStringListModel class and its virtual function table.

### Virtual Function Table (Vtable) for QStringListModel

#### `_ZTV16QStringListModel`
- **Entries**: 48
- **Function Pointers**:
  - `0`: (int (*)(...))0
  - `8`: (int (*)(...))(& _ZTI16QStringListModel)
  - `16`: (int (*)(...))QStringListModel::metaObject
  - `24`: (int (*)(...))QStringListModel::qt_metacast
  - `32`: (int (*)(...))QStringListModel::qt_metacall
  - `40`: (int (*)(...))QStringListModel::~QStringListModel
  - `48`: (int (*)(...))QStringListModel::~QStringListModel
  - `56`: (int (*)(...))QObject::event
  - `64`: (int (*)(...))QObject::eventFilter
  - `72`: (int (*)(...))QObject::timerEvent
  - `80`: (int (*)(...))QObject::childEvent
```

--------------------------------

### Initializing QWebChannel in JavaScript

Source: https://context7.com/qtproject/qtwebchannel/llms.txt

Initialize the client-side channel by passing a transport object to the QWebChannel constructor. Access published objects via the channel.objects property once the initialization callback triggers.

```javascript
// Browser with WebSocket transport
var socket = new WebSocket("ws://localhost:12345");

socket.onopen = function() {
    // Create QWebChannel when socket is ready
    new QWebChannel(socket, function(channel) {
        console.log("WebChannel initialized");

        // Access registered objects via channel.objects
        var service = channel.objects.myService;
        console.log("Service status:", service.status);

        // Make objects globally accessible
        window.myService = service;
    });
};

socket.onerror = function(error) {
    console.error("WebSocket error:", error);
};

socket.onclose = function() {
    console.log("WebSocket closed");
};
```