How to Integrate PyQt6 with Flask

In this PyQt6 article we want to learn How to Integrate PyQt6 with Flask, so Python is powerful programming language, and it offers many different libraries for building desktop applications and web based applications. two popular libraries for building desktop applications and web applications are PyQt6 and Flask. in this article we will discuss how to integrate PyQt6 with Flask to build a web application with a desktop-like GUI.

What is PyQt6 ?

PyQt6 is set of Python bindings for the Qt framework, which is cross platform application development framework widely used for building desktop applications. PyQt6 allows developers to create desktop applications with a modern user interface that runs on multiple operating systems.

What is Flask ?

Flask is lightweight Python web framework that allows developers to build web applications quickly and easily. Flask is known for its simplicity, flexibility, and easy of use. Flask is commonly used for building small to medium-sized web applications and APIs.

Why Integrate PyQt6 with Flask ?

Integrating PyQt6 with Flask allows developers to create web applications with modern desktop like GUI. this can be useful for applications that require a richer user interface than what can be achieved with HTML, CSS and JavaScript alone. Also integrating PyQt6 with Flask can allow developers to reuse code between desktop and web applications and it makes development more efficient.

How to Integrate PyQt6 with Flask

First of all we need to install the required libraries which is Flask and PyQt6.

pip install PyQt6 Flask flask-socketio

1	pip install PyQt6 Flask flask-socketio

We also need the QtWebEngineWidgets module which provides the web engine that we want to use to display web content. you can install it like this

pip install PyQt6-WebEngine

1	pip install PyQt6-WebEngine

This is the complete code for How to Integrate PyQt6 with Flask, name the file app.py

from flask import Flask, render_template, jsonify,request
from flask_socketio import SocketIO, emit
from PyQt6.QtCore import QUrl, QObject, pyqtSlot, QThread
from PyQt6.QtWebChannel import QWebChannel
from PyQt6.QtWebEngineWidgets import QWebEngineView
from PyQt6.QtWidgets import QApplication
import sys
import threading

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)


@app.route('/')
def index():
    return render_template('index.html')


@socketio.on('connect')
def test_connect():
    emit('my response', {'data': 'Connected'})


@socketio.on('disconnect')
def test_disconnect():
    print('Client disconnected')


@app.route('/api')
def api():
    channel = QWebChannel()
    channel.registerObject('flask', request.environ['werkzeug.websocket'])
    return jsonify({'port': channel.port()})


def run_pyqt6():
    app = QApplication(sys.argv)
    view = QWebEngineView()
    view.setWindowTitle("GeeksCoders.com")
    channel = QWebChannel()
    view.page().setWebChannel(channel)
    view.load(QUrl('http://localhost:5000'))
    view.show()
    sys.exit(app.exec())


if __name__ == '__main__':
    # Start the Flask server in a separate thread
    server = threading.Thread(target=socketio.run, args=(app,))
    server.start()

    # Start the PyQt6 application in a separate thread
    pyqt6 = threading.Thread(target=run_pyqt6)
    pyqt6.start()

from flask import Flask, render_template, jsonify,request

from flask_socketio import SocketIO, emit

from PyQt6.QtCore import QUrl, QObject, pyqtSlot, QThread

from PyQt6.QtWebChannel import QWebChannel

from PyQt6.QtWebEngineWidgets import QWebEngineView

from PyQt6.QtWidgets import QApplication

import sys

import threading

app = Flask(__name__)

app.config['SECRET_KEY'] = 'secret!'

socketio = SocketIO(app)

@app.route('/')

def index():

return render_template('index.html')

@socketio.on('connect')

def test_connect():

emit('my response', {'data': 'Connected'})

@socketio.on('disconnect')

def test_disconnect():

print('Client disconnected')

@app.route('/api')

def api():

channel = QWebChannel()

channel.registerObject('flask', request.environ['werkzeug.websocket'])

return jsonify({'port': channel.port()})

def run_pyqt6():

app = QApplication(sys.argv)

view = QWebEngineView()

view.setWindowTitle("GeeksCoders.com")

channel = QWebChannel()

view.page().setWebChannel(channel)

view.load(QUrl('http://localhost:5000'))

view.show()

sys.exit(app.exec())

if __name__ == '__main__':

# Start the Flask server in a separate thread

server = threading.Thread(target=socketio.run, args=(app,))

server.start()

# Start the PyQt6 application in a separate thread

pyqt6 = threading.Thread(target=run_pyqt6)

pyqt6.start()

This is our index.html

<!doctype html>
<html>
  <head>
    <title>Flask SocketIO and PyQt6 Integration Example</title>
    <script src="//code.jquery.com/jquery-1.11.1.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
    <script>
      $(document).ready(function(){
        var socket = io.connect('http://' + document.domain + ':' + location.port);
        socket.on('my response', function(msg) {
          console.log(msg.data);
        });
      });
    </script>
  </head>
  <body>
  <h1>Welcome to GeeksCoders.com</h1>
    <h1>Flask SocketIO and PyQt6 Integration Example</h1>
    <p>Open this page in a browser and a PyQt6 window to see the integration in action.</p>
  </body>
</html>

<!doctype html>

<html>

<head>

<title>Flask SocketIO and PyQt6 Integration Example</title>

$(document).ready(function(){

var socket = io.connect('http://' + document.domain + ':' + location.port);

socket.on('my response', function(msg) {

console.log(msg.data);

});

</script>

</head>

<body>

<h1>Welcome to GeeksCoders.com</h1>

<h1>Flask SocketIO and PyQt6 Integration Example</h1>

<p>Open this page in a browser and a PyQt6 window to see the integration in action.</p>

</body>

</html>

This code sets up basic Flask application with SocketIO server that sends and receives messages. it also creates PyQt6 application that loads the Flask application in QWebEngineView and shows it in a window. when the Flask application is opened in web browser and the PyQt6 application is started, they will communicate with each other via QWebChannel and SocketIO.

Run the code and this will be the result

How to Integrate PyQt6 with Flask

What is PyQt6 ?

What is Flask ?

Why Integrate PyQt6 with Flask ?

How to Integrate PyQt6 with Flask

Learn More on Python GUI

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