带有 Gui 的 Websocket答案

【问题标题】：Websocket with Gui带有 Gui 的 Websocket
【发布时间】：2020-06-17 14:54:35
【问题描述】：

我的第一个类允许我连接到 websocket，第二个类允许我尝试用图表来显示数据。

在代码上，我只是尝试在 weboscket 使用 pyqtgraph 运行时显示一个图表，但窗口完全是错误的。

谢谢

import asyncio
import json
import websockets
from asyncqt import asyncSlot, QtCore
import pyqtgraph as pg

class Ws(QtCore.QObject):
    dataChanged = QtCore.pyqtSignal(dict)

    def __init__(self, parent=None):
        super().__init__(parent)
        self._websocket = None

    @property
    def websocket(self):
        return self._websocket

    async def connect(self, server,):
        self._websocket = await websockets.connect(server)
        await self.on_message()

    @asyncSlot(dict)
    async def on_message(self):
        while True:
            message = await self.websocket.recv()
            message = json.loads(message)
            self.dataChanged.emit(message)


    @asyncSlot(dict)
    async def send_message(self, message):
        while self.websocket is None:
            await asyncio.sleep(0.2)
        data = json.dumps(message)
        await self.websocket.send(data)

    def run(self):
        loop = asyncio.get_event_loop()
        loop.create_task(self.connect(server="wss://www.bitmex.com/realtime"))
        loop.run_forever()

class TestUi(object):
    def __init__(self):

        self.plt = pg.plot()

        self.ws = Ws()
        self.ws.send_message(
            {"op": "subscribe", "args": ["instrument:XBTUSD"]})
        self.ws.dataChanged.connect(self.update_data)
        self.ws.run()

    def update_data(self, data):
        print(data)


if __name__ == "__main__":
    u = TestUi()

【问题讨论】：

标签： python python-3.x asynchronous websocket pyqt5

【解决方案1】：

你要设置asyncqt的eventloop：

import asyncio
import json
import sys
import websockets


from PyQt5 import QtCore, QtWidgets

import pyqtgraph as pg

from asyncqt import QEventLoop, asyncSlot


class Ws(QtCore.QObject):
    dataChanged = QtCore.pyqtSignal(dict)

    def __init__(self, parent=None):
        super().__init__(parent)
        self._websocket = None

    @property
    def websocket(self):
        return self._websocket

    async def connect(
        self, server,
    ):
        self._websocket = await websockets.connect(server)
        await self.on_message()

    @asyncSlot(dict)
    async def on_message(self):
        while True:
            message = await self.websocket.recv()
            message = json.loads(message)
            self.dataChanged.emit(message)

    @asyncSlot(dict)
    async def send_message(self, message):
        while self.websocket is None:
            await asyncio.sleep(0.2)
        data = json.dumps(message)
        await self.websocket.send(data)

    def run(self):
        loop = asyncio.get_event_loop()
        loop.create_task(self.connect(server="wss://www.bitmex.com/realtime"))
        loop.run_forever()


class TestUi(object):
    def __init__(self):

        app = QtWidgets.QApplication(sys.argv)
        loop = QEventLoop(app)
        asyncio.set_event_loop(loop)

        self.plt = pg.plot()

        self.ws = Ws()
        self.ws.send_message({"op": "subscribe", "args": ["instrument:XBTUSD"]})
        self.ws.dataChanged.connect(self.update_data)
        self.ws.run()

    def update_data(self, data):
        print(data)


if __name__ == "__main__":
    u = TestUi()

【讨论】：