PyQt应用执行Discord RPC更新函数时无响应崩溃求助

问题核心原因 #

你当前的代码里，onclick函数用了while True+time.sleep(100)，直接把Qt的主线程卡死了——Qt的UI事件循环完全没法运行，自然会无响应。哪怕改成单次调用，RPC.update本身的同步阻塞操作也会短暂卡住主线程。另外，你在模块最外层直接调用RPC.connect()，这个连接操作在主线程执行，一旦Discord响应慢，也会拖垮UI。

具体修复方案 #

方案1：用QTimer定时更新（最简单，适配你的场景）

用Qt自带的QTimer代替死循环和sleep，定时触发RPC更新，完全不阻塞主线程：

from pypresence import Presence 
import time

from PyQt5 import QtCore, QtGui, QtWidgets

client_id = "997609359427260416"

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(485, 425)
        MainWindow.setStyleSheet("background-color: #1f1f1f;""font: 75 8pt \"Arial\";")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget, clicked = lambda: self.onclick())
        self.pushButton.setGeometry(QtCore.QRect(160, 350, 161, 51))
        self.pushButton.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.pushButton.setAutoFillBackground(False)
        self.pushButton.setStyleSheet("background-color: #a30b00;""color: white;""transition: 0.25s;""font: 12pt;""border-radius: 8px;""")
        self.pushButton.setObjectName("pushButton")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(120, 10, 251, 31))
        self.label.setStyleSheet("color: white;""font: 18pt")
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(210, 40, 91, 16))
        self.label_2.setStyleSheet("color: #a30b00;""font: 12pt")
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(80, 100, 321, 31))
        self.lineEdit.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit.setObjectName("lineEdit")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(80, 80, 121, 16))
        self.label_3.setStyleSheet("color: white;""font-size: 12pt")
        self.label_3.setObjectName("label_3")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(80, 170, 321, 31))
        self.lineEdit_2.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.label_4 = QtWidgets.QLabel(self.centralwidget)
        self.label_4.setGeometry(QtCore.QRect(80, 150, 121, 16))
        self.label_4.setStyleSheet("color: white;""font-size: 12pt")
        self.label_4.setObjectName("label_4")
        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_3.setGeometry(QtCore.QRect(80, 230, 321, 31))
        self.lineEdit_3.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit_3.setObjectName("lineEdit_3")
        self.label_5 = QtWidgets.QLabel(self.centralwidget)
        self.label_5.setGeometry(QtCore.QRect(80, 210, 121, 16))
        self.label_5.setStyleSheet("color: white;""font-size: 12pt")
        self.label_5.setObjectName("label_5")
        self.lineEdit_4 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_4.setGeometry(QtCore.QRect(80, 290, 321, 31))
        self.lineEdit_4.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit_4.setObjectName("lineEdit_4")
        self.label_6 = QtWidgets.QLabel(self.centralwidget)
        self.label_6.setGeometry(QtCore.QRect(80, 270, 121, 16))
        self.label_6.setStyleSheet("color: white;""font-size: 12pt")
        self.label_6.setObjectName("label_6")
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        # 新增定时器相关初始化
        self.rpc_timer = QtCore.QTimer()
        self.rpc_timer.timeout.connect(self.update_rpc)
        self.rpc = None
        self.start_time = int(time.time())

    def onclick(self):
        # 点击按钮时初始化RPC连接
        if not self.rpc:
            self.rpc = Presence(client_id)
            self.rpc.connect()
        # 启动定时器，每100秒更新一次（单位是毫秒）
        self.rpc_timer.start(100 * 1000)
        # 先手动更新一次
        self.update_rpc()

    def update_rpc(self):
        value1 = self.lineEdit.text()
        if self.rpc:
            self.rpc.update(
                large_image = "large",
                large_text = "test",
                details = value1,
                state = "Presence Changer",
                start = self.start_time,
                buttons = [{"label": "kndxiu on TikTok", "url": "https://tiktok.com/@kndxiu"}, {"label": "Website", "url": "https://kndxiu.xyz"}]
            )

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "SAVE"))
        self.label.setText(_translate("MainWindow", "Discord RP Changer"))
        self.label_2.setText(_translate("MainWindow", "by kndxiu."))
        self.label_3.setText(_translate("MainWindow", "test"))
        self.label_4.setText(_translate("MainWindow", "test"))
        self.label_5.setText(_translate("MainWindow", "test"))
        self.label_6.setText(_translate("MainWindow", "test"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

方案2：用QThread子线程处理RPC逻辑（适合复杂异步场景）

如果RPC操作存在长时间阻塞风险，把整个RPC逻辑放到子线程，彻底隔离主线程：

from pypresence import Presence 
import time

from PyQt5 import QtCore, QtGui, QtWidgets

client_id = "997609359427260416"

class RPCWorker(QtCore.QThread):
    def __init__(self):
        super().__init__()
        self.rpc = None
        self.start_time = int(time.time())
        self.details = ""
        self.running = False

    def run(self):
        self.rpc = Presence(client_id)
        self.rpc.connect()
        self.running = True
        while self.running:
            self.rpc.update(
                large_image = "large",
                large_text = "test",
                details = self.details,
                state = "Presence Changer",
                start = self.start_time,
                buttons = [{"label": "kndxiu on TikTok", "url": "https://tiktok.com/@kndxiu"}, {"label": "Website", "url": "https://kndxiu.xyz"}]
            )
            time.sleep(100)

    def stop(self):
        self.running = False
        self.wait()
        if self.rpc:
            self.rpc.close()

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(485, 425)
        MainWindow.setStyleSheet("background-color: #1f1f1f;""font: 75 8pt \"Arial\";")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget, clicked = lambda: self.onclick())
        self.pushButton.setGeometry(QtCore.QRect(160, 350, 161, 51))
        self.pushButton.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.pushButton.setAutoFillBackground(False)
        self.pushButton.setStyleSheet("background-color: #a30b00;""color: white;""transition: 0.25s;""font: 12pt;""border-radius: 8px;""")
        self.pushButton.setObjectName("pushButton")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(120, 10, 251, 31))
        self.label.setStyleSheet("color: white;""font: 18pt")
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(210, 40, 91, 16))
        self.label_2.setStyleSheet("color: #a30b00;""font: 12pt")
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(80, 100, 321, 31))
        self.lineEdit.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit.setObjectName("lineEdit")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(80, 80, 121, 16))
        self.label_3.setStyleSheet("color: white;""font-size: 12pt")
        self.label_3.setObjectName("label_3")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(80, 170, 321, 31))
        self.lineEdit_2.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.label_4 = QtWidgets.QLabel(self.centralwidget)
        self.label_4.setGeometry(QtCore.QRect(80, 150, 121, 16))
        self.label_4.setStyleSheet("color: white;""font-size: 12pt")
        self.label_4.setObjectName("label_4")
        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_3.setGeometry(QtCore.QRect(80, 230, 321, 31))
        self.lineEdit_3.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit_3.setObjectName("lineEdit_3")
        self.label_5 = QtWidgets.QLabel(self.centralwidget)
        self.label_5.setGeometry(QtCore.QRect(80, 210, 121, 16))
        self.label_5.setStyleSheet("color: white;""font-size: 12pt")
        self.label_5.setObjectName("label_5")
        self.lineEdit_4 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_4.setGeometry(QtCore.QRect(80, 290, 321, 31))
        self.lineEdit_4.setStyleSheet("background-color: rgb(44, 44, 44);""border: 2px solid rgb(60, 60, 60);""border-radius: 5px;""color: white;")
        self.lineEdit_4.setObjectName("lineEdit_4")
        self.label_6 = QtWidgets.QLabel(self.centralwidget)
        self.label_6.setGeometry(QtCore.QRect(80, 270, 121, 16))
        self.label_6.setStyleSheet("color: white;""font-size: 12pt")
        self.label_6.setObjectName("label_6")
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        # 初始化子线程
        self.rpc_worker = RPCWorker()

    def onclick(self):
        # 传递输入框的值给子线程
        self.rpc_worker.details = self.lineEdit.text()
        if not self.rpc_worker.isRunning():
            self.rpc_worker.start()

    # 窗口关闭时停止线程
    def closeEvent(self, event):
        self.rpc_worker.stop()
        event.accept()

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "SAVE"))
        self.label.setText(_translate("MainWindow", "Discord RP Changer"))
        self.label_2.setText(_translate("MainWindow", "by kndxiu."))
        self.label_3.setText(_translate("MainWindow", "test"))
        self.label_4.setText(_translate("MainWindow", "test"))
        self.label_5.setText(_translate("MainWindow", "test"))
        self.label_6.setText(_translate("MainWindow", "test"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

额外注意事项 #

• 绝对不要在主线程执行任何阻塞操作（比如time.sleep、网络请求），Qt的UI完全依赖主线程的事件循环维持响应
• 建议给RPC.connect()和RPC.update()加上try-except捕获异常，避免Discord未启动或连接失败时直接崩溃
• 子线程里禁止直接操作UI元素，必须通过信号槽传递数据，这是Qt的硬性规则

内容的提问来源于stack exchange，提问作者kondziu