PyQt5中线程挂起终止和唤醒

旧城等待， 2022-03-01 10:58 468阅读 0赞

线程的终止问题一直是可比较头疼的问题，今天找到了一个比较好的例子，分享给大家  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2plZWttYXJ5_size_16_color_FFFFFF_t_70]

#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    import ctypes
    
    from PyQt5.QtCore import QThread, pyqtSignal
    from PyQt5.QtWidgets import QWidget, QVBoxLayout, QProgressBar, QPushButton
    import win32con
    from win32process import SuspendThread, ResumeThread
    
    
    
    class Worker(QThread):
    
        valueChanged = pyqtSignal(int)  # 值变化信号
        handle = -1
    
        def run(self):
            try:
            	# 这个目前我没弄明白这里写法 
                self.handle = ctypes.windll.kernel32.OpenThread(  # @UndefinedVariable
                    win32con.PROCESS_ALL_ACCESS, False, int(QThread.currentThreadId()))
            except Exception as e:
                print('get thread handle failed', e)
            print('thread id', int(QThread.currentThreadId()))
            # 循环发送信号
            for i in range(1, 101):
                print('value', i)
                self.valueChanged.emit(i)
                QThread.sleep(1)
    
    
    class Window(QWidget):
    
        def __init__(self, *args, **kwargs):
            super(Window, self).__init__(*args, **kwargs)
            # 垂直布局
            layout = QVBoxLayout(self)
            self.progressBar = QProgressBar(self)
            self.progressBar.setRange(0, 100)
            layout.addWidget(self.progressBar)
            self.startButton = QPushButton('开启线程', self, clicked=self.onStart)
            layout.addWidget(self.startButton)
            self.suspendButton = QPushButton('挂起线程', self, clicked=self.onSuspendThread, enabled=False)
            layout.addWidget(self.suspendButton)
            self.resumeButton = QPushButton('恢复线程', self, clicked=self.onResumeThread, enabled=False)
            layout.addWidget(self.resumeButton)
            self.stopButton = QPushButton('终止线程', self, clicked=self.onStopThread, enabled=False)
            layout.addWidget(self.stopButton)
    
            # 当前线程id
            print('main id', int(QThread.currentThreadId()))
    
            # 子线程
            self._thread = Worker(self)
            self._thread.finished.connect(self._thread.deleteLater)
            self._thread.valueChanged.connect(self.progressBar.setValue)
    
        def onStart(self):
            print('main id', int(QThread.currentThreadId()))
            self._thread.start()  # 启动线程
            self.startButton.setEnabled(False)
            self.suspendButton.setEnabled(True)
            self.stopButton.setEnabled(True)
    
        def onSuspendThread(self):
            if self._thread.handle == -1:
                return print('handle is wrong')
            ret = SuspendThread(self._thread.handle)
            print('挂起线程', self._thread.handle, ret)
            self.suspendButton.setEnabled(False)
            self.resumeButton.setEnabled(True)
    
        def onResumeThread(self):
            if self._thread.handle == -1:
                return print('handle is wrong')
            ret = ResumeThread(self._thread.handle)
            print('恢复线程', self._thread.handle, ret)
            self.suspendButton.setEnabled(True)
            self.resumeButton.setEnabled(False)
    
        def onStopThread(self):
            self.startButton.setEnabled(False)
            self.suspendButton.setEnabled(False)
            self.resumeButton.setEnabled(False)
            ret = ctypes.windll.kernel32.TerminateThread(  # @UndefinedVariable
                self._thread.handle, 0)
            print('终止线程', self._thread.handle, ret)
            self.stopButton.setEnabled(False)
    
        def closeEvent(self, event):
            if self._thread.isRunning():
                self._thread.quit()
                # 强制
                # self._thread.terminate()
            del self._thread
            super(Window, self).closeEvent(event)
    
    
    if __name__ == '__main__':
        import sys
        import os
        print('pid', os.getpid())
        from PyQt5.QtWidgets import QApplication
        app = QApplication(sys.argv)
        w = Window()
        w.show()
        sys.exit(app.exec_())

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2plZWttYXJ5_size_16_color_FFFFFF_t_70]: /images/20220301/8bbbcc1435ca486fb711c0ebabf57ab9.png