Pyqt中让progressbar实时显示Qprocess进度

可以使用`QProcess`的`readyReadStandardOutput()`或`readyReadStandardError()`信号来获取进程的输出，从而获取进度信息，并将其更新到`QProgressBar`上。

例如：

import sys
from PyQt5.QtCore import Qt, QProcess
from PyQt5.QtWidgets import QApplication, QDialog, QVBoxLayout, QProgressBar, QPushButton, QTextEdit


class ProcessDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.process = QProcess(self)
        self.process.setProcessChannelMode(QProcess.MergedChannels)
        self.process.readyReadStandardOutput.connect(self.read_output)
        self.process.finished.connect(self.finished)

        self.progress_bar = QProgressBar(self)
        self.progress_bar.setAlignment(Qt.AlignCenter)
        self.progress_bar.setRange(0, 100)

        self.log = QTextEdit(self)
        self.log.setReadOnly(True)

        self.button = QPushButton('Start', self)
        self.button.clicked.connect(self.start_process)

        layout = QVBoxLayout(self)
        layout.addWidget(self.progress_bar)
        layout.addWidget(self.log)
        layout.addWidget(self.button)

    def start_process(self):
        self.button.setEnabled(False)
        self.process.start('ping', ['-c', '10', 'www.baidu.com'])

    def read_output(self):
        output = self.process.readAll().data().decode()
        self.log.append(output)
        if 'time=' in output:
            progress = int(output.split('time=')[1].split()[0])
            self.progress_bar.setValue(progress)

    def finished(self):
        self.button.setEnabled(True)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    dialog = ProcessDialog()
    dialog.show()
    sys.exit(app.exec_())

上述代码中，使用`ping`命令模拟进程，并通过`readyReadStandardOutput()`信号获取进程的输出。在输出中找到进度信息，并将其更新到`QProgressBar`上。同时，将输出信息显示在`QTextEdit`上。