PyQt5 和 subprocess.Popen(...)

Question

我有 3 节课

一个是Console 类：

class Console(QWidget):
    def __init__(self):
        super().__init__()
        self.editor = QPlainTextEdit(self)
        self.editor.setReadOnly(True)
        self.font = QFont()
        self.font.setFamily(editor["editorFont"])
        self.font.setPointSize(12)
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.editor, 1)
        self.setLayout(self.layout)
        self.output = None
        self.error = None
        self.editor.setFont(self.font)

    def run(self, command):
        """Executes a system command."""

        out, err = subprocess.Popen(command, shell=True,    stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        self.output = out
        self.error = err
        self.editor.setPlainText((self.output + self.error).decode())
        return self.output + self.error

另一个是Tabs 类，它将Console() 分配给变量self.console。

然后我有 Main 类，它有一个名为 Terminal 的函数，可以通过键盘快捷键 Shift+F10 调用

这将获取打开文件的当前文件名（由Tabs 类处理）并使用subprocess 运行它。

现在我们遇到了问题：当运行一些不是即时的程序时，整个 GUI 冻结，当Console 类执行 run 函数时，我不知道如何使 GUI 响应.

完整的代码可以在这里找到：https://github.com/Fuchsiaff/PyPad

Answer 1

你不使用subprocess.Popen()，因为它是阻塞的，阻塞任务的缺点之一是它们不允许GUI执行其他工作，因为这个Qt提供了不阻塞的QProcess类事件循环：

import sys

from PyQt5 import QtCore, QtGui, QtWidgets

class Console(QtWidgets.QWidget):
    errorSignal = QtCore.pyqtSignal(str) 
    outputSignal = QtCore.pyqtSignal(str)
    def __init__(self):
        super().__init__()
        self.editor = QtWidgets.QPlainTextEdit(self)
        self.editor.setReadOnly(True)
        self.font = QtGui.QFont()
        # self.font.setFamily(editor["editorFont"])
        self.font.setPointSize(12)
        self.layout = QtWidgets.QVBoxLayout()
        self.layout.addWidget(self.editor, 1)
        self.setLayout(self.layout)
        self.output = None
        self.error = None
        self.editor.setFont(self.font)
        self.process = QtCore.QProcess()
        self.process.readyReadStandardError.connect(self.onReadyReadStandardError)
        self.process.readyReadStandardOutput.connect(self.onReadyReadStandardOutput)

    def onReadyReadStandardError(self):
        error = self.process.readAllStandardError().data().decode()
        self.editor.appendPlainText(error)
        self.errorSignal.emit(error)

    def onReadyReadStandardOutput(self):
        result = self.process.readAllStandardOutput().data().decode()
        self.editor.appendPlainText(result)
        self.outputSignal.emit(result)


    def run(self, command):
        """Executes a system command."""
        # clear previous text
        self.editor.clear()
        self.process.start(command)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = Console()
    w.show()
    w.errorSignal.connect(lambda error: print(error))
    w.outputSignal.connect(lambda output: print(output))
    w.run("ping 8.8.8.8 -c 100")
    sys.exit(app.exec_())

Answer 2

使用python内置的线程模块。

然后做：

import threading

将其用作：

def run(self, command):
    """Executes a system command."""

    tt = threading.Threading( target = self._sub_thread )
    tt.start()

def _sub_thread(self):
    out, err = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE).communicate()
    self.output = out
    self.error = err
    self.editor.setPlainText((self.output + self.error).decode())

这是语用学