我有一个PyQt窗口,该窗口将多个可执行文件作为QProcess调用。在最后一个过程完成后,如何列出每个过程的输出? (类似于process_result = [“ result1”,“ result2”,..])
让我们说它看起来像这样:
for i in list_of_processes:
process = QtCore.QProcess()
process.start(i)
我可以以某种方式使用
process.readyReadStandardOutput()
进行阅读,但这很混乱,因为进程并行运行。 process.waitForFinished()
不起作用,因为GUI将冻结。另外,我检查了有关多线程的以下页面:Multithreading PyQt applications with QThreadPool。另一个问题类似,但也没有帮助我:Pyside: Multiple QProcess output to TextEdit。
最佳答案
一种可能的解决方案是创建一个管理流程的类,并在所有流程按要求完成时发出一个信号。
import sys
from functools import partial
from PyQt4 import QtCore, QtGui
class TaskManager(QtCore.QObject):
resultsChanged = QtCore.pyqtSignal(list)
def __init__(self, parent=None):
QtCore.QObject.__init__(self, parent)
self.results = []
self.m_processes = []
self.number_process_running = 0
def start_process(self, programs):
for i, program in enumerate(programs):
process = QtCore.QProcess(self)
process.readyReadStandardOutput.connect(partial(self.onReadyReadStandardOutput, i))
process.start(program)
self.m_processes.append(process)
self.results.append("")
self.number_process_running += 1
def onReadyReadStandardOutput(self, i):
process = self.sender()
self.results[i] = process.readAllStandardOutput()
self.number_process_running -= 1
if self.number_process_running <= 0:
self.resultsChanged.emit(self.results)
def on_finished(results):
print(results)
QtCore.QCoreApplication.quit()
if __name__ == '__main__':
app = QtCore.QCoreApplication(sys.argv)
manager = TaskManager()
manager.start_process(["ls", "ls"])
manager.resultsChanged.connect(on_finished)
sys.exit(app.exec_())
关于python - PyQt:多个QProcess和输出,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/50930792/