启动时将参数传递给 pyqt 线程 [英] Passing parameter to a pyqt thread when started

问题描述

有没有什么办法可以在线程启动时(.start)给QThread传递一个参数?

Is there any way we can pass a parameter to QThread when the thread is started (.start) ?

我发现了一个在 stackoverflow 中使用 pyqt 线程的示例，但我想知道如何传递参数，以防我希望工作线程处理我传递给它的 run() 函数的数据.

I found an example of using pyqt thread in stackoverflow, but I was wondering how to pass a parameter, in case I want the worker thread to process a data that I pass to its run() function.

我参考的帖子:PyQt 进度条忙指示

代码:

class MyCustomWidget(QtGui.QWidget):

    def __init__(self, parent=None):
        super(MyCustomWidget, self).__init__(parent)
        layout = QtGui.QVBoxLayout(self)       

        self.progressBar = QtGui.QProgressBar(self)
        self.progressBar.setRange(0,100)
        button = QtGui.QPushButton("Start", self)
        layout.addWidget(self.progressBar)
        layout.addWidget(button)

        button.clicked.connect(self.onStart)

        self.myLongTask = TaskThread()
        self.myLongTask.notifyProgress.connect(self.onProgress)


    def onStart(self):
        self.myLongTask.start()

    def onProgress(self, i):
        self.progressBar.setValue(i)


class TaskThread(QtCore.QThread):
    notifyProgress = QtCore.pyqtSignal(int)
    def run(self):
        for i in range(101):
            self.notifyProgress.emit(i)
            time.sleep(0.1)

我想在调用 .start 时传递一个变量，例如

I want to pass a variable when calling .start such as

self.myLongTask.start(myvar)
.
.
def run(self, myvar):

当然，pyqt 不允许这样做.

but of course, pyqt does not allow that.

推荐答案

您不能将参数传递给 run 但您可以像这样将参数传递给它的构造函数:

You can not pass argument to run but you can pass argument to it's constructor like this:

class TaskThread(QtCore.QThread):
    notifyProgress = QtCore.pyqtSignal(int)
    def __init__(self, myvar, parent=None):
        QThread.__init__(self, parent)
        self.myvar = myvar
    def run(self):
        #use self.myvar in your run 
        for i in range(101):
            self.notifyProgress.emit(i)
            time.sleep(0.1)

在 MyCustomWidget 类中:

class MyCustomWidget(QtGui.QWidget):

    def __init__(self, parent=None):
        super(MyCustomWidget, self).__init__(parent)
        layout = QtGui.QVBoxLayout(self)       

        self.progressBar = QtGui.QProgressBar(self)
        self.progressBar.setRange(0,100)
        button = QtGui.QPushButton("Start", self)
        layout.addWidget(self.progressBar)
        layout.addWidget(button)

        button.clicked.connect(self.onStart)
        ##############################################################
        #and pass your argumetn to it's constructor here
        self.myLongTask = TaskThread(myvar=myargument)
        ##############################################################
        self.myLongTask.notifyProgress.connect(self.onProgress)


    def onStart(self):
        self.myLongTask.start()

    def onProgress(self, i):
        self.progressBar.setValue(i)

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