QThread不并行运行

Question

我有一个“预处理”功能，可能需要花费一些时间才能执行。因此，我希望它与我的UI同时运行。我尝试使用QThread进行此操作：

class Preprocessor(QThread):
    done = pyqtSignal(ndarray)
    
    def __init__(self, image):
        super(Preprocessor, self).__init__()
        self.image = image
        
    def run(self) -> None:
        result = preprocess(self.image)
        self.done.emit(result)

然后运行：

preprocessor = Preprocessor(image)
preprocessor.start()
preprocessor.done.connect(self.handler_function)

但是现在当我按下UI中的按钮时，它仍然只运行我的预处理程序并阻止UI响应。我无法更改有关预处理程序代码的任何内容。

Answer 1

尝试：

import sys
from PyQt5.Qt import *

class Preprocessor(QThread):
    done = pyqtSignal(object)                 # ndarray

    def __init__(self, image):
        super(Preprocessor, self).__init__()
        self.image = image

    def run(self) -> None:
        result = self.preprocess(self.image)
        self.done.emit(result)

    def preprocess(self, image):        
        while image:
            self.done.emit(image)    #(result)
            image -= 1
            self.msleep(100)            
        return "The End"

class ExampleApp(QMainWindow):
    def __init__(self):
        super().__init__()        

        image = 100
        self.preprocessor = Preprocessor(image)                   # self. +++
        self.preprocessor.done.connect(self.handler_function)     # +
        self.preprocessor.start()                                 #
#        preprocessor.done.connect(self.handler_function)

    def handler_function(self, obj):
        print(obj)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = ExampleApp()
    window.show()
    app.exec_()