Mastering GUI Programming with Python

Creating the thread pool

The final piece of this application will be a HashManager object. The job of this object is to take the form output, locate the files to be hashed, and then start up a HashRunner object for each file.

It will begin like this:

class HashManager(qtc.QObject):    finished = qtc.pyqtSignal()    def __init__(self):        super().__init__()        self.pool = qtc.QThreadPool.globalInstance()

We've based the class on QObject so that we can define a finished signal. This signal will be emitted when all of the runners have completed their tasks.

In the constructor, we're creating our QThreadPool object. Rather than creating a new object, however, we're using the globalInstance() static method to access the global thread pool object that already ...