Mastering GUI Programming with Python

The POSTing backend

Our web posting backend will be based on a QObject simply so that we can use signals and slots.

Begin by subclassing QObject and creating a signal:

class Poster(qtc.QObject):    replyReceived = qtc.pyqtSignal(str)

The replyReceived will be emitted when we receive a reply from the server to which we're posting and will carry with it the body of the reply as a string.

Now let's create the constructor:

    def __init__(self):        super().__init__()        self.nam = qtn.QNetworkAccessManager()        self.nam.finished.connect(self.on_reply)

Here, we're creating our QNetworkAccessManager object and connecting its finished signal to a local method called on_reply().

The on_reply() method will look like this:

    def on_reply(self, reply): reply_bytes ...