qt-signals

I have been trying to find a way to update the GUI thread from a Python thread outside of main. The PyQt5 docs on sourceforge have good instructions on how to do this. But I still can't get things to work. Is there a good way to explain the following output from an interactive session? Shouldn't there be a way to call the emit method on these objects? >>> from PyQt5.QtCore import QObject, pyqtSignal >>> obj = QObject() >>> sig = pyqtSignal() >>> obj.emit(sig) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'QObject' object has no attribute 'emit' and >>>

There are discrepancies between respected answers here on SO and the actual Qt docs. I've read this question and I want some further clarification. Can anyone confirm: A signal is always protected , therefore it can be emitted only by the class or any of its subclasses. I'm not sure this is true; the question above shows answers supporting this statement. But the Qt docs say: Signals are public access functions and can be emitted from anywhere, but we recommend to only emit them from the class that defines the signal and its subclasses. So which is it? Slots are just functions, and thus may be

Can Qt signals be public or private? Can I create internal signals, which are seen only inside the class? Update: I have a class with some internal signals. How can I make those signals invisible for other classes (encapsulation & information hiding)? Andrei Vlasyuk No. Signals cannot be public or private. Qt signals are protected class methods. "signals" keyword is defined in qobjectdefs.h (line 69 as for Qt 4.6.1): # define signals protected UPDATE: signals are only protected upto and including all minor versions of Qt 4. From Qt 5.0 onwards they are public . See https://stackoverflow.com/a

I am working on an application which uploads the content of the file to server. To upload the file to server I am using ‘QNetworkAccessManager’ class. Since it works as asynchronous way, I changed it to work as synchronous way by using QEventLoop. Class FileTransfer { Public : QNetworkAccessManager mNetworkManager; Void Upload(QNetworkRequest request, QIODevice *data) { responce = mNetworkManager.put(request, data); EventLoop.exec(); ReadResponce(responce); } Void Stop() { responce ->close(); } } In my sample application I have 2 windows. 1st to select the files and 2nd to show the progress.

I checked other similar questions and tried their solutions but they don't work for me. I'm basically trying to make a http client that only makes post requests. In order to do this, I need to connect QNetworkManager 's finished signal to some callback slot. Here's my code. h file : ... public slots: void finishedSlot(QNetworkReply* reply); private: QNetworkAccessManager *network_manager; ... cpp file : ... Class1::Class1(){ network_manager = new QNetworkAccessManager(this); QObject::connect(network_manager, SIGNAL(finished(QNetworkReply *)), this, SLOT(finishedSlot(QNetworkReply *))); } ...