Stack Overflow
Stack Overflow

Questions tagged [qt-slot]

53 questions
2
votes
0 answers

QUdpSocket connect to readyRead no effect after disconnecting

I'm trying to create an UDPLogger. When I connect the first time to readyRead I get data over UDP. connect(m_socket, &QUdpSocket::readyRead, this, &UDP::readData); when I stop to get the signal readyRead with disconnect which works fine and…
Murmi
  • 91
  • 10
2
votes
0 answers

Google mock for qabstractsocket class

I'm trying to solve my unit testing problem. I have a class with a QTcpSocket object in it. This class has derived from the QObject to use the signal/slot system and the socket object is used inside slots. I have tried to mock (gmock) this socket…
Олег Юрченко
  • 49
  • 3
2
votes
1 answer

AttributeError: 'builtin_function_or_method' object has no attribute 'connect'

I am using PyQt based on PyQt4. I am using PyCharm 2017.3. My python version is 3.4. I am trying to connect the signal that we get when we click mouse to capture content from a QLineEdit. class HelloWorld(QMainWindow, tD_ui.Ui_MainWindow): #…
royatirek
  • 2,437
  • 2
  • 20
  • 34
2
votes
1 answer

Qt signal on buttongroup not connected

I have a buttongroup defined with two radiobuttons buttonGroupFFTDimension = new QButtonGroup(this); buttonGroupFFTDimension->addButton(ui->radioButton1D, 1); buttonGroupFFTDimension->addButton(ui->radioButton2D,…
Matthias Pospiech
  • 3,130
  • 18
  • 55
  • 76
2
votes
1 answer

QT signal and slot not working giving an error message

I am new to Qt and trying to write signal and slot. Below is the code I was trying to run. with SLOT and SIGNAL keywords on "connect" function, it works fine. But I do not want to use SIGNAL and SLOT keywords on connect function, instead want to use…
LilRazi
  • 690
  • 12
  • 33
2
votes
1 answer

A warning message "No matching signal for" when executing my application

When executing my application some warning messages appear: QMetaObject::connectSlotsByName: No matching signal for on_actionUndo_triggered(), QMetaObject::connectSlotsByName: No matching signal for on_actionRedo_triggered() I have implemented the…
Lion King
  • 32,851
  • 25
  • 81
  • 143
2
votes
3 answers

Qt: How to know if slot was called by signal-slot mechanism by calling the signal like a function

Inside a slot I check the QObject::sender() but now I want to call this slot directly like a function. Can I know how this slot was called inside of the slot? Either by signal-slot mechanism or simply by calling the slot like a function?
kakush
  • 3,334
  • 14
  • 47
  • 68
1
vote
1 answer

Qt QObject::connect receiver and slot of different classes

I have two classes: first one is the main QMainWindow class, and the second one is my custom class. For example, I want to make a connection in the constructor of my custom class where when I press a TestButton (which is a part of the ui of main…
Powarito
  • 67
  • 4
1
vote
1 answer

Problem with PyQt5 signals emitted from other classes

In the example below I want to send a signal from A to Main and from B to Main. Receiving the signal from A is OK, but B does not work. The tricky part is that the "calculations" in B must be triggered from A, not from Main. Will appreciate any…
user12209348
  • 11
  • 3
1
vote
1 answer

Why can't you use a generator function as a slot?

I'm trying to iterate through a list in a PySide2 application. So each time a "Next" button is pressed, the next item is returned from the list and displayed. I could keep track of the index of the entry in my list which was most recently read and…
James Dorsey
  • 25
  • 5
1
vote
1 answer

QT looking for slot in wrong class

I have a separate class for making a GET request with QNetwork shown below. Reqest header: #ifndef REQUEST_H #define REQUEST_H #include #include class Request : public QObject { Q_OBJECT public: void make_request(QUrl…
HackNode
  • 159
  • 2
  • 11
1
vote
1 answer

Cant assign a variable through connect method in pyqt

When trying to connect a button press to the assignment of a variable, PyCharm refuses to accept the syntax, stating Can't assign to function call with red syntax underlining. Here is the following code: self.button.clicked.connect(lambda :…
e15purple
  • 29
  • 7
1
vote
1 answer

Can I use global slots?

Can I use global slots in Qt? I am trying to use this code, but it seems like it doesn't work. slots void f(int i); void connect(QSpinBox *spinBox) { QObject::connect(spinBox, SIGNAL(valueChanged(int)), NULL, SLOT(f(int))); } void f(int i) { …
Ufx
  • 2,595
  • 12
  • 44
  • 83
1
vote
1 answer

Slot as method of a locally instantiated class is never called

I have a list of mp3 files that I'm trying to play through pygame whenever different buttons are pressed (one file per button). Since there is a variable number of those files, I'm simply implementing a for loop, and I have an AudioPlayer class that…
pie3636
  • 795
  • 17
  • 31
1
vote
2 answers

Use of QAbstractSocket stateChanged()-Signal

What is the correct use/implementation of the QAbstractSocket stateChanged()-Signal? main.cpp: #include #include #include int main(int argc, char *argv[]){ QCoreApplication a(argc,…
Papierschnellboot
  • 45
  • 1
  • 6
1
2
3 4