Signals and slots between classes, qt connection type

Signals and slots between classes

 

Signals and slots between classes

 

Signals and slots between classes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signals and slots between classes

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Qt connection type

Only the classes that inherit from qobject can have signals, in addition they must have the macro q_object, since this through the moc creates all the necessary metaclass for the connection between signals and slots. ) would cause the signal-slot-connection to be created each time you call the function. So it'll be better to create the connection elsewhere. Secondly, you have used the new style signal-slots, good for you, but the connection is erroneous. You have the line self. In the first case you will have to "let a know b ", meaning that a has a reference to b. In this case you don't even have to do signals & slots at all but you can simply call b 's methods directly. Yes, create a method in object b that's tied to a signal in object a. Note how connect is called (this is just an example): self. Signal ("clicked ()"), self, qtcore. Slot ("accept ()")) the third argument is the object with the slot, and the fourth the slot name. Python signals and slots between classes. But the following code does not work. If i want connect signal of qserialport with slot (which is part of second class), i had to create a object from qserialport in the constructor of usb2can_driver. This object to allow use signal/slot mechanism. So in short: usb2can_driver:: was replaced by object port_usb2can for the connection in the second class (canview), i used this syntax: Saturday, directions, but for you can make it anyways, signals and slots between classes.

Signals and slots between classes
Signals and slots between classes
Signals and slots between classes

 

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Qt slot sender, signal connection program

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I think you can use this method: [protected] int qobject:: sendersignalindex () const. Returns the meta-method index of the signal that called the currently executing slot, which is a member of the class returned by sender (). If called outside of a slot activated by a signal, -1 is returned. You can check the sender() in both cases. In case of the slot being called via a signal/slot mechanism the sender will return a pointer while when called as a method it will return null pointer. Simple example: class test : public qobject { q_object signals: void signal(); public slots: void slot() { qdebug() << sender(); } }; and the use:. A slot is a piece of code, it doesn't "live" in a thread – a thread might run it or not, but the code itself doesn't belong to any thread. (if the slot is a member function, then the qt object defined as the receiver belongs to a qt thread – that's a property of the object, not the function. – 사용자의 요구에 응답하는 이 코드. – 특정 시그널과 연결되어서 사용자의 요구를 처리하는 역할. – qobject::connect () 함수를 사용. Connect ( _foobarbutton, signal (clicked ()), this, slot (buttonpressedslot ()) ); } void mainwindow::buttonpressedslot () { // e. You can check the sender() in both cases. In case of the slot being called via a signal/slot mechanism the sender will return a pointer while when called as a method it will return null pointer. Simple example: class test : public qobject { q_object signals: void signal(); public slots: void slot() { qdebug() << sender(); } }; and the use:

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Qt slots not executed in a multi-threaded dll. I am developing a dll that is to be loaded dynamically. In this dll i need to use some qt networking components, like qlocalserver and qnetworkaccessmanager. To use those, i need to have a qt event loop running. The slot is a member of a subclass of qobject, thus it has also a qobject::sender() member. Just call sender(), and you will be given a qobject* pointing to your action. After that you can use objectname() or property() of an acquired action to collect more information. The q_object macro must appear in the private section of a class definition that declares its own signals and slots or that uses other services provided by qt's meta-object system. Note: this macro requires the class to be a subclass of qobject. It allows parameterless signals from multiple senders to connect to one slot. Connect ( _foobarbutton, signal (clicked ()), this, slot (buttonpressedslot ()) ); } void mainwindow::buttonpressedslot () { // e. That works so far ! now i have e. A button in the sub window, and it should trigger a function that affects an element in the main window (e. Show a text in a "plaintextedit" element besides the mdi area). In the qt-designer i can define the signal and a self-defined slot

Signals and slots between classes, qt connection type

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