Slots and signals are identified by their names (when you do use SLOT(set_pwm(unsigned long)) in your code, you are constructing a string). You can simply store the name and the object and then call the slot using QMetaObject.. You can use pointers to member functions in C++ (see the C++ faq), but in this case I'd suggest to use Qt's meta object system. Best practice for passing pointers as sender for async signals Im new to Qt and dont really unterstand the behaviour of Qt's smart pointers. I read the documentation, searched for examples which fit my needs and experimented with QScoped and QSharedPointer, but couldn't find a fullfilling solution for me. ... Best practice for passing pointers as sender for async signals Best practice for passing pointers ... QSharedPointer through signals / slots | Qt Forum I personally do not use smart pointers in the signal/slot communication so I don't know it. You already have a test to answer your question. Add a debug output to the destructor of Data to see when it gets deleted. Add debug output to test() function befo...
signal slot free download - SourceForge
Getting the most of signal/slot connections. ... it needs a pointer to it, ... that you can’t put QObjects in containers or smart pointers. Often the alternatives ... Implementing my own signal slot mechanism using C++11 I programmed in C# and I used the Qt framework. Both of them have their own signal slot mechanism which are really powerful. I looked at several implementations in C++ and based on what I learnt from Guarded Pointers in Qt 3 and Qt 4 Qt 4's QPointer class provides the same functionality as Qt 3's QGuardedPtr, but with much less overhead. A QPointer still requires one signal--slot connection, but the only other overhead is a single pointer. Internally, Qt achieves this by using a special kind of signal--slot connection, where the target object is a QPointer instead of a QObject.
Implementing my own signal slot mechanism using C++11
How Qt Signals and Slots Work - Woboq Qt is well known for its signals and slots mechanism. But how does it work? In this blog post, we will explore the internals of QObject and QMetaObject and discover how signals and slot work under the hood. In this blog article, I show portions of Qt5 code, sometimes edited for formatting and brevity. Why Doesn't Qt Use Templates for Signals and Slots? | Qt 4.8 The syntax used for Qt's signals and slots has proved very successful in practice. The syntax is intuitive, simple to use and easy to read. People learning Qt find the syntax helps them understand and utilize the signals and slots concept -- despite its highly abstract and generic nature. Implementing my own signal slot mechanism using C++11
Im new to Qt and dont really unterstand the behaviour of Qt's smart pointers. I read the documentation, searched for examples which fit my needs and experimented with QScoped and QSharedPointer, but couldn't find a fullfilling solution for me. ... Best practice for passing pointers as sender for async signals Best practice for passing pointers ...
signal slot free download - SourceForge This project provides a generator for conneting the YAKINDU Statecharttools with a Qt application. Since the concept of incoming and outgoing events is similar to the Qt signal and slot concept it is logical to link both together. Note that the generated code is an Addon onto the already generated C++-Code from SCT.
Slots and signals are identified by their names (when you do use SLOT(set_pwm(unsigned long)) in your code, you are constructing a string). You can simply store the name and the object and then call the slot using QMetaObject.. You can use pointers to member functions in C++ (see the C++ faq), but in this case I'd suggest to use Qt's meta object system.
[Solved] Problem with signal/slot carrying pointer - qt ... I have class A, which dynamically allocates an instance of class B when a method is called, and emits a signal which carries the instance of B. In another class named handler, I have a slot which recives an object of type B. And in the main function, I connect them like this: connect(a, SIGNAL(changed(B*)), handler, SLOT(process(B*))); c++ - Qt is it possible to define a function pointer in ... The connect and disconnect code for all the signals will be the same, as is the slot handler that the signals connect to. Instead of writing this code over and over. I would like to use a function pointer or something similar to assign to the signal, then have a common code block which performs the connection or disconnection.
It should be noted that, while the pointer value can be accessed in this manner, QSharedPointer and QWeakPointer provide no guarantee about the object being pointed to. Thread-safety and reentrancy rules for that object still apply. Other Pointer Classes. Qt also provides two other pointer wrapper classes: QPointer and QSharedDataPointer. They ...