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QT新手问题,QObject::connect无用。
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QMetaObject::Connection QObject::connect(const QObject * sender, const char * signal, const QObject * receiver, const char * method, Qt::ConnectionType type = Qt::AutoConnection) [static] When you are not connecting inside a QObject subclass, you will need to use the scoped variant, respectively, because you will not have an object in place to ...
QObject::connect: No such slot QObject::qmlSignal(QString) in ..\Shishatisch\main.cpp:18. I searched for a sollution for this problem and it turned out that some other guys have that problem, too. The solution always was to name all functions the same way. But mine are since the beginning.
文章浏览阅读6.3w次,点赞18次,收藏111次。本文章主要总结Qt5.9中QObject::connect()函数的用法,全文分为两大部分,第一部分讲解connect函数使用的前提条件,第二部分讲解connect函数各个参数详解和具体的用法实例。一、首先需要注意的是,connect()函数有且只能在QObject类里面和QObject派生类里面使用 ...
Detailed Description. QObject is the heart of the Qt Object Model.The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots.You can connect a signal to a slot with connect() and destroy the connection with disconnect(). To avoid never ending notification loops you can temporarily block signals with blockSignals().
1:首先要链接的两个类必须继承于QObject,同时添加 Q_OBJECT。2:在qt中QObject::connect中填写的signal和slot函数,一定要填写参数类型。因为类中的函数可以,也就是,重载函数名一样,参数不一样,如果QObject::connect中的函数没有参数类型,则无法正确连接。3:QObject::conn...
文章浏览阅读2.6k次。QT程序中的事件机制是通过SIGNAL-SLOT(信号-槽)来实现的,创建一个信号与槽的连接就是使用connect方法,它是QObject类下面的一个静态方法。在非QObject派生类中使用connect方法需要指定QObject类,即使用QObject::connect()。环境IDE:Qt creator 4.11.0编译器:MinGW 5.3.0 32bit for C++问题在非QObject ...
我是Qt的新手。大多数时候,Qt开发人员需要使用信号和插槽进行对象通信。到目前为止,我已经看到了两种连接信号和插槽的方法。1)QObject::connect(scrollBar, SIGNAL(valueChanged(int)),label, SLOT(setNum(int)));2)connect(scrollBar, SIGNAL(valueChanged(int)),label, S
不,这是正确的。您可以这样做,因为 . durationChanged() 是 this 中的一个槽,因此您可以调用 connect() 的 成员函数版本:. QMetaObject::Connection QObject::connect(const QObject * sender, const char * signal, const char * method, Qt::ConnectionType type = Qt::AutoConnection) const
我试图将来自mainwindow()对象内的QProcess的信号连接到mainwindow()对象内的另一个基于QObject的类,但得到以下错误:QObject::connect: Cannot connect (null)::readyReadStandardOutput to (null)::logReady()这是代码,它无论如何都不完整,但我不知道为什么它不能工作。exeProc
文章浏览阅读3k次。一:connect()函数有且只能在QObject类里面和QObject派生类里面使用connect()函数有且只能在QObject类里面和QObject派生类里面使用,自己新建的类里面(基类不是QObject类和其QObject派生类)使用connect()函数是无效的,编译时一直报错。当然,我们新建工程比如widget,mainwindow,dialog都是 ...