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QObject::connect( btn, &QPushButton::clicked,this, &MyClass::onClicked );voidMyClass::onClicked(){// How to get pointer to a button:QObject *p =sender();// It's QObject. Now we need to cast it to button:QPushButton *btn =qobject_cast<QPushButon *>( p );Q_ASSERT( btn ...
c++转型:static_cast, const_cast, dynamic_cast, reinterpret_cast C++引入4个新型转型操作符,分别为: 语法为: ***_cast (expression). 下面着重解释四个新型操作符的用途: static_cast: 基本与拥有与C旧式转型相同的威力与意义,以及相同的限制。如: const_cast: 用来改变表达式中的常量性(constness)或易...
if (Shell* helpEvent = qobject_cast<Shell*>(w)) { helpEvent->OnLadderDiagramItemChange(this, sourceType); } } } struct st_Param { int iParamCount; //参数个数 CString strParam[MAX_PARAMCOUNT]; //各参数信息 int iParamType[MAX_PARAMCOUNT]; //参数类型 位 ,字 st_Param() { iParamCoun...
virtual void *qt_metacast(const char *); \ virtual int qt_metacall(QMetaObject::Call, int, void **); \ QT_TR_FUNCTIONS \ private: \ Q_OBJECT_NO_ATTRIBUTES_WARNING \ Q_DECL_HIDDEN_STATIC_METACALL static void qt_static_metacall(QObject *, QMetaObject::Call, int, void **); \ ...
QObject *obj = new QTimer; // QTimer inherits QObject QTimer *timer = qobject_cast<QTimer *>(obj); // timer == (QObject *)obj QAbstractButton *button = qobject_cast<QAbstractButton *>(obj); // button == 0The qobject_cast() function behaves similarly to the standard C++ dynamic...
//qobjectdefs.h#define Q_OBJECT \public: \static const QMetaObject staticMetaObject; \virtual const QMetaObject *metaObject() const; \virtual void *qt_metacast(const char *); \virtual int qt_metacall(QMetaObject::Call, int, void **); \private: \Q_DECL_HIDDEN_STATIC_METACALL static voi...
The qobject_cast() function behaves similarly to the standard C++ dynamic_cast(), with the advantages that it doesn't require RTTI support and it works across dynamic library boundaries. qobject_cast() can also be used in conjunction with interfaces; see the Plug & Paint example for details...
The qobject_cast() function behaves similarly to the standard C++ dynamic_cast(), with the advantages that it doesn't require RTTI support and it works across dynamic library boundaries. qobject_cast() can also be used in conjunction with interfaces; see the Plug & Paint example for details...
Qt 5.2.1 with the support for LSE framebuffer. Contribute to mburakov/qt5 development by creating an account on GitHub.