QMetaObject::invokeMethod()
时间: 2023-11-04 14:04:41 浏览: 120
QMetaObject::invokeMethod()是Qt框架中的一个函数,可以在运行时调用QObject派生类的方法。它的语法如下:
```
bool QMetaObject::invokeMethod(QObject * obj, const char * member, Qt::ConnectionType type, QGenericReturnArgument ret, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8, QGenericArgument val9)
```
其中,第一个参数obj是要调用方法的对象,第二个参数member是要调用的方法名,后面的参数是方法的参数列表。QMetaObject::invokeMethod()函数会返回一个bool值,表示是否调用成功。
该函数常用于在多线程环境中调用QObject派生类的方法,因为QObject派生类的方法只能在它所属的线程中被调用。可以使用invokeMethod()函数来将要调用的方法放到指定的线程中执行。此外,该函数还支持在调用方法时传递参数和返回值。
相关问题
QMetaObject::invokemethod
QMetaObject::invokeMethod is a method provided by the Qt framework that allows you to invoke a method of an object dynamically at runtime, using its name and a set of arguments. This method is particularly useful when dealing with signals and slots, as it allows you to connect signals and slots dynamically, without having to know in advance which methods will be called.
The syntax of the invokeMethod method is as follows:
```C++
bool QMetaObject::invokeMethod(QObject *obj, const char *member, Qt::ConnectionType type, QGenericReturnArgument ret, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8, QGenericArgument val9)
```
Here, `obj` is the object whose method you want to invoke, `member` is the name of the method you want to invoke, and `type` is the type of the signal-slot connection to use. The remaining arguments are the values to pass to the method.
The method returns a boolean value indicating whether the method was successfully invoked or not.
qmetaobject::invokeMethod
这是一个 Qt 框架中的函数,用于在不同的线程之间调用对象的方法。它的原型如下:
```
bool QMetaObject::invokeMethod(QObject *obj, const char *member, Qt::ConnectionType type, QGenericReturnArgument ret, QGenericArgument val0 = QGenericArgument(0), QGenericArgument val1 = QGenericArgument(), QGenericArgument val2 = QGenericArgument(), QGenericArgument val3 = QGenericArgument(), QGenericArgument val4 = QGenericArgument(), QGenericArgument val5 = QGenericArgument(), QGenericArgument val6 = QGenericArgument(), QGenericArgument val7 = QGenericArgument(), QGenericArgument val8 = QGenericArgument(), QGenericArgument val9 = QGenericArgument())
```
其中,`obj` 是被调用的对象,`member` 是对象的某个方法名,`type` 是连接类型,`ret` 是返回值类型,`val0` 到 `val9` 是方法参数。
需要注意的是,这个函数每次执行都会进行一定的开销,所以不要轻易地在循环中使用。
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