c++ - 使用 QtGstreamer 在 connect() 上编译错误

Question

我正在尝试查看通过 QtGstreamer管道的消息。

这是有问题的代码：

//pipeline is of type: QGst::PipelinePtr
pipeline->bus()->enableSyncMessageEmission(); 

QGlib::connect(pipeline->bus(), "sync-message", this, &MyClass::_msg_handler);

但 QtCreator 抱怨connect()：

/usr/include/QtGStreamer/QGlib/connectimpl.h:-1: In function 
‘bool QGlib::connect(void*, const char*, T*, R (T::*)(A0), QGlib::ConnectFlags) 
[with T = MyClass, R = void, A0 = const QGlib::RefPointer<QGst::Message>&, 
QGlib::ConnectFlags = QFlags<QGlib::ConnectFlag>]’:

/usr/include/QtGStreamer/QGlib/connectimpl.h:330: error: invalid initialization
of reference of type ‘const QGlib::Private::DestroyNotifierIfacePtr&’ from 
expression of type ‘QGlib::Private::GetDestroyNotifier<MyClass, void>’

/usr/include/QtGStreamer/QGlib/connect.h:259: error: in passing argument 5 of 
‘ulong QGlib::Private::connect(void*, const char*, QGlib::Quark, void*, const
QGlib::Private::DestroyNotifierIfacePtr&, uint, QGlib::Private::ClosureDataBase*, 
QGlib::ConnectFlags)’

可能是什么原因？

Answer 1

解决了。

在我的例子中，指定的回调connect()是我写的一个类的方法，所以问题是MyClass需要继承自QObject：

class MasterSink : public QObject
{
   // ...
}