Bus.connectMessage

gulong connectMessage(T)(string detail =  null,  T callback,  Flag!"After" after =  No.After) if (isCallable!T
    &&  is(ReturnType!T ==  void)
   && (Parameters!T.length <  1 || (ParameterStorageClassTuple!T[0]  ==  ParameterStorageClass.none &&  is(Parameters!T[0]  ==  gst.message.Message)))
   && (Parameters!T.length <  2 || (ParameterStorageClassTuple!T[1]  ==  ParameterStorageClass.none &&  is(Parameters!T[1] :  gst.bus.Bus)))
   &&  Parameters!T.length <  3)

Connect to Message signal.

A message has been posted on the bus. This signal is emitted from a #GSource added to the mainloop. this signal will only be emitted when there is a #GMainLoop running.

Parameters

`detail`	Signal detail or null (default)
`callback`	signal callback delegate or function to connect `void callback(gst.message.Message message, gst.bus.Bus bus)` `message` the message that has been posted asynchronously (optional) `bus` the instance the signal is connected to (optional)
`after`	Yes.After to execute callback after default handler, No.After to execute before (default)

Returns

Signal ID