block_by_func

Description:

public void block_by_func (string object_path, string method, MessageCallback callback)

Blocks evoking the callback that matches provided callback and user_data.

Unblock the callback using unblock_by_func.

this	a MessageBus
object_path	the object path
method	the method
callback	the callback to block
user_data	the user_data with which the callback was connected