QObject::connect: 无法排队“QTextCursor"类型的参数

问题描述

我试图从 PyQt 中的非主线程发送信号，但我不知道做错了什么！当我执行程序时，它失败并显示此错误:

Im trying to send a signal from a non-main thread in PyQt but i dont know what am doing wrong! And when i execute the program it fails with this error:

QObject::connect: Cannot queue arguments of type 'QTextCursor'
(Make sure 'QTextCursor' is registered using qRegisterMetaType().)

这是我的代码:

 class Sender(QtCore.QThread):
        def __init__(self,q):
            super(Sender,self).__init__()
            self.q=q
        def run(self):

            while True:
                pass
                try: line = q.get_nowait()
             # or q.get(timeout=.1)
                except Empty:
                    pass
                else:
                   self.emit(QtCore.SIGNAL('tri()'))
 class Workspace(QMainWindow, Ui_MainWindow):
    """ This class is for managing the whole GUI `Workspace'.
        Currently a Workspace is similar to a MainWindow
    """

    def __init__(self):
try:
            from Queue import Queue, Empty
        except ImportError:
            while True:
    #from queue import Queue, Empty  # python 3.x
                print "error"

        ON_POSIX = 'posix' in sys.builtin_module_names

        def enqueue_output(out, queue):
            for line in iter(out.readline, b''):
                queue.put(line)
            out.close()

        p= Popen(["java -Xmx256m -jar bin/HelloWorld.jar"],cwd=r'/home/karen/sphinx4-1.0beta5-src/sphinx4-1.0beta5/',stdout=PIPE, shell=True, bufsize= 4024)
        q = Queue()
        t = threading.Thread(target=enqueue_output, args=(p.stdout, q))
          t.daemon = True # thread dies with the program
        t.start()
        self.sender= Sender(q)
         self.connect(self.sender, QtCore.SIGNAL('tri()'), self.__action_About)
        self.sender.start()

我认为我向线程发送参数的方式是错误的...我需要知道如何将参数发送到线程，在我的情况下，我需要将 q 发送到工作线程.

I think that my way of send parameter to the thread is wrong...I need to know how to send parameters to a thread, in my case i need to send q to the worker thread.

推荐答案

您是否尝试使用 qRegisterMetaType 函数?

Did you try to use qRegisterMetaType function?

官方手册说:

该类用作在 QVariant 和排队的信号和插槽连接.它将类型名称关联到类型，以便它可以在运行时动态创建和销毁.使用 Q_DECLARE_METATYPE() 声明新类型以使其可用于QVariant 和其他基于模板的函数.调用 qRegisterMetaType()使类型可用于非基于模板的函数，例如排队的信号和槽连接.

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