我想将一个字符串变量从Main_Window
类传递给PyQt中的另一个QDialog
类。我无法理解我做错了什么。我想将host_mac
变量从Main Class传递给QDialog Class。这是我的代码的主要部分。
这是QDialog类:
class Client(QDialog):
def __init__(self, parent=None):
super(Client, self).__init__(parent)
self.pb = QPushButton()
self.pb.setObjectName("connect")
self.pb.setText("Connect")
layout = QFormLayout()
layout.addWidget(self.pb)
self.setLayout(layout)
self.connect(self.pb, SIGNAL("clicked()"),self.set_client)
self.setWindowTitle("Learning")
def set_client(self):
self.client = self.le.text()
print 'provided client mac is ' + self.client + 'and host_mac is ' + Main_window_ex.host_mac
这里是Main_Window类:
class Main_window_ex(QMainWindow, Ui_Main_window):
def __init__(self, parent = None):
"""
Default Constructor. It can receive a top window as parent.
"""
QMainWindow.__init__(self, parent)
self.setupUi(self)
self.host_mac = 'blah blah'
#more code beneeth
但是我收到以下错误:
AttributeError: type object 'Main_window_ex' has no attribute 'host_mac'
答案 0 :(得分:2)
Main_window_ex.host_mac
指的是类变量(因为Main_window_ex
只是一个类),但您想要访问实例变量。换句话说,在实例化类之前,不会定义host_mac
。
有几种方法可以解决这个问题。假设Main_window_ex
负责创建Client
,那么一种简单的方法是将变量传递给Client
:
class Client(QDialog):
def __init__(self, host_mac, parent=None):
self.host_mac = host_mac
...
并使用它:
def set_client(self):
self.client = self.le.text()
print 'provided client mac is ' + self.client + 'and host_mac is ' + self.host_mac
作为旁注,您可能希望使用新的样式连接语法:
# old style
# self.connect(self.pb, SIGNAL("clicked()"),self.set_client)
# new style
self.pb.clicked.connect(self.set_client)