我正在使用kivy编写一个应用程序,以检查USB设备是否已连接,而无需重新启动我的应用程序,根据文档,我正在使用时钟在特定时间间隔频繁调用所需的方法。但是,这总是表示以下错误:
from __future__ import print_function
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.button import Button
from kivy.clock import Clock
import wmi
kv = """<KartScan@Screen>:
orientation: 'horizontal'
name: 'introscreen'
canvas.before:
Rectangle:
pos: self.pos
size: self.size
source: 'index.png'
AnchorLayout:
anchor_x: 'center'
anchor_y: 'center'
BoxLayout:
orientation:'horizontal'
size_hint: .5, .1
canvas:
Color:
rgb: 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
spacing: 20
pos_hint: {'center_x':.8, 'center_y': .8}
AnchorLayout:
anchor_x: 'left'
size_hint_x: .5
Button:
id: statebtn
size_hint: None, None
height: 50
width: self.texture_size[0]
padding: 10, 10
text: app.getusbdevices()"""
Builder.load_string(kv)
statebtn = Button(text="INSTRUMENT_NOT_FOUND")
class KartScan(FloatLayout):
def __init__(self, **kwargs):
super(KartScan, self).__init__(**kwargs)
class KartScanApp(App):
def build(self):
k = KartScan()
Clock.schedule_interval(self.getusbdevices, 2)
return k
def getusbdevices(self):
c = wmi.WMI()
statebtn.text = u"INSTRUMENT_NOT_FOUND"
wql = "Select * From Win32_USBControllerDevice"
for item in c.query(wql):
if "USB Device" in item.Dependent.Caption:
statebtn.text = u"CONNECTED"
else:
statebtn.text = u"INSTRUMENT_NOT_FOUND"
return statebtn.text
if __name__ == '__main__':
KartScanApp().run()
以上是我的代码:有人能帮我解决这个问题吗?
这是我要的日志
基维_时钟CyClockBase_处理事件(kivy\u clock.c:7700)文件“kivy\u clock.pyx”,第397行,在kivy中_时钟CyClockBase_处理事件(kivy\u clock.c:7577)文件“kivy\u clock.pyx”,第395行,在kivy中_时钟CyClockBase_处理事件(kivy\u clock.c:7498)文件“kivy\u clock.pyx”,第167行,在kivy中_时钟时钟事件。tick(kivy_clock.c:3490)TypeError:getusbdevices()正好接受1个参数(给定2个)
