如何在PyQt中设置按键到键盘的中断

Question

通过终端运行程序时，我们可以通过按下"Ctrl+c"来停止程序，它将显示消息"KeyboardInterrupt"。那么，有没有什么方法可以通过点击PyQt中的按钮来做正确的事情呢。

Answer 1

如果您的程序正在运行循环，您可以定期调用processEvents以允许gui有时间更新（这应该允许您单击按钮关闭应用程序）：

    count = 0
    while True:
         count += 1
         if not count % 50:
             QtGui.qApp.processEvents()
         # do stuff...

Answer 2

在我的脚本中，为了中断一个无限循环，我还使用了QtGui.qApp.processEvents()，结果很好。无限循环从串行端口写入和读取数据，用户可以通过按钮（1.条件）中断循环

def Move_Right(self):
    # move the slide right
    cmdPack = struct.pack(cmdStruct, Address, Rotate_Right, 0, Motor5, Speed5)
    dataByte = bytearray(cmdPack)
    checksumInt = sum(dataByte[:]) % 256
    msgPack = struct.pack(msgStruct, Address, Rotate_Right, 0, Motor5, Speed5, checksumInt)
    ser0.flushOutput() # Clear output buffer
    ser0.write(msgPack)
    # read the switch status
    cmdPack = struct.pack(cmdStruct, Address, Command.GAP, 10, Motor5, 0)
    dataByte = bytearray(cmdPack)
    checksumInt = sum(dataByte[:]) % 256
    msgPack = struct.pack(msgStruct, Address, Command.GAP, 10, Motor5, 0, checksumInt)
    ser0.flushOutput() # Clear output buffer
    # check the switch status with an infinite write/read loop with two break out conditions
    while True: 
        QtGui.qApp.processEvents()  # 1. condition: interrupt with push button
        ser0.write(msgPack)
        reply = ser0.read(9)
        answer = struct.unpack('>BBBBlB', reply)
        value = answer[4]
        command = answer[3]
        if (command == 6) and (value == 1):     # 2. condition: interrupt with limit switch
            print 'end of line'
            Stop_Motor5()
            break