問題描述

我正在開發 Kivy 應用程序.

I'm working on Kivy app.

因為我想從藍牙適配器獲取數據，所以我使用了下面的代碼.

Since I want to get data from bluetooth adapter, I used code below.

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.scatter import Scatter
from kivy.properties import ObjectProperty,NumericProperty
from kivy.clock import Clock
from kivy.lang import Builder
from jnius import cast,autoclass
from kivy.logger import Logger

BluetoothAdapter = autoclass('android.bluetooth.BluetoothAdapter')
bufferedreader = autoclass('android.bluetooth.BluetoothAdapter')
BluetoothDevice = autoclass('android.bluetooth.BluetoothDevice')
BluetoothSocket = autoclass('android.bluetooth.BluetoothSocket')
InputStreamReader = autoclass('java.io.InputStreamReader')
BufferedReader = autoclass('java.io.BufferedReader')
UUID = autoclass('java.util.UUID')
StringBuilder = autoclass('java.lang.StringBuilder')

Builder.load_string('''
<bluetooth>:
    Button:
        pos:root.width/3,root.height/2
        text: root.data
        size: (300,100)


''')

class bluetooth(Scatter):
    socket = ObjectProperty(None,allownone = True)
    data = ObjectProperty('getting data',allownone = True)
    recv = ObjectProperty(None,allownone = True)
    counter = NumericProperty(0)

    def change_data(self,dt):
        Logger.info('Im in the change_data!!')
        self.data = 'change_data'
        paired_devices = BluetoothAdapter.getDefaultAdapter().getBondedDevices().toArray()
        for device in paired_devices:
            self.data = str(device.getName())
            Logger.info('Im in the loop!!'+str(device))
            if device.getName() == 'HC-06':

                self.socket = device.createRfcommSocketToServiceRecord(UUID.fromString('00001101-0000-1000-8000-00805F9B34FB'))
                bufferedreader = BufferedReader(InputStreamReader(self.socket.getInputStream(),"UTF-8"))

                StringBuilder.append(bufferedreader.read())
                self.data = StringBuilder.toString()

        #if self.socket == None:
        #   pass
        #else:
        #   self.socket.connect()
class myApp(App):
    def build(self):
        bt = bluetooth()
        Clock.schedule_interval(bt.change_data,1)
        return bt
myApp().run()

也許我錯過了一些代碼..我不知道如何將 bluetooth.socket 輸入流轉換為 python 字符串.有人可以幫忙嗎?

Maybe I missed some code.. I can't find out how to get bluetooth.socket inputstream to python string. Can someone please help?

推薦答案

我終于找到了一個似乎可行的解決方案.我有一個 Kivy 應用程序通過藍牙與基于 Arduino 的設備通信.在 Arduino 上，我使用 SerialCommand 庫來接收自定義命令并做出相應的響應.當命令在主線程中發送到我的 Arduino 時，我有一個帶有循環的第二個線程，它從我的藍牙套接字讀取 InputStream.來自 Arduino 的響應包含在 <> 中，當我得到正確的響應時，我會提取括號之間的文本并將其發送到我的主線程中的一個函數.我希望這對你有幫助.

I have finally find a solution that seems to work. I have a Kivy app communicating with an Arduino based device over Bluetooth. On the Arduino I use the SerialCommand library to recieve custom commands and respond accordingly. While the commands is send to my Arduino in the main thread, I have a second thread with a loop that reads the InputStream from my Bluetooth socket. The response from Arduino is enclosed with <>, and when I get a proper response I extract the text between the brackets and send it to a function in my mainthread. I hope this is helpful for you.

from kivy.clock import mainthread
import threading
import jnius

def get_socket_stream(self, name):
    paired_devices =  self.BluetoothAdapter.getDefaultAdapter().getBondedDevices().toArray()
    socket = None
    for device in paired_devices:
        if device.getName() == name:
            socket = device.createRfcommSocketToServiceRecord(
            self.UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"))
            reader = self.InputStreamReader(socket.getInputStream(), 'US-ASCII')
            recv_stream = self.BufferedReader(reader)
            send_stream = socket.getOutputStream()
            break
    socket.connect()
    return recv_stream, send_stream

def connect(self, *args):
    device = self.config.get('bluetooth', 'bt_name')
    try:
        self.recv_stream, self.send_stream = self.get_socket_stream(device)
    except AttributeError as e:
        print e.message
        return False
    except jnius.JavaException as e:
        print e.message
        return False
    except:
        print sys.exc_info()[0]
        return False

    threading.Thread(target=self.stream_reader).start()

def stream_reader(self, *args):
    stream = ''
    while True:
        if self.stop.is_set():
            jnius.detach()
            return
        if self.recv_stream.ready():
            try:
                stream = self.recv_stream.readLine()
            except self.IOException as e:
                print "IOException: ", e.message
            except jnius.JavaException as e:
                print "JavaException: ", e.message
            except:
                print "Misc error: ", sys.exc_info()[0]

            try:
                start = stream.rindex("<") + 1
                end = stream.rindex(">", start)
                self.got_response(stream[start:end])
            except ValueError:
                pass

@mainthread
def got_response(self, response):
    do something...

這篇關于如何在 Kivy 中將 android.bluetooth.socket 輸入流轉換為 python 字符串?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！