Question

我正在开展一个项目，应用程序和脚本之间的可靠和快速（100次/秒）通信非常重要。我已经在双方都实现了Socket通信，但是如果Android应用程序将数据发送到Python脚本，有时（从10开始1-2次），就会出现错误，并且Python脚本无法正确解析收到的数据。例如，重复发送FLAG::val1::val2::val3或FLAG::val1时会出现值错误。

这里我是如何实现Python套接字服务器的：

class Connection():  
def __init__(self): 
    self.connected = False        

def start_connention(self):
    host = '192.168.42.1'
    port = 8888

    self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)         

    #Bind socket to local host and port
    try:
        self.server.bind((host, port))
    except socket.error, msg:
        print 'Bind failed. Error code: ' + str(msg[0]) + ' Message ' + msg[1]
        sys.exit()  

    #Start listening on socket
    self.server.listen(10)
    print 'Socket now listening on ' + str(port)

    self.connection, addr = self.server.accept()
    print 'Connected with ' + addr[0] + ':' + str(addr[1])                

    #Disable blocking
    self.connection.settimeout(0.0)        

    self.connected = True                     

def read(self):
    try:
        data = self.connection.recv(4096).split("::")
    except:
        data = ["N"] #no data
    return data

def send(self, message):
    self.connection.sendall(message)

def close(self):
    print("closing")
    self.connected = False
    self.server.close()

以下是发送SeekBar值的Android代码段：

public class MainActivity extends Activity implements OnSeekBarChangeListener{

SeekBar sbSpeed;

Socket socket;
BufferedReader reader;
PrintWriter writer;
Communication communication;

boolean connected = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);

    sbSpeed = (SeekBar) findViewById(R.id.sbSpeed);
    sbSpeed.setOnSeekBarChangeListener(this);

    communication = new Communication(); 
    // the Thread is started when clicking on a button
}

class Communication implements Runnable{
    public PrintWriter writer;
    public BufferedReader reader;
    public Socket socket;
    public boolean ok;

    public Communication(){
        ok = true;
    }

    @Override
    public void run() {
        try{                
            socket = new Socket(InetAddress.getByName("192.168.42.1"), 8888);
            reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            writer = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
            while(ok){
                String line = reader.readLine(); 
                //parse the line...
            }                                               
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}    

@Override
public void onProgressChanged(SeekBar sb, int progress, boolean fromUser) {
    String text  = "SPEED::" + progress; 

    communication.writer.write(text);
    communication.writer.flush();

    tvSpeed.setText(progress + "");
}

有更好的沟通方式吗？在程序中应该更改什么以避免通信期间出现错误？

编辑：示例已添加。假设此方法位于Connection类中。

def example():
    while True:
        user_data = read()
        if user_data[0] == "SPEED":
            speed = int(user_data[1]) # HERE IS THE VALUEERROR THROWN

编辑： std::move_if_noexcept

Python脚本和Android应用程序之间可靠，快速的通信

0 个答案: