Re: [問題] 藍芽接值 掉值問題

[fake01 (code)]

※ 引述《fake01 (code)》之銘言：
: 使用手機藍芽接值,而接的值是由硬體端不斷丟值,
: 通常一秒丟一串字串 例如 123$456# or 455$123$
: 但是藍芽這邊接一次有時候會漏掉值 123456# 或 123$56，
: 但有時候又會正常接,是無法判斷硬體這邊丟一次的字串是甚麼，
: 請問該如何解決呢
: case MESSAGE_READ:
:   byte[] readBuf = (byte[]) msg.obj;
:   // construct a string from the valid bytes in the buffer
:   String readMessage = null;
:     try {
:               readMessage = new String(readBuf, 0,msg.arg1,"GBK");
:         }
:     catch (UnsupportedEncodingException e)
:         {
:               // TODO Auto-generated catch block
:              e.printStackTrace();
:         }
:   break;
:  // 以上就是藍芽抓值的code,麻煩各位了


因為C大說貼socket部分的code

會比較好懂，我是用Chat? 那個藍芽範例所改的應該沒甚麼問題


private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            Log.d(TAG, "create ConnectedThread");
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) {
                Log.e(TAG, "temp sockets not created", e);
            }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            Log.i(TAG, "BEGIN mConnectedThread");
            byte[] buffer = new byte[1024];
            int bytes;

            // Keep listening to the InputStream while connected
            while (true) {
                try {
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);

                    // Send the obtained bytes to the UI Activity
                    mHandler.obtainMessage(TestbtActivity.MESSAGE_READ,
bytes, -1, buffer)
                            .sendToTarget();
                } catch (IOException e) {
                    Log.e(TAG, "disconnected", e);
                    connectionLost();
                    break;
                }
            }
        }

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推 MetalChao:我不知道你掉值的問題在哪, 不過對於你的code有幾點想法
→ MetalChao:1. 你的值內容是什麼樣子? 為什麼要用 GBK encoding?
→ MetalChao:2. constructor 如果真的有 io exception, 你只是忽略掉
→ MetalChao:那麼接下來的 run 裡就會有 null pointer exception
→ MetalChao:3. tmpIn tmpOut 這兩個變數是不需要的
→ fake01:掉直就像是應該要給123#456 變成 #456 或 56
→ fake01:因為傳值端丟過來的值要用GBK才看得懂