Node.js：将 Buffer 形式的 USB 流转换为字符串

Question

我使用我的 Raspberry Pi 读取 RFID 标签。 我的 RFID 阅读器通过 USB 连接，像 HID 键盘一样工作。 我使用 Node.js 版本 12.x，以下 npm 包：

• 节点隐藏
• USB检测

我的代码是：

/* app.js */
const HID = require('node-hid');
const usbDetect = require('usb-detection');
 
usbDetect.startMonitoring();

console.log("=== START ===")
 
// Detect add/insert
usbDetect.on('add', function(device) { 
    console.log('add0', device); 
    listenToInput(device)
});
 
// Detect remove
usbDetect.on('remove', function(device) { console.log('remove0', device); });


// Observe input Data
 function listenToInput(device){
    console.log("Listen start", device);
    
    // get Connection to RFID Scanner
    var RFIDscanner = new HID.HID(device.vendorId, device.productId);
    RFIDscanner.on("data", function(data) {
        console.log(data, new Date())
        
        //var dataArr = Array.prototype.slice.call(new Uint8Array(data, 0, 8))
        //console.log(dataArr);
        //console.log("string",data.toString());
        
    });
}

代码运行良好； 我得到以下输出。

<Buffer 00 00 27 00 00 00 00 00> 2019-12-25T17:56:35.692Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.700Z
<Buffer 02 00 09 00 00 00 00 00> 2019-12-25T17:56:35.716Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.724Z
<Buffer 00 00 27 00 00 00 00 00> 2019-12-25T17:56:35.732Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.740Z
<Buffer 00 00 27 00 00 00 00 00> 2019-12-25T17:56:35.756Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.764Z
<Buffer 00 00 1e 00 00 00 00 00> 2019-12-25T17:56:35.772Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.780Z
<Buffer 02 00 06 00 00 00 00 00> 2019-12-25T17:56:35.796Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.804Z
<Buffer 00 00 1e 00 00 00 00 00> 2019-12-25T17:56:35.812Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.820Z
<Buffer 00 00 22 00 00 00 00 00> 2019-12-25T17:56:35.836Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.844Z
<Buffer 00 00 25 00 00 00 00 00> 2019-12-25T17:56:35.852Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.860Z
<Buffer 02 00 04 00 00 00 00 00> 2019-12-25T17:56:35.876Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.885Z
<Buffer 00 00 28 00 00 00 00 00> 2019-12-25T17:56:35.892Z
<Buffer 00 00 00 00 00 00 00 00> 2019-12-25T17:56:35.900Z

我的问题是，

如何将 Buffer (-stream?) 转换为 String。 我试过data.toString() ，还有参数 ascii、utf8 和 hex； 但我没有得到我想要的字符串。 如果我在文本文件中打印 RFID 标签（没有我的 node.js 脚本），我会得到以下输出： 0F001C158A

问候

Answer 1

使用 node-hid-stream 和 KeyboardLines。

https://github.com/agirorn/node-hid-stream

少麻烦。