Nodejs serialport data.toString（）失敗的編碼

Question

我有一個條形碼掃描器連接到運行nodejs serialport的覆盆子pi。一個串口實例是聽/dev/input/event0

當我運行這個

var serialport = require("serialport"); 
var SP = serialport.SerialPort; 
var port = "/dev/input/event0" 
var sp = new SP(port); 


sp.on('data', function(data) { 
    console.log(data); 
}); 

我的git Buffer對象的BLOB從掃描。 （我認爲這對在該代碼作爲數據事件的每個號碼。

我的問題是，我甚至不能讓它converto適當的UTF8號碼。我怎樣才能得到的數據解碼？

更新-1：這是原始console.log(data)的掃描條形碼與數字之後的結果19024336

<Buffer 32 a9 3b 51 54 76 0c 00 04 00 04 00 1e 00 07 00 32 a9 3b 51 6d 76 0c 00 01 00 02 00 01 00 00 00 32 a9 3b 51 76 76 0c 00 00 00 00 00 00 00 00 00> 
<Buffer 32 a9 3b 51 c6 8d 0c 00 04 00 04 00 1e 00 07 00 32 a9 3b 51 dc 8d 0c 00 01 00 02 00 00 00 00 00 32 a9 3b 51 e2 8d 0c 00 04 00 04 00 26 00 07 00 32 a9 3b ...> 
<Buffer 32 a9 3b 51 61 cc 0c 00 04 00 04 00 1f 00 07 00 32 a9 3b 51 78 cc 0c 00 01 00 03 00 00 00 00 00 32 a9 3b 51 7e cc 0c 00 04 00 04 00 21 00 07 00 32 a9 3b ...> 
<Buffer 32 a9 3b 51 5f fb 0c 00 00 00 00 00 00 00 00 00 32 a9 3b 51 e4 0a 0d 00 04 00 04 00 20 00 07 00 32 a9 3b 51 fc 0a 0d 00 01 00 04 00 00 00 00 00 32 a9 3b ...> 
<Buffer 32 a9 3b 51 f6 d5 0d 00 04 00 04 00 28 00 07 00 32 a9 3b 51 0a d6 0d 00 01 00 1c 00 00 00 00 00 32 a9 3b 51 12 d6 0d 00 00 00 00 00 00 00 00 00> 

它返回不同的結果（從我的什麼人眼可以讀這裏）我每次掃描

您可能也對此感興趣知道Buffer.isBuffer(data);返回true

Answer 1

你應該在這樣的模塊來看一看：https://github.com/Bornholm/node-keyboard

爲了詳細說明雖然，得到的答覆是，/dev/input/event0輸出不是ASCII字符。輸出是一系列結構，格式爲https://www.kernel.org/doc/Documentation/input/input.txt，格式爲struct input_event。

舉例來說，這意味着以你輸出的第二塊

32 a9 3b 51 54 76 0c 00 04 00 04 00 1e 00 07 00 

擊穿這樣的：

// 32-bit int timestamp (1362864434) - Sat, 09 Mar 2013 21:27:14 GMT 
32 a9 3b 51 

// microsecond-granularity time 
54 76 0c 00 

// 16-bit short (1) indicating it is a key event 
01 00 

// 16-bit short (2) is the keycode for the key '1'. 
02 00 

// 32-bit int (1) indicating it was a keypress. 
01 00 00 00