add iconv module and change print method

PrinterDev.js

@@ -2,7 +2,7 @@ const EventEmitter = require('events')
 const escpos = require('escpos')
 const config = require('./config.json')
 const fs = require('fs')
-
+const iconv = require('iconv-lite')
 // const device = new escpos.Serial(config.printer.serial)
 
 // const printer = new escpos.Printer(device)
@@ -16,6 +16,11 @@ class PrinterDevice {
     this._type = null // type = serial or console
   }
 
+  encodeStr(str){
+    if(!str || typeof str != 'string') return false
+    return iconv.encode(str, 'big5')
+  }
+
   async connect() {
     let chkSerial = await new Promise((resolve, reject) => {
       fs.access(config.printer.serial, err => {
@@ -66,11 +71,13 @@ class PrinterDevice {
             let size = tmp.substring(2)
             let sarr = size.trim().split(',')
             if (sarr != 2) break
+            if(!isFinite(sarr[0]) || !isFinite(sarr[1])) break
+            sarr = sarr.map(t => Math.floor(t))
             this._printer.size(sarr[0], sarr[1])
             break
         }
       } else {
-        this._printer.text(tmp, 'big5')
+        this._printer.print(this.encodeStr(tmp))
       }
     }
 

package.json

@@ -6,6 +6,7 @@
   "dependencies": {
     "bleno": "^0.4.2",
     "escpos": "^2.4.3",
+    "iconv-lite": "^0.4.18",
     "uuid": "^3.1.0"
   }
 }