调用蓝牙打印机打印一维码

if(bluetoothSocket.isConnected()) {  
            var outputStream = bluetoothSocket.getOutputStream();  
            plus.android.importClass(outputStream);  

            var bytes = plus.android.invoke(string, 'getBytes', 'gbk');  //其它内容  

            var bar = plus.android.invoke(billcode, 'getBytes', 'gbk');  

                outputStream.write(bytes);  
                outputStream.flush();  
                outputStream.write(29);  
                outputStream.write(72);  
                outputStream.write(2);  

                outputStream.flush();    //hri字符打印位置  
                outputStream.write(29);  
                outputStream.write(119);  
                outputStream.write(2);  

                outputStream.flush();    //条码宽度  
                outputStream.write(29);  
                outputStream.write(104);  
                outputStream.write(81);  

                outputStream.flush();  //条码高度  

                outputStream.write(29);  
                outputStream.write(107);   //打印条码  
                outputStream.write(73);   // 条码类型   code128  
                outputStream.write(15);   //  条码位数  

                outputStream.write(123);        
                outputStream.write(66);    //code128 的子类型，有128a,128b,128c  
                outputStream.write(bar);  
                outputStream.flush();  

            outputStream.flush();  
            device = null //这里关键  
            bluetoothSocket.close(); //必须关闭蓝牙连接否则意外断开的话打印错误

    }