const {readFile, readFileSync} = require('fs');
const decodeImage = require('jimp').read;
const qrcodeReader = require('qrcode-reader');
const path = require("path");
var p = path.resolve(__dirname,"data/qrcode2.jpg"); 
readFile(p,function(err,fileBuffer){
  if(err){
    throw new Error(err);
    return ;
  } 
  decodeImage(fileBuffer,function(err,image){
    if(err){
      throw new Error(err);
      return ;
    }
    let decodeQR = new qrcodeReader();
    decodeQR.callback = function(errorWhenDecodeQR, result) {
      if (errorWhenDecodeQR) {
        throw new Error(errorWhenDecodeQR)
        return;
      }
      if (!result){
        console.log("gone with wind");
      }else{
        console.log(result.result); //结果
      }      
     };    
    decodeQR.decode(image.bitmap);      
  });  
})