验证pixelmap数据buffer转base64是否正常

let pixelBytesNumber =data.getPixelBytesNumber() 
const buffer = new ArrayBuffer(pixelBytesNumber); 
const Imageinfo:image.ImageInfo = await data.getImageInfo() 
data.readPixelsToBuffer(buffer, (error, res) =>{ 
if(error){ 
return; 
}else{ 
let base64Helper = new util.Base64Helper() 
let base64Image = base64Helper.encodeToStringSync(new Uint8Array(buffer), util.Type.BASIC); 
let arr = new util.Base64Helper().decodeSync(base64Image, util.Type.BASIC);
let buf: ArrayBuffer = arr.buffer.slice(0);  
    // 解码过的 不需要再次解码      
// let imageSource = image.createImageSource(buf);      
const option:image.InitializationOptions = { size:Imageinfo.size  }    
  image.createPixelMap(buf,option).then((pixelMap) => {      
  // result.data = pixelMap       
  // result.code = Code.SUCCESS;        
  // result.msg = ""       
 console.log("222222222222Succeeded in creating PixelMap")   
   }, (error:BusinessError) => {    
    console.error("222222222222222error"+error.message+",code"+error.code)   
   });   
 }  
});