HarmonyOS组件截图后如何将PixelMap保存至系统相册

imageSource.createPixelMap(decodingOptions).then((pixelMap: PixelMap) => { 
  this.pixelMap = pixelMap 
  this.pixelMap.getImageInfo().then((info: image.ImageInfo) => { 
    console.info('info.width = ’ +　info.size.width) 
  }).catch((err: BusinessError) =>{ 
    console.error("Faild " + err); 
  }) 
  imagePackerApi.packing(pixelMap, packOpts).then( (data : ArrayBuffer) => { 
   }).catch((error : BusinessError) => { 
    console.error('Failed to pack the image. And the error is: ’ + error); 
  }) 
  pixelMap.release(); 
})