HarmonyOS 使用fs压缩图片后，内存持续增长？

Question

//打开相册选择图片完成
let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();
PhotoSelectOptions.MIMEType = 'image/*';
        PhotoSelectOptions.maxSelectNumber = 9;
        let photoPicker = new photoAccessHelper.PhotoViewPicker();
        //打开相册
        photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => {
//处理返回结果，获取uri,转换为base64字符串
PhotoSelectResult.photoUris.forEach((uri,index)=>{
            this.packageImage(uri,80).then(()=>{})
          })
})

  //uri：相册图片uri， precent：压缩系数
  packageImage(uri: string, precent: number): Promise<BOBSelectImageModel> {
    return new Promise<BOBSelectImageModel>((resolve, reject) => {
      let selectModel = new BOBSelectImageModel()
      const imagePackerApi: image.ImagePacker = image.createImagePacker();
      let file = fileIo.openSync(uri, fileIo.OpenMode.READ_ONLY);
      const imageSourceApi: image.ImageSource = image.createImageSource(file.fd);
      let comNum = Math.trunc(precent)
      let packOpts: image.PackingOption = { format: "image/jpeg", quality: comNum }
      imagePackerApi.packing(imageSourceApi, packOpts).then((data: ArrayBuffer) => {
        if (data.byteLength > 0) {
          let base64Str = buffer.from(data).toString('base64')
          let resultBase64Str = base64Str ? base64Str : ''
          BoBLog.debug('', 'resultBase64Str长度-=======+++====' + resultBase64Str.length);
          selectModel.PhotoImg = resultBase64Str
          selectModel.precent = 0
          fileIo.close(file.fd,(err: BusinessError) => {
            if (err) {
              console.error("close file failed with error message: " + err.message + ", error code: " + err.code);
            } else {
              console.info("close file succeed");
            }
          })
          resolve(selectModel)
        } else {
          // fileIo.closeSync(file.fd);
          selectModel.precent = 1
          resolve(selectModel)
        }
      })
    })
  }

多次调用上述压缩方法packageImage，内存会持续增加，最后导致闪退。fileIo.close关闭打印日志为成功。该方法压缩图片方式是否存在问题。有无解决方法

Answer 1

解决方案

该方法可以正常处理压缩图片，建议使用release方法释放当前实例对象。用法参考文档：

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-image-V5\#release7

如果想进一步提升查找性能，可以使用二分查找最接近指定图片压缩目标大小的图片质量quality来压缩图片，示例参考：

https://gitee.com/harmonyos-cases/cases/tree/master/CommonAppDevelopment/feature/imagecompression\#%E9%AB%98%E6%80%A7%E8%83%BD%E7%9F%A5%E8%AF%86%E7%82%B9