HarmonyOS 使用imagePacker获取的相机预览图片失败

packingPicture(imgArray: ArrayBuffer, img: image.Image) {
  let path = getContext(this).cacheDir + "/test.jpeg"
  let sourceOptions: image.SourceOptions = {
    sourceDensity: 120,
    sourcePixelFormat: image.PixelMapFormat.NV21,
    sourceSize: {height: this.sHeight, width: this.sWidth}
  }
  let imageSource = image.createImageSource(imgArray, sourceOptions)
  let packer = image.createImagePacker()
  let packingOpt: image.PackingOption = {
    format: "image/jpeg", quality: 100
  }
  let file = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
  packer.packToFile(imageSource, file.fd, packingOpt)
}
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