HarmonyOS 怎么将获取的pixelMap转为图片存入沙箱？

let imageFile = fs.openSync(getContext().tempDir+"/VID_1716862918_000.jpg", fs.OpenMode.READ_WRITE|fs.OpenMode.CREATE) 
image.createImagePacker().packToFile(this.pixelMap, imageFile.fd, { 
  format: "image/jpeg", 
  quality: 100 
}).then(res => { 
  console.log('asdasdsd') 
}).catch((err: BusinessError) => { 
  console.log("-----"+JSON.stringify(err)) 
}) 
fs.closeSync(imageFile);