HarmonyOS 关于求文件的md5

用如下接口获取文件哈希值：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-file-hash-V5

getContext(this).resourceManager.getRawFileContent('c277909072a52ba40f110cee1ddfb155.zip', (_err, value) => {
  let myBuffer: ArrayBufferLike = value.buffer
  let context = getContext(this);
  //沙箱路径
  let filePath = context.filesDir + "/testTemp.zip";
  console.log("testTag-filePath:" + filePath);
  let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
  let writeLen = fs.writeSync(file.fd, myBuffer);
  console.info("testTag-write data to file succeed and size is:" + writeLen);
  fs.closeSync(file);
  Hash.hash(filePath, "md5").then((str: string) => {
    console.info("calculate file hash succeed:" + str);
  }).catch((err: BusinessError) => {
    console.error("calculate file hash failed with error message: " + err.message + ", error code: " + err.code);
  });
});