开发HarmonyOS应用时，如何集成并使用系统的云存储服务进行文件同步与备份？

Question

开发HarmonyOS应用时，如何集成并使用系统的云存储服务进行文件同步与备份？

Answer 1

上传文件到云存储：

async function uploadFileToCloud(filePath, cloudFileName) {
  const fileStream = await file.open(filePath);
  const buffer = new ArrayBuffer(1024);
  let bytesRead = await file.read(fileStream.fd, buffer, 0, buffer.byteLength);
  const uploadTask = cloud.upload(cloudFileName);
  while (bytesRead > 0) {
    await uploadTask.write(buffer.slice(0, bytesRead));
    bytesRead = await file.read(fileStream.fd, buffer, 0, buffer.byteLength);
  }
  await uploadTask.close();
  await file.close(fileStream.fd);
}