HarmonyOS 文件拷贝示例

可以使用getRawFileContent获取rawfile文件内容，再写入新文件，提供参考：

copyFile(): void {
  let destRoot = filesDir;
  let srcFileName = "test.txt" //rawFile下的文件名
  let destFilePath = destRoot + "/" + PATH.MEDIA_PATH + "/" + "test.txt";
  try {
  context.resourceManager.getRawFileContent(srcFileName, (error: BusinessError, value: Uint8Array) => {
  if (error != null) {
  console.error("error is " + error);
} else {
  let rawFile = value;
  let fileStream = fileIo.createStreamSync(destFilePath, "w+");
  fileStream.writeSync(rawFile.buffer);
  fileStream.close();
}
});
} catch (error) {
  let code = (error as BusinessError).code;
  let message = (error as BusinessError).message;
  console.error(`callback getRawFileContent failed, error code: ${code}, message: ${message}.`);
}
}