HarmonyOS 鸿蒙Next rawfile中的mp4视频文件如何放入沙箱中

楼主可以试试以下代码，destpath是对应的沙箱路径

async writeFile(destPath: string) {
  try {
    let context = getContext(this) as common.UIAbilityContext
    let srcFileDescriptor = context.resourceManager.getRawFdSync('adf.mp4');
    let dest = fs.openSync(destPath, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE)
    let bufsize = 4096
    let buf = new ArrayBuffer(bufsize)
    let off = 0, len = 0, readedLen = 0
    while (len = fs.readSync(srcFileDescriptor.fd, buf, { offset: srcFileDescriptor.offset + off, length: bufsize })) {
      readedLen += len
      fs.writeSync(dest.fd, buf, { offset: off, length: len })
      off = off + len
      if ((srcFileDescriptor.length - readedLen) < bufsize) {
        bufsize = srcFileDescriptor.length - readedLen
      }
    }
    fs.close(dest.fd)
    fs.close(srcFileDescriptor.fd)
    promptAction.showToast({
      message: '写入沙盒成功' + destPath,
      duration: 2000
    });
  } catch (err) {
    console.info('write error')
  }

}