Hololens创建、读取、删除本地文件

参考资料

1.微软官方介绍 saving and finding your files https://developer.microsoft.com/en-us/windows/mixed-reality/saving_and_finding_your_files

2.自定义文件存取方法  http://longqian.me/2017/02/08/hololens-file-transfer/

按照2中的方法，可以将文件保存在 ApplicationData.Current.RoamingFolder文件加下，这样从网页连接hololens时就可以拷贝出来了，比较方便。

写入与读取的方法可以采用uwp提供的方式，示例如下

写入

StorageFolder folder;
        folder = ApplicationData.Current.RoamingFolder;
        StorageFile file = await folder.CreateFileAsync("position.txt", CreationCollisionOption.ReplaceExisting);
        using (StorageStreamTransaction transaction = await file.OpenTransactedWriteAsync())
        {
            using (DataWriter dataWriter = new DataWriter(transaction.Stream))
            {
                dataWriter.WriteString(positionstring);
                transaction.Stream.Size = await dataWriter.StoreAsync();
                await transaction.CommitAsync();
            }
        }

读取

StorageFolder folder;
        folder = ApplicationData.Current.RoamingFolder;
StorageFile file = await folder.TryGetItemAsync("position.txt") as StorageFile;
if (file != null)
        {
            string positionstring = await FileIO.ReadTextAsync(file);
}

读取时用的folder.TryGetItemAsync，这个方法如果打开文件失败的话会返回null，方便后续操作。