Save a string to a text or cvs file on HoloLens

Cozywolf · December 2016

Hi everyone
I am new to programming and HoloLens development, and I am recently working on an application that requires me to store information in a text, cvs, or xml files on the HoloLens.
I am still looking into Serialization stuff in Unity (since I don't need the read function right now), so I tried to go for an easy path that is to store the data as txt format.
I am able to write a line to the console through Debug.Log (I wrote a function that will return a string) and I what I am trying to do now is to write the line into a txt file. So I guess the two questions I have are:

What is the file path on the HoloLens, am I be able to create a save information to a txt file on HoloLens? And if possible, could someone give me an example how to store it?
Could this file be opened through the whole process? I don't need to modify the file, I just need to add a new line to the file whenever I tap on the button in the application.

Thanks a lot

HoloSheep · December 2016

@Cozywolf

Maybe this post will help get you started.

Jason · December 2016

I'm looking to do the same however whenever the user gazes at an object, I would like timestamps to be created within an Excel or CSV file for when the person gazes at the object and then looks away from the object.

OnGazeEnter - timestamp enter time within the spreadsheet yyyy-mm-dd h:mm am/pm
OnGazeLeave - timestamp exit time within the spreadsheet yyyy-mm-dd h:mm am/pm.

Thanks

Cozywolf · December 2016

I kind of figured it out through some articles and trial and errors. Here is the code I have, the code will write the file to "User Files\LocalAppData[APP name]\LocalState"

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
using System.IO;
using System.Linq;

#if WINDOWS_UWP
using Windows.Storage;
using Windows.System;
using System.Threading.Tasks;
using Windows.Storage.Streams;
#endif

public class countIcons : MonoBehaviour
{

    //define filePath
#if WINDOWS_UWP
    Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
    Windows.Storage.StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
#endif

    //private string saved line;
    private string saveInformation = "";

    private static string timeStamp = System.DateTime.Now.ToString().Replace("/", "").Replace(":", "").Replace(" ", "");
    private static string fileName = timeStamp + ".txt";

    //private save counter
    private static bool firstSave = true;

    //Hashtable declaration
    private static Dictionary<string, IconProperty> iconCollection = new Dictionary<string, IconProperty>();

#if WINDOWS_UWP
    async void WriteData()
    {
        if (firstSave){
        StorageFile sampleFile = await localFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
        await FileIO.AppendTextAsync(sampleFile, saveInformation + "\r\n");
        firstSave = false;
        }
    else{
        StorageFile sampleFile = await localFolder.CreateFileAsync(fileName, CreationCollisionOption.OpenIfExists);
        await FileIO.AppendTextAsync(sampleFile, saveInformation + "\r\n");
    }
    }
#endif

    public void addToCounter(string iconName, IconProperty iconproperty)
    {
        iconCollection[iconName] = iconproperty;
        Debug.Log(iconName);
        iconCollection[iconName].getIconProperty(iconName);
        saveInformation = iconCollection[iconName].iconPropertyOutput(iconName);
#if WINDOWS_UWP
        WriteData();
#endif
    }
}

Jason · December 2016

@Cozywolf Thank you very much for sharing your code, that's very helpful. Cheers!

lukaswerz · February 2017

@Cozywolf

Hi Cozywolf

Thank you for sharing your code. Does this code works in a master build too?

edit: actually I try to run it on a master build in a modified way and get errors. (only on master build....) does someone knows what I m doing wrong?

using System;
using System.IO;
using System.Linq;
#if WINDOWS_UWP
using Windows.Storage;
using Windows.System;
using System.Threading.Tasks;
#endif
public class FileWriter : ILogService

{
    //define filePath
#if WINDOWS_UWP
    StorageFolder storageFolder =
        ApplicationData.Current.LocalFolder;

    private
        Windows.Storage.StorageFile sampleFile;
#endif

    //private string saved line;
    private
        string saveInformation = "";

    private static
        string timeStamp = DateTime.Now.ToString().Replace("/", "").Replace(":", "").Replace(" ", "");

    private static
        string fileName = timeStamp + ".txt";

    //private save counter
    private static
        bool firstSave = true;


    //Hashtable declaration

#if WINDOWS_UWP
    async
        void WriteData
        ()
    {
        if (firstSave)
        {
            sampleFile =
                await storageFolder.CreateFileAsync(fileName,
                    CreationCollisionOption.ReplaceExisting);

            await FileIO.WriteTextAsync(sampleFile, saveInformation + "\r\n");
            firstSave = false;
        }
        else
        {
            await FileIO.AppendTextAsync(sampleFile, saveInformation + "\r\n");
        }
    }
#endif

    public
        void Write
        (string
            text)
    {
        // Debug.Log(text);
        saveInformation = text;
#if WINDOWS_UWP
        WriteData();
#endif
    }
}

Save a string to a text or cvs file on HoloLens

Answers

Windows Holographic User Group Redmond