Help Load & RW Xml

[Guess_Game]

Hello
I have a problem with reading xml writing to load the highest score.
I’m working on: an Android project on Visual Studio mac

I found a piece of code that allows you to load the xml from the 3.8 monogamous Content in Copy mode by associating the DLL

string _fileName= new StreamReader(TitleContainer.OpenStream(@“Content/File.xml”)).ReadToEnd();

Code

namespace xmlTest
{
public class Score
{
// public string PlayerName { get; set; }
// public int Value { get; set; }

    public string PlayerName;
    public int Value;
}

}

<?xml version="1.0" encoding="utf-8"?>

  <PlayerName>  testPlayer </PlayerName>
  <Value> 100 </Value>

I found this code to load and write

using (var reader = new StreamReader(new FileStream(_fileName, FileMode.Open)))
{
var serilizer = new XmlSerializer(typeof(List));

          var scores = (List<Score>)serilizer.Deserialize(reader);

          return new ScoreManager(scores);

}

using (var writer = new StreamWriter(new FileStream(_fileName, FileMode.Create)))
{

            var serilizer = new XmlSerializer(typeof(List<Score>));
            serilizer.Serialize(writer, scoreManager.Scores);
  }

Error:

System.IO.DirectoryNotFoundException: Could not find a part of the path "/<?xml version="1.0" encoding="utf-8"?>

  <PlayerName>  testPlayer </PlayerName>
  <Value> 100 </Value>

". at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00177] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/corlib/System.IO/FileStream.cs:223 at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/corlib/System.IO/FileStream.cs:81 at at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode) at xmlTest.Managers.ScoreManager.Load () [0x00001] in /Users/saadaneguessoum/Documents/Projets_monoGame/xmlTest/xmlTest/Managers/ScoreManager.cs:58 at xmlTest.Game1.LoadContent () [0x00028] in /Users/saadaneguessoum/Documents/Projets_monoGame/xmlTest/xmlTest/Game1.cs:57 at Microsoft.Xna.Framework.Game.Initialize () [0x00047] in :0 at xmlTest.Game1.Initialize () [0x00001] in /Users/saadaneguessoum/Documents/Projets_monoGame/xmlTest/xmlTest/Game1.cs:46 at Microsoft.Xna.Framework.Game.DoInitialize () [0x0002c] in :0 at Microsoft.Xna.Framework.AndroidGamePlatform.BeforeUpdate (Microsoft.Xna.Framework.GameTime gameTime) [0x0000e] in :0 at Microsoft.Xna.Framework.Game.DoUpdate (Microsoft.Xna.Framework.GameTime gameTime) [0x00006] in :0 at Microsoft.Xna.Framework.Game.Tick () [0x00131] in :0 at Microsoft.Xna.Framework.AndroidGameWindow.OnUpdateFrame (System.Object sender, Microsoft.Xna.Framework.MonoGameAndroidGameView+FrameEventArgs frameEventArgs) [0x00041] in :0 at Microsoft.Xna.Framework.MonoGameAndroidGameView.UpdateFrameInternal (Microsoft.Xna.Framework.MonoGameAndroidGameView+FrameEventArgs e) [0x0000f] in :0 at Microsoft.Xna.Framework.MonoGameAndroidGameView.UpdateAndRenderFrame () [0x00056] in :0 at Microsoft.Xna.Framework.MonoGameAndroidGameView.processStateRunning (System.Threading.CancellationToken token) [0x0005b] in :0 at Microsoft.Xna.Framework.MonoGameAndroidGameView.RunIteration (System.Threading.CancellationToken token) [0x000f9] in :0 at Microsoft.Xna.Framework.MonoGameAndroidGameView+<>c__DisplayClass62_0.b__0 (System.Object s) [0x00017] in :0 at Android.App.SyncContext+<>c__DisplayClass3_0.b__0 () [0x00000] in <55654ebe9f2a48e6bade2862bb243f94>:0 at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <55654ebe9f2a48e6bade2862bb243f94>:0 at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <55654ebe9f2a48e6bade2862bb243f94>:0 at at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.17(intptr,intptr)

Note: I did not find any problem with the desktop project it loads well and it saves the score

Otherwise if you have another method with Android I am a buyer

thanks in advance

[Charles_Humphrey]

Can’t really make out the error, but could it be access rights?

In my engine I can serilaize by JSON, Binary or XML, it should not matter which one you use, this looks like a IO issue.

When I get chance, Ill see if I can save and load serialized data on an Android device and let you know how I get on, will probably be tomorrow though, sorry

[Guess_Game]

Thank you so much
okay
I am waiting for your answer
have a good day

[Charles_Humphrey]

OK, trying this out on my emulator, this is a IO access vialation as I thought, to get it to work I used
string root = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
to get the root of the application folder, I could then create a folder in there called SaveData and then read and write to a file in there.

Here is my code used in one of my engine samples:

So, I created a class to test with that holes a name and a score, populated it, serialized it, saved it to file, cleared the class out, read the serialized data back in and de serialized it back into the class instance.

Hope this helps

[Charles_Humphrey]

Works on my S10 too

[Guess_Game]

thank you so much
For your help
I’ve been stuck on the problem for a long time

I will test it immediately
I keep you informed

[Guess_Game]

What did you use as a library I can’t find the directive
SerializationManager
Serialization
does it make any difference to work on mac?

thanks in advance

[Charles_Humphrey]

Thats my serialiser, in my engine, thats not the issue, your serialiser will be fine, its how you are accessing the file system thats the issue.

[Guess_Game]

thank you for your help
As I begin I am a little lost

I think I understand my errors but I do not know how to solve them

First the test class I don’t know how to serialize my data

Second point the SaveData folder is created but I do not know where to find it physically?

On the other hand I added the SaveData and xmlFile.xml folder seen in the project but I think I am pointing the wrong way

I am very grateful for what you have done for me

[Charles_Humphrey]

Ok, about to go out, ill try and be a little clearer with the directions in my next post, later.

Sorry you are struggling, we will get there in the end

[Guess_Game]

Okay I’m waiting for your help

thanks in advance

[Charles_Humphrey]

Before I give you a long reply, I just took a look at your screen shhot, where you are creatingt he folder, you have a space in there, that should not be there. You will have created a " SaveData" folder, if that call worked, so the folder “SaveData” does not yet exist when you go to write to it…

[Guess_Game]

Hello

it works thank you

-Where are the files physically stored?
-How can I serialize the contents of the TestClass class?
thank you for spending all this time

[Charles_Humphrey]

Answers to your Questions:-

• Where ever the OS has the data section for your app, if you put a break point in, you can see the value it uses.
• I thought you showed you had a serializer already? Use that, if it’s an XML serializer then you will need to use [Serializable] above the class definition.

Glad you got it working

[Guess_Game]

Hello,

I did as you told me

by adding [Serializable]
I still have the same error

thanks in advance

[Charles_Humphrey]

OK, you need to look up how the serializer you intend to use works, in my initial example, I used a JSON serializer, you are using an XML serialier, the XML serializer will need the class to be public, have a parameterless constructor, and the [Serailiable] attribute

So, the class you want to serialize, in this case TestClass should look omething like this:

If you are declaring this class within another class, then that class also needs to be public.

For more information on XML serialization, check this out.

[Guess_Game]

Thank you beauoup
I created an external class TestClass

by adding the [Serializable]
and the empty constructor by default
and it works
I tested in write mode I will test in read mode to see if I have something inside I will keep you informed
thank you again

[Guess_Game]

Hello

I tested xml reading
I have an error that I don’t understand
am I following the algorithm well

1-create a folder + xml file on the android system
if (! Directory.Exists ($ “{root} / SaveData”))
Directory.CreateDirectory ($ “{root} / SaveData”);
2-create a TestClass class
which returns

public string Name {get; set; }
public long Score {get; set; }

3-add a function call
TestClass test = new TestClass (“test”, 0);
3-serialize the class
var xs = new XmlSerializer (typeof (TestClass));

4-write in the xml file

using (StreamWriter wr = new StreamWriter ($ “{root} /SaveData/test.xml”, false))
{
xs.Serialize (wr, test);

            wr.WriteLine (xs);
        }

but when i test reading here is the error on the image

// read data

        using (StreamReader sr = new StreamReader ($ "{root} /SaveData/test.xml"))
        {
            xs.Deserialize (sr);

            sr.ReadToEnd ();
        }

thanks in advance

[Charles_Humphrey]

It looks like you keep putting spaces in the folder for the file name…

Put it in a string variable and use that to keep it consistent.

[Guess_Game]

sorry

I tested the reading it works
I am very happy because I know that my write function is working well

i just have a question if i want to display just the player name and the score how do i do?
or a list of score and players?

thanks by avacnce