How to write a file?

Hi all,

I am totally new to Unity. I have been playing around with it and love how easy it is to use. However I could not find the way to write something into text file. I looked through Script Reference and did some search on the forum. All I found was TextAsset.text which was to read from a text file. I want to save some information in a text file so that I can use that file later in other program.

And also one more question, how do you save game in Unity?

Thank you.

Bent

 

The Unity documentation only documents the Unity-specific APIs.

Here's a link to the msdn documentation about how to write text to a file:

Writing Text to a File

Code examples on that page are in Visual basic and C#. Here's a quick translation into javascript:

Code (csharp):

1.  
2. import System;
3. import System.IO;
4.  
5. var  fileName = "MyFile.txt";
6.  
7. function Start()
8. {
9.         if (File.Exists(fileName))
10.         {
11.             Debug.Log(fileName+" already exists.");
12.             return;
13.         }
14.         var sr = File.CreateText(fileName);
15.         sr.WriteLine ("This is my file.");
16.         sr.WriteLine ("I can write ints {0} or floats {1}, and so on.",
17.             1, 4.2);
18.         sr.Close();
19. }
20.  

 

freyr, that was quick!
Thank you very much.

 

And this is for reading a File

Code (csharp):

1.  
2. import System.IO;
3.  
4. function ReadFile(file : String)
5.    
6.     if(File.Exists(file)){
7.         var sr = File.OpenText(file);
8.         var line = sr.ReadLine();
9.         while(line != null){
10.             Debug.Log(line); // prints each line of the file
11.             line = sr.ReadLine();
12.         }  
13.     } else {
14.         Debug.Log("Could not Open the file: " + file + " for reading.");
15.         return;
16.     }
17. }
18.  

 

|

 

Nice but how to read an int from the txt, or convert a string to int after reading it.

I need to read a vector 3 position, so i need to read it as an int.

thanks

EDIT:

Never mind that, i found out, now i just need to know how to read and write the txts on my ftp server.

 

Hi, I have this code:

...
sw = new StreamWriter("Roupeiro_camisa.txt");
sw.Write("Item escolhido: ");
sw.WriteLine(item.name);
sw.Write("Tempo: ");
sw.WriteLine(Time.time);
sw.Close();
...

this, write to new text file always.
But i want that insted of write to a new file, this add infomation to alredy existing file.
Help please

 

here's how you do i and search on msdn on how to open a txt file to append something to it's end.

 

It is better to have a save data struct and serialize it before saving the file.

I would recommend protocol buffers if you target a mobile platform or the already available JIT deppendant BinaryFormatter of .Net
The first you can find it here https://code.google.com/p/protobuf-net/.

And this is an example for the second.

Code (csharp):

1.         public static void test()
2.         {
3.             //this is the formatter, you can also use an System.Xml.Serialization.XmlSerializer;
4.             var formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
5.            
6.             //initialize some data to save
7.             var data = new SaveData()
8.             {
9.                 somefloatvalue = 10.8F,
10.                 someintvalue = 1,
11.                 somestringvalue = "some data"
12.             };
13.  
14.             //open a filestream to save on
15.             //notice there is no need to close or flush the stream as it will do it before disposing at the end of the using block.
16.             using (Stream filestream = File.Open("filename.dat", FileMode.Create))
17.             {
18.                 //serialize directly into that stream.
19.                 formatter.Serialize(filestream, data);
20.             }
21.  
22.             //and now how to load that data.
23.  
24.             SaveData loaded_data;
25.             //again we open a filestream but now with fileMode.Open
26.             using (Stream filestream = File.Open("filename.dat", FileMode.Open))
27.             {
28.                 //deserialize directly from that stream.
29.                 loaded_data = (SaveData) formatter.Deserialize(filestream);
30.             }
31.         }
32.  
33.         //thi is our save data structure.
34.         [Serializable] //needs to be marked as serializable
35.         struct SaveData
36.         {
37.             public int someintvalue;
38.             public float somefloatvalue;
39.             public string somestringvalue;
40.         }

 

It seems the link you provided is only for VB. There is no C# example there.

 

Try this one instead. https://msdn.microsoft.com/en-us/library/system.io.file(v=vs.110).aspx

Unfortunately links don't last forever.

 

Here's a way to save to a specific path taken from this link.

Code (CSharp):

1.      public static bool WriteLine (string path, string fileName, string data)
2.      {
3.          bool retValue = false;
4.          try {
5.              if (!Directory.Exists (path))
6.                  Directory.CreateDirectory (path);
7.              System.IO.File.WriteAllText (path + fileName, data);
8.              retValue = true;
9.          } catch (System.Exception ex) {
10.              string ErrorMessages = "File Write Error\n" + ex.Message;
11.              retValue = false;
12.              Debug.LogError (ErrorMessages);
13.          }
14.          return retValue;
15.      }

 

Thank you for this.

 

How to keep adding lines to a file on the desktop

Code (CSharp):

1. string d = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Desktop);
2. d = d + "/YOURLOGS";
3.  
4. System.IO.Directory.CreateDirectory(d);
5. // that command means "create if not already there, otherwise leave it alone"
6.  
7. string filename = d + "/log.txt";
8.  
9. try {
10. System.IO.File.AppendAllText(f, some_line_of_text + "\n");
11. }
12. catch {
13. // careful not to create a loop of logging!
14. }