StreamReader.ReadLine to Array and only display 5 lines at a time c#

I have been looking all night but I just cant get the code right, What is the best way to read from a text file, turn it into a array or whatever is best. Then reference that array 5 lines at a time.

I tried counting the lines and turing that into the arrays index or adding each array in a loop but I cant seem to get it right.

Heres my code, but you will probably have something better:

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4. using System;
5. using System.IO;
6.  
7. public class TextGenerator : MonoBehaviour {
8.    
9.     protected FileInfo theSourceFile = null;
10.     protected StreamReader reader = null;
11.     protected string text = " ";
12.     //public int linesCount = 0;
13.     //string[] lines = new string[]{"","","","","","","","","","", };
14.    
15.     void Start () {
16.        theSourceFile = new FileInfo ("Assets/Text/Test.txt");
17.        reader = theSourceFile.OpenText();
18.        
19.         //loop through lines and create array
20.        
21.         //count lines but doesnt help read
22.     //string line;
23.     //while ((line = reader.ReadLine()) != null)
24.         //{
25.             //linesCount++;
26.         //}
27.     }
28.    
29.     void Update () {
30.        
31.         if (Input.anyKey){
32.         ReadText();
33.         }
34.        
35.     }
36.     void OnGUI()
37.     {
38.         GUI.Label(new Rect(50, 50, 500, 500), text);
39.  
40.     }
41.    
42.     void ReadText(){
43.        
44.         if (text != null ) {
45.                        
46.             text +=  reader.ReadLine();
47.             text += "\n";
48.            
49.             // Console.WriteLine(text);
50.             //print (text);
51.         }
52.     }
53. }
54.  

Your help is much appreciated

 

so you want the first 5 lines of a file? or you want to display the text from the file like line1-5 then the next bunch of lines that will be displayed are 6-10.

Code (csharp):

1.  
2. void ReadFile(string DataPath){
3.                 using (StreamReader sr = new StreamReader(DataPath))
4.             {
5.            
6.                 Readfile = new string[File.ReadAllLines(DataPath).Length];
7.                 String line;
8.                 int t = 0;
9.                 // Read and display lines from the file until the end of
10.                 // the file is reached.
11.                 while ((line = sr.ReadLine()) != null)
12.                 {
13.                     //here you can put something(like an if) that when it hits the 5th line it will stop reading
14.                     Readfile[t] = line;
15.                
16.                     t += 1;
17.                 }
18.             }
19.     }
20.  
21.       static string ConvertStringArrayToString(string[] array)
22.     {
23.     //
24.     // Concatenate all the elements into a StringBuilder.
25.     //
26.     StringBuilder builder = new StringBuilder();
27. foreach (string value in array)
28.     {
29.         builder.Append(value);
30.         builder.Append('\n');
31.     }
32.     return builder.ToString();
33.     }
34.  
35. text = ConvertStringArrayToString(Readfile);
36.  

Something like that?

 

Hello Falin from the Netherlands,

Thank you so much for you knowledge,

yes. And then everytime you press a key it will dispay the next 5 and the next 5 and the next 5 until its null.

Is it better to store goups of 5 lines in each array element? What would be the best way to loop though the array 5 element at a time? would I still need the StringBuilder?

Below is the working code dispaying all read line:

Code (csharp):

1.  
2. protected FileInfo theSourceFile = null;
3. protected StreamReader reader = null;
4. protected string text = " ";
5. public string[] Readfile;
6. int currentLine = 0;
7.     void Start () {
8.         ReadFile("Assets/Text/Test.txt");
9.         text = ConvertStringArrayToString(Readfile);
10.     }
11.     void Update () {
12.         if (Input.anyKeyDown){     
13.         }
14.     }
15.    void OnGUI()
16.     {
17.         GUI.Label(new Rect(50, 50, 500, 500), text);
18.     }
19.     void ReadFile(string DataPath){
20.          using (StreamReader sr = new StreamReader(DataPath))
21.             {
22.                 Readfile = new string[File.ReadAllLines(DataPath).Length];
23.                 String line;
24.                 int t = 0;
25.                 // Read and display lines from the file until the end of
26.                 // the file is reached.
27.                 while ((line = sr.ReadLine()) != null)
28.                     {
29.                     //here you can put something(like an if) that when it hits the 5th line it will stop reading           
30.                     Readfile[t] = line;
31.                     t += 1;            
32.                     }
33.            }
34.     }
35.       static string ConvertStringArrayToString(string[] array)
36.     {
37.     //
38.    // Concatenate all the elements into a StringBuilder.
39.     //
40.     StringBuilder builder = new StringBuilder();
41.     foreach (string value in array)
42.     {
43.         builder.Append(value);
44.         builder.Append('\n');
45.     }
46.     return builder.ToString();
47.    }
48.  

 

K i played around with your code and came up with this:

Code (csharp):

1. protected FileInfo theSourceFile = null;
2.     protected StreamReader reader = null;
3.     protected string text = " ";
4.     public string[] Readfile;
5.     static public int LineCount;
6.     static public int LineCountMax;
7.     int currentLine = 0;
8.         void Start () {
9.             LineCountMax = 4;
10.             ReadFile("Assets/Text/test.txt");
11.            // text = ConvertStringArrayToString(Readfile);
12.         }
13.         void Update () {
14.             if (Input.anyKeyDown){  
15.                 Debug.Log("pressed");
16.                 text = ConvertStringArrayToString(Readfile);
17.                 LineCount = LineCountMax;
18.                 LineCountMax += 5;
19.             }
20.         }
21.        void OnGUI()
22.         {
23.             GUI.Label(new Rect(0, 0, 500, 500), text);
24.         }
25.         void ReadFile(string DataPath){
26.              using (StreamReader sr = new StreamReader(DataPath))
27.                 {
28.                     Readfile = new string[File.ReadAllLines(DataPath).Length];
29.                     String line;
30.                     int t = 0;
31.                     // Read and display lines from the file until the end of
32.                     // the file is reached.
33.                     while ((line = sr.ReadLine()) != null)
34.                         {
35.                         //here you can put something(like an if) that when it hits the 5th line it will stop reading          
36.                         Readfile[t] = line;
37.                         t += 1;            
38.                         }
39.                }
40.         }
41.           static string ConvertStringArrayToString(string[] array)
42.         {
43.         //
44.        // Concatenate all the elements into a StringBuilder.
45.         //
46.         int i = 0;
47.              i= LineCount;
48.         StringBuilder builder = new StringBuilder();
49.         while(i <= LineCountMax  array[i] != null)
50.         {
51.             builder.Append(array[i]);
52.             builder.Append('\n');
53.             //Debug.Log("Line:"+i +"LineMax" +LineCountMax);
54.             i++;
55.         }
56.         return builder.ToString();
57.        }

maybe it helps

 

Hello Falin,

In my Build verion, the string file path doesnt work ofcourse because it can't find the sting "DataPath" that in found in the Editor.

I tried playing around with:

TextAsset asset = Resources.Load("something") as TextAsset;
Stream s = new MemoryStream(asset.bytes);
BinaryReader br = new BinaryReader(s);

But I can seem to get it to work. I will keep trying. in the mean time, Any suggestions or work arounds? anyone?

 

With the code from above it couldn't find the string DataPath itself or it couldn't find the test.txt file?

because if it cant find the test.txt:
You could do it something like this:

Code (csharp):

1.     using (StreamReader sr = new StreamReader(Application.dataPath +DataPath))
2.            
3.                 Readfile = new string[File.ReadAllLines(Application.dataPath +DataPath).Length];

then you should remove the "/Assets/" from your path string.

 

Hi. Please, i program in javascript and i'm now trying to rewrite a c# script in java so i can use it in my project. I want to ask if you know how it is possible to create a stringBuilder in javascript. I have tried different means and it gives errors like - "Unknown identifier" or "does not denote a valid type".

 

There is no standard StringBuilder implemented in JavaScript .
After searching in google I found this:
http://www.codeproject.com/Articles/12375/JavaScript-StringBuilder
Haven't used it myself so dont know if it will work with unity. But you can always try tho.