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  4. How to read data into array from textfile?

How to read data into array from textfile?

Scheduled Pinned Locked Moved Visual Basic
data-structurestestingbeta-testingtutorialquestion
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  • T TeiUKei

    I try to read data into array and display the data, however i only manage to get 1 in return. Below is my coding, may i have some suggestion and advice? Option Strict On Imports System.IO Public Class Form1 Private Function Language(ByVal MLanguage As Integer, ByVal RequestDataID() As Integer, ByRef GetBackWord() As String) As String Dim s As String = String.Empty Dim Number As Integer = 0 Dim sFileName As String If MLanguage = 1 Then sFileName = "C:\testing.txt" Try Dim oFile As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read) Dim oReader As StreamReader = New StreamReader(oFile) Dim a As Integer = 0 Do Until (Number = RequestDataID(a)) If Number < RequestDataID(a) Then s = oReader.ReadLine() Language = s 'GetBackWord(6) = s Number += 1 a += 1 Else s = oReader.ReadLine() End If Loop oReader.Close() oFile.Close() Catch GetBackWord(0) = "a." End Try ElseIf MLanguage = 2 Then sFileName = "C:\Maklumat.txt" Try Dim oFile As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read) Dim oReader As StreamReader = New StreamReader(oFile) Dim a As Integer = 0 Do Until (Number = RequestDataID(a)) If Number < RequestDataID(a) Then s = oReader.ReadLine() GetBackWord(a) = s Number += 1 a += 1 Else s = oReader.ReadLine() End If Loop oReader.Close() oFile.Close() Catch GetBackWord(0) = "a" End Try Else sFileName = "C:\CMsg.txt" Try Dim oFile As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read) Dim oReader As StreamReader = New StreamReader(oFile) 'Dim a As Integer =

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    Christian Graus
    wrote on last edited by
    #2

    TeiUKei wrote:

    s = oReader.ReadLine() Language = s

    This seems redundant. Either way, your return value is being changed every time, not accumulated. Is that the intention ?

    Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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    • C Christian Graus

      TeiUKei wrote:

      s = oReader.ReadLine() Language = s

      This seems redundant. Either way, your return value is being changed every time, not accumulated. Is that the intention ?

      Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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      TeiUKei
      wrote on last edited by
      #3

      No, my intention is for example, everytime i receive a requestID(3), i will read 4 lines from the textfile and store in the array, GetBackWord(3) and display the lines i get. Any suggestion? I stuck there and be so appreciate for help.

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      • T TeiUKei

        No, my intention is for example, everytime i receive a requestID(3), i will read 4 lines from the textfile and store in the array, GetBackWord(3) and display the lines i get. Any suggestion? I stuck there and be so appreciate for help.

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        Christian Graus
        wrote on last edited by
        #4

        I'm not really sure what you mean. The code looks messy - perhaps if you told us what's in the file, and what you expect the function to return ( and what you're getting instead ) ?

        Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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        • C Christian Graus

          I'm not really sure what you mean. The code looks messy - perhaps if you told us what's in the file, and what you expect the function to return ( and what you're getting instead ) ?

          Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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          TeiUKei
          wrote on last edited by
          #5

          Well, this is the data in the file No,Title 1,Error Message Information Question a b c d e f Let say i receive RequestDataID = {1,2,3,4,5,6,7}, then for RequestDataID(0),line 1 will be read and stored in GetBackWord(0) which then send back to the function called and same with the other. However, i only manage to get c in return. What should i suppose to do?

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          • T TeiUKei

            Well, this is the data in the file No,Title 1,Error Message Information Question a b c d e f Let say i receive RequestDataID = {1,2,3,4,5,6,7}, then for RequestDataID(0),line 1 will be read and stored in GetBackWord(0) which then send back to the function called and same with the other. However, i only manage to get c in return. What should i suppose to do?

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            Christian Graus
            wrote on last edited by
            #6

            I honestly can't work out how this code is supposed to work. Really, what you should do is read the entire file into an array, File.ReadAllLines (from memory ) does this. Then you can copy whatever lines you want. Other suggestion - set a breakpoint and step through your code to try and work out where it's going wrong.

            Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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            • C Christian Graus

              I honestly can't work out how this code is supposed to work. Really, what you should do is read the entire file into an array, File.ReadAllLines (from memory ) does this. Then you can copy whatever lines you want. Other suggestion - set a breakpoint and step through your code to try and work out where it's going wrong.

              Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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              TeiUKei
              wrote on last edited by
              #7

              Well, thanx for help anyway!!

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              • T TeiUKei

                Well, thanx for help anyway!!

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                Christian Graus
                wrote on last edited by
                #8

                I was hoping we might dig a little deeper. Does File.ReadAllLines ( or whatever it is ) help ?

                Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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                • C Christian Graus

                  I was hoping we might dig a little deeper. Does File.ReadAllLines ( or whatever it is ) help ?

                  Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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                  TeiUKei
                  wrote on last edited by
                  #9

                  I checked my code and wondered if it was because RichTextbox only take the recent memory, that's why it only displayed one of it.

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                  • T TeiUKei

                    I checked my code and wondered if it was because RichTextbox only take the recent memory, that's why it only displayed one of it.

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                    C Offline
                    Christian Graus
                    wrote on last edited by
                    #10

                    The rich text box will show exactly what you ask it to. If the function returns what you expect, then the problem is how you assign it to the rich text box.

                    Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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                    • C Christian Graus

                      The rich text box will show exactly what you ask it to. If the function returns what you expect, then the problem is how you assign it to the rich text box.

                      Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog

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                      TeiUKei
                      wrote on last edited by
                      #11

                      Well, i solve the problem of display data. Thanx!!!

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