Question

Read a file line by line

Asked by: YourReference

I need some code that reads a file line by line that is compitable with VB 2003 (.NET 1.1).

I have been using the StreamReader however, I noticed than if Excel opens the file that my program is trying to read, the program crashes because it is locked.  The System.IO.FileStream appears to have options to open the file in ReadOnly mode, thus hopefully ignoring any file locks from Excel.

I require some code to open a CSV file and read each line.  The below example works however I need to ensure that my code does not lock a file during the stream or care about another program that opened the file.

Example:

Dim oFSO As New System.IO.StreamReader(master_database)
 
        '** read each line looking for my servername
        Do While oFSO.Peek() <> -1
 
            line = oFSO.ReadLine
            lineSplit = Split(line, ",")
            lineTemp = CStr(lineSplit(0))
 
                regKey.SetValue("cache_load_evaluator", CStr(lineSplit(4)))
                regKey.SetValue("cache_disable_schedule", CStr(lineSplit(9)))
                regKey.SetValue("cache_reboot_hour", CStr(CInt(lineSplit(8))))
                regKey.SetValue("cache_schedule", CStr(CInt(lineSplit(5))))
                regKey.SetValue("cache_start_date", CStr(CDate(lineSplit(6))))
                regKey.SetValue("cache_unavailable_hour", CStr(CInt(lineSplit(7))))
                regKey.SetValue("cache_last_modified", CStr(modifieddate))
 
        Loop
 
        oFSO.Close()

                                  
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Asked On
2008-12-05 at 13:19:49ID23961743
Tags

VB.NET

,

VB 2003

,

.NET 1.1

Topic

.NET Framework 1.x

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: ranhellPosted on 2008-12-05 at 13:42:59ID: 23109120

try this code

Imports System.IO 
 
Private Sub BTNLOAD_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BTNLOAD.Click
        Dim fs As StreamReader
        Dim openFileDialog1 As New OpenFileDialog()
       
        openFileDialog1.InitialDirectory = "C:\EX\TXT"
        openFileDialog1.Filter = "txt files (*.txt)|*.txt"
        openFileDialog1.FilterIndex = 2
        openFileDialog1.RestoreDirectory = True
 
        If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
            Try
                strpath = openFileDialog1.FileName
                fs = New StreamReader(strpath)
                If (fs IsNot Nothing) Then
                    ' Insert code to read the stream here.
                    While Not fs.EndOfStream
                        strLine = fs.ReadLine()
                    End While
                    MessageBox.Show("File loaded")
                    
                End If
            Catch Ex As Exception
                MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
            Finally
                ' Check this again, since we need to make sure we didn't throw an exception on open.
                strpath = openFileDialog1.FileName
                fs = New StreamReader(strpath)
                If (fs IsNot Nothing) Then
                    fs.Close()
                End If
            End Try
        End If
    End Sub

                                              
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by: YourReferencePosted on 2008-12-05 at 16:12:45ID: 23109945

This looks like the same code as mine.  The issue I need to resolve is opening the file as read only.

 

by: ranhellPosted on 2008-12-06 at 13:43:18ID: 23113752

Try this

What kind of file are you trying to open?

If you're trying to open MS Office files in read-only mode (without changing file attributes), then you can do it by using Word ActiveX library.

 - in Project -> References  select Word x.x library       (where x is a version number, mine is 9.0)
 - paste this code:
'---------------------------------------------------
Option Explicit

Dim a As Word.Application                           'define an object which is used to communicate with MS Word Application

Private Sub Form_Load()
    Set a = New Word.Application                  'create a Word Application Object (Start new Word Application)
   
    a.Visible = True                                      'make it visibe
    a.Documents.Open "c:\test.txt", False, True              'open the file in read-only mode (third parameter enables read-only mode)
End Sub

Private Sub Form_Unload(Cancel As Integer)
    a.Quit                                                     'quit Word
    Set a = Nothing                                       'clean-up
End Sub
'----------------------------------------------

This will start Word application and open C:\test.txt in read-only mode.
To open different types of office files, for example Excell or PowerPoint, you have to include corresponding library and open it in the same way as in
the example above.


http://www.experts-exchange.com/Programming/Languages/Visual_Basic/VB_Controls/Q_21438858.html

 

by: YourReferencePosted on 2008-12-06 at 20:40:20ID: 23114777

I have created a Windows Service that reads a simple text file.  The extension of the text file is CSV.  The CSV file has a list of server names, and the scheduled times for them to reboot.  Each hour, each server checks this file.  It seems when more than one server reads this file at the same time, the file gets locked.  I am using StreamReader to do this.

 

by: ranhellPosted on 2008-12-08 at 07:22:34ID: 23121052

Think out side the box kind of issue

I guess the work arround is to work with the schedule or the call to read the file.
What I mean is try to read the file one by one by each server or program, and avoid having two server reading the file at the same time.

Or create a script to clone\Create copies of the file if the file is being read it or lock.

hope this helps

 

by: YourReferencePosted on 2008-12-08 at 07:50:09ID: 31523293

Good idea.  I will make a copy of the file on the server and read from there.

20120131-EE-VQP-002

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