asked on

Replace a line in a file - Read/Write access posible random How do I do this

im looking to replace a line in a file i wrote a funtion to read the config file im useing and look for a string in it then I want to replace that line it finds with the new string how do I do this im relly stuck.. I keep geeting errors like bad mode and file number/name etc...im relly stuck

here is the code I have so far with error checking
and comments notes for me

I also as you can see tryed in the bottom to do it by stream either way is fine with me I just want it to work

Public Function Write_Config(Line_of_Text As String, Look_For As String)
Dim FileNumber
Dim strFilNam As String
Dim TextLine As String
On Error GoTo ErrorHandler ' Enable error-handling routine.

FileNumber = FreeFile ' Get unused file
strFilNam = App.Path & "\ircd.conf"

Do
Open strFilNam For Random As #FileNumber
'On Error GoTo 0 ' Turn off error trapping.
'On Error Resume Next ' Defer error trapping.

Line Input #FileNumber, TextLine ' Read line into variable.
Debug.Print TextLine ' Print to the Immediate window.

If IsInString(TextLine, Look_For) Then
Print #FileNumber, Line_of_Text
End If
Loop Until EOF(FileNumber) ' Loop until end of file.

Close
Exit Function ' Exit to avoid handler.
ErrorHandler: ' Error-handling routine.
Select Case Err.Number ' Evaluate error number.
Case 52 'Bad file name or number
msg = "Error # " & Str(Err.Number) & " was generated by " _
& Err.Source & Chr(13) _
& Err.Description & Chr(13) _
& "File: " & Chr(13) _
& strFilNam & Chr(13) _
& "File Number is " & FileNumber

MsgBox msg, , "Error", Err.HelpFile, Err.HelpContext
Close
End
Case 55 ' "File already open" error.
Close ' Close open file.
Case Else
Debug.Print Error(Err.Number) ' Print error to Immediate window.

msg = "Error # " & Str(Err.Number) & " was generated by " _
& Err.Source & Chr(13) & Err.Description
MsgBox msg, , "Error", Err.HelpFile, Err.HelpContext

Close
End
End Select
Resume ' Resume execution at same line
' that caused the error.

' #HOut# ********************
' #HOut# Programmer Name : Pern
' #HOut# Date : 3/18/2003
' #HOut# Time : 18:59
' #HOut# Comment :
' #HOut# Comment :
' #HOut# Comment :
' #HOut# ********************
' #Out# Dim a, FS As New FileSystemObject, File As String
' #Out# Close
' #Out# File = App.Path & "\ircd.conf"
' #Out# Set a = FS.OpenTextFile(File, ForAppending, False, TristateFalse)
' #Out# Do
' #Out# frmMain.txtPern.Text = a.ReadLine
' #Out# If IsInString(a.ReadLine, Look_For) Then
' #Out# a.WriteLine Line_of_Text
' #Out# Else: a.SkipLine
' #Out# End If
' #Out# Loop Until a.AtEndOfStream <> True
' #Out# a.Close
' #HOut# ********************
End Function

thanks in advance to any help provided

ASKER CERTIFIED SOLUTION

QJohnson

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Johnny

ASKER

I was able to find an example on exchange (as i was browsing the answers) and moded it to fit my needs...

I thank you for your help in this matter..and the nice explination...
i will award you your points for it..as you did provide a solution and helped...

i have alot of progrmming questions so please look for more from me my next ones about treeview and nodes..

ill post the link here at the bottom for it.

heres what i did to solve the above problem with te search and replace lines... made it a function so i can replace anything i want in the config file..

Public Function Write_Config(Line_of_Text As String, Look_For As String)
On Error GoTo UpdateErr
Dim strFile As String
Dim strTmpFile As String
Dim strLine As String

strFile = App.Path & "\ircd.conf"
strTmpFile = App.Path & "\temp_ircd.conf"

If (Dir(strTmpFile) <> "") Then ' tmp file exist
Kill strTmpFile ' delete the file
End If

Open strFile For Input As #1
Open strTmpFile For Output As #2

' copy until the line you want
Do While (Not EOF(1))
Input #1, strLine
If IsInString(strLine, Look_For) Then
Exit Do
End If
Print #2, strLine
Loop

' write the changed line
Print #2, Line_of_Text

' now write the rest of the file
Do While (Not EOF(1))
Input #1, strLine
Print #2, strLine
Loop

' close open files
Close #2
Close #1

If (Dir(strTmpFile) <> "") Then ' tmp file exist
Kill strFile ' delete the original file
' rename the tmp file as original file
Name strTmpFile As strFile
End If

Exit Function

UpdateErr:
MsgBox "Error updating the file." & vbCrLf & Err.Number & ": " & Err.Description
Reset ' close any open files
On Error GoTo 0
End Function

--------------------------------------------------
Again thanks for your help QJohnson

heres the link for the next problem i have. with treeview and nodes.

https://www.experts-exchange.com/questions/20556122/TreeView-and-Nodes-in-a-read-from-data-to-display.html

Pern

Johnny

ASKER

Thanks again..i didnt grade the answer as A: Excellent!!! as you did not completely give full code..altho i do belive alowing one to figure out th answer in some cases..i really want full code for answers.

you had no way of knowing this and i did not define this befor hand so i didnt deduct anything from awarding...

thanks alot fo the prompt and great answer..

Johnny aka Pern