We help IT Professionals succeed at work.

editing a text file

168 Views
Last Modified: 2012-05-07
Hello all

I have an application that reads a text file, i now have a set of circumstances whereby i need to change the text of the file on the fly from within my appication. I read the file as follows
"           If IO.File.Exists("C:\somthing.txt") Then
                Dim srCon As IO.StreamReader
                srCon = New System.IO.StreamReader(("C:\somthing.txt")
                While srCon.Peek <> -1
                    strLine = srCon.ReadLine
                    If strLine.StartsWith("server") Then
                        strLine = strLine.Substring(7)
                        strSrv = Trim(strLine)
                    ElseIf strLine.StartsWith("database") Then
                        strLine = strLine.Substring(9)
                        strDB = Trim(strLine)
                    ElseIf strLine.StartsWith("company") Then
                        strLine = strLine.Substring(8)
                        strSagepath = Trim(strLine)
                    ElseIf strLine.StartsWith("license") Then
                        strLine = strLine.Substring(8)
                        strLicense = Trim(strLine)
                    ElseIf strLine.StartsWith("printer1") Then
                        strLine = strLine.Substring(9)
                        strprinter1 = Trim(strLine)
                    ElseIf strLine.StartsWith("printer2") Then
                        strLine = strLine.Substring(9)
                        strprinter2 = Trim(strLine)
                    ElseIf strLine.StartsWith("printer3") Then
                        strLine = strLine.Substring(9)
                        strprinter3 = Trim(strLine)
                    End If  "

I know the lines i need to edit so i can do somthing like "If strLine.StartsWith("printer3") Then"
How can i edit the rest of that line after printer3
Comment
Watch Question

Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION
that file looks almost like an INI file - make a couple of changes (stick "=" between the param name & value and give the file a section header "[SectionName]") and you could just use an INI file reader like this one http://www.mentalis.org/soft/class.qpx?id=6 - makes your job a whole lot easier than parsing each line in the file until you get to the line you want.

Or convert it to XML and use the .Net XML classes.

If you do use a streamwriter to write back to the file - remember that you will need to write back the entire contents of the file not just the line you are changing. So for even a small change you will have to read in every line of the file.

Author

Commented:
Thank you
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a sample view!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.