Read and write into a file using VBScript - vbscript

Question

How can we read and write some string into a text file using VBScript? I mean I have a text file which is already present so when I use this code below:-
Set fso = CreateObject("Scripting.FileSystemObject" )
Set file = fso.OpenTextFile("C:\New\maddy.txt",1,1)
This opens the file only for reading but I am unable to write anything
and when I use this code:-
Set fso = CreateObject("Scripting.FileSystemObject" )
Set file = fso.OpenTextFile("C:\New\maddy.txt",2,1)
I can just use this file for writing but unable to read anything. Is there anyway by which we can open the file for reading and writing by just calling the OpenTextFile method only once.
I am really new to VBScript. I am only familiar with C concepts.
Is there any link to really get me started with VBScript?
I guess I need to have a good knowledge of the objects and properties concepts.

Answer 1

You can create a temp file, then rename it back to original file:
Set objFS = CreateObject("Scripting.FileSystemObject")
strFile = "c:\test\file.txt"
strTemp = "c:\test\temp.txt"
Set objFile = objFS.GetFile(strFile)
Set objOutFile = objFS.CreateTextFile(strTemp,True)
Set ts = objFile.OpenAsTextStream(1,-2)
Do Until ts.AtEndOfStream
strLine = ts.ReadLine
' do something with strLine
objOutFile.Write(strLine)
Loop
objOutFile.Close
ts.Close
objFS.DeleteFile(strFile)
objFS.MoveFile strTemp,strFile
Usage is almost the same using OpenTextFile:
Set objFS = CreateObject("Scripting.FileSystemObject")
strFile = "c:\test\file.txt"
strTemp = "c:\test\temp.txt"
Set objFile = objFS.OpenTextFile(strFile)
Set objOutFile = objFS.CreateTextFile(strTemp,True)
Do Until objFile.AtEndOfStream
strLine = objFile.ReadLine
' do something with strLine
objOutFile.Write(strLine & "kndfffffff")
Loop
objOutFile.Close
objFile.Close
objFS.DeleteFile(strFile)
objFS.MoveFile strTemp,strFile

Answer 2

Find more about the FileSystemObject object at http://msdn.microsoft.com/en-us/library/aa242706(v=vs.60).aspx. For good VBScript, I recommend:
Option Explicit to help detect typos in variables.
Function and Sub to improve readilbity and reuse
Const so that well known constants are given names
Here's some code to read and write text to a text file:
Option Explicit
Const fsoForReading = 1
Const fsoForWriting = 2
Function LoadStringFromFile(filename)
Dim fso, f
Set fso = CreateObject("Scripting.FileSystemObject")
Set f = fso.OpenTextFile(filename, fsoForReading)
LoadStringFromFile = f.ReadAll
f.Close
End Function
Sub SaveStringToFile(filename, text)
Dim fso, f
Set fso = CreateObject("Scripting.FileSystemObject")
Set f = fso.OpenTextFile(filename, fsoForWriting)
f.Write text
f.Close
End Sub
SaveStringToFile "f.txt", "Hello World" & vbCrLf
MsgBox LoadStringFromFile("f.txt")

Answer 3

You could open two textstreams, one for reading
Set filestreamIn = CreateObject("Scripting.FileSystemObject").OpenTextFile("C:\Test.txt,1)
and one for appending
Set filestreamOUT = CreateObject("Scripting.FileSystemObject").OpenTextFile("C:\Test.txt,8,true)
The filestreamIN can read from the begining of the file, and the filestreamOUT can write to the end of the file.

Answer 4

Don't think so...you can only use openTextFile for reading (1), writing (2), or appending (8). Reference here.
If you were using VB6 instead of VBScript, you could do:
Open "Filename" [For Mode] [AccessRestriction] [LockType] As #FileNumber
Using the Random mode. For example:
Open "C:\New\maddy.txt" For Random As #1

Answer 5

You could put it in an Excel sheet, idk if it'll be worth it for you if its needed for other things but storing info in excel sheets is a lot nicer because you can easily read and write at the same time with the
'this gives you an excel app
oExcel = CreateObject("Excel.Application")
'this opens a work book of your choice, just set "Target" to a filepath
oBook = oExcel.Workbooks.Open(Target)
'how to read
set readVar = oExcel.Cell(1,1).value
'how to write
oExcel.Cell(1,2).value = writeVar
'Saves & Closes Book then ends excel
oBook.Save
oBook.Close
oExcel.Quit
sorry if this answer isnt helpful, first time writing an answer and just thought this might be a nicer way for you

Answer 6

You could also read the entire file in, and store it in an array
Set filestreamIN = CreateObject("Scripting.FileSystemObject").OpenTextFile("C:\Test.txt",1)
file = Split(filestreamIN.ReadAll(), vbCrLf)
filestreamIN.Close()
Set filestreamIN = Nothing
Manipulate the array in any way you choose, and then write the array back to the file.
Set filestreamOUT = CreateObject("Scripting.FileSystemObject").OpenTextFile("C:\Test.txt",2,true)
for i = LBound(file) to UBound(file)
filestreamOUT.WriteLine(file(i))
Next
filestreamOUT.Close()
Set filestreamOUT = Nothing

Answer 7

Regardless of what you're trying to do there should be no need to read to and write to a file at the same time. It would also use more memory which should always be avoided. I'd suggest reading the entire file using the .ReadAll method and then close it and do whatever you need to do with the data (assuming you read the contents into a variable) and then do a write to the same file and overwrite the file. If you're concerned with having something go wrong when over-writing the current file you could always try to write it to a different file and throw an error if that doesn't work before trying to over-write the original.

Answer 8

Below is some simple code to execute this:
sLocation = "D:\Excel-Fso.xls"
sTxtLocation = "D:\Excel-Fso.txt"
Set ObjExl = CreateObject("Excel.Application")
Set ObjWrkBk = ObjExl.Workbooks.Open(sLocation)
Set ObjWrkSht = ObjWrkBk.workSheets("Sheet1")
ObjExl.Visible = True
Set FSO = CreateObject("Scripting.FileSystemObject")
Set FSOFile = FSO.CreateTextFile (sTxtLocation)
sRowCnt = ObjWrkSht.usedRange.Rows.Count
sColCnt = ObjWrkSht.usedRange.Columns.Count
For iLoop = 1 to sRowCnt
For jLoop = 1 to sColCnt
FSOFile.Write(ObjExl.Cells(iLoop,jLoop).value) & vbtab
Next
Next
Set ObjWrkBk = Nothing
Set ObjWrkSht = Nothing
Set ObjExl = Nothing
Set FSO = Nothing
Set FSOFile = Nothing

Answer 9

This is for create a text file
For i = 1 to 10
createFile( i )
Next
Public Sub createFile(a)
Dim fso,MyFile
filePath = "C:\file_name" & a & ".txt"
Set fso = CreateObject("Scripting.FileSystemObject")
Set MyFile = fso.CreateTextFile(filePath)
MyFile.WriteLine("This is a separate file")
MyFile.close
End Sub
And this for read a text file
Dim fso
Set fso = CreateObject("Scripting.FileSystemObject")
Set dict = CreateObject("Scripting.Dictionary")
Set file = fso.OpenTextFile ("test.txt", 1)
row = 0
Do Until file.AtEndOfStream
line = file.Readline
dict.Add row, line
row = row + 1
Loop
file.Close
For Each line in dict.Items
WScript.Echo line
WScript.Sleep 1000
Next