Function to count number of lines in a text file - scripting

Question

Need a function that will accept a filename as parameter and then return the number of lines in that file.
Should be take under 30 seconds to get the count of a 10 million line file.
Currently have something along the lines of - but it is too slow with large files:
Dim objFSO, strTextFile, strData, arrLines, LineCount
CONST ForReading = 1
'name of the text file
strTextFile = "sample.txt"
'Create a File System Object
Set objFSO = CreateObject("Scripting.FileSystemObject")
'Open the text file - strData now contains the whole file
strData = objFSO.OpenTextFile(strTextFile,ForReading).ReadAll
'Split by lines, put into an array
arrLines = Split(strData,vbCrLf)
'Use UBound to count the lines
LineCount = UBound(arrLines) + 1
wscript.echo LineCount
'Cleanup
Set objFSO = Nothing

Answer 1

If somebody still looking for faster way, here is the code:
Const ForAppending = 8
Set fso = CreateObject("Scripting.FileSystemObject")
Set theFile = fso.OpenTextFile("C:\textfile.txt", ForAppending, Create:=True)
WScript.Echo theFile.Line
Set Fso = Nothing
Of course, the processing time depend very much of the file size, not only of the lines number. Compared with the RegEx method TextStream.Line property is at least 3 times quicker.

Answer 2

The only alternative I see is to read the lines one by one (EDIT: or even just skip them one by one) instead of reading the whole file at once. Unfortunately I can't test which is faster right now. I imagine skipping is quicker.
Dim objFSO, txsInput, strTemp, arrLines
Const ForReading = 1
Set objFSO = CreateObject("Scripting.FileSystemObject")
strTextFile = "sample.txt"
txsInput = objFSO.OpenTextFile(strTextFile, ForReading)
'Skip lines one by one
Do While txsInput.AtEndOfStream <> True
txsInput.SkipLine ' or strTemp = txsInput.ReadLine
Loop
wscript.echo txsInput.Line-1 ' Returns the number of lines
'Cleanup
Set objFSO = Nothing
Incidentally, I took the liberty of removing some of your 'comments. In terms of good practice, they were superfluous and didn't really add any explanatory value, especially when they basically repeated the method names themselves, e.g.
'Create a File System Object
... CreateObject("Scripting.FileSystemObject")

Answer 3

Too large files...
The following is the fastest-effeciently way I know of:
Dim oFso, oReg, sData, lCount
Const ForReading = 1, sPath = "C:\file.txt"
Set oReg = New RegExp
Set oFso = CreateObject("Scripting.FileSystemObject")
sData = oFso.OpenTextFile(sPath, ForReading).ReadAll
With oReg
.Global = True
.Pattern = "\r\n" 'vbCrLf
'.Pattern = "\n" ' vbLf, Unix style line-endings
lCount = .Execute(sData).Count + 1
End With
WScript.Echo lCount
Set oFso = Nothing
Set oReg = Nothing

Answer 4

You could try some variation on this
cnt = 0
Set fso = CreateObject("Scripting.FileSystemObject")
Set theFile = fso.OpenTextFile(filespec, ForReading, False)
Do While theFile.AtEndOfStream <> True
theFile.SkipLine
c = c + 1
Loop
theFile.Close
WScript.Echo c,"lines"

Answer 5

txt = "c:\YourTxtFile.txt"
j = 0
Dim read
Open txt For Input As #1
Do While Not EOF(1)
Input #1, read
j = j + 1
Loop
Close #1
If it adds an empty last line the result is (j - 1).
It works fine for one column in the txt file.

Answer 6

How to count all lines in the notepad
Answers:
=> Below is the code -
Set t1=createObject("Scripting.FileSystemObject")
Set t2=t1.openTextFile ("C:\temp\temp1\temp2_VBSCode.txt",1)
Do Until t2.AtEndOfStream
strlinenumber = t2.Line
strLine = t2.Readline
Loop
msgbox strlinenumber
t2.Close

Answer 7

I was looking for a faster way than what I already had to determine the number of lines in a text file. I searched the internet and came across 2 promising solution. One was a solution based on SQL thew other the solution I found here based on Fso by Kul-Tigin. I tested them and this is part of the result:
Number of lines Time elapsed Variant
--------------------------------------------------------
110 00:00:00.70 SQL
110 00:00:00.00 Vanilla VBA (my solution)
110 00:00:00.16 FSO
--------------------------------------------------------
1445014 00:00:17.25 SQL
1445014 00:00:09.19 Vanilla VBA (my solution)
1445014 00:00:17.73 FSO
I ran this several times with large and small numbers. Time and again the vanilla VBA came out on top. I know this is far out of date, but for anyone still looking for the fastest way to determine the number of lines in a csv/text file, down here's the code I use.
Public Function GetNumRecs(ASCFile As String) As Long
Dim InStream As Long
Dim Record As String
InStream = FreeFile
GetNumRecs = 0
Open ASCFile For Input As #InStream
Do While Not EOF(InStream)
Line Input #InStream, Record
GetNumRecs = GetNumRecs + 1
Loop
Close #InStream
End Function