Function to count number of lines in a text file

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 m

Answer 1

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 I know this is far out of date, but for anyone still looking for the fastest way to determine the number of lines in a csv/text file, down here's the code I use.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