Looping Macro in Excel - vba

Question

I would like to loop through an Excel worksheet and to store the values based on a unique ID in a text file.
I am having trouble with the loop and I have done research on it with no luck and my current nested loop continually overflows. Instead of updating the corresponding cell when the control variable is modified, it continues to store the initial Index value for all 32767 iterations.
Please can someone explain why this is happening, and provide a way of correcting it?.
Sub SortLetr_Code()
'sort columns for Letr_Code files
Dim lr As Long
Application.ScreenUpdating = False
lr = Cells(Rows.Count, 1).End(xlUp).Row
Range("A2:B" & lr).Sort key1:=Range("B2"), order1:=1
Application.ScreenUpdating = True
'Value of cell for example B1 starts out as X
Dim x As Integer
Dim y As Integer
x = 2
y = 2
'Cell References
Dim rwCounter As Range
Dim rwCorresponding As Range
Dim rwIndexValue As Range
Dim rwIndexEnd As Range
Dim rwIndexStore As Range
'Variables for files that will be created
Dim FilePath As String
Dim Filename As String
Dim Filetype As String
'Variables defined
FilePath = "C:\Users\Home\Desktop\SURLOAD\"
Filetype = ".dat"
'Use Cell method for Loop
rwIndex = Cells(x, "B").Value
Set rwCounter = Range("B" & x)
'Use Range method for string manipulation
Set rwCorresponding = Range("A" & x)
Set rwIndexValue = Range("B" & y)
Set rwIndexStore = Range("B" & x)
Set rwIndexEnd = Range("B:B").End(xlUp)
'Objects for creating the text files
Dim FileCreate As Object
Set FileCreate = CreateObject("Scripting.FileSystemObject")
'Object for updating the file during the loop
Dim FileWrite As Object
For Each rwIndexStore In rwIndexEnd.Cells
'Get Substring of cell value in BX for the file name
Do Until IsEmpty(rwCounter)
Filename = Mid$(rwIndexValue, 7, 5)
Set FileWrite = FileCreate.CreateTextFile(FilePath + Filename + Filetype)
'Create the file
FileWrite.Write (rwCorresponding & vbCrLf)
Do
'Add values to the textfile
x = x + 1
FileWrite.Write (rwCorresponding & vbCrLf)
Loop While rwCounter.Value Like rwIndexValue.Value
'Close this file
FileWrite.Close
y = x
Loop
Next rwIndexStore
End Sub

Answer 1

I don't see a place you are setting rwCounter inside the loop.
It looks like it would stay on range("B2") and x would just continue to increase until it hits an error, either at the limit of integer or long.
add Set rwCounter = Range("B" & x) somewhere inside your loop to increment it

Answer 2

This is the solution.
Sub GURMAIL_File()
'sort columns for Letr_Code files
Dim lr As Long
Application.ScreenUpdating = False
lr = Cells(Rows.Count, 1).End(xlUp).Row
Range("A2:B" & lr).Sort key1:=Range("B2"), order1:=1
Application.ScreenUpdating = True
'Variables that store cell number
Dim Corresponding As Integer
Dim Index As Integer
Dim Counter As Integer
Corresponding = 2
Index = 2
Counter = 2
'Cell References
Dim rwIndexValue As Range
'Variables for files that will be created
Dim l_objFso As Object
Dim FilePath As String
Dim Total As String
Dim Filename As String
Dim Filetype As String
Dim FolderName As String
'Variables defined
FilePath = "C:\Users\Home\Desktop\SURLOAD\"
'Name of the folder to be created
FolderName = Mid$(ActiveWorkbook.Name, 9, 8) & "\"
'Folder path
Total = FilePath & FolderName
'File Extension
Filetype = ".dat"
'Object that creates the folder
Set l_objFso = CreateObject("Scripting.FileSystemObject")
'Objects for creating the text files
Dim FileCreate As Object
Set FileCreate = CreateObject("Scripting.FileSystemObject")
'Object for updating the file during the loop
Dim FileWrite As Object
'Get Substring of letter code in order to name the file. End this loop once ID field is null.
Do While Len(Range("A" & Corresponding)) > 0
'Create the directory if it does not exist
If Not l_objFso.FolderExists(Total) Then
l_objFso.CreateFolder (Total)
End If
'Refence to cell containing a letter code
Set rwIndexValue = Range("B" & Index)
'Substring of that letter code
Filename = Mid$(rwIndexValue, 7, 5)
'Create the file using the substring and store it in the proper location
Set FileWrite = FileCreate.CreateTextFile(Total + Filename + Filetype, True)
'For each letter code, find the corresponding values. End the loop once the last value for the letter code is stored.
Do While Range("B" & Index) Like Range("B" & Counter)
'Add each line to the text file.
FileWrite.WriteLine (Range("A" & Corresponding))
'Incrementer variables that allow you to exit the loop
'if you have reached the last value of the current letter code.
Corresponding = Corresponding + 1
Counter = Counter + 1
Loop
'Close the file you were writing to
FileWrite.Close
'Make sure that Index value is updated to the next letter code
Index = Counter
'In case Index value needs updating (safeguard to make sure that the new letter code is stored to index value).
Set rwIndexValue = Range("B" & Index)
Loop
End Sub