Import text file to new sheet, do some operations, then close the sheet - vba

Question

I have a problem that I need help to solve. I want to import a text file to a new temporary sheet, find some data, put them in my current sheet and then close the new temporary sheet. Is this possible and how do I do this?

Answer 1

To create a new Worksheet, then remove it:
Option Explicit
Sub openWorkSheet()
Dim ws As Worksheet
Set ws = ThisWorkbook.Worksheets.Add(, ThisWorkbook.ActiveSheet)
End Sub
Sub closeWorkSheet(ByRef ws As Worksheet)
If Not ws Is Nothing Then
With Application
.DisplayAlerts = False
ws.Delete
.DisplayAlerts = True
End With
End If
End Sub
To open a text file, read its contents and find specific strings:
Public Sub searchFile(ByVal filePathAndName As String)
Const TYPICAL_START = "FIRST search string"
Const TYPICAL_END = "LAST search string"
Dim fso As Object
Dim searchedFile As Object
Dim fullFile As String
Dim foundStart As Long
Dim foundEnd As Long
Dim resultArr() As String
Dim i As Long
Set fso = CreateObject("Scripting.FileSystemObject")
Set searchedFile = fso.OpenTextFile(filePathAndName)
fullFile = searchedFile.ReadAll 'read entire file
i = 1
foundStart = 1
foundStart = InStr(foundStart, fullFile, TYPICAL_START, vbTextCompare)
If foundStart > 0 Then
foundEnd = InStr(foundStart, fullFile, TYPICAL_END, vbTextCompare)
While foundStart > 0 And foundEnd > 0
ReDim Preserve resultArr(i)
resultArr(i) = Mid(fullFile, foundStart, foundEnd - foundStart + 1)
foundStart = InStr(foundStart + 1, fullFile, TYPICAL_START, vbTextCompare)
If foundStart > 0 Then foundEnd = InStr(foundStart, fullFile, TYPICAL_END)
i = i + 1
Wend
End If
End Sub

Answer 2

So now it shold work. This is the sub that does not want to work.
Sub Import()
Dim DestBook As Workbook, SourceBook As Workbook
Dim DestCell As Range
Dim RetVal As Boolean
' Set object variables for the active book and active cell.
Set DestBook = ActiveWorkbook
Set DestCell = ActiveCell
' Show the Open dialog box.
RetVal = Application.Dialogs(xlDialogOpen).Show("*.txt", , True)
' If Retval is false (Open dialog canceled), exit the procedure.
If RetVal = False Then Exit Sub
' Set an object variable for the workbook containing the text file.
Set SourceBook = ActiveWorkbook
' Copy the contents of the entire sheet containing the text file.
Range(Range("A1"), Range("A1").SpecialCells(xlLastCell)).Copy
' Activate the destination workbook and paste special the values
' from the text file.
DestBook.Activate
DestCell.PasteSpecial Paste:=xlValues
' Close the book containing the text file.
SourceBook.Close False
End Sub