create new formula using vba excel - excel

Hi im looking for a formulla to show User's full name who is opening excel file.it should show that logged in user name. I tried some VBA script and got succesfull but there is one problem that when i run script that time only it Generate pop up windows saying your user name. it should show user name in cell as a date formulla a"=TODAY()". i have this script please anybody help me to show full user name in cell.
Sub GetUserFullName()
Dim MyOBJ As Object
On Error Resume Next
Set MyOBJ = GetObject("WinMgmts:").instancesOf("Win32_NetworkLoginProfile")
If Err.Number <> 0 Then
MsgBox "WMI has not been installed, code will be terminated...", vbExclamation, "Windows Management Instrumentation"
Exit Sub
End If
For Each objItem In MyOBJ
MyMsg = MyMsg & "Welcome To IT Dept : " & vbCrLf & vbCrLf & objItem.FullName
Next
MsgBox MyMsg, vbInformation, "Swapnil (System Admin)"
End Sub

UPD:
Function GetUserFullName() As String
Dim MyOBJ As Object
Dim res As String
On Error Resume Next
Set MyOBJ = GetObject("WinMgmts:").instancesOf("Win32_NetworkLoginProfile")
If Err.Number <> 0 Then
GetUserFullName = "error"
Exit Function
End If
For Each objItem In MyOBJ
res = res & objItem.FullName
Next
GetUserFullName = res
End Function
you can use it in any cell like formula: =GetUserFullName()

Related

Excel macro to insert a value into mutiple excel files

hope you're fine,
i want a macro to read multiple excel files and insert a value in specific cell ( for example C3 or A1 or any cell declared in the code)
here firs image of my code, just a button
and here is my code:
Sub InsertValueInCell()
Range("C3").Value = _
InputBox(Prompt:="Enter the value you want to insert.")
End Sub
this code give me this result right now, it's just insert the data in the actual workbook :
TEST-1
TEST-2
Thanks in advance to help me to complete the code cause i want the code to read multiple excel files and after that i can insert a value in specific cell for all thos excel files.
Thanks in advance
Have a good day All
here is my code for the moment:
Sub InsertValueInCell()
Range("C3").Value = _
InputBox(Prompt:="Enter the value you want to insert.")
End Sub
this code give me this result right now, it's just insert the data in the actual workbook :
TEST-1
TEST-2
Thanks in advance to help me to complete the code cause i want the code to read multiple excel files and after that i can insert a value in specific cell for all those excel files (for example i want to insert a value in the C3 cell for all those excel files).
Thanks in advance
Have a good day All
This should work for you:
Option Explicit 'Must be at very top of module, before any procedures.
'Possibly the most important line in any code - forces you to declare your variables.
Public Sub AddValueToSheet()
On Error GoTo ERROR_HANDLER
'The Sheet to changed.
Dim SheetName As String
SheetName = "Sheet1"
'Get a collection of files within the folder.
Dim FileCollection As Collection
Set FileCollection = New Collection
Set FileCollection = EnumerateFiles("<folder path>\") 'Don't forget the final backslash.
Dim ValueToEnter As String 'or whatever type you're trying to enter.
ValueToEnter = InputBox("Enter the value you want to insert")
'Look at each item in the collection.
Dim wrkBkPath As Variant
For Each wrkBkPath In FileCollection
'Open the workbook.
Dim wrkBk As Workbook
Set wrkBk = Workbooks.Open(wrkBkPath)
'Check if the sheet exists.
'Add the value if it does, add the file name to the MissingSheetList string if it doesn't.
Dim MissingSheetList As String
If SheetExists(wrkBk, SheetName) Then
wrkBk.Worksheets(SheetName).Range("A1") = ValueToEnter
Else
MissingSheetList = MissingSheetList & wrkBk.Name & vbCrLf
End If
'Save and close.
wrkBk.Close SaveChanges:=True
Next wrkBkPath
'Display missing sheet list message if there's any.
If MissingSheetList <> "" Then
MsgBox "The files were missing " & SheetName & vbCr & vbCr & MissingSheetList, vbInformation + vbOKOnly
End If
Exit Sub
'If an error occurs code skips to this section.
ERROR_HANDLER:
Dim ErrMsg As String
ErrMsg = "AddValueToSheet()" & vbCr & Err.Description
'Add error handling code.
Select Case Err.Number
Case Else
End Select
End Sub
'Check if a sheet exists by trying to set a reference to it.
Private Function SheetExists(wrkBk As Workbook, SheetName As String) As Boolean
On Error Resume Next
Dim ShtRef As Worksheet
Set ShtRef = wrkBk.Worksheets(SheetName)
SheetExists = (Err.Number = 0) 'Was an error returned? True or False.
On Error GoTo 0
End Function
'Returns all xls* files from the path supplied by sDirectory.
'Each file path is added to the FilePaths collection.
Private Function EnumerateFiles(ByVal sDirectory As String) As Collection
On Error GoTo ERROR_HANDLER
'You can remove StatusBar lines if you want - code might run too fast to see anyway.
Application.StatusBar = "Collating files: " & sDirectory 'Update status bar.
Dim cTemp As Collection
Set cTemp = New Collection
Dim sTemp As String
sTemp = Dir$(sDirectory & "*.xls*")
Do While Len(sTemp) > 0
cTemp.Add sDirectory & sTemp
sTemp = Dir$
Loop
Set EnumerateFiles = cTemp
Application.StatusBar = False 'Reset status bar.
Exit Function
'If an error occurs code skips to this section.
ERROR_HANDLER:
Dim ErrMsg As String
ErrMsg = "EnumerateFiles()" & vbCr & Err.Description
'Add error handling code.
Select Case Err.Number
Case Else
End Select
End Function

Late bound MSForms.DataObject works in VBA but only partially in VBScript

I sometimes use the MSForms.DataObject object from the Microsoft Forms 2.0 Object Library in Excel VBA. It is absolutely wonderful for reading / writing text data from / to the clipboard. Recently, I stumbled across this article which shows how to instantiate the object using late binding and found that it works beautifully in VBA. Now, I don't have to worry about adding the reference library each time I port my code to new projects.
That discovery made me wonder if it were possible to use the same object in VBScript. There have been several instances in the past when I wanted to manipulate the clipboard with VBScript but all my research at the time indicated that it wasn't possible (aside from using internet explorer, mshta, clip, etc). To my surprise, the DataObject worked exactly as expected when I tried to read the clibboard. However, it would not put data back into the clipboard and threw an error which makes no sense to me. Below are the details.
Error Number: -2147221008 (800401F0)
Error Description: DataObject:PutInClipboard CoInitialize has not been called.
So, is there a workaround for the error I'm getting or is it simply part of the same VBScript limitation described on MSDN and this answer?
Here is the VBScript code I used for testing on my 64 bit Windows 7 PC:
Option Explicit
Dim DObj
Sub TestClipboard()
Dim ClipData
VerifyArchitecture
If Not InitClipboardObject Then
Terminate "Unable to initialize the clipboard object"
ElseIf Not ClipboardPaste(ClipData) Then
Terminate "Unable to retrieve the clipboard data"
End If
' The message box will have the current clipboard text (if any exist)
MsgBox "The clipboard contains the following text:" & _
vbCrLf & vbCrLf & ClipData
ClipData = "Text we put in the clipboard"
' However, this function will not succeed.
If Not ClipboardCopy(ClipData) Then Terminate "Unable to put data into the clipboard"
End Sub
Function InitClipboardObject()
On Error Resume Next
' If the code is run in VBA, the following reference library
' can be used as an alternative to late binding:
' Microsoft Forms 2.0 Object Library
' Note: The reference library will not show up on the
' list unless a userform has already been added in Excel.
' If not, browse for the FM20.DLL file
Set DObj = GetObject("new:{1C3B4210-F441-11CE-B9EA-00AA006B1A69}")
InitClipboardObject = Err = 0
End Function
' Put data in the clipboard similar to pressing Ctrl + C
Function ClipboardCopy(ByVal Data)
On Error Resume Next
DObj.SetText Data
' This line of code will throw the following error
' Error Number: -2147221008 (800401F0)
' Description: DataObject:PutInClipboard CoInitialize has not been called.
' However, it works perfectly in VBA
DObj.PutInClipboard
ClipboardCopy = Err = 0
End Function
' Retrieve data from the clipboard similar to pressing Ctrl + V
Function ClipboardPaste(ByRef Data)
On Error Resume Next
DObj.GetFromClipboard
Data = DObj.GetText(1)
ClipboardPaste = Err = 0
End Function
' This sub will re-load the script using the 32 bit host
' if it is loaded on the 64 bit version. This is necessary
' since the clipboard object is 32 bit.
Sub VerifyArchitecture()
' The code in this sub is a modified version of Vozzie's answer
' and I do not take credit for the idea:
' https://stackoverflow.com/a/15320768/2734431
Dim Arch, Arg, Args, Cmd, ExeFullName, ExeShortName
Dim Path32, Path64, ProcEnv, q, Reload, ScriptName
Dim WinDir, WShell
q = Chr(34)
Reload = False
ExeFullName = WScript.FullName
ScriptName = WScript.ScriptFullName
ExeShortName = Mid(ExeFullName, InStrRev(ExeFullName, "\") + 1)
Set WShell = CreateObject("WScript.Shell")
Set ProcEnv = WShell.Environment("Process")
WinDir = ProcEnv("windir") & "\"
Path32 = WinDir & "SysWOW64\"
Path64 = WinDir & "System32\"
Arch = ProcEnv("PROCESSOR_ARCHITECTURE")
For Each Arg In WScript.Arguments
Args = " " & q & Arg & q
Next
Cmd = q & Path32 & ExeShortName & q & " " & q & ScriptName & q & Args
If InStr(LCase(ExeFullName), LCase(Path64)) <> 0 And Arch = "AMD64" Then
Reload = True
WShell.Run Cmd
End If
Set WShell = Nothing
Set ProcEnv = Nothing
If Reload Then Terminate ""
End Sub
' This sub is designed to clear any global variables, optionally
' display an error message, and stop the script
Sub Terminate(ByVal ErrMsg)
Dim ErrNbr
Set DObj = Nothing
If ErrMsg <> "" Then
ErrNbr = "Error"
If Err <> 0 Then
ErrNbr = ErrNbr & " " & Err & " (" & Hex(Err) & ")"
ErrMsg = ErrMsg & vbCrLf & vbCrLf
ErrMsg = ErrMsg & "Code Error: " & Err.Description
End If
' &H10 = vbCritical
MsgBox ErrMsg, &H10, ErrNbr
End If
WScript.Quit
End Sub

Automation Error on "VBProject.VBComponents"- VBA (Excel)

I have this code:
Sub ChangeImportedBOQCodeName(importedName As String)
ActiveWorkbook.VBProject.VBComponents(ActiveSheet.CodeName).Name = "BOQ_" & importedName
End Sub
That is called from
Private Sub cmdOK_Click()
Dim TargetName As String
TargetName = cbxSheets.Text
Set TargetSheet = TargetWB.Sheets(TargetName)
TargetSheet.Copy After:=SourceWB.Sheets(SourceSheet.Index)
ChangeImportedBOQCodeName ActiveSheet.CodeName
' Close the User Form
Unload Me
' Inform User on Successful BOQ Import
MsgBox "The selected BOQ was successfully imported to the Analysis", vbInformation, "Import Successful"
' Ask User to generate codes automatically
Dim msgTxt As String
msgTxt = "Generate codes in the imported BOQ, automatically ?" & vbNewLine & vbNewLine & _
"(The proccess may take a while depending on the System specs and BOQ layout and size)"
If MsgBox(msgTxt, vbYesNo, "Auto Code BOQ") = vbYes Then
CheckImportedBOQ ActiveSheet
Else
MsgBox "Auto code genrate was aborted", vbInformation, "Aborted"
End If
End Sub
But I am getting this error:
Run-time error '-2147417848 (80010108)' Automation error The object
invoked has disconnected from its client
And excel exits abruptly.
Problem is that this error never occurred before and the code was working very fine.
I also tried commenting ChangeImportedBOQCodeName ActiveSheet.CodeName this line and the code works.
In your Sub ChangeImportedBOQCodeName you are passing ActiveSheet.CodeName, so all you need to do is change:
ActiveWorkbook.VBProject.VBComponents(ActiveSheet.CodeName).Name = "BOQ_" & importedName
To:
ActiveWorkbook.VBProject.VBComponents(importedName).Name = "BOQ_" & importedName

Trouble referencing sheet code names

Here's the basic problem: I am writing an Excel macro and I would like to use the worksheet code names to try to eliminate any errors down the road. I can use the code name for Sheet1 and it works fine, but when I try to use the other codes, like Sheet3 or Sheet7 the editor doesn't recognize them and if I run the macro Excel kicks up an error telling me that my "variable is not defined".
For example:
Option Explicit
Sub Test()
Dim SheetObject As Worksheet
Dim SheetObject2 As Worksheet
Set SheetObject = Sheet1
Set SheetObject2 = Sheet3
MsgBox (SheetObject.Name)
MsgBox (SheetObject2.Name)
End Sub
If I comment out any code referring to SheetObject2 the macro runs correctly. If I put them in I get the errors. I definitely have a Sheet3, and the code name is definitely Sheet3. I've looked around Google all day and can't seem to come up with any solutions, any help would be great.
Thanks in advance,
Jesse
My last employer collected data and created national statistics. Much of that data came in the form of Excel workbooks so I have had a lot of relevant experience.
If you are running your own macro and if this is a one-off exercise then tests like this may be adequate:
Debug.Assert WbookTgt.WsheetTgt.Range("A1").Value = "Date"
Many languages have an Assert statement as a development aid; this is the VBA version. If the assertion is not true, the macro will stop with this statement highlighted.
If this approach is not adequate, you should consider developing parameterised macros that perform checking and updating tasks. I have looked through some of my old macros but most would not be intelligible to someone new to VBA. I have extracted code to create two macros which I hope will give you some ideas.
Macro 1 - OpenWorkbook
Organisations that regularly supply data often use names like: "Xxxxx 1409.xlsx" and "Xxxxx 1410.xlsx" for the September and October versions of their data. You could, for example, update the macro each month for the latest name or you could change the filename to a standard value. Either of these possibilities would be a nuisance and I would be particularly opposed to the second idea because I like to archive all the workbooks I have processed.
OpenWorkbook() uses the Dir statement to search a folder for a file that matches a template such as “Xxxxx*.xls*”. If a single file matches this template, the macro opens the workbook and returns a reference to it.
Macro 2 – CheckWorksheets
You may have noticed that some VBA routines have a fixed number of parameters while others have a variable number of parameters. For example, the following are all valid calls of CheckWorksheets:
If CheckWorksheets(WbookTgt, WbookThis, “Name1”) then
If CheckWorksheets(WbookTgt, WbookThis, “Name1”, “Name2”) then
If CheckWorksheets(WbookTgt, WbookThis, “Name1”, “Name2”, “Name3”) then
CheckWorksheets has three parameters. The first two are workbook references. The third is ParamArray SheetName() As Variant. Any parameter after the first two is placed in array SheetName which can be as large as necessary. Here all the trailing parameters are strings but they could be of any type.
I can use OpenWorkbook to open this month’s version of the source file and then use CheckWorksheets to confirm all the worksheets required by my macro are present.
Worksheet Errors”
These two macros require a worksheet Errors be present in a specified workbook. If the macros detect an error, they add a detailed error message to this worksheet. I have found this a convenient technique for capturing the details of any errors.
Macros Demo1 and Demo2
I have included two macros that demonstrate the use of these macros with workbooks on my system. If you amend Demo1 and Demo2 to operate on some of your workbooks, you should get an idea of what OpenWorkbook and CheckWorksheets can do for you.
Come back with questions as necessary but the more you can decipher OpenWorkbook and CheckWorksheets yourself, the faster you will develop your own skills
Option Explicit
Sub Demo1()
Dim Path As String
Dim WbookThis As Workbook
Dim WbookTgt As Workbook
' Application.ThisWorkbook identifies the workbook containing this macro.
Set WbookThis = Application.ThisWorkbook
' I find it convenient to place my target workbooks in the folder
' holding the workbook containing the macro(s).
Path = WbookThis.Path
Set WbookTgt = OpenWorkbook(Path, "Combined*.xls*", WbookThis)
If WbookTgt Is Nothing Then
' Detailed error message already recorded in "Errors"
Call MsgBox("Wokbook failed checks", vbOKOnly)
Else
With WbookTgt
Debug.Print .Path & "\" & .Name & " opened."
.Close SaveChanges:=False
End With
End If
End Sub
Sub Demo2()
Dim Path As String
Dim WbookThis As Workbook
Dim WbookTgt As Workbook
' Application.ThisWorkbook identifies the workbook containing this macro.
Set WbookThis = Application.ThisWorkbook
' I find it convenient to place my target workbooks in the folder
' holding the workbook containing the macro(s).
Path = WbookThis.Path
Set WbookTgt = OpenWorkbook(Path, "Combined 2.04.xls*", WbookThis)
If WbookTgt Is Nothing Then
' Detailed error message already recorded in "Errors"
Call MsgBox("Wokbook failed checks", vbOKOnly)
Exit Sub
End If
With WbookTgt
If Not CheckWorksheets(WbookTgt, WbookThis, "Critical Path", "Dyn Dims") Then
Call MsgBox("Wokbook failed checks", vbOKOnly)
.Close SaveChanges:=False
Exit Sub
End If
Debug.Print .Path & "\" & .Name & " contains worksheets Critical and Dym Dims"
.Close SaveChanges:=False
End With
End Sub
Function CheckWorksheets(ByRef WbookTgt As Workbook, ByRef WbookError As Workbook, _
ParamArray SheetName() As Variant) As Boolean
' * Return True if WbookTgt contains every specified worksheet.
' * WbookTgt is the workbook to be checked
' * WbookError identifies the workbook containing worksheet "Error" to which any
' error message will be added.
' * SheetName() is an array of worksheet names.
Dim ErrorMsg As String
Dim FoundError As Boolean
Dim FoundSheet() As Boolean
Dim FoundSheetsCount As Long
Dim InxName As Long
Dim InxWsheet As Long
Dim NotFoundSheetsCount As Long
Dim RowErrorNext As Long
Dim SheetNamesFound As String
' Size FoundSheet to match SheetName. Array elements initialised to False
ReDim FoundSheet(LBound(SheetName) To UBound(SheetName))
FoundSheetsCount = 0
NotFoundSheetsCount = 0
With WbookTgt
For InxName = LBound(SheetName) To UBound(SheetName)
NotFoundSheetsCount = NotFoundSheetsCount + 1 ' Assume not found until found
For InxWsheet = 1 To .Worksheets.Count
If SheetName(InxName) = .Worksheets(InxWsheet).Name Then
FoundSheet(InxName) = True
FoundSheetsCount = FoundSheetsCount + 1
NotFoundSheetsCount = NotFoundSheetsCount - 1
Exit For
End If
Next
Next
End With
If NotFoundSheetsCount = 0 Then
CheckWorksheets = True
Exit Function
End If
SheetNamesFound = ""
ErrorMsg = WbookTgt.Path & "\" & WbookTgt.Name & " does not contain "
If NotFoundSheetsCount = 1 Then
ErrorMsg = ErrorMsg & "this expected worksheet:"
Else
ErrorMsg = ErrorMsg & "these expected worksheets:"
End If
For InxName = LBound(SheetName) To UBound(SheetName)
If Not FoundSheet(InxName) Then
ErrorMsg = ErrorMsg & vbLf & " " & SheetName(InxName)
Else
SheetNamesFound = SheetNamesFound & vbLf & " " & SheetName(InxName)
End If
Next
If FoundSheetsCount = 0 Then
' No need to add list of found sheet names
Else
ErrorMsg = ErrorMsg & vbLf & "but does contain "
If FoundSheetsCount = 1 Then
ErrorMsg = ErrorMsg & "this expected worksheet:"
Else
ErrorMsg = ErrorMsg & "these expected worksheets:"
End If
ErrorMsg = ErrorMsg & SheetNamesFound
End If
With WbookError
With .Worksheets("Errors")
RowErrorNext = .Cells(Rows.Count, "A").End(xlUp).Row + 1
With .Cells(RowErrorNext, "A")
.Value = Now()
.VerticalAlignment = xlTop
End With
.Cells(RowErrorNext, "B").Value = ErrorMsg
End With
End With
CheckWorksheets = False
End Function
Function OpenWorkbook(ByVal Path As String, ByVal FileTemplate As String, _
ByRef WbookError As Workbook) As Workbook
' * If Path & FileTemplate identifies a single workbook, open it and return
' it as an object. If Path & FileTemplate does not represent a single
' workbook, report the problem in worksheet Errors and return Nothing.
' * WbookError identifies the workbook containing worksheet "Error".
' * Path must be the name of the folder in which the required workbook is located
' * FileTemplate can either be a specific filename or can contain wild cards
' providing only one file matches the template.
' * WbookError identifies the workbook containing worksheet "Error" to which any
' error message will be added.
Dim ErrorMsg As String
Dim FileNameCrnt As String
Dim FileNameMatch As String
Dim RowErrorNext As Long
FileNameMatch = Dir$(Path & "\" & FileTemplate, vbNormal)
If FileNameMatch = "" Then
' No matches found
ErrorMsg = "Template " & Path & "\" & FileTemplate & " does not match any file"
Else
' At least one match.
' If only one match, its name is in FileNameMatch
Do While True
FileNameCrnt = Dir$
If FileNameCrnt = "" Then
' No more matches
Exit Do
End If
' A second or subsequent match has been found.
If FileNameMatch <> "" Then
' This is the second match.
' Initialise error message and report name of first match
ErrorMsg = "Template " & Path & "\" & FileTemplate & " matches more than one file:" & _
vbLf & " " & FileNameMatch
FileNameMatch = "" ' No single match
End If
' Add name of current match to error message
ErrorMsg = ErrorMsg & vbLf & " " & FileNameCrnt
Loop
End If
If FileNameMatch = "" Then
' No single match found.
' ErrorMsg contains an appropriate error message
With WbookError
With .Worksheets("Errors")
RowErrorNext = .Cells(Rows.Count, "A").End(xlUp).Row + 1
With .Cells(RowErrorNext, "A")
.Value = Now()
.VerticalAlignment = xlTop
End With
.Cells(RowErrorNext, "B").Value = ErrorMsg
Set OpenWorkbook = Nothing
End With
End With
Else
' Single match found
Set OpenWorkbook = Workbooks.Open(Path & "\" & FileNameMatch)
End If
End Function
Response to extra question
VBA has nothing quite as convenient as VB's Try but it does have some error handling under programmer control.
If you use a command such as:
Worksheets("Sheet2").Delete
the user will be asked to confirm the deletion. To avoid this, use:
Application.DisplayAlerts = False
Worksheets("Sheet2").Delete
Application.DisplayAlerts = True
I have seen code with Application.DisplayAlerts = False at the start of a macro which means no alert will be displayed for the user's attention even if the pogrammer was not expecting it. By bracketing the Delete, I ensure only the alert I was expecting is suppressed.
Consider:
Sub OpenFile()
Dim InputFileNum As Long
InputFileNum = FreeFile
Open "Dummy.txt" For Input As InputFileNum
Debug.Print "File successfully opened"
Close InputFileNum
End Sub
The file "Dummy.txt" does not exist so the macro will stop on the Open statement.
You will sometimes see code like this:
Sub OpenFile()
Dim InputFileNum As Long
On Error GoTo ErrorCode
InputFileNum = FreeFile
Open "Dummy.txt" For Input As InputFileNum
Call MsgBox("File successfully opened", vbOKOnly)
Close InputFileNum
Exit Sub
ErrorCode:
Debug.Print "Unexpected error: " & Err.Number & " " & Err.Description
End Sub
Here I have provided a general handler for any error condition that may occur. I do not approve although I accept that this is slightly better than having the non-technical user seeing the faulty statement highlighted. The trouble is any error will result in the same unhelpful error message.
I never include error handling during development. If an error occurs, I want the macro to stop on the faulty statement so I can consider how to avoid the error. Here I should check the file exists before attempting to open it. I prefer something like this:
Sub OpenFile()
Dim FileSysObj As Object
Dim InputFileNum As Long
On Error GoTo ErrorCode
Set FileSysObj = CreateObject("Scripting.FileSystemObject")
If Not FileSysObj.FileExists("Dummy.txt") Then
Call MsgBox("I am unable to find ""Dummy.txt"". List of helpful suggestions.", vbOKOnly)
Exit Sub
End If
InputFileNum = FreeFile
Open "Dummy.txt" For Input As InputFileNum
Call MsgBox("File successfully opened", vbOKOnly)
Close InputFileNum
Exit Sub
ErrorCode:
Debug.Print "Unexpected error: " & Err.Number & " " & Err.Description
End Sub
I have including checking code for the error I expect. If the file does not exist, I have displayed a message which I hope will help the user fix the problem for themselves.
Sometimes you cannot avoid an error. To test the code below, I created file Dummy.txt but set the "Read access denied" flag. There is no easy method (to my knowledge) for a VBA macro to test this flag. I have a general handler for unexpected errors but I switch it off for the Open statment so I can include specific code for open failures. I have removed the code that uses FileExists() to test if Dummy.txt exists because it is easier to include it with the other open file error tests.
Sub OpenFile()
Dim FileSysObj As Object
Dim InputFileNum As Long
On Error GoTo ErrorCode ' General handler for unexpected errors
InputFileNum = FreeFile
Err.Clear
On Error Resume Next ' Record error in Err object and continue
Open "Dummy.txt" For Input As InputFileNum
Select Case Err.Number
Case 0
' No error.
Case 53 ' File does not exist
Call MsgBox("I am unable to find ""Dummy.txt"". List of helpful suggestions.", vbOKOnly)
Exit Sub
Case 75 ' Path/File access error
Call MsgBox("It appears file ""Dummy.txt"" exists but I do not have permission to read it.", vbOKOnly)
Exit Sub
Case Else
Call MsgBox("My attempt to open ""Dummy.txt"" failed with an unexpected error condition" & vbLf & _
" " & Err.Number & " " & Err.Description, vbOKOnly)
Exit Sub
End Select
On Error GoTo ErrorCode ' Restore general handler for unexpected errors
Call MsgBox("File successfully opened", vbOKOnly)
Close InputFileNum
Exit Sub
ErrorCode:
Debug.Print "Unexpected error: " & Err.Number & " " & Err.Description
End Sub
Visit http://support.microsoft.com/kb/146864 for a long list of error codes and more information about error handling.

EXCEL VBA WorksheetFunction.CountIf() in a SELECT CASE

I know that it is possible to use If statement but out of curiosity, as mentioned in the title, is it possible to use SELECT statement to do something as BOLDED below? I've submitted my whole Sub as below for better understanding:
Sub addNewCust_Click()
Dim response As String
response = Application.InputBox(prompt:="", Title:="New customer name", Type:=2)
Select Case response
Case False
Exit Sub
'Check if response is not an empty value AND record found in "CustomerList"
Case Is <> "" & WorksheetFunction.CountIf(Worksheets("CustomerList").Range("B:B"), response) > 0
MsgBox "'" & response & "' already exists on this sheet."
Call addNewCust_Click
'Check if response is not an empty value and record is not found in "Customerlist"
Case Is <> "" & WorksheetFunction.CountIf(Worksheets("CustomerList").Range("B:B"), response) < 1
Sheets("CustomerList").Range("B1048576").End(xlUp).Offset(1, 0).Value = response
MsgBox "'" & response & "' successfully entered!"**
Case Else
MsgBox "Field is empty!"
Call addNewCust_Click
End Select
End Sub
Like this?
Sub addNewCust_Click()
Dim response As String
response = Application.InputBox(prompt:="", Title:="New customer name", Type:=2)
Select Case response
Case False: Exit Sub
'Check if response is not an empty value AND record found in "CustomerList"
Case Is <> ""
If WorksheetFunction.CountIf(Worksheets("CustomerList").Range("B:B"), response) > 0 Then
MsgBox "'" & response & "' already exists on this sheet."
Call addNewCust_Click
Else
Sheets("CustomerList").Range("B1048576").End(xlUp).Offset(1, 0).Value = response
MsgBox "'" & response & "' successfully entered!"
End If
Case Else
MsgBox "Field is empty!"
Call addNewCust_Click
End Select
End Sub
FOLLOWUP (From Comments)
Select Case is considered to be faster than If-Endif but for such a small scenario, the efficiency comparison is futile. What is more important is how you write the code
Below is another way. I love this way as things are broken down into smaller parts and everything is declared properly. I am not touching error handling below. See this for detailed analysis.
The below method is useful because
when you are looking at your code (say maybe after an year) and you know exactly what is happening since the code is commented.
Easy to maintain the code. For example if the Sheet name changes then you have to change it only at one place. The alternative is to also use Codenames
You can use the same code across all Excel platforms. If you hardcode your range, Ex: Range("B1048576") then the above code will not work in Excel 2003.
Sample Code
Sub addNewCust_Click()
Dim ws As Worksheet
Dim Lrow As Long
Dim response
'~~> Set the relevant worksheet
Set ws = ThisWorkbook.Worksheets("CustomerList")
With ws
Do
'~~> Get user response
response = Application.InputBox(prompt:="", Title:="New customer name", Type:=2)
Select Case response
Case False: Exit Sub '<~~ If user presses cancel or closes using 'X'
Case "": MsgBox "Field is empty!" '<~~ If user enters a blank entry
Case Else
'~~> Check if the entry exists
If WorksheetFunction.CountIf(.Range("B:B"), response) > 0 Then
MsgBox "'" & response & "' already exists on this sheet."
Else
'~~> Get last Row
Lrow = .Range("B" & .Rows.Count).End(xlUp).Row + 1
'~~> Add the new entry
.Range("B" & Lrow).Value = response
MsgBox "'" & response & "' successfully entered!"
Exit Do 'OR Exit Sub (As Applicable)
End If
End Select
Loop
End With
End Sub

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