Stepping backward using Input #n[resolved]

Here's the deal. I have some code which, to cut a long story short, reads some values from a barcode scanner into an array and compares them with values in a text file.

I have a problem in that if I get a mismatch I want to halt the process and allow the user to re-scan the barcode and compare it against the corresponding value in the text file.

To do this, I think I need to step back in the text file (comma delimited) to ensure that the correct value is being compared.

Here's the code I have, which works great if all values match. There is more to it but here's the bit I'm concentrating on..

VB Code:

Private Sub cmdCompare_Click()
Dim arrX As Integer
 
cmdCompare.Enabled = False
 
If n = 0 Then n = 1
 
 
If n = 1 Then
    Open strinfile For Input As #1
End If
 
        For arrX = 0 To UBound(myArray)
        
        Input #1, LineIn
        
            If LineIn = myArray(arrX) Then
                With shpGreenLight(arrX)
                    .Visible = True
                    .BackColor = &HC000&
                    .FillColor = &HC000&
                End With
            Else
                With shpGreenLight(arrX)
                    .Visible = True
                    .BackColor = &HFF&
                    .FillColor = &HFF&
                End With
                'need to do something here
                Exit Sub
            End If
                
        Next
 
If n = intfileLen Then
    Close #1
End If
 
    doCheckCards
 
End Sub

Any clues?!

Cheers

Why don't you read in the entire file at the start, into an array or whatever. Then you can just compare the values in each array, instead of worrying about going back through the file.

Yeah, kinda thinking that way, the thing I'm having a problem getting my head around is that there are 5 items in myArray whereas there are multiples of 5 in the Input file, if you get my drift. If I read the whole file in then I may have 15 values in one array and 5 in another. I'm going to tie my brain up in knots.

I'm pretty sure that it's really quite simple but my head is beginning to hurt!

:eek:

what if you open it for Random rather than Input and use Seek?

Ooh, now you're confusing me (not hard! ha ha).

Learning on my feet here, any example would be super.

What I've just done is read the infile into an array as suggested. Still, an example of using random and seek would be good!

Ok, now I'm going daft. Take a look at this:

nb. infilearray() is declared in the general declarations

VB Code:

Private Sub Form_Load()
    
    lblcustname.Caption = strcustomer
    Open strinfile For Input As #1
    
    intfileLen = 0
        Do While Not EOF(1)
    
            Input #1, LineIn
            
            ReDim infilearray(intfileLen)
 
            infilearray(intfileLen) = LineIn
            
            MsgBox infilearray(intfileLen) 'correct value contained...
            
            intfileLen = intfileLen + 1
        
        Loop
    
        intfileLen = (intfileLen / 5)
    
        lblboxno.Caption = intfileLen
 
        Close #1
        
        MsgBox infilearray(0) 'empty...
End Sub

Between the code exiting the loop, closing the input file and the final msgbox, the array values disappear.

Any ideas why?

Cheers

Ah, good old ReDim Preserve eh?