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05/01/2009 at 09:20AM PDT, ID: 24372998
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7.0

I can't seem to get MSCOMM to work with a serial barcode scanner in an Access 2007 Form

Asked by colinasad in VB Controls, Access Coding/Macros, Access Forms

Tags: Microsoft Access 2007

I am developing an Access 2007 "project" (.adp) as a front-end to a SQL Server 2005 Express database.

Earlier today I managed to download and register MSCOMM32.OCX and now appear to be able to add an MSCOMM control to an Access Form.
However, I have not been able to see any input coming in from a barcode scanner attached to my COM1: serial port. When I move over to an old DOS application on the same laptop, the scanner input arrives OK, so I am fairly certain that communication with the computer is OK.

I have attached the code I am using to initialise the MSComm0 control in my "Form_Load" procedure and it reports "No error".

I have also attached what I do in my "MSComm0_OnComm" procedure and although I have many "tracer" MsgBox messages in there, I have only once had one displayed.

After "reading" the MSComm0 input buffer, how is that buffer "emptied"?
Also, in my Form's "Design View", the MSComm0 control's properties do not list many items under the "Events" tab but all the items I have seen on the internet mention the "OnComm" event, which I have produced a VBA procedure for.

Can anyone suggest how I check that MSCOMM is acrually "working" for me and can anyone explain why I don't seem to be getting any data coming through?

Many thanks. 
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Private Sub Form_Load()
   With Me
       With .MSComm0
            .CommPort = 1
            .Break = False
            .DTREnable = True
            .EOFEnable = False
            .Handshaking = comNone
            .InBufferCount = 0
            .InBufferSize = 1024
            .InputLen = 1024
            .InputMode = comInputModeText
            .NullDiscard = False
            .OutBufferCount = 0
            .OutBufferSize = 1024
            .ParityReplace = Chr(0)
            .RThreshold = 1
            .SThreshold = 0
            .Settings = "9600,N,8,1"
        End With
    
        .MSComm0.PortOpen = True
        
        If Err.Number = 0 Then
            MsgBox "No error after establishing COM port"
        Else
            MsgBox "PROBLEM - error after establishing COM port"
        End If
        
    End With
End Sub ' Form_Load
 
 
Private Sub MSComm0_OnComm()
    Dim strInputString As String
    Dim strChar As String
    
    MsgBox "We are in MSComm0_OnComm"
    With Me.MSComm0
        If .CommEvent = comEvReceive Then
            strInputString = ""
            While .InBufferCount > 0
                strChar = .Input
                MsgBox "Barcod input char : " & strChar
                    
                If strChar = Chr$(13) Then
                    If Not genAllBlanks(Nz(strInputString, "")) Then
                        .cmbStockCode = strInputString
                        MsgBox "Barcode input string : " & strInputString
                    End If
                    strInputString = ""
                Else
                    strInputString = strInputString & strChar
                End If
            Wend
            
        End If
    
    End With
End Sub ' MSComm0_OnComm
 
Keywords: I can't seem to get MSCOMM to work …
Title
1 Why is an MSCOMM control in my Acc…
 
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[+][-]05/01/09 09:38 AM, ID: 24281097

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About this solution

Zones: VB Controls, Access Coding/Macros, Access Forms
Tags: Microsoft Access 2007
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Solution Provided By: colinasad
Participating Experts: 1
Solution Grade: A
 
 
[+][-]05/13/09 03:59 AM, ID: 24373309

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