Input form barcode scanner. (1 Viewer)

djshrew

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Hi all,

Being a complete duffer at this access/VBA stuff i was wondering what this code does?

code...
Code:
Option Compare Database   'Use database order for string comparisons
Option Explicit
'
' barcode39.mdb
'
' Barcode Generator for Code 3 of 9, Code 39, and Mil-spec Logmars.
'
' version 2.0 (updated for MsAccess 97)
'
' (c) 1993-1999 James Isle Mercanti, Cocoa Beach, FL 32931  USA
' Permission granted for public use and royalty-free distribution.
' No mention of source or credits is required. All rights reserved.
'
' TO USE THIS CODE:
'
'   1 - Create Report with a TextBox control. (example named Barcode)
'       Make sure the Visible property is set to "No".
'   2 - Set On-Print property of section to [Event Procedure]
'       by clicking on the [...] and selecting "Code Builder"
'   3 - Confirm that the following code matches yours...
'
'      Sub Detail1_Print (Cancel As Integer, PrintCount As Integer)
'
'         Result = MD_Barcode39(Barcode, Me)
'
'      End Sub
'
'   4 - NOTE: The name of the section is "Detail1" for example only!
'       Your section might show a different name. Ditto for "Barcode".
'
'   5 - NOTE: To use on sub-forms, the Report name should be hard-coded
'       into the function. i.e. Rpt = Reports!MainForm!SubForm.Report.
'       The easy method is to just avoid using sub-forms and sub-reports.
'

Function MD_Barcode39(Ctrl As Control, Rpt As Report)
    
    On Error GoTo ErrorTrap_BarCode39
    
    Dim Nbar As Single, Wbar As Single, Qbar As Single, NextBar As Single
    Dim CountX As Single, CountY As Single, CountR As Single
    Dim Parts As Single, Pix As Single, Color As Long, BarCodePlus As Variant
    Dim Stripes As String, BarType As String, Barcode As String
    Dim Mx As Single, my As Single, Sx As Single, Sy As Single
    Const White = 16777215: Const Black = 0
    Const Nratio = 20, Wratio = 55, Qratio = 35
    
    'Get control size and location properties.
    Sx = Ctrl.Left: Sy = Ctrl.Top: Mx = Ctrl.Width: my = Ctrl.Height
    
    'Set handle on control.
    Barcode = Ctrl
    
    'Calculate actual and relative pixels values.
    Parts = (Len(Barcode) + 2) * ((6 * Nratio) + (3 * Wratio) + (1 * Qratio))
    Pix = (Mx / Parts):
    Nbar = (20 * Pix): Wbar = (55 * Pix): Qbar = (35 * Pix)
    
    'Initialize bar index and color.
    NextBar = Sx
    Color = White
    
    'Pad each end of string with start/stop characters.
    BarCodePlus = "*" & UCase(Barcode) & "*"
    
    'Walk through each character of the barcode contents.
    For CountX = 1 To Len(BarCodePlus)
        
        'Get Barcode 1/0 string for indexed character.
        Stripes = MD_BC39(Mid$(BarCodePlus, CountX, 1))
        For CountY = 1 To 9
            
            'For each 1/0, draw a wide/narrow bar.
            BarType = Mid$(Stripes, CountY, 1)
            
            'Toggle the color (black/white).
            If Color = White Then Color = Black Else Color = White
            Select Case BarType
                
                Case "1"
                    'Draw a wide bar.
                    Rpt.Line (NextBar, Sy)-Step(Wbar, my), Color, BF
                    NextBar = NextBar + Wbar
                
                Case "0"
                    'Draw a narrow bar.
                    Rpt.Line (NextBar, Sy)-Step(Nbar, my), Color, BF
                    NextBar = NextBar + Nbar
            
            End Select
        Next CountY
        
        'Toggle the color (black/white).
        If Color = White Then Color = Black Else Color = White
        
        'Draw intermediate "quiet" bar.
        Rpt.Line (NextBar, Sy)-Step(Qbar, my), Color, BF
        NextBar = NextBar + Qbar
        
    Next CountX
    
Exit_BarCode39:
    Exit Function

ErrorTrap_BarCode39:
    Resume Exit_BarCode39

End Function

Function MD_BC39(CharCode As String) As String
    
    On Error GoTo ErrorTrap_BC39

    ReDim BC39(90)

    BC39(32) = "011000100" ' space
    BC39(36) = "010101000" ' $
    BC39(37) = "000101010" ' %
    BC39(42) = "010010100" ' * Start/Stop
    BC39(43) = "010001010" ' +
    BC39(45) = "010000101" ' |
    BC39(46) = "110000100" ' .
    BC39(47) = "010100010" ' /
    BC39(48) = "000110100" ' 0
    BC39(49) = "100100001" ' 1
    BC39(50) = "001100001" ' 2
    BC39(51) = "101100000" ' 3
    BC39(52) = "000110001" ' 4
    BC39(53) = "100110000" ' 5
    BC39(54) = "001110000" ' 6
    BC39(55) = "000100101" ' 7
    BC39(56) = "100100100" ' 8
    BC39(57) = "001100100" ' 9
    BC39(65) = "100001001" ' A
    BC39(66) = "001001001" ' B
    BC39(67) = "101001000" ' C
    BC39(68) = "000011001" ' D
    BC39(69) = "100011000" ' E
    BC39(70) = "001011000" ' F
    BC39(71) = "000001101" ' G
    BC39(72) = "100001100" ' H
    BC39(73) = "001001100" ' I
    BC39(74) = "000011100" ' J
    BC39(75) = "100000011" ' K
    BC39(76) = "001000011" ' L
    BC39(77) = "101000010" ' M
    BC39(78) = "000010011" ' N
    BC39(79) = "100010010" ' O
    BC39(80) = "001010010" ' P
    BC39(81) = "000000111" ' Q
    BC39(82) = "100000110" ' R
    BC39(83) = "001000110" ' S
    BC39(84) = "000010110" ' T
    BC39(85) = "110000001" ' U
    BC39(86) = "011000001" ' V
    BC39(87) = "111000000" ' W
    BC39(88) = "010010001" ' X
    BC39(89) = "110010000" ' Y
    BC39(90) = "011010000" ' Z
    
    MD_BC39 = BC39(Asc(CharCode))

Exit_BC39:
    Exit Function

ErrorTrap_BC39:
    MD_BC39 = ""
    Resume Exit_BC39

End Function

Hope someone can shed some light? i am hopeing that this is the code needed to allow input into a database field.

Thanks in advance

shrew
 

RuralGuy

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This looks like code to generate BarCodes for a TextBox control in graphics. There are now fonts that will do this operation. As for your issue, most BarCode readers take of the conversion for you and supply ascii characters as the input.
 

KeithG

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Are you wanting to scan a barcode and have the data populated on a form? if so do you have a keyboard wedge or a scanner that you must download?
 

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