Cómo generar códigos de barras EAN-128

[jericosoft]

Necesitas un Picturebox y Textbox


Private Sub Txtcode_LostFocus(Index As Integer)
Call DrawBarcode(Txtcode, Picture2)
End Sub


Sub DrawBarcode(ByVal bc_string As String, obj As Control)
Dim xpos!, y1!, y2!, dw%, th!, tw, new_string$
'define barcode patterns
Dim bc(90) As String
bc(1) = "1 1221" 'pre-amble
bc(2) = "1 1221" 'post-amble
bc(48) = "11 221" 'digits
bc(49) = "21 112"
bc(50) = "12 112"
bc(51) = "22 111"
bc(52) = "11 212"
bc(53) = "21 211"
bc(54) = "12 211"
bc(55) = "11 122"
bc(56) = "21 121"
bc(57) = "12 121"
'capital letters
bc(65) = "211 12" 'A
bc(66) = "121 12" 'B
bc(67) = "221 11" 'C
bc(68) = "112 12" 'D
bc(69) = "212 11" 'E
bc(70) = "122 11" 'F
bc(71) = "111 22" 'G
bc(72) = "211 21" 'H
bc(73) = "121 21" 'I
bc(74) = "112 21" 'J
bc(75) = "2111 2" 'K
bc(76) = "1211 2" 'L
bc(77) = "2211 1" 'M
bc(78) = "1121 2" 'N
bc(79) = "2121 1" 'O
bc(80) = "1221 1" 'P
bc(81) = "1112 2" 'Q
bc(82) = "2112 1" 'R
bc(83) = "1212 1" 'S
bc(84) = "1122 1" 'T
bc(85) = "2 1112" 'U
bc(86) = "1 2112" 'V
bc(87) = "2 2111" 'W
bc(88) = "1 1212" 'X
bc(89) = "2 1211" 'Y
bc(90) = "1 2211" 'Z
'Misc
bc(32) = "1 2121" 'space
bc(35) = "" '# cannot do!
bc(36) = "1 1 1 11" '$
bc(37) = "11 1 1 1" '%
bc(43) = "1 11 1 1" '+
bc(45) = "1 1122" '-
bc(47) = "1 1 11 1" '/
bc(46) = "2 1121" '.
bc(64) = "" '@ cannot do!
bc(65) = "1 1221" '*

bc_string = UCase(bc_string)

'dimensions
obj.ScaleMode = 3 'pixels
obj.Cls
obj.Picture = Nothing
dw = CInt(obj.ScaleHeight / 40) 'space between bars
If dw < 1 Then dw = 1
'Debug.Print dw
th = obj.TextHeight(bc_string) 'text height
tw = obj.TextWidth(bc_string) 'text width
new_string = Chr$(1) & bc_string & Chr$(2) 'add pre-amble, post-amble

y1 = obj.ScaleTop
y2 = obj.ScaleTop + obj.ScaleHeight - 1.5 * th
obj.Width = 1.1 * Len(new_string) * (15 * dw) * obj.Width / obj.ScaleWidth


'draw each character in barcode string
xpos = obj.ScaleLeft
For n = 1 To Len(new_string)
c = Asc(Mid$(new_string, n, 1))
If c > 90 Then c = 0
bc_pattern$ = bc(c)

'draw each bar
For i = 1 To Len(bc_pattern$)
Select Case Mid$(bc_pattern$, i, 1)
Case " "
'space
obj.Line (xpos, y1)-(xpos + 1 * dw, y2), &HFFFFFF, BF
xpos = xpos + dw

Case "1"
'space
obj.Line (xpos, y1)-(xpos + 1 * dw, y2), &HFFFFFF, BF
xpos = xpos + dw
'line
obj.Line (xpos, y1)-(xpos + 1 * dw, y2), &H0&, BF
xpos = xpos + dw

Case "2"
'space
obj.Line (xpos, y1)-(xpos + 1 * dw, y2), &HFFFFFF, BF
xpos = xpos + dw
'wide line
obj.Line (xpos, y1)-(xpos + 2 * dw, y2), &H0&, BF
xpos = xpos + 2 * dw
End Select
Next
Next

'1 more space
obj.Line (xpos, y1)-(xpos + 1 * dw, y2), &HFFFFFF, BF
xpos = xpos + dw

'final size and text
obj.Width = (xpos + dw) * obj.Width / obj.ScaleWidth
obj.CurrentX = (obj.ScaleWidth - tw) / 2
obj.CurrentY = y2 + 0.25 * th
obj.Print bc_string

'copy to clipboard
obj.Picture = obj.Image
Clipboard.Clear
Clipboard.SetData obj.Image, 2

End Sub