VB.Net条形码编程的方法

一、条形码的读取
用过键盘口式的扫条码工具的朋友就知道，它就如同在鍵盘上按下数字鍵一样，基本不需任何编程和处理。但如果你使用的是其它接口的话，可能你就要为该设备编写通讯代码了。以下有一段简单的25针串口的条码读取器通讯代码。
Option
Explicit
Dim sData As String
Private Sub Form_Load()
With MSComm1

.CommPort = 3 '设为COM3，试运行的系统而定，你可提供一个Combox让用户选择。
.PortOpen =
True　'打开通讯端口
End With
End Sub

Private Sub MSComm1_OnComm()

Dim EndPos As Integer

Select Case MSComm1.CommEvent
    Case comEvReceive '当有数据传送过来时
      sData
= sData & Trim(MSComm1.Input)

'检索回车,通常读卡机每组数据結尾都返回一个回车作为结束符
      EndPos = InStr(1, sData,
Chr(13))
      If EndPos = 0 Then '如果未结束就继续努力
      Else '读完一组。

lblBarCode.Caption = sData '显示一组条形码
        With lstBarCode

.AddItem Mid(sData, 1, EndPos - 1) '添加一组条形码到列表
        End With

sData = "" '清空
      End If
End Select
End Sub

Private Sub cmdEnd_Click()
MSComm1.PortOpen = False '关闭端口

End
End Sub

二、条形码的生成
看完以上关于条码读取的代码是否觉得很容易呢？对，在VB上编程本来就不难。以下关于条形码生成的代码也是很容易理解，只需使用一个OFFICE的附带的BarCode控件就可以轻松打印出11种不同标准的条形码，足以满足我们的要求。想起我书架上的一本书中的一篇用Turbo
C编写条形码打印程序文章，长篇大论，那时不知看了n天，打了n小时字结果也不尽人意，现在真是幸福多了:)。废话说完，得回归正题。且看条形码生成的代码及有关说明。
源代码主要由两个窗体（frmMain主窗体和frmOption条码设置窗体）和两个模块组成
(modGetScreen.bas、SysDLG32.bas)。考虑到篇幅，这里只列出部分较为关键的代码。
新建一个标准工程，添加一个名为
(Microsoft Access BarCode
Control9)的条形码部件，并添加一个条码控件到窗口，并将窗口改名为frmMain，如图所示。由于控件比较多，这里不便细说，详细内容请看源代码。
模块modGetScreen.bas代码如下：
Option
Explicit
声明BitBlt、 GetDesktopWindow、GetWindowDC、ReleaseDC这几个API函数略
Public
RegUser As Boolean

Sub GetObjImage1(Obj As Object, OwnerForm As PictureBox, Picture1 As
PictureBox)
'hDC
Dim hWndDesk As Long
Dim hDCDesk As Long

'区域表达变量
Dim x As Long
Dim y As Long
Dim w As Long
Dim h As
Long

x = Obj.Left Screen.TwipsPerPixelX
y = Obj.Top
Screen.TwipsPerPixelY
w = Obj.Width Screen.TwipsPerPixelX
h =
Obj.Height Screen.TwipsPerPixelY
hDCDesk = OwnerForm.hdc
'取出图像

Call BitBlt(Picture1.hdc, 0, 0, w, h, hDCDesk, x, y, vbSrcCopy)
Call
ReleaseDC(hWndDesk, hDCDesk)

End Sub

主窗体frmMain.frm部分代码如下：
Private Sub
cmdPrint_Click()
'生成条形码图像
Dim r As Long, i As Integer, t As String,cfile
As String '临时变量
t = BarCode
For i = 0 To Val(Times) - 1


BarCode1.Value = BarCode + i
    DoEvents
    Picture1.Refresh


    GetObjImage1 BarCode1, Conel, Picture1

    If RegUser = False
Then '如果未注册添加MASK标记
      Picture1.PaintPicture Picture2.Picture, 300,
300
    End If

    If Dir(SavePath, vbDirectory) = "" Then MkDir
SavePath

    SavePath = SavePath & IIf(Right(SavePath, 1)
<> "", "", "")

    cfile = SavePath & BarCode1.Value &
".bmp"

SavePicture Picture1.Image, cfile '将条形码保存为图像文件以便打印
Next
BarCode
= t

End Sub

条形码设置窗体frmOption.frm代码如下：
Option Explicit
'条形码设置模块

Private Sub cboBig_Click()
BarCode1.Style = cboBig.ListIndex
'改变标准
End Sub

Private Sub cboDirection_Click()
BarCode1.Direction =
cboDirection.ListIndex '改变方向
End Sub

Private Sub cboLine_Click()
BarCode1.LineWeight =
cboLine.ListIndex '改变线宽
End Sub

Private Sub cboSmall_Click()
BarCode1.SubStyle =
cboSmall.ListIndex '改变样式
End Sub

Private Sub Check1_Click()
BarCode1.ShowData = Check1.Value
'是否显示数据
End Sub

Private Sub cmdChange_Click()
'设置长、宽大小
BarWidth =
BarCode1.Height
BarHeight = BarCode1.Width
cmdRefresh_Click
End Sub

Private Sub cmdOK_Click()
'传送条形码设定到主界面
With
frmMain.BarCode1
    .LineWeight = BarCode1.LineWeight
    .Style =
BarCode1.Style
    .SubStyle = BarCode1.SubStyle
    .Direction =
BarCode1.Direction
    .Width = BarCode1.Width
    .Height =
BarCode1.Height
    .ShowData = BarCode1.ShowData
    Me.Hide
End
With
With frmMain
    .Picture1.Width = .BarCode1.Width

.Picture1.Height = .BarCode1.Height
    .Conel.Width = .BarCode1.Width

.Conel.Height = .BarCode1.Height
End With
End Sub

Private Sub cmdRefresh_Click()
BarCode1.Width = BarWidth

BarCode1.Height = BarHeight
End Sub

Private Sub Form_Load()
LoadBarInfo
BarWidth =
BarCode1.Width
BarHeight = BarCode1.Height
End Sub

Sub LoadBarInfo() '初始化选项
LoadBigClass cboBig
LoadSmallClass
cboSmall
LoadLineSize cboLine
LoadDirection cboDirection
End Sub
Sub
LoadBigClass(cbo As ComboBox) '条码标准
With cbo
    .AddItem "UPC-A"

.AddItem "UPC-E"
    .AddItem "EAN-13"
    .AddItem "EAN-8"

.AddItem "Case Code"
    .AddItem "Codabar (NW-T)"
    .AddItem
"Code-39"
    .AddItem "Code-128"
    .AddItem "U.S. Postnet"

.AddItem "U.S. Postal FIM"
    .AddItem "JP Post"
    .ListIndex = 2

End With
End Sub
Sub LoadSmallClass(cbo As ComboBox) '条码样式
With
cbo
    .AddItem "Standard"
    .AddItem "2-Digit Supplement"

.AddItem "5-Digit Supplement"
    .AddItem "POS Case Code"
    .ListIndex
= 0
End With
End Sub

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VB.Net条形码编程的方法

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