一、條形碼的讀取
用過鍵盤口式的掃條碼工具的朋友就知道,它就如同在鍵盤上按下數字鍵一樣,基本不需任何編程和處理。但如果你使用的是其它接口的話,可能你就要為該設備編寫通訊代碼了。以下有一段簡單的25針串口的條碼讀取器通訊代碼。
Option Explicit Dim sData As String Private Sub Form_Load() With MSComm1 .CommPort = 3 '設為COM3,試運行的系統而定,你可提供一個Combox讓用戶選擇。 .PortOpen = True'打開通訊端口 End With End Sub Private Sub MSComm1_OnComm()
Dim EndPos As Integer Select Case MSComm1.CommEvent Case comEvReceive '當有數據傳送過來時 sData = sData & Trim(MSComm1.Input) '檢索回車,通常讀卡機每組數據結尾都返回一個回車作為結束符 EndPos = InStr(1, sData, Chr(13)) If EndPos = 0 Then '如果未結束就繼續努力 Else '讀完一組。 lblBarCode.Caption = sData '顯示一組條形碼 With lstBarCode .AddItem Mid(sData, 1, EndPos - 1) '添加一組條形碼到列表 End With sData = "" '清空 End If End Select End Sub Private Sub cmdEnd_Click() MSComm1.PortOpen = False '關閉端口 End End Sub
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二、條形碼的生成
看完以上關于條碼讀取的代碼是否覺得很容易呢?對,在VB上編程本來就不難。以下關于條形碼生成的代碼也是很容易理解,只需使用一個OFFICE的附帶的BarCode控件就可以輕松打印出11種不同標準的條形碼,足以滿足我們的要求。想起我書架上的一本書中的一篇用Turbo C編寫條形碼打印程序文章,長篇大論,那時不知看了n天,打了n小時字結果也不盡人意,現在真是幸福多了:)。廢話說完,得回歸正題。且看條形碼生成的代碼及有關說明。
源代碼主要由兩個窗體(frmMain主窗體和frmOption條碼設置窗體)和兩個模塊組成(modGetScreen.bas、SysDLG32.bas)。考慮到篇幅,這里只列出部分較為關鍵的代碼。
新建一個標準工程,添加一個名為(Microsoft Access BarCode Control9)的條形碼部件,并添加一個條碼控件到窗口,并將窗口改名為frmMain,如圖所示。由于控件比較多,這里不便細說,詳細內容請看源代碼。
模塊modGetScreen.bas代碼如下:
Option Explicit
'聲明BitBlt、GetDesktopWindow、GetWindowDC、ReleaseDC這幾個API函數略
Public RegUser As Boolean Sub GetObjImage1(Obj As Object, OwnerForm As PictureBox, Picture1 As PictureBox) 'hDC Dim hWndDesk As Long Dim hDCDesk As Long '區域表達變量 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 '取出圖像 Call BitBlt(Picture1.hdc, 0, 0, w, h, hDCDesk, x, y, vbSrcCopy) Call ReleaseDC(hWndDesk, hDCDesk)
End Sub |
主窗體frmMain.frm部分代碼如下:
Private Sub cmdPrint_Click() '生成條形碼圖像 Dim r As Long, i As Integer, t As String,cfile As String '臨時變量 t = BarCode For i = 0 To Val(Times) - 1
BarCode1.Value = BarCode + i DoEvents Picture1.Refresh
GetObjImage1 BarCode1, Conel, Picture1
If RegUser = False Then '如果未注冊添加MASK標記 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 '將條形碼保存為圖像文件以便打印 Next BarCode = t End Sub |
條形碼設置窗體frmOption.frm代碼如下:
Option Explicit '條形碼設置模塊 Private Sub cboBig_Click() BarCode1.Style = cboBig.ListIndex '改變標準 End Sub Private Sub cboDirection_Click() BarCode1.Direction = cboDirection.ListIndex '改變方向 End Sub Private Sub cboLine_Click() BarCode1.LineWeight = cboLine.ListIndex '改變線寬 End Sub Private Sub cboSmall_Click() BarCode1.SubStyle = cboSmall.ListIndex '改變樣式 End Sub Private Sub Check1_Click() BarCode1.ShowData = Check1.Value '是否顯示數據 End Sub Private Sub cmdChange_Click() '設置長、寬大小 BarWidth = BarCode1.Height BarHeight = BarCode1.Width cmdRefresh_Click End Sub Private Sub cmdOK_Click() '傳送條形碼設定到主界面 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() '初始化選項 LoadBigClass cboBig LoadSmallClass cboSmall LoadLineSize cboLine LoadDirection cboDirection End Sub Sub LoadBigClass(cbo As ComboBox) '條碼標準 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) '條碼樣式 With cbo .AddItem "Standard" .AddItem "2-Digit Supplement" .AddItem "5-Digit Supplement" .AddItem "POS Case Code" .ListIndex = 0 End With End Sub |
作者:http://www.zhujiangroad.com
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