基本信息
源码名称：vb读取条形码实例
源码大小：2.58KB
文件格式：.rar
开发语言：ASP
更新时间：2016-12-07
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源码介绍
这是通过rs232串口学习的好例子
VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1
Caption = "Bar Code Reader"
ClientHeight = 3465
ClientLeft = 2250
ClientTop = 2370
ClientWidth = 7080
LinkTopic = "Form1"
ScaleHeight = 3465
ScaleWidth = 7080
Begin VB.ListBox List1
BeginProperty Font
Name = "Times New Roman"
Size = 14.25
Charset = 0
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 2580
Left = 3465
TabIndex = 4
Top = 450
Width = 3435
End
Begin VB.CommandButton Command2
Caption = "结束系统"
BeginProperty Font
Name = "宋体"
Size = 12
Charset = 134
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 855
Left = 495
TabIndex = 2
Top = 2280
Width = 1935
End
Begin MSCommLib.MSComm MSComm1
Left = 2700
Top = 2430
_ExtentX = 1005
_ExtentY = 1005
_Version = 393216
CommPort = 2
DTREnable = -1 'True
RThreshold = 1
End
Begin VB.Label lblCode
AutoSize = -1 'True
Caption = "?????"
BeginProperty Font
Name = "Times New Roman"
Size = 14.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
ForeColor = &H000000FF&
Height = 330
Left = 270
TabIndex = 3
Top = 450
Width = 750
End
Begin VB.Label Label1
AutoSize = -1 'True
Caption = "条形码列表"
BeginProperty Font
Name = "宋体"
Size = 12
Charset = 134
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 240
Index = 1
Left = 3480
TabIndex = 1
Top = 120
Width = 1200
End
Begin VB.Label Label1
AutoSize = -1 'True
Caption = "现在条形码值"
BeginProperty Font
Name = "宋体"
Size = 12
Charset = 134
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 240
Index = 0
Left = 240
TabIndex = 0
Top = 120
Width = 1440
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim GotStr$ '接收到的数据
''''''''''''''''''''''''''''''''''''''''''''''
'使用命令按钮控件
'将OFF字符串指令以Output指令送出，关闭噪音计
'接着关闭通信端口，并结束系统
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub Command2_Click()
MSComm1.PortOpen = False
End
End Sub
''''''''''''''''''''''''''''''''''''''''''''''
'窗体的加载事件
'清空ListBox控件
'首先打开通信端口
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub Form_Load()
List1.Clear
MSComm1.PortOpen = True
End Sub
''''''''''''''''''''''''''''''''''''''''''''''
'通信控件的事件程序
'由读条形码器所传的信息均以事件的方式接收
'确定一笔数据接收完毕后，就清空缓冲区
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub MSComm1_OnComm()
Dim CrPos%
Select Case MSComm1.CommEvent
' 借着取代底下每一个 case 语句来处理每个事件与错误
' 事件
Case comEvCD ' CD 线的状态发生变化.
Case comEvCTS ' CTS 线的状态发生变化.
Case comEvDSR ' DSR 线的状态发生变化.
Case comEvRing ' Ring Indicator 变化.
Case comEvReceive ' 收到 RThreshold # of
GotStr = GotStr Trim(MSComm1.Input) '将数据不断地接入
CrPos = InStr(1, GotStr, Chr(13)) '判断是否遇到结尾字符
'若已收到结尾字符则进行以下的作业
If CrPos <> 0 Then
'显示新值
lblCode.Caption = GotStr
'填入List控件
List1.AddItem Mid(GotStr, 1, CrPos - 1)
List1.ListIndex = List1.ListCount - 1
GotStr = "" '清空接收字符串
End If
Case comEvSend ' 传输缓存区有 Sthreshold 个字符 '
End Select
End Sub