mainform.frm

Rs232串口通信专题范例,Vusual Basic,Mscomm,PCOMMPRO

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "事件的设计"
   ClientHeight    =   5325
   ClientLeft      =   45
   ClientTop       =   270
   ClientWidth     =   7605
   LinkTopic       =   "Form1"
   ScaleHeight     =   5325
   ScaleWidth      =   7605
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox txtReceive 
      Height          =   2055
      Left            =   4080
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   6
      Top             =   720
      Width           =   3015
   End
   Begin VB.CommandButton Command1 
      Caption         =   "清空接收区"
      BeginProperty Font 
         Name            =   "Tahoma"
         Size            =   12
         Charset         =   136
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   924
      Left            =   4176
      Picture         =   "Mainform.frx":0000
      Style           =   1  'Graphical
      TabIndex        =   5
      Top             =   2805
      Width           =   2412
   End
   Begin MSCommLib.MSComm Comm1 
      Left            =   2640
      Top             =   120
      _ExtentX        =   794
      _ExtentY        =   794
      _Version        =   393216
      DTREnable       =   -1  'True
      RThreshold      =   1
   End
   Begin VB.CommandButton CmdExit 
      Cancel          =   -1  'True
      Caption         =   "退出"
      BeginProperty Font 
         Name            =   "Tahoma"
         Size            =   12
         Charset         =   136
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   876
      Left            =   2352
      Picture         =   "Mainform.frx":0442
      Style           =   1  'Graphical
      TabIndex        =   4
      Top             =   4110
      Width           =   2652
   End
   Begin VB.CommandButton CmdSend 
      Caption         =   "发送字符"
      BeginProperty Font 
         Name            =   "Tahoma"
         Size            =   12
         Charset         =   136
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   924
      Left            =   768
      Picture         =   "Mainform.frx":0884
      Style           =   1  'Graphical
      TabIndex        =   3
      Top             =   2805
      Width           =   2460
   End
   Begin VB.TextBox txtSend 
      BeginProperty Font 
         Name            =   "Times New Roman"
         Size            =   12
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   1860
      Left            =   672
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   0
      Text            =   "Mainform.frx":0B8E
      Top             =   720
      Width           =   2940
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "接收区"
      BeginProperty Font 
         Name            =   "Tahoma"
         Size            =   12
         Charset         =   136
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   285
      Index           =   1
      Left            =   4080
      TabIndex        =   2
      Top             =   360
      Width           =   720
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "发送区"
      BeginProperty Font 
         Name            =   "Tahoma"
         Size            =   12
         Charset         =   136
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   285
      Index           =   0
      Left            =   765
      TabIndex        =   1
      Top             =   360
      Width           =   720
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

''''''''''''''''''''''''''''''''''''''
'使用命令按钮控制项
'关闭通讯埠
'结束系统
''''''''''''''''''''''''''''''''''''''
Private Sub CmdExit_Click()
Comm1.PortOpen = False
End
End Sub

''''''''''''''''''''''''''''''''''''''
'使用命令按钮控制项
'使用Input属性读取串列埠的传入值
'并将结果显示在Label控制的Caption属性里
''''''''''''''''''''''''''''''''''''''
Private Sub CmdReceive_Click()
Dim buf$
buf = Trim(Comm1.Input)
If Len(buf) = 0 Then
  txtReceive.Text = "Empty"
Else
  txtReceive.Text = buf & vbCr
End If
End Sub

''''''''''''''''''''''''''''''''''''''
'使用命令按钮控制项
'使用Output属性将使用者欲传送的字串送出
''''''''''''''''''''''''''''''''''''''
Private Sub CmdSend_Click()
Comm1.Output = Trim(txtSend.Text)
End Sub

''''''''''''''''''''''''''''''''''''''
'MSComm的OnComm事件程序
'由CommEvent属性值的不同，将各别的程式码写入
'相关的副程式中
'在此例中，只要RThresold中的设定字元数到达时
'便会使得CommEvent属性值变成comEvReceive
'因此接收的副程式便被执行
''''''''''''''''''''''''''''''''''''''
Private Sub Comm1_OnComm()
Select Case Comm1.CommEvent
    ' 藉着取代底下每一个 case 陈述式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
          txtReceive.Text = txtReceive.Text + Trim(Comm1.Input)
        Case comEvSend  ' 传输暂存区有 Sthreshold 个字元                            '
    End Select

End Sub

''''''''''''''''''''''''''''''''''''''
'使用命令按钮控制项
'将接收区的显示范围清空
''''''''''''''''''''''''''''''''''''''
Private Sub Command1_Click()
txtReceive = ""
End Sub

''''''''''''''''''''''''''''''''''''''
'表单的载入事件
'开启串列通讯埠，参数亦可在开启之前先行指定，
'指定完後，再开启该通讯埠
''''''''''''''''''''''''''''''''''''''
Private Sub Form_Load()
  Comm1.PortOpen = True

End Sub