rs232.frm

是一个在wondos下的一个简单的VB程序

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton com_exit 
      Caption         =   "退出"
      Height          =   375
      Left            =   2040
      TabIndex        =   4
      Top             =   2640
      Width           =   255
   End
   Begin VB.CommandButton com_clear 
      Caption         =   "clear"
      Height          =   375
      Left            =   1920
      TabIndex        =   3
      Top             =   2040
      Width           =   495
   End
   Begin VB.TextBox displaytext 
      Height          =   1815
      Left            =   2880
      TabIndex        =   2
      Text            =   "Text2"
      Top             =   480
      Width           =   1575
   End
   Begin VB.TextBox inputtext 
      Height          =   1815
      Left            =   120
      TabIndex        =   1
      Text            =   "Text1"
      Top             =   480
      Width           =   1455
   End
   Begin VB.CommandButton com_send 
      Caption         =   "发送"
      Height          =   375
      Left            =   1800
      TabIndex        =   0
      Top             =   480
      Width           =   495
   End
   Begin MSCommLib.MSComm MSComm1 
      Left            =   1800
      Top             =   1080
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim instring As String
Dim s As String


Private Sub com_clear_Click()
inputtext.Text = ""
End Sub

Private Sub com_exit_Click()
MSComm1.PortOpen = False
s = ""
instring = ""
End

End Sub

Private Sub com_send_Click()
On Error Resume Next
If inputtext.Text = "" Then
x = MsgBox("您输入的为空值", 16)
Exit Sub
End If
MSComm1.Output = inputtext.Text
End Sub



Private Sub Form_Load()
s = ""
instring = ""
inputtext.Text = ""
MSComm1.RThreshold = 1
displaytext = ""
MSComm1.CommPort = 1
MSComm1.Settings = "9600,n,8,1"
If MSComm1.PortOpen = False Then
    MSComm1.PortOpen = True
End If

End Sub

Private Sub MSComm1_OnComm()
s = MSComm1.Input
instring = instring + s
displaytext.Text = instring

End Sub