VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   7260
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4665
   LinkTopic       =   "Form1"
   ScaleHeight     =   7260
   ScaleWidth      =   4665
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command3 
      Caption         =   "接收"
      Height          =   375
      Left            =   480
      TabIndex        =   6
      Top             =   3120
      Width           =   615
   End
   Begin VB.CommandButton Command2 
      Caption         =   "發(fā)射"
      Height          =   375
      Left            =   600
      TabIndex        =   5
      Top             =   1440
      Width           =   495
   End
   Begin VB.CommandButton Command1 
      Caption         =   "清零"
      Height          =   375
      Left            =   600
      TabIndex        =   4
      Top             =   720
      Width           =   495
   End
   Begin VB.TextBox Text2 
      Enabled         =   0   'False
      Height          =   2655
      Left            =   480
      TabIndex        =   3
      Top             =   4320
      Width           =   3855
   End
   Begin VB.TextBox Text1 
      Height          =   3015
      Left            =   1320
      MultiLine       =   -1  'True
      TabIndex        =   0
      Top             =   480
      Width           =   3015
   End
   Begin MSCommLib.MSComm MSComm1 
      Left            =   240
      Top             =   2280
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
      InputLen        =   1
      RThreshold      =   1
      SThreshold      =   1
      EOFEnable       =   -1  'True
      InputMode       =   1
   End
   Begin VB.Label Label2 
      Caption         =   "wrong code:"
      Height          =   255
      Left            =   240
      TabIndex        =   2
      Top             =   3960
      Width           =   1215
   End
   Begin VB.Label Label1 
      Caption         =   "full is 512 byte:"
      Height          =   255
      Left            =   1320
      TabIndex        =   1
      Top             =   120
      Width           =   1815
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Activate()
'MSComm1.EOFEnable = True
'MSComm1.PortOpen = True
      With MSComm1
                   .CommPort = 1
                  .Settings = "9600,n,8,1"
                  .InputLen = 0
                  .RThreshold = 1
                  .PortOpen = True
          End With

End Sub

Private Sub MSComm1_OnComm()
  On Error GoTo err001
  Dim GetChar     As String
  Select Case MSComm1.CommEvent
              Case comEventOverrun         '數(shù)據(jù)丟失。
              Text2.Text = "數(shù)據(jù)丟失！" + "錯(cuò)誤"
              Case comEventBreak         '   收到   Break。
              Case comEventCDTO         '   CD   (RLSD)   超時(shí)。
              Text2.Text = "   CD   (RLSD)   超時(shí)。！" + "錯(cuò)誤"
              Case comEventCTSTO         '   CTS   Timeout。
              Text2.Text = "CTS   Timeout" + "錯(cuò)誤"
              Case comEventDSRTO         '   DSR   Timeout。
              Text2.Text = "DSR   Timeout。" + "錯(cuò)誤"
              Case comEventFrame         '   Framing   Error
              Text2.Text = "Framing   Error" + "錯(cuò)誤"
              Case comEventOverrun         '數(shù)據(jù)丟失。
              Text2.Text = "數(shù)據(jù)丟失。！" + "錯(cuò)誤"
              Case comEventRxOver     '接收緩沖區(qū)溢出。
              Text2.Text = "接收緩沖區(qū)溢出！" + "錯(cuò)誤"
              Case comEventRxParity     '   Parity   錯(cuò)誤。
              Text2.Text = "Parity   錯(cuò)誤！" + "錯(cuò)誤"
              Case comEventTxFull         '傳輸緩沖區(qū)已滿。
              Text2.Text = "傳輸緩沖區(qū)已滿！" + "錯(cuò)誤"
              Case comEventDCB         '獲取   DCB]   時(shí)意外錯(cuò)誤
              Text2.Text = "獲取   DCB]   時(shí)意外錯(cuò)誤！" + "錯(cuò)誤"
    
              Case comEvReceive         '   收到數(shù)據(jù)
              ' 接收數(shù)據(jù)
              ' 對(duì)數(shù)據(jù)進(jìn)行處理
                  If MSComm1.InBufferCount Then
                          GetChar = MSComm1.Input
                  End If
                  Text1.Text = Text1.Text + GetChar
                  '執(zhí)行某一函數(shù)（省略）
              Case .comEvSend
              '發(fā)送數(shù)據(jù)
              Case .comEventRxParity
              '對(duì)奇偶校驗(yàn)錯(cuò)誤進(jìn)行處理
  End Select
          Exit Sub
err001:
          MsgBox Err.Description, vbCritical, "錯(cuò)誤"
End Sub