table_test.frm

个人写的一个串口通讯程序

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3465
   ClientLeft      =   2715
   ClientTop       =   1980
   ClientWidth     =   5025
   LinkTopic       =   "Form1"
   ScaleHeight     =   3465
   ScaleWidth      =   5025
   Begin VB.Timer Timer2 
      Interval        =   3000
      Left            =   3000
      Top             =   240
   End
   Begin VB.TextBox Text2 
      Height          =   495
      Left            =   1800
      TabIndex        =   5
      Top             =   1800
      Width           =   2895
   End
   Begin VB.CommandButton Command2 
      Caption         =   "接收"
      Height          =   495
      Left            =   2280
      TabIndex        =   4
      Top             =   2640
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      Height          =   495
      Left            =   1800
      TabIndex        =   3
      Top             =   1200
      Width           =   2895
   End
   Begin VB.Timer Timer1 
      Left            =   4200
      Top             =   240
   End
   Begin VB.CommandButton Command1 
      Caption         =   "发送"
      Height          =   495
      Left            =   600
      TabIndex        =   0
      Top             =   2640
      Width           =   1215
   End
   Begin MSCommLib.MSComm MSComm1 
      Left            =   3960
      Top             =   2520
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   327680
      DTREnable       =   -1  'True
      EOFEnable       =   -1  'True
   End
   Begin VB.Label Label2 
      Caption         =   "发送数据"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   240
      TabIndex        =   2
      Top             =   1920
      Width           =   1215
   End
   Begin VB.Label Label1 
      Caption         =   "返回数据"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   240
      TabIndex        =   1
      Top             =   1200
      Width           =   1215
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

Private Sub Command1_Click()
Dim x1, x2, sline As String
Dim nfilehandle As Integer
Const filename = "send.txt"

nfilehandle = FreeFile
Open filename For Input As #nfilehandle
Do While Not EOF(nfilehandle) ' 循环至文件尾。
   Input #nfilehandle, sline
    x2 = x2 + sline + Chr(26)
Loop

Close #nfilehandle    ' 关闭文件。
x1 = sends((x2))
Text2.Text = x1
End Sub

Private Sub Command2_Click()
Dim x As String
x = receive()
Text1.Text = x
End Sub

Private Sub Form_Load()
 Form1.MSComm1.CommPort = 1
    ' 9600 波特，无奇偶校验，8 位数据，一个停止位。
 Form1.MSComm1.Settings = "9600,N,8,1"
 Form1.MSComm1.EOFEnable = True '只有先设其为真comEvEOF才能触发oncomm事件
' Form1.MSComm1.RThreshold = 1 '当输入字符小于此值时 comEvReceive才能触发oncomm事件
 Form1.Timer2.Enabled = True
 Form1.Timer2.Interval = 3000
End Sub

Private Sub Timer1_Timer()
Form1.Timer1.Enabled = False
End Sub

Private Sub Timer2_Timer()
Dim x As String
x = receive()
Text1.Text = x
End Sub
Private Sub MSComm1_OnComm()
    Select Case MSComm1.CommEvent
    ' Handle each event or error by placing
    ' code below each case statement

' 错误
        Case comEventBreak  ' 收到 Break。
        Case comEventCDTO    ' CD (RLSD) 超时。
        Case comEventCTSTO  ' CTS Timeout。
        Case comEventDSRTO  ' DSR Timeout。
        Case comEventFrame  ' Framing Error
        Case comEventOverrun    '数据丢失。
        Case comEventRxOver '接收缓冲区溢出。

        Case comEventRxParity ' Parity 错误。
        Case comEventTxFull '传输缓冲区已满。
        Case comEventDCB    '获取 DCB] 时意外错误

    ' 事件
        Case comEvCD    ' CD 线状态变化。
        Case comEvCTS   ' CTS 线状态变化。
        Case comEvDSR   ' DSR 线状态变化。
        Case comEvRing  ' Ring Indicator 变化。
        Case comEvReceive   ' 收到 RThreshold # of  chars.
          x = receive()
          Text1.Text = x
        Case comEvSend  ' 传输缓冲区有 Sthreshold 个字符                            '
        Case comEvEOF  ' 输入数据流中发现 EOF 字符
          x = receive()
          Text1.Text = x
       End Select


End Sub