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   源码介绍

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VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form FormInput 
   Caption         =   "输入缓冲区与输出缓冲区"
   ClientHeight    =   1515
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   3870
   LinkTopic       =   "Form1"
   ScaleHeight     =   1515
   ScaleWidth      =   3870
   StartUpPosition =   3  '窗口缺省
   Begin MSCommLib.MSComm MSComm1 
      Left            =   120
      Top             =   840
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
      RThreshold      =   1
   End
   Begin VB.CommandButton CmdOpenPort 
      Caption         =   "打开串口"
      Height          =   375
      Left            =   120
      TabIndex        =   4
      Top             =   240
      Width           =   1095
   End
   Begin VB.TextBox TxtReceive 
      Height          =   375
      Left            =   2520
      TabIndex        =   3
      Top             =   960
      Width           =   1095
   End
   Begin VB.CommandButton CmdReceive 
      Caption         =   "接收数据"
      Height          =   375
      Left            =   1200
      TabIndex        =   2
      Top             =   960
      Width           =   1215
   End
   Begin VB.TextBox TxtSend 
      Height          =   375
      Left            =   2520
      TabIndex        =   1
      Top             =   240
      Width           =   1095
   End
   Begin VB.CommandButton CmdSend 
      Caption         =   "发送数据"
      Height          =   375
      Left            =   1320
      TabIndex        =   0
      Top             =   240
      Width           =   1095
   End
End
Attribute VB_Name = "FormInput"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub Command1_Click()
  
  
  MSComm1.Output = Text1.Text
  Do
    'DoEvents
  Loop Until MSComm1.InBufferCount <> 0
  'Delay 2
  
  'Text2.Text = MSComm1.Input
  
End Sub

Private Sub Command2_Click()
  Text2.Text = MSComm1.Input
End Sub

Private Sub Command3_Click()
  MSComm1.CommPort = 1
  MSComm1.PortOpen = True
  MSComm1.InputLen = 0
  MSComm1.InputMode = comInputModeText
End Sub




'Private Sub MSComm1_OnComm() '接收数据
'   Dim strBuff As String '定义字符串变量
'   Select Case MSComm1.CommEvent
'     Case comEvReceive '发生接收事件时
'
'       strBuff = MSComm1.Input
'
'       Text2.Text = strBuff
'
'     Case Else
'   End Select
'End Sub



'延时(X秒)
Public Sub Delay(ByVal ParTime As Long)
    Dim tim
    tim = Timer
    While Timer - tim < ParTime
          DoEvents
    Wend
End Sub



Private Sub CmdOpenPort_Click()
  MSComm1.CommPort = 1                  '设置串口号为Com1
  MSComm1.PortOpen = True               '打开串口
  'MSComm1.InputMode = comInputModeText  '以字符方式输入
  MSComm1.InputMode = comInputModeBinary  '以字符方式输入
  MSComm1.InputLen = 0                  '从输入缓冲区输入所有字符
End Sub

Private Sub CmdReceive_Click()
  TxtReceive.Text = MSComm1.Input      '将输入缓冲区的字符读入接收框中
End Sub

Private Sub CmdSend_Click()
  MSComm1.Output = TxtSend.Text          '将发送框中的数据送入输出缓冲区
  'Do                                     '开始循环
  'Loop Until MSComm1.InBufferCount <> 0  '当接收缓冲区有字符输入时跳出循环
End Sub