您好，我最近遇到一个问题，搜索了两个多月，但还没有找到解决方案。我必须编写一个程序/应用程序（我已经在 VB.NET 2010 中开始），它通过 Panasonic KX-TEM824 PBX 机器通过 RS232 端口连接（电缆已经连接：COM15/16 取决于我连接的 USB）并且它连接到解析（接收）来自 PBX 本身的数据，具有来电显示的数据，通话开始和结束的时间，通话的持续时间等。我在互联网上找到了一些已经完成工作的应用程序，但他们可以免费尝试一段时间后需要再次购买或重新启动应用程序。但我认为在代码方面没有太多要实现的。请我真的需要帮助。我在下面发布代码。ps 是为了学习。
Imports System
Imports System.ComponentModel
Imports System.Threading
Imports System.IO.Ports
Public Class frmMain
Dim myPort As Array 'COM Ports detected on the system will be stored here
Delegate Sub SetTextCallback(ByVal [text] As String) 'Added to prevent threading errors during receiveing of data
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'When our form loads, auto detect all serial ports in the system and populate the cmbPort Combo box.
myPort = IO.Ports.SerialPort.GetPortNames() 'Get all com ports available
cmbBaud.Items.Add(9600) 'Populate the cmbBaud Combo box to common baud rates used
cmbBaud.Items.Add(19200)
cmbBaud.Items.Add(38400)
cmbBaud.Items.Add(57600)
cmbBaud.Items.Add(115200)
For i = 0 To UBound(myPort)
cmbPort.Items.Add(myPort(i))
Next
cmbPort.Text = cmbPort.Items.Item(0) 'Set cmbPort text to the first COM port detected
cmbBaud.Text = cmbBaud.Items.Item(0) 'Set cmbBaud text to the first Baud rate on the list
btnDisconnect.Enabled = False 'Initially Disconnect Button is Disabled
End Sub
Private Sub btnConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConnect.Click
SerialPort1.PortName = cmbPort.Text 'Set SerialPort1 to the selected COM port at startup
SerialPort1.BaudRate = cmbBaud.Text 'Set Baud rate to the selected value on
'Other Serial Port Property
SerialPort1.Parity = IO.Ports.Parity.None
SerialPort1.StopBits = IO.Ports.StopBits.One
SerialPort1.DataBits = 8 'Open our serial port
SerialPort1.Open()
btnConnect.Enabled = False 'Disable Connect button
btnDisconnect.Enabled = True 'and Enable Disconnect button
End Sub
Private Sub btnDisconnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisconnect.Click
SerialPort1.Close() 'Close our Serial Port
btnConnect.Enabled = True
btnDisconnect.Enabled = False
End Sub
Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
SerialPort1.Write(txtTransmit.Text & vbCr) 'The text contained in the txtText will be sent to the serial port as ascii
'plus the carriage return (Enter Key) the carriage return can be ommitted if the other end does not need it
End Sub
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
ReceivedText(SerialPort1.ReadExisting()) 'Automatically called every time a data is received at the serialPort
End Sub
Private Sub ReceivedText(ByVal [text] As String)
'compares the ID of the creating Thread to the ID of the calling Thread
If Me.rtbReceived.InvokeRequired Then
Dim x As New SetTextCallback(AddressOf ReceivedText)
Me.Invoke(x, New Object() {(text)})
Else
Me.rtbReceived.Text &= [text]
End If
End Sub
Private Sub cmbPort_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbPort.SelectedIndexChanged
If SerialPort1.IsOpen = False Then
SerialPort1.PortName = cmbPort.Text 'pop a message box to user if he is changing ports
Else 'without disconnecting first.
MsgBox("Valid only if port is Closed", vbCritical)
End If
End Sub
Private Sub cmbBaud_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbBaud.SelectedIndexChanged
If SerialPort1.IsOpen = False Then
SerialPort1.BaudRate = cmbBaud.Text 'pop a message box to user if he is changing baud rate
Else 'without disconnecting first.
MsgBox("Valid only if port is Closed", vbCritical)
End If
End Sub
End Class