我正在尝试使用代码在VB.net中创建一个串口.因为我正在创建一个类库,所以我无法使用内置组件.我试过实例化一个新的SeialPort()对象,但这似乎还不够.我确信有一些简单的我想念,任何帮助将不胜感激!谢谢!
附:我应该补充一点,我此时遇到的问题是获取代码来处理datareceived事件.除此之外,它可能正在起作用,但由于这个问题我无法分辨.
如果要使用事件,请确保使用’withevents’声明serialPort对象.下面的示例将允许您连接到串行端口,并将使用接收的字符串引发事件.
Imports System.Threading Imports System.IO Imports System.Text Imports System.IO.Ports Public Class clsBarcodeScanner Public Event ScanDataRecieved(ByVal data As String) WithEvents comPort As SerialPort Public Sub Connect() Try comPort = My.Computer.Ports.OpenSerialPort("COM5",9600) Catch End Try End Sub Public Sub Disconnect() If comPort IsNot Nothing AndAlso comPort.IsOpen Then comPort.Close() End If End Sub Private Sub comPort_DataReceived(ByVal sender As Object,ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles comPort.DataReceived Dim str As String = "" If e.EventType = SerialData.Chars Then Do Dim bytecount As Integer = comPort.BytesToRead If bytecount = 0 Then Exit Do End If Dim byteBuffer(bytecount) As Byte comPort.Read(byteBuffer,bytecount) str = str & System.Text.Encoding.ASCII.GetString(byteBuffer,1) Loop End If RaiseEvent ScanDataRecieved(str) End Sub End Class