Ich bin neu in VB und ich versuche, ein Programm zur Ausgabe von Text statt Hex. Ich habe den Code online gefunden, ein Programm namens maxiCOM. Hier ist der Link http://www.innovatic.dk/knowledg/SerialCOM/SerialCOM.htm. Der Quellcode kann am Ende der Seite heruntergeladen werden.
Leider ist das Niveau der Codierung im Programm weit über mein Verständnisniveau, und ich bekomme nicht wirklich, wie man die Ausgabe von Hex zu Text ändert. Ich würde es sehr schätzen, wenn mir jemand erklären könnte, wie man das macht. Das Snippet des Codes istKonvertieren von Byte in String in Visual Basic
Public Class MaxiTester
Dim SpaceCount As Byte = 0
Dim LookUpTable As String = "ABCDEF"
Dim RXArray(2047) As Char ' Text buffer. Must be global to be accessible from more threads.
Dim RXCnt As Integer ' Length of text buffer. Must be global too.
' Make a new System.IO.Ports.SerialPort instance, which is able to fire events.
Dim WithEvents COMPort As New SerialPort
Private Sub Receiver(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs) Handles COMPort.DataReceived
Dim RXByte As Byte
Do
'----- Start of communication protocol handling -----------------------------------------------------------
' The code between the two lines does the communication protocol. In this case, it simply emties the
' receive buffer and converts it to text, but for all practical applications, you must replace this part
' with a code, which can collect one entire telegram by searching for the telegram
' delimiter/termination. In case of a simple ASCII protocol, you may just use ReadLine and receive
' in a global string instead of a byte array.
' Because this routine runs on a thread pool thread, it does not block the UI, so if you have any data
' convertion, encryption, expansion, error detection, error correction etc. to do, do it here.
RXCnt = 0
Do
RXByte = COMPort.ReadByte
RXArray(RXCnt) = LookUpTable(RXByte >> 4) ' Convert each byte to two hexadecimal characters
RXCnt = RXCnt + 1
RXArray(RXCnt) = LookUpTable(RXByte And 15)
RXCnt = RXCnt + 1
RXArray(RXCnt) = " "
RXCnt = RXCnt + 1
SpaceCount = (SpaceCount + 1) And 31 ' Insert spaces and CRLF for better readability
If SpaceCount = 0 Then ' Insert CRLF after 32 numbers
RXArray(RXCnt) = Chr(13) ' CR
RXCnt = RXCnt + 1
RXArray(RXCnt) = Chr(10) ' LF
RXCnt = RXCnt + 1
Else
If (SpaceCount And 3) = 0 Then ' Insert two extra spaces for each 4 numbers
RXArray(RXCnt) = " "
RXCnt = RXCnt + 1
RXArray(RXCnt) = " "
RXCnt = RXCnt + 1
End If
End If
Loop Until (COMPort.BytesToRead = 0)
'----- End of communication protocol handling -------------------------------------------------------------
Me.Invoke(New MethodInvoker(AddressOf Display)) ' Start "Display" on the UI thread
Loop Until (COMPort.BytesToRead = 0) ' Don't return if more bytes have become available in the meantime
End Sub
' Text display routine, which appends the received string to any text in the Received TextBox.
Private Sub Display()
Received.AppendText(New String(RXArray, 0, RXCnt))
End Sub
Danke für die Hilfe! Ich habe es funktioniert, nachdem Sie Ihre Anweisungen befolgt und auch einige der Anzeige-Routine geändert haben. –