vb.net串口字符编码 [英] vb.net serial port character encoding

问题描述

我使用VB.NET，我需要串行发送和接收字节的数据。这是好和好，直到我需要发送像173.我使用子程序发送一个字节，它接受一个输入作为一个整数，只是将它转换为一个字符打印它。

I'm working with VB.NET and I need to send and receive bytes of data over serial. This is all well and good until I need to send something like 173. I'm using a Subroutine to send a byte that takes an input as an integer and just converts it to a character to print it.

Private Sub PrintByte(ByVal input As Integer)
    serialPort.Write(Chr(input))
End Sub

如果我尝试

PrintByte(173)

或者真的127以上的任何东西发送63.我以为这有点奇怪，所以我查找了ASCII表，它出现63对应于？字符。所以我认为发生了什么是VB.NET试图将该数字编码为一个字符，它不能识别，所以它只打印一个？。

Or really anything above 127 it sends 63. I thought that was a bit odd, so i looked up the ASCII table and it appears 63 corresponds to the ? character. So i think what is happening is VB.NET is trying to encode that number into a character that it does not recognize so it just prints a ?.

使用，以及如何实现编码更改？

What encoding should I use, and how would I implement the encoding change?

推荐答案

这里的问题是SerialPort.Encoding属性。默认为Encoding.ASCII，不能处理超过127的值的编码。您需要实际发送一个字节而不是字符来实现一个名为PrintByte的方法：

The issue here is the SerialPort.Encoding property. Which defaults to Encoding.ASCII, an encoding that cannot handle a value over 127. You need to implement a method named PrintByte by actually sending a byte, not a character:

Private Sub PrintByte(ByVal value As Integer)
    Dim bytes() As Byte = {CByte(value)}
    serialPort.Write(bytes, 0, bytes.Length)
End Sub

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