从串口读取时如何应用编码 [英] How to apply encoding when reading from a serial port

问题描述

我正在从串行端口读取数据.我读了这篇文章:http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/a709d698-5099-4e37-9e10-f66ff22cdd1e

I'm reading data from a serial port. I read this posting: http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/a709d698-5099-4e37-9e10-f66ff22cdd1e

他正在写我遇到的许多问题，但在他的文章中他提到使用:System.Text.Encoding.GetEncoding("Windows-1252").我遇到的问题是何时以及如何应用它.在我看来，有三个潜在的地方.定义串口对象时:

He is writing about many of the issues I have encounter, but in his writing he refers to using: System.Text.Encoding.GetEncoding("Windows-1252"). The problem I'm having is when and how to apply this. There are three potitional spots in my opinion. When the serial port object is define:

private SerialPort comport = new SerialPort();

事件处理程序:

comport.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);

或者在读取数据时:

string data = comport.ReadExisting();

无论我在哪里添加它.我似乎得到了错误.如何使用编码?

No matter where I add it. I seem to get errors. How would one use Encoding?

推荐答案

不使用 ReadExisting，而是使用端口的 Read 方法获取字节，然后将其转换为具有所需编码的字符串，如下所示:

Instead of using ReadExisting, use the port's Read method to get the bytes and then convert them to a string with the desired encoding, like this:

void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort port = (SerialPort)sender;
    byte[] data = new byte[port.BytesToRead];
    port.Read(data, 0, data.Length);
    string s = Encoding.GetEncoding("Windows-1252").GetString(data);
}

更新:根据 João 的回答，这是一个更简单、仍然对 C#-2.0 友好的版本.在你实例化你的 SerialPort 对象后，像这样设置它的 Encoding 属性:

Update: Here's a simpler, still-C#-2.0-friendly version based on João's answer. After you instantiate your SerialPort object, set its Encoding property like so:

port.Encoding = Encoding.GetEncoding("Windows-1252");

那么你的 DataReceived 方法就变成了这样:

Then your DataReceived method becomes just this:

void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort port = (SerialPort)sender;
    string s = port.ReadExisting();
}

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