将serialport.readline（）非ascii字符串转换为字节数组 [英] convert serialport.readline() non-ascii string into a byte array

问题描述

我想使用 serialport.readline（），因为它是一个阻塞调用，我得到的数据最后有0x0D 0x0A（CR LF）。但是，我想要的是一个十六进制字符串而不是一个Ascii表示。

例如，我正在通信的设备是发送像{0xff，0xff，0x45 ，0X0D，的0x0A}。我想简单地打印出我的程序，就像这样：0xff，0xff，0x45。 Readline（）可以修剪LF和CR。

尽管通过指定如何使用 serialport.read（buff [] ...）我想读的很多字节但是它没有很好的工作，因为如果我读得太快，那么数组的一半将为0x00，如果我读取的速度太慢，那么COM端口会出现溢出。我不想丢失任何字节。

我尝试将从 serialport.readline（）获得的内容转换为字节数组，但是我得到的十六进制字符串通常变为 0x3F的即可。代码如下：

  var line = string.Join（，，mySerialPort.ReadLine（） >（（Byte）c）.ToString（X））ToArray（））; 
  

我改变了编码几次（ASCII，UTF8，UNICODE），但仍然没有去。 p>

有没有办法将从 readline（）获得的非Ascii 字符串转换为字节数组？ / p>

解决方案

听起来你不应该把它作为文本读取。 >

你从根本上处理二进制数据，所以使用 读取 ，它采用字节数组而不是 char 数组。 （或者重复调用 ReadByte ）

任何时候您尝试将任意二进制数据视为文本， / p>

听起来你已经尝试过了，但是做得很糟糕：

但它没有很好的工作，因为如果我读得太快，数组的一半将是0x00

这表示您忽略 Read 的返回值，该值表示实际读取了多少个字节。你应该有这样的东西：

  int bytesRead = port.Read（buffer，0，buffer.Length）; 
 //现在使用从0（包括）到
 // bytesRead（exclusive）的缓冲区的部分。 
  

I want to use serialport.readline() because it's a blocking call and the data I'm getting has 0x0D 0x0A (CR LF) at the end. However, what I want is an Hex String instead of an Ascii representation.

For example, the device I am communication with is sending byte arrays like {0xff,0xff,0x45,0x0D,0x0A}. I want to simply print out in my program just like this: 0xff, 0xff,0x45. Readline() kindly trims out LF and CR.

I though about using serialport.read(buff[]...) by specifying how many bytes I want to read. But it didn't work very well because if I am reading too fast half of the array will be 0x00 and if I am reading too slow, there will be an overflow for the com port. I don't want to lose any bytes.

I tried to convert what I got from serialport.readline() to a byte array but the hex string I got usually turns into 0x3f. Code is like this:

var line = string.Join(",", mySerialPort.ReadLine().Select(c => ((Byte)c).ToString("X")).ToArray());

I changed the encoding a few times (ASCII, UTF8,UNICODE) but still no go.

Is there any way to convert the non-Ascii String I got from readline() into a byte array?

解决方案

It sounds like you shouldn't be reading it as text data at all.

You're fundamentally dealing with binary data, so use the overload of Read which takes a byte array rather than a char array. (Or call ReadByte repeatedly.)

Any time you try to treat arbitrary binary data as if it's text, you're going to have a bad experience.

It sounds like you've already tried this, but done it badly:

But it didn't work very well because if I am reading too fast half of the array will be 0x00

That suggests you're ignoring the return value of Read, which says how many bytes have actually been read. You should have something like:

int bytesRead = port.Read(buffer, 0, buffer.Length);
// Now use the portion of buffer which is from 0 (inclusive) to
// bytesRead (exclusive).

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