从字符串中获取字节 [英] Get bytes from string

问题描述

我知道这很容易但是我看不到它。



我有一个字符串，因此100A。



它有两个CORRECT值，包含两个字节。不需要转换。



我想做的就是从这个字符串转到两个字节，即



MSB = 0x10

LSB = 0x0A



就是这样。



谢谢。

解决方案

这是如何： https://msdn.microsoft.com/en-us/library/ds4kkd55(v = vs.110）.aspx [ ^ ]。



不，我只是在开玩笑。 :-)



这是其中一种方法：使用 ushort.TryParse 与 System.Globalization.NumberStyles.HexNumber 和中性文化：

https://msdn.microsoft.com/en-us/library/zfh885y3%28v=vs.110%29.aspx [ ^ ]，

https://msdn.microsoft.com/ en-us / library / system.globalization.numberstyles％28v = vs.110％29.aspx [ ^ ]。



如果 TryParse 返回true，解析成功，否则输入数据格式错误。如果成功，您在一个16位值中有两个字节。要将其拆分为单独的字节，您可以使用类 System.BitConverter ：

https://msdn.microsoft.com/en-us/library/system.bitconverter%28v=vs.110%29 .aspx [ ^ ]，

https://msdn.microsoft.com/en-us/library/8wwsdz3k%28v=vs.110%29.aspx [ ^ ]。



简单，不是吗？



一种替代方法：从原始字符串中提取两个代表单独字节的双字符子字符串，然后使用 byte.TryParse 以同样的方式。

-SA

我知道它是简单。我昨天确实得到了解决方案，但出于某种原因我根本没有看到它。糟糕的一天。无论如何，就是这样：

  string   value  =   100A; 
 
  //  转换为字节，告诉转换器基础工作。 
  byte  msb = Convert.ToByte（ value  .Substring（ 0 ， 2 ）， 16 ）; 
  byte  lsb = Convert.ToByte（ value  .Substring（ 2 ， 2 ）， 16 ）; 

I know that this is going to be easy but I just cannot see it.

I have a string, thus "100A".

This has two CORRECT values for two bytes in it. No conversion is needed.

All I want to do is go from this string, to two bytes, i.e.

MSB = 0x10
LSB = 0x0A

And that's it.

Thanks.

解决方案

This is how: https://msdn.microsoft.com/en-us/library/ds4kkd55(v=vs.110).aspx[^].

No, I was just kidding. :-)

This is one of the ways: use ushort.TryParse with System.Globalization.NumberStyles.HexNumber and neutral culture:
https://msdn.microsoft.com/en-us/library/zfh885y3%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.globalization.numberstyles%28v=vs.110%29.aspx[^].

If TryParse returns true, the parsing was successful, if not, input data was in wrong format. In case of success, you got two bytes in one 16-bit value. To split it to separate bytes, you can use the class System.BitConverter:
https://msdn.microsoft.com/en-us/library/system.bitconverter%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/8wwsdz3k%28v=vs.110%29.aspx[^].

Simple, isn't it?

One alternative: from your original string, extract two two-character sub-strings representing separate bytes, and use byte.TryParse in the same way.

—SA

I knew it was easy. I did get the solution yesterday, but for some reason I simply didn't "see" it. Bad day. Anyway, it's just this:

string value = "100A";

// Convert to byte, telling converter the base to work in.
byte msb = Convert.ToByte(value.Substring(0, 2), 16);
byte lsb = Convert.ToByte(value.Substring(2, 2), 16);

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