从串口数据中删除多余的字节 [英] Removing excess bytes from serial port data

问题描述

大家好，

所以我在这里实现 Ramone de Klein 制作的精彩系列课程：

C ++串行库 [ ^ ]



在他对Read函数的定义中，他将传入的字节写入一个大小为100的数组。问题是当我发送一个数据包时，我知道它的数量小于100，它与垃圾捆绑在一起作为剩余的字节。



我要过滤掉这个。







任何建议如：接下来我可以尝试一下吗？



我尝试过：



1.将传入的数据存储到CString中，但该函数将缓冲区变量定义为void * buffer。因此CString不起作用。

2.根据接收的字节数动态声明缓冲区变量，但该函数不接受不确定大小的数组。

Hi guys,
So I am implementing the brilliant serial class made by Ramone de Klein here:
Serial library for C++[^]

In his definition of the Read function, he writes the incoming bytes into an array of size 100. The problem is when I send a packet of data whose size I know to be less than 100, it comes bundled with garbage as the remaining bytes.

I want to filter this out.



Any suggestions as to what I could try next?

What I have tried:

1. Store the incoming data into a CString, but the function defines the buffer variable as void* buffer. So CString doesn't work.
2. Dynamically declare the buffer variable based on the number of bytes received, but the function does not accept an array of indeterminate size.

推荐答案

只是不要使用额外的字节。你通常知道收到了多少字节。



分配一个足够大的 char * 缓冲区数据的最大长度（对于空终止符，可选加一个字节）。



如果您知道数据是可打印字符并且您想要创建字符串，那么必须指定长度或在缓冲区附加一个空字节。



将数据复制到 CString 你可以使用

Just don't use the additional bytes. You usually know how many bytes has been received.

Allocate a char* buffer that is large enough to hold the maximum length of data (optionally plus one byte for a null terminator).

If you know that the data are printable characters and you want to create a string, you have to specify the length or append a null byte to the buffer.

To copy the data into a CString you can use

/* Use the constructor for char* because data are usually ASCII. */
/* Note that this converts to Unicode for Unicode builds. */
CString str(buffer, dwRead);

/* Using a CStringA and setString(): */
CStringA strA;
strA.SetString(buffer, dwRead);

或者在缓冲区附加一个空字节：

Or append a null byte to the buffer:

/* Check for buffer overrun. */
/* RX_BUF_SIZE is the size of the allocated buffer. */
ASSERT(dwRead < RX_BUF_SIZE);
buffer[dwRead] = 0;

CString str(buffer);

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