如何在串行端口上发送和接收扩展的ASCII码 [英] how to send and receive extended ascii codes on serial port

问题描述

我正在使用vc ++ 6.0 MSCOMM进行串行通信，我必须从串行端口读取字节.
例如:
88 84 10 02(来自端口的4字节数据)
C6 1E 10 02(接收到的数据)，但是我必须显示88 84，但是我正在获取C6和1E，因为88 84是我无法读取的扩展ASCII码，请帮助.
我的代码是:

Hi i am using vc++ 6.0 MSCOMM for serial communication i have to read bytes and from serial port.
example :
88 84 10 02 (4 bytes data from port)
C6 1E 10 02 (Received Data) but i have to display 88 84 but i am getting C6 and 1E because 88 84 are the extended ASCII Codes which i am unable to read please help.
my code is:

VARIANT data;
BSTR k;
static char dbuff[4];
int dcount=0;
CString data;

if(m_mscom.GetCommEvent()==2){ // Receiving data from port
	data          = m_mscom.GetInput();
	k             = data.bstrVal;
	dbuff[dcount] = char (k[0]);
	dcount++;
	if(dcount == 4){
		dcount=0;
		data.Format ("%02X%02X%02X%02X",(unsigned char)dbuff[0],(unsigned char)dbuff[1],(unsigned char)dbuff[2],(unsigned char)dbuff[3]);
	}
}

推荐答案

几天前，您问了一个类似的问题，并得到了

You asked a similar question a few days ago, and got the suggestion[^] to not use CString and char variables; did you try that?

data.bstrVal返回一个BSTR-16位宽的utf-16

这是什么:dbuff [dcount] = char(k [0]);
我将其读取为:dbuff [0] = char(k [0]);您正在将一个字节大小的char设置为分配给k的BSTR中第一个unicode字符的8个最低有效位.

或缺少很多代码....

更新
TurboPower异步专业 [ ^ ]可以与C ++ Builder一起使用.有很多例子和好的文档.

也可以尝试 C ++ 2nd Edition中的思考 [

data.bstrVal returns a BSTR - 16-bit wide utf-16

What''s this: dbuff[dcount] = char (k[0]);
I read it as: dbuff[0] = char (k[0]); you are setting one byte sized char to the 8 least significant bits of the first unicode character in the BSTR assigned to k.

or there is a lot of code missing ....

Update
TurboPower Async Professional[^] can be used with C++ builder. There are lots of examples and good docs.

Also try Thinking in C++ 2nd Edition[^] by Bruce Eckel, Free Electronic Book
Volume 1 & Volume 2



Regards
Espen Harlinn

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