SerialPort.DataReceived事件执行逻辑 [英] SerialPort.DataReceived Event Execution Logic

问题描述

嘿大家。



我有一个问题要问。



我想知道每当数据来自serialPort时，DataReceived事件会自动引发？我已阅读但无法在此处找到信息：



http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.datareceived.aspx [ ^ ]



我写了一个小程序，每3秒从串口读取一次数据，但这样做不太安静。



代码如下：





Hey everyone.

I've a question to ask.

I'm wondering that the DataReceived event is automatically raised whenever a data comes from serialPort? I've read but couldn't find info here:

http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.datareceived.aspx[^]

I've written a little program to read data every 3 seconds from serial port, but that doesn't work quiet well.

The code is below:

string buffer;

SerialPort sp = new SerialPort("COM1");

sp.BaudRate = 9600;
sp.Handshake = Handshake.None;

// Handler
sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    buffer= sp.ReadExisting();
}

我不想使用Timer，因为数据并不总是以3秒的间隔到达。所以，我无法获得精确的数据。



我知道这是一个简单的问题，但我被卡住了......

任何想法如何间隔阅读？

我最好的问候...

I don't want to use Timer, because the data doesn't always arrive in 3 second intervals. So, I can't get precise datas.

I know this's a simple question, but I'm stuck...
Any idea how to read with intervals?
My best regards...

推荐答案

如果你想以特定的间隔阅读，那么使用一个计时器。

如果你想要处理数据，请使用DataRecieved。



但请注意，DataReceived每次都会被触发字节到达 - 因此您每次读取的数据可能都是单个字符，如果您在每次处理事件时都覆盖它，缓冲区将永远不会保留整个消息。

If you want to read at specific intervals, then use a Timer.
If you want to process data as it comes in, use DataRecieved.

But be aware that DataReceived is fired every time a byte arrives - so the data you read is likely to be a single character each time, and "buffer" will never hold an entire message if you overwrite it every time you handle the event.

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