需要暂停以允许使用C#中的数据 [英] Need a pause to allow for data in C#

问题描述

大家好，
我需要延迟才能允许设备通过串行端口进行响应(这与星期一询问的有关for循环未循环或似乎不响应的问题有关)我需要延迟以允许回复处理.我正在尝试使用下面详述的那种功能:

Hi All,
I need a delay I can call to allow for a device to respond over a Serial port (this is related to a question asked on Monday about a for loop not looping or appearing not to) I need a delay to allow for a reply to be processed. I was trying to use a function of the sort detailed below:

public int WaitForData(int NbDataToWait, int Timeout)
{
    int timeWaited = 0;
    int timeToWait = 1; // 1 ms
    while (timeWaited < Timeout && MyCompPort.BytesToRead < NbDataToWait)
    {
        timeWaited += timeToWait;
        System.Threading.Thread.Sleep(timeToWait );

    }

    return timeWaited;

}

从Romain Taillandier看来，这似乎锁定了表格，并导致Thread.Sleep或我的厚度过大而无法正确使用它.当您调用它时，我以预期的字节数(例如15)和超时的值(例如30(mS))给出了WaitForData(15,30).它需要一个值，因为它需要传递一个整数，因为它不是无效值，

from Romain Taillandier this appears to lock the form and cause a problem the way Thread.Sleep or am I being thick and not using it correctly. I read it as you call it with the number of bytes you are expecting say 15 and the value of time out say 30 (mS) giving WaitForData(15,30). It needs a Value as it''s needs an integer passed to it as it is not to a void,

 int Value;   // off up declarations 
Value = WaitForData(15,30);

对吗?
我让自己感到迷惑的是它的一小部分效果.....

Glenn

right??
I am getting myself confused one miniute it works........

Glenn

推荐答案

首先，在处理Thread.Sleep时，不会发生任何其他事情，包括数据到达.其次，睡眠持续时间为1几乎等于20-25毫秒的最小持续时间，因为调用和处理睡眠所花费的时间超过了1毫秒，更不用说CPU上的时钟了具有在短时间内睡眠的分辨率.

First, While your Thread.Sleep is processing, nothing else can happen, including the arrival of data. Second, a Sleep duration of 1 is pretty much going to end up as a duration of a minimum oif 20-25 milliseconds because it takes longer that 1 millisecond to call and process sleep, not to mention the clock on the cpu doesn''t have the resolution to sleep for such a short period of time.

Thread.Sleep永远不要在UI线程(即主线程)上使用，因为它将阻止采取任何其他措施位置-鼠标单击，按键，计时器等.

而是设置 SerialPort.ReadTimeout [ ^ ]大约是您通常收到的整个邮件的两倍，并处理 SerialPort .DataReceived [ ^ ]和 SerialPort.ErrorReceived [ ^ ]活动.在收到的数据中，收集字符，直到获得完整的消息.如果您收到错误接收事件，那么您将不会收到完整的消息.

现在，您完全不必等待输入-您只需在数据到达时就可以使用它，就像其他Windows处理一样.

Thread.Sleep should never be used on the UI thread (ie, the main thread) as it will prevent any other actions taking place - mouse clicks, key presses, timers, etc.

Instead, set a SerialPort.ReadTimeout[^] to a period about twice what you would normally receive the whole message in, and handle the SerialPort.DataReceived[^] and SerialPort.ErrorReceived[^] Events. In the data received, collect the characters until you have a complete message. If you get the error received event, then you didn''t get the whole message.

Now, you don''t have to wait for input at all - you can just work with the data when it arrives, like other windows processing.

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