Question

我正在尝试控制一台测试设备，我需要对测试设备进行正确的测序。

首先我打电话给StartGettingTraceData()。然后在将来的某个时间我会调用StopGettingTraceData()来尝试结束GetTraceData()函数，而不是重新启动它。但这绝不会发生。事实上，我从未到达DoneTraces.Set()行，所以bool timedOut = !DoneTraces.WaitOne(10000)行，timedOut总是如此;

private static AutoResetEvent DoneTraces = new AutoResetEvent(false);

private void GetTraceData()
{
    byte[] receivedbytes = new byte[1];
    if (Connection.ReadData(receivedbytes) && receivedbytes[0] == 192)
        ProcessIncomingTrace();

    Thread.Sleep(100);

    if (RunTraceQueryWorker)
        new Thread(GetTraceData).Start();
    else
    {
        Thread.Sleep(200);
        DoneTraces.Set();
    }
}

private void StartGettingTraceData()
{
    RunTraceQueryWorker = true;
    new Thread(GetTraceData).Start();
}

private bool StopGettingTraceData()
{
    RunTraceQueryWorker = false;
    bool timedOut = !DoneTraces.WaitOne(10000);
    return timedOut;
}

有关正在发生的事情的任何想法？

修改

这是我的Connection.ReadData（...）函数。顺便说一下，这是一个串行连接。

public bool ReadData(byte[] responseBytes)
{
    int bytesExpected = responseBytes.Length, offset = 0, bytesRead;
    while (bytesExpected > 0 && (bytesRead = MySerialPort.Read(responseBytes, offset, bytesExpected)) > 0)
    {
        offset += bytesRead;
        bytesExpected -= bytesRead;
    }
    return bytesExpected == 0;
}

Answer 1

您应该使用while循环查看您的条件，而不是再次重复调用GetTraceData：

private static AutoResetEvent DoneTraces = new AutoResetEvent(false);

private void GetTraceData()
{
    do
{
    byte[] receivedbytes = new byte[1];
    if (Connection.ReadData(receivedbytes) && receivedbytes[0] == 192)
        ProcessIncomingTrace();

    Thread.Sleep(100);
}
while (RunTraceQueryWorker)

Thread.Sleep(200);
DoneTraces.Set();

}

private void StartGettingTraceData()
{
    RunTraceQueryWorker = true;
    new Thread(GetTraceData).Start();
}

private bool StopGettingTraceData()
{
    RunTraceQueryWorker = false;
    bool timedOut = !DoneTraces.WaitOne(10000);
    return timedOut;
}

如果不了解ReadData＆amp; ProcessIncomingTrace()做。

Answer 2

好吧，ReadData来电可能会被阻止。顺便说一下，你用这些递归线程让自己变得很难......你不能只使用一个循环吗？

private void GetTraceData()
{
    byte[] receivedbytes = new byte[1];

    while( RunTraceQueryWorker )
    {
        if( Connection.ReadData(receivedbytes) && receivedbytes[0] == 192 )
        {
            ProcessIncomingTrace();
        }
        Sleep(100);
    }

    Thread.Sleep(200);
    DoneTraces.Set();
}

为什么这个帖子不会结束？

2 个答案: