问题描述
好的..这会很长，但我需要先解释一些背景.
Ok..this will be lengthy but I need to explain some background first.
我软件的这一部分用于对沿着传送带运行的物品进行分类.我正在为传送带使用 Modbus.Modbus 将在特定时间打开大门，让物品通过大门.物品将根据重量通过某些门.
This part of my software is for sorting items running down a conveyor belt.I am using Modbus for the conveyor belt. Modbus will open gates at a specific time to let an item go through the gate. Items will go through certain gates based on weight.
我正在监控传感器以确定物品何时在秤上.当传感器被阻塞时，物品会被称重并发送到适当的门.计时器设置为打开/关闭大门.
I am monitoring a sensor to determine when an item is on a scale. When the sensor is blocked, the item is weighed and sent to the appropriate gate. Timers are set to open/close the gate.
我的代码适用于此..问题是，它不适用于多个项目.我的意思是，当门打开时，传感器不会被监控，直到门关闭.因此，当物品 A 正在前往登机口的途中，物品 B 在挡住传感器时不会在秤上称重.我一次最多可以有 8 个项目.这是我现在运行的代码:
My code will work for this..the problem is, it will not work for multiple items. By that I mean, while a gate is open the sensor is not being monitored until the gate is closed. So while Item A is on the way to the gate, Item B will not get weighed on the scale when it blocks the sensor. I could have up to 8 items on the line at once. Here is the code I am running now:
private void SensorThread_DoWork(object sender, DoWorkEventArgs e)
{
if (SensorThread.CancellationPending == true)
e.Cancel = true;
else
{
ReadSensor();
}
}
private void SensorThread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//if sensor is blocked
if (sensorstatus == 0)
{
//the timers just start the thread
scaleTimer.Start();
}
else
{
sensorTimer.Start();
}
}
private void ScaleThread_DoWork(object sender, DoWorkEventArgs e)
{
if (ScaleThread.CancellationPending == true)
{
e.Cancel = true;
}
else
{
ReadScale();
//SaveWeight();
prevgate = gate;
gate = DetermineGate();
SetOpenDelay();
SetDuration();
}
}
private void ScaleThread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//if gate = 0, this means the weight of meat on scale
//is not in any weight range. Meat runs off the end.
if (gate == 0)
{
txtStatus.Invoke(new UpdateStatusCallback(UpdateStatus), new object[] { meatweight.ToString() +
"lbs is out of range"});
sensorTimer.Start();
}
else
{
//open gate
//then close gate
}
}
这段代码工作正常，我只需要能够考虑多个项目就行了.有什么建议吗????
This code works fine, I just need to be able to account for multiple items on the line.Any suggestions????
我还尝试了以下方法:
private void SensorThread_DoWork(object sender, DoWorkEventArgs e)
{
if (SensorThread.CancellationPending == true)
e.Cancel = true;
else
{
ReadSensor();
}
}
private void SensorThread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
sensorTimer.Start();
}
private void ScaleThread_DoWork(object sender, DoWorkEventArgs e)
{
if (ScaleThread.CancellationPending == true)
{
e.Cancel = true;
}
else
{
//sensor blocked
if (sensorstatus == 0)
{
ReadScale();
//SaveWeight();
prevgate = gate;
gate = DetermineGate();
SetOpenDelay();
SetDuration();
//if gate = 0, this means the weight of meat on scale
//is not in any weight range. Meat runs off the end.
if (gate == 0)
{
txtStatus.Invoke(new UpdateStatusCallback(UpdateStatus), new object[] { meatweight.ToString() +
"lbs is out of range"});
}
else
{
//open gate
//close gate
}
}
}
private void ScaleThread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
scaleTimer.Start();
}
当我这样做时，我在按下开始按钮时启动了两个线程.我得到各种异常，程序最终抛出 SEHException 并崩溃.我得到的其他错误是串行端口已打开"或I/O 错误".
When I did this, I started both threads when the start button was pressed. I get all kinds of exceptions and the program eventually throws the SEHException and crashes. The other errors I get say "Serial port already opened" or "I/O Error".
推荐答案
我觉得你需要这样的东西.不知道是否需要锁，但为了安全起见，我添加了它们，因为您遇到错误
I think you need something like this. Don't know if the locks are needed but I added them for safety since you are getting errors
private void SensorThread_DoWork(object sender, DoWorkEventArgs e)
{
int sensor = 1;
while(!SensorThread.CancellationPending == true)
{
int newSensor;
lock(this)
{
newSensor = ReadSensor();
}
//sensor state changed
if(newSensor != sensor)
{
//sensor was 1 and changed to 0
if(newSensor==0)
{
scaleTimer.Start();
}
sensor = newSensor;
}
Thread.Sleep(1);
}
e.Cancel = true;
}
private void ScaleThread_DoWork(object sender, DoWorkEventArgs e)
{
//sensor blocked
//if (sensorstatus == 0)
{
lock(this)
{
ReadScale();
}
//SaveWeight();
prevgate = gate;
gate = DetermineGate();
lock(this)
{
SetOpenDelay();
SetDuration();
}
//if gate = 0, this means the weight of meat on scale
//is not in any weight range. Meat runs off the end.
if (gate == 0)
{
txtStatus.Invoke(new UpdateStatusCallback(UpdateStatus), new object[] { meatweight.ToString() +
"lbs is out of range"});
}
else
{
lock(this)
{
//open gate
}
lock(this)
{
//close gate
}
}
}
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