FP SDK 5.14. Rapid Data Value Changed Event.

SAV · August 2012

Dear sirs,

Could someone shed some light to the the logic of the rapid data changing event triggering.

I have a PERS variable and have a subscribtion on the data changing.

Here it is:

public void SubscribeMethodOnRapidData(string rdName, Action<ControllerDataToComponent> method)

{

_rapidsMap.Add(rdName, method);

_controller.Rapid.GetRapidData("T_ROB1", "ProgressModule", rdName).ValueChanged += rd_changed;

}

private void rd_changed(object sender, DataValueChangedEventArgs e)

{

if (sender is RapidData)

{

MessageBox.Show("RapidData has changed!");

string rdName = ((RapidData)sender).Name;

Action<ControllerDataToComponent> method = _rapidsMap[rdName];

ControllerDataToComponent sgnToComponent = new ControllerDataToComponent();

sgnToComponent.dataValue = GetRapidData(rdName).ToString();

method.Invoke(sgnToComponent);

}

else

MessageBox.Show("sender is not RapidData!");

}

During the execution the value of the rapid variable changes many times, but I have no event triggering. Why? What I had missed? It works perfect with the signals...

Thank you in advance...

P.S. I'm using the virtual controller

SAV2012-09-03 06:57:42

John Wiberg · September 2012

Hi SAV,

Got your message so here I am

First here is an example which I ran just now which works, you need three buttons and a TpsLabel, and then the declaration of the ctrl and myRD needs to be at the top of the class declaration.

[code]

        private void btnSub_Click(object sender, EventArgs e)
        {
            myRD = ctrl.Rapid.GetRapidData("T_ROB1", "Module1", "myNum");
            this.myRD.ValueChanged += myRD_ValueChanged;
        }
        private void myRD_ValueChanged(object sender, DataValueChangedEventArgs e)
        {
            this.Invoke(new EventHandler(ToTheLabel), sender, e);
        }
        private void ToTheLabel(object sender, System.EventArgs e)
        {
            if (this.tpsLabel1.Text == "")
            {
                this.tpsLabel1.Text = DateTime.Now.ToString() + " : " + myRD.Value.ToString();
            }
            else
            {
                this.tpsLabel1.Text = this.tpsLabel1.Text + "
" + DateTime.Now.ToString() + " : " + myRD.Value.ToString();
            }
        }
        private void btnClear_Click(object sender, EventArgs e)
        {
            tpsLabel1.Text = "";
        }

[/code]

Regarding your code, first your use of the windows messagebox is a no-no, you should be using the GTPUMessageBox instead.

I'll go through the rest later.

John Wiberg · September 2012

Sorry, had to do some other stuff in between. OK lets look at your code.
1) Can't see your other stuff, so I really can't say regarding your calls like _rapidsMap
2) In the event [rd_changed] you have code that make UI changes (MessageBox.Show) before the invoke. Wouldn't it be better to just send along the sender and e and then do the strings and sgnToComponent execution in the invoked method. See Working with RAPID data and Controller events and threads
In my example above you see that I use that in the [myRD_ValueChanged], which invokes [ToTheLabel].
3) what do you use the delegate for?
Action<ControllerDataToComponent>
Can't make sense of that.

SAV · September 2012

You was right, it works. The key point was the following: the variable myRd must be not local.

Thank you, John.

lubosko105 · March 2021

Hi guys.
is it possible to fire event also for 'Signal' (I/O system), but not only PERS Rapid variable?

FP SDK 5.14. Rapid Data Value Changed Event.

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