I'm using a Background worker to read values in and to pass values to Worker_ProgressChanged, to update UI.
In Worker_DoWork:
while (agi.DvmReadyToRead) // wait for digipot to be adjusted before reading in worker
{
Thread.Sleep(20);
Application.DoEvents();
//logS.Debug("Waiting for ready to read in worker");
}
Thread.Sleep(40); // Give digipot chance to make the change
agi.SendSoftwareTriggerOne();
Thread.Sleep(7); // Duration for above command to execute
A = agi.ReadOne();
Thread.Sleep(1);
agi.InitOne();
Thread.Sleep(1);
sAndH3 = A[0];
worker.ReportProgress(0, new System.Tuple<double>(sAndH3));
agi.DvmReadyToRead = true;
In Worker_ProgressChanged:
while (!agi.DvmReadyToRead)
{
//logS.Debug("waiting for ready to read in progress");
Thread.Sleep(0);
Thread.Sleep(0);
Thread.Sleep(0);
Thread.Sleep(0);
Thread.Sleep(0);
Application.DoEvents(); // Exception thown here
Thread.Sleep(1); // wait for DVM reading
}
agi.DvmReadyToRead = false;
// Then goes on to adjust output voltage up or down
This is working fine the first time round using
Application.DoEvents();
however after first run, I get a stackoverflow at this point. After reading many posts on here DoEvents is not the best way of doing what I am trying to achieve. So what I would like is a way to pass a Boolean back to DoWork, or another way to allow worker to be able to read the agi.DvmReadyToRead Boolean.
Thanks!
If I understand your question, you are describing a very common pattern in Test and Measurement where you have an instrument that takes some time after triggering it before it gets a reading. But you want to know when the reading happens so that you can take some action (like update a ProgressBar or TextBox perhaps) and you want be able to cancel the worker loop.
When I need to do this myself, I like to use the System.Threading.Tasks to simplify things. I'll post a complete pattern here in the hope that you can find something of use to solve the issue you are having.
To be clear, I am trying to answer your question of "a way to pass a Boolean back to DoWork..." by saying that one way to do this is to fire an Event from Worker_DoWork that can contain Boolean (like you asked) or double (in my example) or any other information you choose.
Good luck!