private void buttonConstellation_Click(object sender, EventArgs e)
{
if (buttonConstellation.Text == "Constellation")
{
lock (constellationLock)
{
if (constellation == null)
{
constellation = new Constellation();
// First time only, check that matlab folder exists
if (!File.Exists(Constellation.constellationExecutable ))
{
MessageBox.Show("The Matlab program is not present, at: " + Constellation.constellationExecutable
+ "\n\nUse Properties / Constellation page to select a different Matlab executable or location.",
"DAN PTP - Installation Error",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
constellation = null;
return;
}
}
buttonConstellation.Text = "Close Plot";
} // unlocked
// Get constellation data, write files and launch Matlab on a worker thread.
// It's possible (try double-clicking "Constellation" button) that the worker
// has already been started, so only invoke RunWorker when not busy:
if (!bgWrkConstellation.IsBusy)
{
bgWrkConstellation.RunWorkerAsync();
}
}
else
{
stopConstellation();
}
}
/*
* Must be reentrant, can be called by the gui or the background worker
* at the RunWorkerCompleted method.
*/
private void stopConstellation()
{
// Sometimes, will block processing of the button from 'off' to 'on',
// but if we don't block here, constellation.shutDown can happen at
// the same time that the bgWrk thread is iterating PhyConstellationData
// objects, registering with pcap, etc.
lock (constellationLock)
{
if (constellation != null)
{
constellation.shutDown();
}
buttonConstellation.Text = "Constellation";
constellation = null;
// Don't need to cancel the background task; just let
// it finish. It will detect null constellation
// during RunWorkerCompleted.
}
}
