/// <summary>
/// Find and open a Delcom device. this.deviceHandle is set upon success.
/// </summary>
/// <returns>true on success.</returns>
private bool OpenDevice()
{
if (this.deviceHandle != InvalidDevcieHandle)
{
this.CloseDevice();
}
StringBuilder deviceName = new StringBuilder(Delcom.MAXDEVICENAMELEN);
// Search for the first match USB device, For USB IO Chips use Delcom.USBIODS
// With Generation 2 HID devices, you can pass a TypeId of 0 to open any Delcom device.
int findResult = Delcom.DelcomGetNthDevice(Delcom.USBDELVI, 0, deviceName);
if (findResult == 0)
{
Trace.TraceError("Device was not found");
}
else
{
uint newDeviceHandle = Delcom.DelcomOpenDevice(deviceName, 0);
if (newDeviceHandle == InvalidDevcieHandle)
{
Trace.TraceError("Device was found, but failed to be connected. device = {0}", deviceName.ToString());
}
else
{
this.deviceHandle = newDeviceHandle;
// Disable auto confirmation mode where the buzzer will sound when the button is pressed.
Delcom.DelcomEnableAutoConfirm(this.deviceHandle, 0);
}
}
return(this.deviceHandle != InvalidDevcieHandle);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="stateMachineInputCallback">delegate to call when there's an event to report</param>
public DelcomLight(MainAppLogic.EnqueueStateMachineInput stateMachineInputCallback, TimeSpan holdTime)
{
hUSB = DelcomLightWrapper.TryOpeningDelcomDevice();
Delcom.DelcomEnableAutoConfirm(hUSB, 0);
// Make sure we always start turned off
DelcomLightWrapper.DelcomLEDAllAction(hUSB, DelcomLightWrapper.LightStates.Off);
// remember the delegate so we can invoke when we get input
this.stateMachineInputCallback = stateMachineInputCallback;
//Initialize hold threshold from argument passed from Main
this.holdThreshold = holdTime;
// start a background thread to poll the device for input
BackgroundWorker bgw1 = new BackgroundWorker();
bgw1.DoWork += delegate { this.BackgroundPollingWorker(); };
bgw1.RunWorkerAsync();
}
