/// <summary>
/// Find all available instruments.
/// </summary>
private void Find()
{
// Find all available VISA-over-USB devices.
IEnumerable <string> devices = VisaDevice.Find(VisaPattern.USB);
// Remove all items.
comboBoxResources.Items.Clear();
// Add found items.
foreach (string d in devices)
{
comboBoxResources.Items.Add(d);
}
// Select the first item.
comboBoxResources.SelectedIndex = 0;
}
public void Open()
{
// The device uses a USB VISA interface, so look for devices with that pattern.
string[] resourceStrings = VisaDevice.Find(VisaPattern.USB).ToArray();
string errorMessage = string.Empty;
bool success = false;
// Try each resource, and use the first one that opens successfully.
foreach (string resouceName in resourceStrings)
{
bool status = true;
try
{
// Open a connection to the desired instrument.
Open(resouceName);
}
catch (DeviceCommunicationException ex)
{
// Save the error message to display to the user later.
errorMessage = ex.Message;
// Note that the instrument didn't open.
status = false;
}
// Stop when one of the resource strings connects successfully.
if (status == true)
{
success = true;
break;
}
}
// If none of the resource strings yielded an instrument connection, throw
// an exception.
if (success == false)
{
throw new DeviceCommunicationException("Device was not found."
+ Environment.NewLine + "Details:"
+ Environment.NewLine + errorMessage);
}
}