问在C#中使用VisaNS和NI-488.2库处理GPIB SRQ

EN

using NationalInstruments.VisaNS;

public class Datalogger
{
    private string resourceName = "";                       // The VISA resource name used to access the hardware
    private ResourceManager resourceManager = null;
    private GpibSession session = null;                     // The VISA session used to communicate with the hardware

    public Datalogger(string resourceName)
    {
        resourceManager = ResourceManager.GetLocalManager();
        session = (GpibSession)resourceManager.Open(resourceName);
        session.ReaddressingEnabled = true;
        // Check the device ID string
        session.Write("*IDN?");
        string reply = session.ReadString();
// Detail left out
        // Add our SRQ event handler and enable events of type ServiceRequest
        session.ServiceRequest += OnSRQ;        
        session.EnableEvent(MessageBasedSessionEventType.ServiceRequest, EventMechanism.Handler);
    }

// Other methods & properties omitted

    private void OnSRQ(Object sender, MessageBasedSessionEventArgs e)
    // Handle an SRQ from the datalogger
    {
        if (e.EventType == MessageBasedSessionEventType.ServiceRequest)
        {
            session.Write("*STB?");
            string temp = session.ReadString();
            int result = Int32.Parse(temp);
            if ((result & 128) == 128)
            {
                session.Write("STAT:OPER:EVEN?");
                temp = session.ReadString();
                result = Int32.Parse(temp);
                if ((result & 512) == 512)
                {
                    session.Write("DATA:POIN?");
                    string response = session.ReadString();
                    int count = Int32.Parse(response);
                    if (count != 0)
                    {
                        session.Write(string.Concat("DATA:REM? ", count.ToString()));
                        response = session.ReadString();
                        System.Console.WriteLine(response);
                    }
                }
            }
        }
        session.Write("*SRE 192");  // Try re-enabling SRQ
    }
}