public ScpiIOResult Open(string visaAddress, bool exclusiveLock)
{
if (instrument != Visa.VI_NULL)
{
throw new Exception("IO is already open");
}
var res2 = Visa.viOpenDefaultRM(out rm);
if (res2 < 0)
{
return(MakeError(res2));
}
var res = Visa.viOpen(ScpiInstrument.GetResourceManager(), visaAddress, exclusiveLock ? Visa.VI_EXCLUSIVE_LOCK : Visa.VI_NO_LOCK, IOTimeoutMS, out instrument);
// Use sensible defaults
sendEnd = true;
useTermChar = false;
if (res >= 0)
{
SyncSettings();
}
else
{
instrument = Visa.VI_NULL;
}
return(MakeError(res));
}
[System.Runtime.ExceptionServices.HandleProcessCorruptedStateExceptions] // Required by .NET to catch AccessViolationException.
internal static int GetResourceManager()
{
try
{
if (visa_resource == Visa.VI_NULL && !visa_tried_load)
{
RaiseError2(Visa.viOpenDefaultRM(out visa_resource));
}
}
catch (Exception)
{
visa_tried_load = true;
}
return(visa_resource);
}