STDMETHODIMP CLabInput::GetSingleValues(VARIANT* values)
{
AUTO_LOCK; // Should not be needed inserted on a whim
if (!_isConfig)
DAQ_CHECK(Configure(FORSINGLEVALUE));
// 3 SCANS IS THE MIN with scan_op
SAFEARRAY *ps = SafeArrayCreateVector(VT_I2, 0, _nChannels*2);
if (ps==NULL) return E_SAFEARRAY_ERR;
// set the data type and values
V_ARRAY(values)=ps;
V_VT(values)=VT_ARRAY | VT_I2;
TSafeArrayAccess <short > binarray(values);
if (_nChannels<=2)
{
for (int i=0; i<_nChannels; i++)
{
DAQ_CHECK(AI_Read(_id, _chanList[i], _gainList[i], &binarray[i]));
}
}
else
{
// setup the channels to read and scan them
DAQ_TRACE(Set_DAQ_Device_Info(_id, ND_DATA_XFER_MODE_AI, ND_INTERRUPTS));
short *dummy=(short*)_alloca(_nChannels*sizeof(short));
DAQ_CHECK(Lab_ISCAN_Op(_id,static_cast<i16>(_nChannels),_gainList[0],&binarray[0],
_nChannels, 1.0/_chanSkew,0,dummy));
}
return S_OK;
}
void main(void)
{
/*
* Local Variable Declarations:
*/
i16 iStatus = 0;
i16 iRetVal = 0;
i16 iDevice = 1;
i16 iOnDevChan = 0;
i16 iOnDevGain = 1;
i16 iReading = 0;
i16 iChassisID = 1;
i16 iModuleSlot = 1;
i16 iModuleChan = 0;
f64 dSCXIgain = 1.0;
f64 dTermBlockGain = 1.0;
f64 dSCXIvoltage = 0.0;
i16 iIgnoreWarning = 0;
iStatus = SCXI_Load_Config(iChassisID);
iRetVal = NIDAQErrorHandler(iStatus, "SCXI_Load_Config",
iIgnoreWarning);
/* Specify SCXI module and channel to sample. */
iStatus = SCXI_Single_Chan_Setup(iChassisID, iModuleSlot,
iModuleChan, iDevice);
iRetVal = NIDAQErrorHandler(iStatus, "SCXI_Single_Chan_Setup",
iIgnoreWarning);
/* You can call SCXI_Set_Gain before AI_Read to change the gain on
the SCXI module or SCXI channel, depending on what the module allows.
Otherwise, SCXIgain is assumed to be 1.0. */
/* Some modules require that you call SCXI_Get_Status after
changing gain but before taking a reading to make sure the gain has
switched. The delay call below should then be replaced with
SCXI_Get_Status. */
iRetVal = NIDAQDelay(1.0);
/* If you are using an SCXI-1140 module, call
SCXI_Track_Hold_Control to put the module in 'Hold' mode at this
point. */
iStatus = AI_Read(iDevice, iOnDevChan, iOnDevGain, &iReading);
iRetVal = NIDAQErrorHandler(iStatus, "AI_Read", iIgnoreWarning);
/* If you are using an SCXI-1140 module, call
SCXI_Track_Hold_Control to put the module in 'Track' mode at this
point. */
/* If you call SCXI_Set_Gain before AI_Read, make sure to change
the 'dSCXIgain' in SCXI_Scale. */
iStatus = SCXI_Scale(iChassisID, iModuleSlot, iModuleChan,
dSCXIgain, dTermBlockGain, iDevice, iOnDevChan, iOnDevGain, 1,
&iReading, &dSCXIvoltage);
iRetVal = NIDAQErrorHandler(iStatus, "SCXI_Scale",
iIgnoreWarning);
printf(" The SCXI voltage is %lf volts.\n", dSCXIvoltage);
}
