public static void MyCallback(int bd, MccDaq.EventType et, uint sampleCount, IntPtr pUserData)
{
//MyCallback is a static member function. So, we must do some work to get the reference
// to this object. Recall that we passed in a pointer to a struct that wrapped the
// class reference as UserData.
TUserData userStruct = (TUserData)Marshal.PtrToStructure(pUserData, typeof(TUserData));
frmEventDisplay ThisObj = (frmEventDisplay)userStruct.ThisObj;
//Calculate the index of the latest sample in the buffer.
int sampleIdx = ((int)sampleCount - 1) % ThisObj.TotalCount;
ushort[] rawData = new ushort[1];
uint[] rawData32 = new uint[1];
float voltData;
double highResVoltData;
ThisObj.lblSampleCount.Text = sampleCount.ToString();
//Retrieve the latest sample and convert it to engineering units.
if (ThisObj.ADResolution > 16)
{
MccDaq.MccService.WinBufToArray32(ThisObj.MemHandle, rawData32, (int)sampleIdx, 1);
ThisObj.DaqBoard.ToEngUnits32(ThisObj.Range, rawData32[0], out highResVoltData);
ThisObj.lblLatestSample.Text = highResVoltData.ToString("F5") + " V";
}
else
{
MccDaq.MccService.WinBufToArray(ThisObj.MemHandle, rawData, (int)sampleIdx, 1);
ThisObj.DaqBoard.ToEngUnits(ThisObj.Range, rawData[0], out voltData);
ThisObj.lblLatestSample.Text = voltData.ToString("F4") + " V";
}
if (et == MccDaq.EventType.OnEndOfAiScan)
{
// If the event is the end of acquisition, release the
// resources in preparation for the next scan.
ThisObj.DaqBoard.StopBackground(MccDaq.FunctionType.AiFunction);
if (ThisObj.chkAutoRestart.Checked)
{
int rate = ThisObj.DesiredRate;
ThisObj.DaqBoard.AInScan(0, 0, ThisObj.TotalCount, ref rate,
ThisObj.Range, ThisObj.MemHandle, ThisObj.Options);
}
else
{
ThisObj.lblStatus.Text = "IDLE";
ThisObj.cmdStart.Enabled = true;
}
}
}
public static void OnScanError(int bd, MccDaq.EventType et, uint scanError, IntPtr pdata)
{
//OnScanError is a static member function. So, we must do some work to get the reference
// to this object. Recall that we passed in a pointer to a struct that wrapped the
// class reference as UserData...
TUserData thisStruct = (TUserData)Marshal.PtrToStructure(pdata, typeof(TUserData));
frmEventDisplay ThisObj = (frmEventDisplay)thisStruct.ThisObj;
ThisObj.DaqBoard.StopBackground(MccDaq.FunctionType.AiFunction);
// Reset the chkAutoRestart such that the 'OnEndOfAiScan' event does
//not automatically start a new scan
ThisObj.chkAutoRestart.Checked = false;
}