Beispiel #1
0
        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;
                }
            }
        }
Beispiel #2
0
        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;
        }