/// <summary>
/// Initializes and returns a blank SigInfoArray object containing numItems SigInfo objects.
/// </summary>
/// <param name="numItems">Number of SigInfo objects in SigInfoArray</param>
/// <param name="errMsg">Storage for verbose error messages, if any.</param>
/// <returns>A blank SigInfoArray object of dimension numItems.</returns>
public static WFDB_SiginfoArray GetSigInfoArray(int numItems, ref string errMsg)
{
WFDB_SiginfoArray siArray;
errMsg = "";
// First try opening the array:
try
{
siArray = new WFDB_SiginfoArray(numItems);
}
catch (Exception siarrayException)
{
while (siarrayException.InnerException != null)
{ // Drill down:
siarrayException = siarrayException.InnerException;
}
errMsg = siarrayException.ToString() + newLine;
MessageBox.Show("Exception occurred executing 'siArray = new WFDB_Siginfo()': \n"
+ siarrayException.ToString());
return(null);
}
// No exceptions -- init the array:
for (int i = 0; i < numItems; i++)
{
WFDB_Siginfo newInfo = new WFDB_Siginfo();
// 1234567890 234567890 234567890 234567890 234567890 234567890 234567890 234567890 234567890 234567890 234567890 234567890
// 1 2 3 4 5 6 7 8 9 10 11 12
newInfo.desc = " ";
newInfo.fname = " ";
newInfo.units = " ";
siArray.setitem(i, newInfo);
}
return(siArray);
}
/// <summary>
/// Override default behavior to:
/// - Save a local copy
/// - Get file header info
/// - Update iData accordingly
/// - Allow using header info to drive the output rates.
/// <para>NOTE: This method call GC.Collect() to force garbage collection on the
/// managed-code environment. If you are running unmanaged code, before calling
/// this method you must ensure that your unmanaged storage allocations are properly
/// protected or released.</para>
/// </summary>
public override void init(ChainInfo iData)
{
string errMsg = null;
// Reset THOROUGHLY:
GC.Collect();
GC.WaitForPendingFinalizers();
WfdbAccess.CloseWfdb();
GC.Collect();
GC.WaitForPendingFinalizers();
// Read record header:
siArray = WfdbAccess.GetSigInfoArray(numSignals, ref errMsg);
bool result = WfdbAccess.GetSignalInfo(recordName, siArray, numSignals, ref errMsg);
if (!result)
{
//System.Windows.Forms.MessageBox("Unable to access header for record '" + recordName + "' in path '" + searchPath + "'!");
Exception ex = new ArgumentException("Unable to access header for record '" + recordName + "' in path '" + searchPath + "'.");
throw ex;
}
// Read useful info from header:
WFDB_Siginfo sigInfo = siArray.getitem(0);
buffSize = sigInfo.spf;
frameBuffer = new int[buffSize];
numSamples = sigInfo.nsamp * sigInfo.spf;
sigName = sigInfo.desc;
//sampFreq = WfdbAccess.GetSamplingFrequency(recordName);
//if (sampFreq < 1)
//{ // Problem reading header!
// //System.Windows.Forms.MessageBox("Unable to access record '" + recordName + "' in path '" + searchPath + "'!");
// Exception ex = new ArgumentException("Unable to access header for record '" + recordName + "' in path '" + searchPath + "'.");
// throw ex;
//}
adcZeroRef = sigInfo.adczero;
adcResBits = sigInfo.adcres;
adcMaxValue = (int)Math.Pow(2, adcResBits);
baseline = sigInfo.baseline;
ampGain = sigInfo.gain;
if (ampGain == 0)
{ // Use default:
ampGain = 200;
}
dataUnits = sigInfo.units;
if ((dataUnits == null) || (dataUnits.Length == 0))
{ // Assign arbitrarily?
dataUnits = "mV";
}
// Save a local handle:
if (autoSend)
{ // Point to the input data structure:
initValues = iData;
}
else
{ // Make our own data structure:
initValues = new ChainInfo();
initValues.samplingPeriodSec = iData.samplingPeriodSec;
}
if (autoSend && doneReading) // We previously terminated the timer - restart it:
{ // Init the TimerThread:
sendTimer = new TimerThread(
new System.Threading.ThreadStart(this.next),
true);
}
// Init. what needs it:
dispSamples = 0; // just started, nothing retrieved yet
doneReading = false;
if (initValues.patientInfo == null)
{
initValues.patientInfo = new PatientInfo("", "", "");
}
if (initValues.dataInfo == null)
{
initValues.dataInfo = new DataInfo(sigInfo.desc, DateTime.Now.ToString());
}
// And, apply the REAL values:
initValues.dataInfo.BitsPerSample = adcResBits;
initValues.dataInfo.ScaleMultiplier = ampGain.ToString();
if (adcResBits == 0)
{ // Missing some info -- go with a default:
initValues.dataInfo.FullScaleReferenceVoltage = "2.0";
initValues.dataInfo.ZeroOffset = "0.0";
initValues.dataInfo.ZeroReferenceVoltage = "-2.0";
}
else
{
initValues.dataInfo.FullScaleReferenceVoltage = ((adcMaxValue - baseline) / ampGain).ToString();
initValues.dataInfo.ZeroOffset = baseline.ToString();
initValues.dataInfo.ZeroReferenceVoltage = (-baseline / ampGain).ToString();
}
initValues.dataInfo.ValueUnits = dataUnits;
if (initValues.fileInfo == null)
{
initValues.fileInfo = new FileHandler();
}
if (initValues.samplingPeriodSec != stepSize)
{
// Update the sampling period:
initValues.samplingPeriodSec = stepSize;
}
//// Init. the sampling period:
//this.stepSize = initValues.samplingPeriodSec;
// Init output buffer:
ReadBuffer();
// Apply values and propagate downstream:
base.init(iData); // iData may have been changed or not
}
