/// <summary>
/// Syncronously obtains a directory of the log sessions on a device,
/// including file format information. Will throw exceptions if there is
/// an error in communication or gaining access to the com port.
/// </summary>
/// <param name="portName">The comport string to use to communicate withe the device.</param>
/// <returns>A session directory structure representing the device.</returns>
public static SessionDirectory SyncGetSessionDirectory(string portName)
{
string fileVersion = string.Empty;
List <Session> list = new List <Session>();
Session session = null;
try
{
Open(portName);
bool ok = true;
ValidChunk lastValidChunk = null;
bool error = false;
bool reportError = false;
int offset = 0;
var riff = Read(offset, 12, out ok);
if (ok == false)
{
// Retry
nakRetryCount++;
riff = Read(offset, 12, out ok);
if (ok == false)
{
throw new Exception("Cant read bioharness");
}
}
var strRiff = Encoding.ASCII.GetString(riff, 0, 4);
if (strRiff.ToUpper().Equals("RIFF") == false)
{
throw new Exception("Not a RIFF Chunk");
}
var tLength = BitConverter.ToInt32(riff, 4);
/* DateTimeFormatInfo to parse DateTime */
IFormatProvider culture = new CultureInfo("en-NZ", false);
bool cancel = false;
offset = 12;
while (cancel == false)
{
if (offset >= tLength)
{
break;
}
riff = Read(offset, 8, out ok);
if (ok == false)
{
nakRetryCount++;
riff = Read(offset, 8, out ok);
if (ok == false)
{
throw new Exception("Cant read Bioharness");
}
}
offset += 8;
int ckLength = BitConverter.ToInt32(riff, 4);
string chunk;
try
{
error = false;
chunk = Encoding.ASCII.GetString(riff, 0, 4);
switch (chunk)
{
case "JUNK": /* JUNK */
lastValidChunk = new ValidChunk(offset, "JUNK");
offset += ckLength;
/* We can have JUNK between logh and logr, so don't reset session to null here */
break;
case "zphr": /* zphr */
lastValidChunk = new ValidChunk(offset, "zphr");
var zphr = Read(offset, ckLength, out ok);
if (ok == false)
{
nakRetryCount++;
zphr = Read(offset, ckLength, out ok);
if (ok == false)
{
throw new Exception("Cant read bioharness");
}
}
fileVersion = Encoding.ASCII.GetString(zphr, 4, 4);
offset += ckLength;
session = null;
break;
case "fms ": /* fms */
lastValidChunk = new ValidChunk(offset, "fms");
offset += ckLength;
session = null;
break;
case "logr": /* logr */
{
lastValidChunk = new ValidChunk(offset, "logr");
if (session == null)
{
error = true;
}
else
{
/* Calculate and round milliseconds */
session.Duration = TimeSpan.FromMilliseconds((((ckLength - session.PadBytes) / (session.Channels * 2)) - 1) * session.Period);
/* Because we have nothing to compare too, a single element comes up as zero */
if (session.Duration == TimeSpan.FromSeconds(0))
{
session.Duration = TimeSpan.FromSeconds(1);
}
session.Offset = offset + session.PadBytes;
session.Length = ckLength - session.PadBytes;
list.Add(session);
}
offset += ckLength;
}
session = null;
break;
case "logh":
case "log1":
case "log2": /* logh */
{
lastValidChunk = new ValidChunk(offset, "logh");
var logh = Read(offset, ckLength, out ok);
if (ok == false)
{
nakRetryCount++;
logh = Read(offset, ckLength, out ok);
if (ok == false)
{
throw new Exception("Cant read bioharness");
}
}
int period = BitConverter.ToInt16(logh, 8);
period = (period == 0) ? 1008 : period;
int channels = BitConverter.ToInt16(logh, 12);
int padRaw = BitConverter.ToInt16(logh, 14);
/* DateTime format should be invariant from the culture in USA Month and Day are reverse. */
DateTime timestamp = DateTime.Parse(
string.Format(
"{0}/{1}/{2} {3}",
logh[3],
logh[2],
logh[1] * 256 + logh[0],
TimeSpan.FromMilliseconds(BitConverter.ToInt32(logh, 4)).ToString()),
culture);
session = new Session(timestamp, channels, padRaw);
session.Period = period;
offset += ckLength;
}
break;
default:
error = true;
session = null;
break;
}
}
catch (Exception ex)
{
/* This usually means device unplugged */
error = true;
throw new IOException("Sorry problem reading data.", ex);
}
if (error == true)
{
/* Only report each block of errors once */
if (reportError == false)
{
System.Diagnostics.Debug.WriteLine(string.Format("Error at: 0x{0:x8}, continuing ...", offset));
reportError = true;
offset = lastValidChunk.Offset;
}
offset -= 8;
int length = 2048 - (offset % 2048);
offset += length;
}
else
{
reportError = false;
}
}
Close();
}
catch (Exception ex)
{
try
{
Close();
}
catch
{
}
throw new IOException("Sorry problem reading data.", ex);
}
return(new SessionDirectory(list.ToArray(), fileVersion));
}
/// <summary>
/// Syncronously obtains a directory of the log sessions on a device,
/// including file format information. Will throw exceptions if there is
/// an error in communication or gaining access to the com port.
/// </summary>
/// <param name="portName">The comport string to use to communicate withe the device.</param>
/// <returns>A session directory structure representing the device.</returns>
public static SessionDirectory SyncGetSessionDirectory(string portName)
{
string fileVersion = string.Empty;
List<Session> list = new List<Session>();
Session session = null;
try
{
Open(portName);
bool ok = true;
ValidChunk lastValidChunk = null;
bool error = false;
bool reportError = false;
int offset = 0;
var riff = Read(offset, 12, out ok);
if (ok == false)
{
// Retry
nakRetryCount++;
riff = Read(offset, 12, out ok);
if (ok == false)
{
throw new Exception("Cant read bioharness");
}
}
var strRiff = Encoding.ASCII.GetString(riff, 0, 4);
if (strRiff.ToUpper().Equals("RIFF") == false)
{
throw new Exception("Not a RIFF Chunk");
}
var tLength = BitConverter.ToInt32(riff, 4);
/* DateTimeFormatInfo to parse DateTime */
IFormatProvider culture = new CultureInfo("en-NZ", false);
bool cancel = false;
offset = 12;
while (cancel == false)
{
if (offset >= tLength)
{
break;
}
riff = Read(offset, 8, out ok);
if (ok == false)
{
nakRetryCount++;
riff = Read(offset, 8, out ok);
if (ok == false)
{
throw new Exception("Cant read Bioharness");
}
}
offset += 8;
int ckLength = BitConverter.ToInt32(riff, 4);
string chunk;
try
{
error = false;
chunk = Encoding.ASCII.GetString(riff, 0, 4);
switch (chunk)
{
case "JUNK": /* JUNK */
lastValidChunk = new ValidChunk(offset, "JUNK");
offset += ckLength;
/* We can have JUNK between logh and logr, so don't reset session to null here */
break;
case "zphr": /* zphr */
lastValidChunk = new ValidChunk(offset, "zphr");
var zphr = Read(offset, ckLength, out ok);
if (ok == false)
{
nakRetryCount++;
zphr = Read(offset, ckLength, out ok);
if (ok == false)
{
throw new Exception("Cant read bioharness");
}
}
fileVersion = Encoding.ASCII.GetString(zphr, 4, 4);
offset += ckLength;
session = null;
break;
case "fms ": /* fms */
lastValidChunk = new ValidChunk(offset, "fms");
offset += ckLength;
session = null;
break;
case "logr": /* logr */
{
lastValidChunk = new ValidChunk(offset, "logr");
if (session == null)
{
error = true;
}
else
{
/* Calculate and round milliseconds */
session.Duration = TimeSpan.FromMilliseconds((((ckLength - session.PadBytes) / (session.Channels * 2)) - 1) * session.Period);
/* Because we have nothing to compare too, a single element comes up as zero */
if (session.Duration == TimeSpan.FromSeconds(0))
{
session.Duration = TimeSpan.FromSeconds(1);
}
session.Offset = offset + session.PadBytes;
session.Length = ckLength - session.PadBytes;
list.Add(session);
}
offset += ckLength;
}
session = null;
break;
case "logh":
case "log1":
case "log2": /* logh */
{
lastValidChunk = new ValidChunk(offset, "logh");
var logh = Read(offset, ckLength, out ok);
if (ok == false)
{
nakRetryCount++;
logh = Read(offset, ckLength, out ok);
if (ok == false)
{
throw new Exception("Cant read bioharness");
}
}
int period = BitConverter.ToInt16(logh, 8);
period = (period == 0) ? 1008 : period;
int channels = BitConverter.ToInt16(logh, 12);
int padRaw = BitConverter.ToInt16(logh, 14);
/* DateTime format should be invariant from the culture in USA Month and Day are reverse. */
DateTime timestamp = DateTime.Parse(
string.Format(
"{0}/{1}/{2} {3}",
logh[3],
logh[2],
logh[1] * 256 + logh[0],
TimeSpan.FromMilliseconds(BitConverter.ToInt32(logh, 4)).ToString()),
culture);
session = new Session(timestamp, channels, padRaw);
session.Period = period;
offset += ckLength;
}
break;
default:
error = true;
session = null;
break;
}
}
catch (Exception ex)
{
/* This usually means device unplugged */
error = true;
throw new IOException("Sorry problem reading data.", ex);
}
if (error == true)
{
/* Only report each block of errors once */
if (reportError == false)
{
System.Diagnostics.Debug.WriteLine(string.Format("Error at: 0x{0:x8}, continuing ...", offset));
reportError = true;
offset = lastValidChunk.Offset;
}
offset -= 8;
int length = 2048 - (offset % 2048);
offset += length;
}
else
{
reportError = false;
}
}
Close();
}
catch (Exception ex)
{
try
{
Close();
}
catch
{
}
throw new IOException("Sorry problem reading data.", ex);
}
return new SessionDirectory(list.ToArray(), fileVersion);
}
