private CaptureInfo GetCapture(ScannerType scannerType, CancellationToken token)
{
Log.DebugFormat("GetCapture(scannerType={0}, token={1}) called",
scannerType, token);
CaptureInfo captureInfo = null;
DataRequestResult result = DataRequestResult.None;
bool isRunning = true;
int attempts = 0;
while (isRunning)
{
// Check if cancellation requested
token.ThrowIfCancellationRequested();
// First query the database to get an image file name.
CaptureDb captureCandidate = GetCaptureFromDatabase(scannerType);
if (captureCandidate != null)
{
// Try to find an image file using the file name.
byte[] imageData;
bool isFound = TryGetImageFromName(captureCandidate.HumanId, out imageData);
if (isFound)
{
// Matching file found.
Log.DebugFormat("Matching file found for capture={0}", captureCandidate.HumanId);
isRunning = false;
captureInfo = new CaptureInfo(
captureCandidate.Id,
imageData,
captureCandidate.GoldTemplate);
result = DataRequestResult.Success;
}
else
{
// Give up if the number of attemps exceeds limit.
attempts++;
if (attempts > MAX_OPEN_FILE_ATTEMPTS)
{
Log.WarnFormat("Exceeded maximum number of file searches (attempts={0})",
attempts);
isRunning = false;
result = DataRequestResult.Failed;
}
}
}
else
{
// Queries are not returning any more candidates, give up immediately.
Log.Warn("No candidate filename obtained from the database");
result = DataRequestResult.Failed;
break;
}
}
IntegrityCheck.AreNotEqual(DataRequestResult.None, result);
return(captureInfo);
}
public override void OnEnteringState()
{
base.OnEnteringState();
Outer.OnUserActionRequired(new UserActionRequiredEventArgs(SET_ANGLE_PROMPT));
// Get the minutia that was placed in the previous step
IntegrityCheck.AreNotEqual(0, Outer.Minutae.Count());
m_Record = Outer.Minutae.Last();
IntegrityCheck.IsNotNull(m_Record.Position);
}