public UCAC3Entry GetStarBy3U(int zone, int record)
{
IntPtr buffer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(UCAC3Entry)));
try
{
string fileName;
fileName = Path.Combine(m_CatalogLocation, string.Format("z{0}", zone.ToString("000")));
long positionFrom = (record - 1) * UCAC3Entry.Size;
using (FileStream str = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BinaryReader rdr = new BinaryReader(str))
{
rdr.BaseStream.Position = positionFrom;
UCAC3Entry entry = new UCAC3Entry();
byte[] rawData = rdr.ReadBytes(UCAC3Entry.Size);
Marshal.Copy(rawData, 0, buffer, Marshal.SizeOf(entry));
entry = (UCAC3Entry)Marshal.PtrToStructure(buffer, typeof(UCAC3Entry));
entry.InitUCAC3Entry((ushort)zone, 0);
return entry;
}
}
}
finally
{
Marshal.FreeHGlobal(buffer);
}
}
private void LoadStars(SearchZone zone, double limitMag, List<IStar> starsFromThisZone)
{
List<LoadPosition> searchIndexes = m_Index.GetLoadPositions(zone);
IntPtr buffer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(UCAC3Entry)));
try
{
foreach (LoadPosition pos in searchIndexes)
{
string fileName;
fileName = Path.Combine(m_CatalogLocation, string.Format("z{0}", pos.ZoneId.ToString("000")));
long positionFrom = (pos.FromRecordId - 1) * UCAC3Entry.Size;
uint firstStarNoToRead = pos.FirstStarNoInBin + pos.FromRecordId;
uint numRecords = pos.ToRecordId - pos.FromRecordId;
using (FileStream str = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BinaryReader rdr = new BinaryReader(str))
{
rdr.BaseStream.Position = positionFrom;
for (int i = 0; i <= numRecords; i++, firstStarNoToRead++)
{
UCAC3Entry entry = new UCAC3Entry();
byte[] rawData = rdr.ReadBytes(UCAC3Entry.Size);
Marshal.Copy(rawData, 0, buffer, Marshal.SizeOf(entry));
entry = (UCAC3Entry)Marshal.PtrToStructure(buffer, typeof(UCAC3Entry));
entry.InitUCAC3Entry((ushort)pos.ZoneId, firstStarNoToRead);
if (entry.Mag > limitMag) continue;
if (entry.RAJ2000 < zone.RAFrom) continue;
if (entry.RAJ2000 > zone.RATo) continue;
if (entry.DEJ2000 < zone.DEFrom) continue;
if (entry.DEJ2000 > zone.DETo) continue;
starsFromThisZone.Add(entry);
}
}
}
}
}
finally
{
Marshal.FreeHGlobal(buffer);
}
}