/// <summary>
/// Записать изменения таблицы срезов в файл или поток
/// </summary>
public void Update(SrezTable srezTable)
{
if (srezTable == null)
{
throw new ArgumentNullException("srezTable");
}
Stream stream = null;
BinaryWriter writer = null;
try
{
stream = ioStream == null ?
new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite) :
ioStream;
writer = new BinaryWriter(stream);
// запись изменённых срезов
foreach (SrezTable.Srez srez in srezTable.ModifiedSrezList)
{
stream.Seek(srez.Position + 8, SeekOrigin.Begin);
writer.Write(GetCnlDataBuf(srez.CnlData));
}
// установка позиции записи добавленных срезов в поток,
// восстановление таблицы срезов в случае необходимости
SrezTable.Srez lastSrez = srezTable.LastStoredSrez;
if (lastSrez == null)
{
stream.Seek(0, SeekOrigin.Begin);
}
else
{
stream.Seek(0, SeekOrigin.End);
long offset = lastSrez.Position + lastSrez.CnlNums.Length * 9 + 8;
if (stream.Position < offset)
{
byte[] buf = new byte[offset - stream.Position];
stream.Write(buf, 0, buf.Length);
}
else
{
stream.Seek(offset, SeekOrigin.Begin);
}
}
// запись добавленных срезов
SrezTable.SrezDescr prevSrezDescr = lastSrez == null ? null : lastSrez.SrezDescr;
foreach (SrezTable.Srez srez in srezTable.AddedSrezList)
{
// запись номеров каналов среза
if (srez.SrezDescr.Equals(prevSrezDescr))
{
writer.Write(EmptyCnlNumsBuf);
}
else
{
writer.Write(GetSrezDescrBuf(srez.SrezDescr));
}
prevSrezDescr = srez.SrezDescr;
// запись данных среза
srez.Position = stream.Position;
writer.Write(ScadaUtils.EncodeDateTime(srez.DateTime));
writer.Write(GetCnlDataBuf(srez.CnlData));
lastSrez = srez;
}
// подтверждение успешного сохранения изменений
srezTable.AcceptChanges();
srezTable.LastStoredSrez = lastSrez;
}
finally
{
if (fileMode)
{
if (writer != null)
{
writer.Close();
}
if (stream != null)
{
stream.Close();
}
}
}
}
/// <summary>
/// Write changes to the slicing table to a file or stream.
/// </summary>
public void Update(SrezTable srezTable)
{
if (srezTable == null)
{
throw new ArgumentNullException(nameof(srezTable));
}
Stream stream = null;
BinaryWriter writer = null;
try {
stream = ioStream ?? new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write,
FileShare.ReadWrite);
writer = new BinaryWriter(stream);
// record modified slices
foreach (var srez in srezTable.ModifiedSrezList)
{
stream.Seek(srez.Position + 8, SeekOrigin.Begin);
writer.Write(GetCnlDataBuf(srez.CnlData));
}
// setting the recording position of the added slices to the stream,
// restore slice table if necessary
var lastSrez = srezTable.LastStoredSrez;
if (lastSrez == null)
{
stream.Seek(0, SeekOrigin.Begin);
}
else
{
stream.Seek(0, SeekOrigin.End);
long offset = lastSrez.Position + lastSrez.CnlNums.Length * 9 + 8;
if (stream.Position < offset)
{
var buf = new byte[offset - stream.Position];
stream.Write(buf, 0, buf.Length);
}
else
{
stream.Seek(offset, SeekOrigin.Begin);
}
}
// record added slices
var prevSrezDescr = lastSrez?.SrezDescr;
foreach (var srez in srezTable.AddedSrezList)
{
// recording cutoff channel numbers
writer.Write(srez.SrezDescr.Equals(prevSrezDescr)
? EmptyCnlNumsBuf
: GetSrezDescrBuf(srez.SrezDescr));
prevSrezDescr = srez.SrezDescr;
// slice data entry
srez.Position = stream.Position;
writer.Write(ScadaUtils.EncodeDateTime(srez.DateTime));
writer.Write(GetCnlDataBuf(srez.CnlData));
lastSrez = srez;
}
// confirmation of successful saving of changes
srezTable.AcceptChanges();
srezTable.LastStoredSrez = lastSrez;
} finally {
if (fileMode)
{
writer?.Close();
stream?.Close();
}
}
}