/// <summary>
/// Создать таблицу, состоящую из одного среза, в файле или потоке
/// </summary>
/// <remarks>Для записи таблицы текущего среза</remarks>
public void Create(SrezTable.Srez srez, DateTime srezDT)
{
if (srez == null)
{
throw new ArgumentNullException("srez");
}
Stream stream = null;
BinaryWriter writer = null;
try
{
stream = ioStream == null ?
new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite) :
ioStream;
writer = new BinaryWriter(stream);
writer.Write(GetSrezDescrBuf(srez.SrezDescr));
writer.Write(Arithmetic.EncodeDateTime(srezDT));
writer.Write(GetCnlDataBuf(srez.CnlData));
stream.SetLength(stream.Position);
}
finally
{
if (fileMode)
{
if (writer != null)
{
writer.Close();
}
if (stream != null)
{
stream.Close();
}
}
}
}
/// <summary>
/// Создать буфер для записи события
/// </summary>
protected byte[] CreateEventBuffer(EventTableLight.Event ev)
{
byte[] evBuf = new byte[EventDataSize];
Array.Copy(BitConverter.GetBytes(Arithmetic.EncodeDateTime(ev.DateTime)), 0, evBuf, 0, 8);
evBuf[8] = (byte)(ev.ObjNum % 256);
evBuf[9] = (byte)(ev.ObjNum / 256);
evBuf[10] = (byte)(ev.KPNum % 256);
evBuf[11] = (byte)(ev.KPNum / 256);
evBuf[12] = (byte)(ev.ParamID % 256);
evBuf[13] = (byte)(ev.ParamID / 256);
evBuf[14] = (byte)(ev.CnlNum % 256);
evBuf[15] = (byte)(ev.CnlNum / 256);
Array.Copy(BitConverter.GetBytes(ev.OldCnlVal), 0, evBuf, 16, 8);
evBuf[24] = (byte)ev.OldCnlStat;
Array.Copy(BitConverter.GetBytes(ev.NewCnlVal), 0, evBuf, 25, 8);
evBuf[33] = (byte)ev.NewCnlStat;
evBuf[34] = ev.Checked ? (byte)1 : (byte)0;
evBuf[35] = (byte)(ev.UserID % 256);
evBuf[36] = (byte)(ev.UserID / 256);
string descr = ev.Descr ?? "";
if (descr.Length > MaxDescrLen)
{
descr = descr.Substring(0, MaxDescrLen);
}
evBuf[37] = (byte)descr.Length;
Array.Copy(Encoding.Default.GetBytes(descr), 0, evBuf, 38, descr.Length);
string data = ev.Data ?? "";
if (data.Length > MaxDataLen)
{
data = data.Substring(0, MaxDataLen);
}
evBuf[138] = (byte)data.Length;
Array.Copy(Encoding.Default.GetBytes(data), 0, evBuf, 139, data.Length);
return(evBuf);
}
/// <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(Arithmetic.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>
/// Записать таблицу dataTable в файл или поток
/// </summary>
public void Update(DataTable dataTable)
{
if (dataTable == null)
{
throw new ArgumentNullException("dataTable");
}
Stream stream = null;
BinaryWriter writer = null;
try
{
stream = ioStream == null ?
new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.ReadWrite) :
ioStream;
writer = new BinaryWriter(stream, Encoding.Default);
// запись заголовка
byte fieldCnt = dataTable.Columns.Count > byte.MaxValue ?
byte.MaxValue : (byte)dataTable.Columns.Count;
writer.Write(fieldCnt);
writer.Write((ushort)0); // резерв
if (fieldCnt > 0)
{
// формирование и запись определений полей
FieldDef[] fieldDefs = new FieldDef[fieldCnt];
int recSize = 2; // размер строки в файле
byte[] fieldDefBuf = new byte[FieldDefSize];
fieldDefBuf[FieldDefSize - 1] = fieldDefBuf[FieldDefSize - 2] = 0; // резерв
for (int i = 0; i < fieldCnt; i++)
{
FieldDef fieldDef = new FieldDef();
DataColumn col = dataTable.Columns[i];
Type type = col.DataType;
if (type == typeof(int))
{
fieldDef.DataType = DataTypes.Integer;
fieldDef.DataSize = sizeof(int);
fieldDef.MaxStrLen = 0;
}
else if (type == typeof(double))
{
fieldDef.DataType = DataTypes.Double;
fieldDef.DataSize = sizeof(double);
fieldDef.MaxStrLen = 0;
}
else if (type == typeof(bool))
{
fieldDef.DataType = DataTypes.Boolean;
fieldDef.DataSize = 1;
fieldDef.MaxStrLen = 0;
}
else if (type == typeof(DateTime))
{
fieldDef.DataType = DataTypes.DateTime;
fieldDef.DataSize = sizeof(double);
fieldDef.MaxStrLen = 0;
}
else // String
{
fieldDef.DataType = DataTypes.String;
int maxLen = Math.Min(col.MaxLength, MaxStringLen);
fieldDef.DataSize = 2 /*запись длины*/ + Encoding.UTF8.GetMaxByteCount(maxLen);
fieldDef.MaxStrLen = maxLen;
}
fieldDef.Name = col.ColumnName;
fieldDef.AllowNull = col.AllowDBNull;
recSize += fieldDef.DataSize;
if (fieldDef.AllowNull)
{
recSize++;
}
fieldDefs[i] = fieldDef;
fieldDefBuf[0] = (byte)fieldDef.DataType;
Array.Copy(BitConverter.GetBytes((ushort)fieldDef.DataSize), 0, fieldDefBuf, 1, 2);
Array.Copy(BitConverter.GetBytes((ushort)fieldDef.MaxStrLen), 0, fieldDefBuf, 3, 2);
fieldDefBuf[5] = fieldDef.AllowNull ? (byte)1 : (byte)0;
ConvertStr(fieldDef.Name, MaxFieldNameLen, MaxFieldNameDataSize,
fieldDefBuf, 6, Encoding.ASCII);
writer.Write(fieldDefBuf);
}
// запись строк
byte[] rowBuf = new byte[recSize];
rowBuf[0] = rowBuf[1] = 0; // резерв
foreach (DataRowView rowView in dataTable.DefaultView)
{
DataRow row = rowView.Row;
int bufInd = 2;
foreach (FieldDef fieldDef in fieldDefs)
{
int colInd = dataTable.Columns.IndexOf(fieldDef.Name);
object val = colInd >= 0 ? row[colInd] : null;
bool isNull = val == null || val == DBNull.Value;
if (fieldDef.AllowNull)
{
rowBuf[bufInd++] = isNull ? (byte)1 : (byte)0;
}
switch (fieldDef.DataType)
{
case DataTypes.Integer:
int intVal = isNull ? 0 : (int)val;
Array.Copy(BitConverter.GetBytes(intVal), 0, rowBuf, bufInd, fieldDef.DataSize);
break;
case DataTypes.Double:
double dblVal = isNull ? 0.0 : (double)val;
Array.Copy(BitConverter.GetBytes(dblVal), 0, rowBuf, bufInd, fieldDef.DataSize);
break;
case DataTypes.Boolean:
rowBuf[bufInd] = (byte)(isNull ? 0 : (bool)val ? 1 : 0);
break;
case DataTypes.DateTime:
double dtVal = isNull ? 0.0 : Arithmetic.EncodeDateTime((DateTime)val);
Array.Copy(BitConverter.GetBytes(dtVal), 0, rowBuf, bufInd, fieldDef.DataSize);
break;
default:
string strVal = isNull ? "" : val.ToString();
ConvertStr(strVal, fieldDef.MaxStrLen, fieldDef.DataSize,
rowBuf, bufInd, Encoding.UTF8);
break;
}
bufInd += fieldDef.DataSize;
}
writer.Write(rowBuf);
}
}
}
finally
{
if (fileMode)
{
if (writer != null)
{
writer.Close();
}
if (stream != null)
{
stream.Close();
}
}
}
}
