public int GetNextKey()
{
int RecordPointer = int.MaxValue;
#region
try
{
CurrentKey++;
if (CurrentKey == NumberOfKeys)
{
CurrentKey = (int)NumberOfKeys - 1;
return(-2);
}
RecordPointer = RecordOffset + CurrentKey * RecordSize;
FileStreamData.Seek(RecordPointer, 0);
Key = BinaryReaderData.ReadString();
Flag = BinaryReaderData.ReadBoolean();
Value = BinaryReaderData.ReadString();
return(RecordPointer);
}
catch (Exception e)
{
StringLastError = e.Message;
return(-3);
}
#endregion
}
public int GetPrevKey()
{
int RecordPointer = int.MaxValue;
#region
try
{
CurrentKey--;
if (CurrentKey < 0)
{
CurrentKey = 0;
return(-1);
}
RecordPointer = RecordOffset + CurrentKey * RecordSize;
FileStreamData.Seek(RecordPointer, 0);
Key = BinaryReaderData.ReadString();
Flag = BinaryReaderData.ReadBoolean();
Value = BinaryReaderData.ReadString();
return(RecordPointer);
}
catch (Exception e)
{
StringLastError = e.Message;
return(-3);
}
#endregion
}
public uint FindKey(string P_key)
{
uint RecordPointer = uint.MaxValue, IndexPointer = uint.MaxValue;
KeyBytes = ASCIIEncoding.UTF8.GetBytes(P_key);
ByteIndex = 0;
IndexOffset = 0;
for (ByteIndex = 0; ByteIndex < KeyBytes.Length; ByteIndex++)
{
#region
count++;
IndexPosition = (uint)(IndexOffset + (KeyBytes[ByteIndex] - 32) * 8);
try
{
FileStreamIdx.Seek(IndexPosition, 0);
RecordPointer = BinaryReaderIdx.ReadUInt32();
IndexPointer = BinaryReaderIdx.ReadUInt32();
if (IndexPointer == uint.MaxValue)
{
return(uint.MaxValue);
}
FileStreamData.Seek(RecordPointer, 0);
Key = BinaryReaderData.ReadString();
Flag = BinaryReaderData.ReadBoolean();
Value = BinaryReaderData.ReadString();
if (Key.Equals(P_key) && !Flag)
{
return(RecordPointer);
}
else
{
IndexOffset = IndexPointer;
}
}
catch (Exception e)
{
StringLastError = e.Message;
return(uint.MaxValue);;
}
#endregion
}
return(uint.MaxValue);
}
