public void WriteHeader()
{
StockHeader header = new StockHeader();
header.SharedMemorySize = SharedMemorySize;
header.UsedMemorySize = UsedMemorySize;
header.FreeMemorySize = FreeMemorySize;
header.ItemCapacity = ItemCapacity;
header.ItemCount = ItemCount;
header.ItemSize = ItemSize;
header.StockId = StockId;
header.SectorId = SectorId;
header.Shutdown = 0;
View.Write(HeaderOffset, header);
}
public void ReadHeader()
{
object _header = new object();
View.Read(HeaderOffset, _header, typeof(StockHeader));
StockHeader header = (StockHeader)_header;
int headerSize = Marshal.SizeOf(typeof(StockHeader));
BufferSize = header.SharedMemorySize - headerSize;
UsedSize = header.UsedMemorySize - headerSize;
FreeSize = header.FreeMemorySize - headerSize;
ItemCapacity = header.ItemCapacity;
ItemSize = header.ItemSize;
ItemCount = header.ItemCount;
StockId = header.StockId;
SectorId = header.SectorId;
}
public void InitHeader()
{
if (!IsOwnerOfSharedMemory)
{
return;
}
StockHeader header = new StockHeader();
header.SharedMemorySize = SharedMemorySize;
header.UsedMemorySize = Marshal.SizeOf(typeof(StockHeader));
header.FreeMemorySize = SharedMemorySize - header.UsedMemorySize;
header.ItemSize = (ItemType != null && ItemSize > 0) ? ItemSize : -1;
header.ItemCapacity = (ItemType != null && ItemSize > 0) ? (header.FreeMemorySize / ItemSize) : -1;
header.ItemCount = -1;
header.Shutdown = 0;
View.Write(HeaderOffset, header);
}
public void PreReadHeader()
{
using (MemoryMappedViewAccessor headerView =
Mmf.CreateViewAccessor(0, HeaderOffset + Marshal.SizeOf(typeof(StockHeader)), MemoryMappedFileAccess.Read))
{
byte *headerPtr = null;
headerView.SafeMemoryMappedViewHandle.AcquireIntPtr(ref headerPtr);
StockHeader *_header = (StockHeader *)(headerPtr + HeaderOffset);
StockHeader header = (StockHeader)Marshal.PtrToStructure((IntPtr)_header, typeof(StockHeader));
int headerSize = Marshal.SizeOf(typeof(StockHeader));
BufferSize = header.SharedMemorySize - headerSize;
UsedSize = header.UsedMemorySize - headerSize;
FreeSize = header.FreeMemorySize - headerSize;
ItemCapacity = header.ItemCapacity;
ItemSize = header.ItemSize;
ItemCount = header.ItemCount;
StockId = header.StockId;
SectorId = header.SectorId;
headerView.SafeMemoryMappedViewHandle.ReleaseIntPtr();
}
}
