public void RemoveObject(string ObjName)
{
//get the main mmf table and remove the key
MemoryMappedFile map = new MemoryMappedFile();
if (map.OpenEx(ObjectNamesMMF + ".nat", MapProtection.PageReadWrite, ObjectNamesMMF, MapAccess.FileMapAllAccess))
{
BinaryFormatter bf = new BinaryFormatter();
MapViewStream mmfStream = map.MapView(MapAccess.FileMapRead, 0, 0, "");
mmfStream.Position = 0;
Hashtable oFilesMap = bf.Deserialize(mmfStream) as Hashtable;
oFilesMap.Remove(ObjName);
mmfStream.Close();
//update the main file
bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, oFilesMap);
MapViewStream stream = map.MapView(MapAccess.FileMapAllAccess, 0, (int)0, "");
stream.Position = 0;
stream.Write(ms.GetBuffer(), 0, (int)ms.Length);
stream.Flush();
stream.Close();
//delete the map of the object
MemoryMappedFile oMMf = new MemoryMappedFile();
if (oMMf.Open(MapAccess.FileMapAllAccess, ObjName))
{
oMMf.Close();
oMMf.Dispose();
}
if (System.IO.File.Exists(map.GetMMFDir() + ObjName + ".nat"))
{
System.IO.File.Delete(map.GetMMFDir() + ObjName + ".nat");
}
}
}
/// <summary>
/// create a MMF and serialize the object in to.
/// </summary>
/// <param name="InObject"></param>
/// <param name="obectName"></param>
/// <param name="ObjectSize"></param>
private void WriteObjectToMMF(object InObject, string obectName, int ObjectSize)
{
MemoryStream ms = new MemoryStream();
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(ms, InObject);
oMutex.WaitOne();
MemoryMappedFile map = new MemoryMappedFile(obectName + ".nat", MapProtection.PageReadWrite, MapAccess.FileMapAllAccess, ms.Length, obectName);
MapViewStream stream = map.MapView(MapAccess.FileMapAllAccess, 0, (int)ms.Length, "");
stream.Write(ms.GetBuffer(), 0, (int)ms.Length);
stream.Flush();
stream.Close();
oMutex.ReleaseMutex();
}
/// <summary>
/// this function will
/// 1) open exsisting (if not create) MMF that hold all the MMf names for each object
/// 2) look if aname allready exist
/// 3) if exist
/// -Delete the MMF
/// -create new MMF
/// -Enter the onject into
/// if not
/// -create new MMF
/// -Enter the onject into
/// -enter the new name and MMF name into MMF of object and MMF name
/// </summary>
/// <param name="objName"></param>
/// <param name="inObject"></param>
public void AddObject(string objName, object inObject, bool UpdateDomain)
{
MemoryMappedFile map = new MemoryMappedFile();
System.Collections.Hashtable oFilesMap;
System.IntPtr oAtom = System.IntPtr.Zero;
string strIps = "";
try
{
if (!map.OpenEx(ObjectNamesMMF + ".nat", MapProtection.PageReadWrite, ObjectNamesMMF, MapAccess.FileMapAllAccess))
{
//Create MMF for the object and serialize it
WriteObjectToMMF(inObject, objName, 0);
//create hashtable
oFilesMap = new System.Collections.Hashtable();
//add object name and mmf name to hash
oFilesMap.Add(objName, objName);
//create main MMF
WriteObjectToMMF(oFilesMap, ObjectNamesMMF, 0);
}
else
{
BinaryFormatter bf = new BinaryFormatter();
Stream mmfStream = map.MapView(MapAccess.FileMapRead, 0, 0, "");
mmfStream.Position = 0;
oFilesMap = bf.Deserialize(mmfStream) as Hashtable;
long StartPosition = mmfStream.Position;
if (oFilesMap.ContainsKey(objName))
{
//name exist so we need to
// open the MMF of the existing and update it
MemoryMappedFile MemberMap = new MemoryMappedFile();
oMutex.WaitOne();
MemberMap.OpenEx(objName + ".nat", MapProtection.PageReadWrite, objName, MapAccess.FileMapAllAccess); //(MapAccess.FileMapAllAccess ,objName);
MapViewStream stream = MemberMap.MapView(MapAccess.FileMapAllAccess, 0, (int)0, "");
bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, inObject);
stream.Position = 0;
stream.Write(ms.GetBuffer(), 0, (int)ms.Length);
stream.Flush();
stream.Close();
oMutex.ReleaseMutex();
}
else
{
//name not apear so we nedd to
// craete new MMF file and serialize
WriteObjectToMMF(inObject, objName, 0);
oMutex.WaitOne();
MapViewStream stream = map.MapView(MapAccess.FileMapAllAccess, 0, (int)0, "");
// update the main HashTable
oFilesMap.Add(objName, objName);
// serialize new Hash
bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, oFilesMap);
stream.Position = 0;
stream.Write(ms.GetBuffer(), 0, (int)ms.Length);
stream.Flush();
stream.Close();
oMutex.ReleaseMutex();
}
}
}
catch (Exception e)
{
throw new Exception("Cannot Open File " + objName, e);
}
finally
{
Win32MapApis.GlobalDeleteAtom(oAtom);
}
}