How to convert IStream(C++) to System::IO::Stream(c#) and vice versa

[Sowmya Dantuluri]

I have 2 libraries one is written in c++ and the other one is written in c#.

Name of C++ library ->LibA

Name of C# library ->LibB

In LibA, 2 main APIs will be there:

1. Serialize-> Serialize API will generate IStream as output with the given inputs.
2. Deserialize-> Deserialize API will take IStream as input and deserializes the stream and gets actual data from it.

struct GPosition
{
double x;
double y;
double z;
};
struct GUnitVector
{
double x;
double y;
double z;
};
struct GLine
{
GPosition m_rootPoint; /* Point on the line, should be in region of interest */
GUnitVector m_direction; /* Gradient */
double m_start; /* Parameter of start point, must be <= m_end */
double m_end; /* Parameter of end point */
};



class GraphicSerializer
{
public:

GUID objectID;

uint32_t aspectID;
uint32_t controlFlag;
vector<const GLine *> geomVector;

void Serialize(IStream &pStream);
void Deserialize(IStream* pStream);
};


In LibB, 4 APIs will be there:

1. Object GetObjectFromStream(Stream s)-> Takes stream as input and deserializes it and returns Objects
2. PutToDB(Object A)-> persists the given object to DB
3. Stream GetStreamFromObject(Object a)-> Takes object as input serializes it and returns it.
4. Object GetFromDB(objectID)-> Gets the object from DB based on id

public class CommonBase
{
public Guid id { get; set; };
public byte[] Bytes { get; set; } //contains aspect, control flag, vector<GLine>
};

public interface IGraphicRepository
{
CommonBase Get(Guid guid);
bool Put(CommonBase graphic);
}

public static class GraphicStreamUtility
{
public static CommonBase GetCommonBaseFromStream(Stream stream);
public static void SerializeCommonBaseToStream(CommonBase obj, Stream stream);
}

Now I'm writing C++/CLI to use stream generated by libA in libB and vice versa. So that I can persist and retrieve the objects to and from DB.

Can anyone please let me know how to convert IStream to .Net Stream and .Net stream to IStream.

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