static extern IMalloc CoGetMalloc(uint dwMemContext);

IMalloc

/// C# definition of the IMalloc interface.

internal interface IMalloc

    /// This method returns the size, in bytes, of a memory block previously allocated with IMalloc::Alloc or IMalloc::Realloc.

    /// 0 - not allocated by this IMalloc Instance.

Public Interface IMalloc

    ''' This method returns the size, in bytes, of a memory block previously allocated with IMalloc::Alloc or IMalloc::Realloc.

    ''' <returns>1 - allocated 0 - not allocated by this IMalloc Instance.</returns>

static extern int SHGetMalloc(out IMalloc ppMalloc);

IMalloc pMalloc;

System.Type mallocType = typeof(IMalloc);

pMalloc = (IMalloc)obj;