i want to pass a struct by reference to a function in a c++ dll.

the problem is that the call causes an ArgumentException in the calling c#
code.
i already tried to use "out" instead of "ref" there was no exception
generated but i
saw in the unmanaged code all fields of the struct were uninitialized!
this is my c# code:

[StructLayout(LayoutKind.Sequential,Pack=1)]
struct WorldStats
{
public ObjectStats[] stats;
public int iterations;
public int living;
public WorldStats(int n)
{
stats = new ObjectStats[n];
iterations=0;
living=0;
}
}

[DllImport("aikernel.dll", CallingConvention=CallingConvention.Winapi)]
static extern void GetWorldStats(ref WorldStats ws);

WorldStats ws = new WorldStats(this.MAXOBJECTS);
GetWorldStats(ref ws); // here is the argumentexception thrown

the function in my c++ dll is declared as follows:
__declspec(dllexport) void /*WINAPI*/__stdcall GetWorldStats(WorldStats &
ws);

#pragma pack(push,1)
struct WorldStats
{
ObjectStats * stats;
int iterations;
int living;
};
#pragma pack(pop,1)

--
cody

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