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Marshaling a multi-dimensional array

I have a dll that is expecting a 3x3 array which I'm am using DllImport to access. In addition, this array is located in a struct that is getting passed. I'm having problems that I think are located somewhere in how I'm marshaling it. Any input would be appreciated.
(examples are shortened for clarity, let me know if something more complete would be useful)

/*C code*/
typedef float RotMtxType[3][3];
typedef struct {
double ccNum;
RotMtxType ccuGCCtoLNEDrot Mtx;
}

extern int ccuInitStateStr ucture(
CCUStateStruct *ccuStatePtr);

//C# Code
[StructLayout(La youtKind.Sequen tial)]
public struct CCUStateStruct
{

public double ccNum;
[MarshalAs(Unman agedType.ByValA rray, SizeConst=9]
public float [,] ccuGCCtoLNEDDro tMtx;
}

elsewhere ...
ccuState.ccuGCC toLNEDDrotMtx = new float[3,3]
....

[DllImport("CCU. dll")]
public extern static int ccuInitStateStr ucture (
[MarshalAs(Unman agedType.Struct )]ref CCUStateStruct ccuStatePtr);
I then get the error:
Additional information: Can not marshal field ccuGCCtoLNEDrot Mtx of type CCUStateStruct: This type can not be marshaled as a structure field.
Thanks much!
Tom
Nov 16 '05 #1
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