Nedd help with marshaling:

have this struct in C:

typedef struct OB{
unsigned char        bC;
unsigned char   bR;
unsigned short                wC;
VARBLK(MAX_SIZE)        Im;
VARBLK(MAX_SIZE)        Te;
} OB;

With VARBLK defined like this:

typedef struct tagVARBLKHDR {
int iSize;
} VARBLKHDR;

#define VARBLK(size) \
struct { \
VARBLKHDR Hdr; \
unsigned char Array[(size)]; \
}

#define VARBLK_SIZEOF(arraysize) \
(sizeof(VARBLK(arraysize)))

#define VARBLK_SIZE(block) \
((block).Hdr.iSize)

#define VARBLK_PTR(block) \
((block).Array)

#ifdef __cplusplus
}

Can anyone help me in some choices to marshal that?

I has tryed many things like:

public struct VARBLK
{
public VARBLKHDR Hdr;
[MarshalAs(UnmanagedType.SafeArray)]
public byte[] Array;
}
[StructLayout(LayoutKind.Auto, CharSet = CharSet.Ansi)]
public struct VARBLKHDR
{
public int iSize;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct OB
{
public byte bC;
public byte bR;
public short wC;
public IntPtr Im;
public IntPtr Te;
}

then doing

IntPtr aux=((OB)(oo)).Im;
object pp = Marshal.PtrToStructure(aux,typeof(VARBLK));

But it keeps giving to me a lot of xception...
THanks in advance for any help