Convert C# struct to VARIENT

[dileep]

I got an ArgumentException while calling
Marshal.GetNativeVariantForObject(segInfo, resultVar);

The exception detailis {"Value does not fall within the expected range."}


I have a C# struct as follows

[StructLayout(LayoutKind.Sequential)]

public struct segmentInfo_st

{ public int nSegID;

public int nSegFillOrder;

public int nSelectFlag;

public int nGraficDispFlag;

public int nImgTextDispFlag;

public int nScalBarDispFlag;

public int nShutterDispFlag;

public int nSummaryFlag;

public int nNoteFlag;

public ArrayList segList;

}



I tried it to convert to VARIENT using Marshal.GetNativeVariantForObject


like
IntPtr resultVar;

segmentInfo_st segInfo = new segmentInfo_st();

segInfo.nSegID = 1;

int sz = Marshal.SizeOf(typeof(segmentInfo_st));

resultVar = Marshal.AllocCoTaskMem(sz);



Marshal.GetNativeVariantForObject(segInfo, resultVar);

Expecting early help .

Thanks & regards,
Dileep S