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COM interop: how to use ICustomMarshaler to call 3rd party component

long GetPrecursorInfoFromScanNum(long nScanNumber,

LPVARIANT pvarPrecursorInfos,

LPLONG pnArraySize)

       

struct PrecursorInfo

{

    double dIsolationMass;

    double dMonoIsoMass;

    long nChargeState;

    long nScanNumber;

};

 

void CTestOCXDlg::OnOpenParentScansOcx()

{

    VARIANT vPrecursorInfos;

    VariantInit(&vPrecursorInfos);

    long nPrecursorInfos = 0;

 

    m_Rawfile.GetPrecursorInfoFromScanNum(m_nScanNumber,

        &vPrecursorInfos,

        &nPrecursorInfos);

 

    // Access the safearray buffer

    BYTE* pData;

    SafeArrayAccessData(vPrecursorInfos.parray, (void**)&pData);

    for (int i=0; i < nPrecursorInfos; ++i)

    {

        // Copy the scan information from the safearray buffer

        PrecursorInfo info;

        memcpy(&info,

        pData + i * sizeof(MS_PrecursorInfo),

        sizeof(PrecursorInfo));

    }

    SafeArrayUnaccessData(vPrecursorInfos.parray);

}

       

void GetPrecursorInfoFromScanNum(int nScanNumber, ref object pvarPrecursorInfos, ref int pnArraySize);

       

[Guid("06F53853-E43C-4F30-9E5F-D1B3668F0C3C")]

[TypeLibType(4160)]

[ComImport]

public interface IInterfaceNew : IInterfaceOrig

{

    [DispId(130)]

    int GetPrecursorInfoFromScanNum(int nScanNumber, [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(MyMarshaler))] ref object pvarPrecursorInfos, ref int pnArraySize);

}