public int GetChecksum(ref Guid guidAlgorithm, CHECKSUM_DATA[] checksumData)
{
if (DocumentPosition != null)
{
return(DocumentPosition.GetChecksum(ref guidAlgorithm, checksumData));
}
else
{
checksumData[0].ByteCount = 0;
checksumData[0].pBytes = IntPtr.Zero;
return(HRConstants.E_FAIL);
}
}