// Getting inconsistent results. Need to work on code.
public Bitmap GetThumbnail()
{
Bitmap bitmap = null;
PROPVARIANT propvar = default(PROPVARIANT);
try
{
Marshal.ThrowExceptionForHR(GetPropertyValue(FMTID.FMTID_ExtendedSummaryInformation, (uint)ExtendedSummaryInformationConstants.LARGE_DIB, out propvar));
if (propvar.Type == VarEnum.VT_CF)
{
// Get CLIPDATA.
CLIPDATA clipdata = propvar.GetCLIPDATA();
// built-in Windows format
if (clipdata.ulClipFmt == -1)
{
// Pointer to BITMAPINFOHEADER.
IntPtr pBIH = clipdata.pClipData;
bitmap = DibToBitmap.Convert(pBIH);
}
else
{
Console.WriteLine("CLIP FORMAT ERROR");
Marshal.ThrowExceptionForHR(HRESULT.DV_E_CLIPFORMAT);
}
}
else
{
Console.WriteLine("INVALID VARIANT ERROR");
Marshal.ThrowExceptionForHR(HRESULT.ERROR_INVALID_VARIANT);
}
}
catch
{
throw;
}
finally
{
propvar.Clear();
}
return(bitmap);
}