void CWzjAoRasterOp::RasterToPolygonShp(CString szRasPath, CString szPath, CString szFileName, CString szFieldName)
{
 IRasterLayerPtr ipRLayer(CLSID_RasterLayer);
 ipRLayer->CreateFromFilePath(CComBSTR(szRasPath));
 IRasterPtr ipRaster;
 ipRLayer->get_Raster(&ipRaster);

 IRasterDescriptorPtr ipRDescr(CLSID_RasterDescriptor);
 ipRDescr->Create(ipRaster, NULL, CComBSTR(szFieldName));
 
 IConversionOpPtr ipConversionOp(CLSID_RasterConversionOp);
 IWorkspacePtr ipWS;
 IWorkspaceFactoryPtr ipWSF(CLSID_ShapefileWorkspaceFactory);
 ipWSF->OpenFromFile(CComBSTR(szPath), 0, &ipWS);
 
 IFeatureClassPtr ipOutFClass;  
 ipConversionOp->RasterDataToPolygonFeatureData((IGeoDatasetPtr)ipRDescr, ipWS, CComBSTR(szFileName), TRUE, &(IGeoDatasetPtr)ipOutFClass);
}