ArcObjects c++ 获取栅格或矢量图层的范围

        double xLeft = 0;
	double yBottom = 0;
	double xRight = 0;
	double yUpper = 0;
	if (0 == inputType)
	{
		//获取矢量图层的范围
		CComBSTR srcPath;
		srcPath = GeoProcessHander::QString2BSTR(inputPath);
		CComBSTR srcName;
		srcName = GeoProcessHander::QString2BSTR(inputName);
		IWorkspaceFactoryPtr ipWkspFactory(CLSID_ShapefileWorkspaceFactory);
		IWorkspacePtr ipWksp;
		HRESULT hrw = ipWkspFactory->OpenFromFile(srcPath, 0, &ipWksp);
		if (FAILED(hrw) || ipWksp == 0)
		{
			return false;
		}
		IFeatureClassPtr ipSrcFeatureClass;
		hrw = ((IFeatureWorkspacePtr)ipWksp)->OpenFeatureClass(srcName,
			&ipSrcFeatureClass);
		if (FAILED(hrw) || ipSrcFeatureClass == 0)
		{
			return false;
		}

		IFeatureLayerPtr ipFeatureLayer(__uuidof(FeatureLayer));
		ipFeatureLayer->putref_FeatureClass(ipSrcFeatureClass);
		IEnvelopePtr ipEnv(CLSID_Envelope);		
		ipFeatureLayer->get_AreaOfInterest(&ipEnv);
		
		ipEnv->get_XMax(&xRight);
		ipEnv->get_YMax(&yUpper);
		ipEnv->get_XMin(&xLeft);
		ipEnv->get_YMin(&yBottom);
	}
	else if (1 == inputType)
	{
		//获取栅格数据范围		
		CComBSTR srcPath;
		srcPath = GeoProcessHander::QString2BSTR(inputPath);
		CComBSTR srcName;
		srcName = GeoProcessHander::QString2BSTR(inputName);
		IWorkspaceFactoryPtr ipWkspFactory(CLSID_RasterWorkspaceFactory);
		IWorkspacePtr ipWksp;
		HRESULT hr = ipWkspFactory->OpenFromFile(srcPath, 0, &ipWksp);
		if (FAILED(hr) || ipWksp == 0)
		{
			return false;
		}

		IRasterWorkspacePtr ipRastWork(ipWksp);
		IRasterDatasetPtr ipRastDataset;
		hr = ipRastWork->OpenRasterDataset(srcName, &ipRastDataset);
		if (FAILED(hr) || ipRastDataset == 0)
		{
			return false;
		}

		IRasterLayerPtr ipRasterLayer(__uuidof(RasterLayer));
		ipRasterLayer->CreateFromDataset(ipRastDataset);
		IEnvelopePtr ipEnv(CLSID_Envelope);
		ipRasterLayer->get_AreaOfInterest(&ipEnv);

		ipEnv->get_XMax(&xRight);
		ipEnv->get_YMax(&yUpper);
		ipEnv->get_XMin(&xLeft);
		ipEnv->get_YMin(&yBottom);
	}