[fdo-users] Shape file Extents

[Shaik Esu]

Hi All,

Here is the c#.net code to get the extents of the featureclass.

This code might help the new programmers to FDO like me.

       public IPolygon GetExtents()
        {
            IPolygon retpolygon;
            ISelectAggregates pselagree =
(ISelectAggregates)FDOConnection.CreateCommand(CommandType.CommandType_Selec
tAggregates);
 
pselagree.SetFeatureClassName(System.IO.Path.GetFileNameWithoutExtension(Ope
nedFile));
            IFeatureReader FDOReader = pselagree.Execute();
            FgfGeometryFactory GeoFac = new FgfGeometryFactory();

            Byte[] Tmppts = FDOReader.GetGeometry("Geometry");

            IGeometry Geo = GeoFac.CreateGeometryFromFgf(Tmppts);

            retpolygon = (IPolygon)Geo;

            return retpolygon;

        }


 
 

Regards,

Shaik Esu,

Sr Software Engineer,

Infotech Enterprises Ltd,

Extn: 740.

Mobile +91 9849538712.


-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org
[mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of Traian Stanev
Sent: Tuesday, October 14, 2008 9:25 AM
To: 'FDO Users Mail List'
Subject: RE: [fdo-users] Shape file Extents


Are you using the C++ API or C# or? Generally you would use a
SelectAggregates command with the SpatialExtents() function added to its
list of properties to compute. In C++, it's something like this:

    FdoPtr<FdoISelectAggregates> agg =
(FdoISelectAggregates*)con->CreateCommand(FdoCommandType_SelectAggregates);
    agg->SetFeatureClassName(L"MyFeatureClass");
    FdoPtr<FdoIdentifierCollection> props = agg->GetPropertyNames();

    FdoPtr<FdoExpression> exp =
FdoExpression::Parse(L"SpatialExtents(GEOMETRY)");
    FdoPtr<FdoComputedIdentifier> se =
FdoComputedIdentifier::Create(L"Extents", exp);
    props->Add(se);

    FdoPtr<FdoIDataReader> extrdr = agg->Execute();
    extrdr->ReadNext();

    FdoPtr<FdoByteArray> ba = extrdr->GetGeometry(L"Extents");
    //ba contains the extents polygon, in FGF array form, use FdoIGeometry
APIs to get the numbers out of it.


In C# it's similar, but I don't have a code snippet lying around.


Traian


From: fdo-users-bounces at lists.osgeo.org
[mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of Shaik Esu
Sent: Monday, October 13, 2008 11:46 PM
To: 'FDO Users Mail List'
Subject: [fdo-users] Shape file Extents

Hi all,

I am using FDO technology to work on Shape file.

I want to get the Extents (bounds) of a particular shape file. Please help
me in this regards


 Thank You,



Regards,
Shaik Esu,
Sr Software Engineer,
Infotech Enterprises Ltd,
Extn: 740.
Mobile +91 9849538712.

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