[mapguide-users] polygon zoom problem

[Kenneth Skovhede, GEOGRAF A/S]

So, the problem is that you sometimes get "Specified Object was Not Found"?
In that case your title and surrounding description is quite misleading.

Are you absolutely sure that the geometry column is named "GEOMETRY"
in all cases?

Do you check that the geometry value is not null before reading it?

Regards, Kenneth Skovhede, GEOGRAF A/S



padmini godavarthi skrev:
> Hi Kenneth,
> Thanks for ur response.
> some times i got the x,y and scale values correctly then the zoom function
> works correctly
>
>   some times i got the error at MgByteReader
>
>
>      Dim featureReader As MgFeatureReader
> =featureService.SelectFeatures(fetresource,layer.GetFeatureClassName(),
> nameQuery)              
> Dim geometryFactory As MgGeometryFactory = New MgGeometryFactory()               
>   While featureReader.ReadNext()
>
>
>
> i got the error as "Specified Object was Not Found"  in
>
>                   Dim byteReader As MgByteReader =
> featureReader.GetGeometry("GEOMETRY")
>
> can u plz tell me the solution??????????
>
> Regards,
> Padmini.
>
>
>
>
>
>   
>
>
> Kenneth Skovhede, GEOGRAF A/S wrote:
>   
>> Do you get any javascript errors?
>> Are your x,y and scale values correct in the javascript?
>>
>> Regards, Kenneth Skovhede, GEOGRAF A/S
>>
>>
>>
>> padmini godavarthi skrev:
>>     
>>>  Hi,
>>> iam using mapguide opensource 2.0 (with .net 2.0 +IIS 5.1) on win xp 
>>>
>>> i have a problem with zom toview function??????????????????
>>>
>>>  Try
>>>
>>>
>>>             If Not Session("id1") Is Nothing Then
>>>
>>>
>>>                 Dim mapCenterX As Double
>>>                 Dim mapCenterY As Double
>>>
>>>                 Dim serverVars As NameValueCollection =
>>> Request.ServerVariables
>>>                 Dim strServerVars As String = ""
>>>                 Dim str1 As String
>>>                 For Each str1 In serverVars.AllKeys
>>>                     strServerVars += "<br>" & str1
>>>                 Next
>>>                 Dim platform As String = serverVars("SERVER_SOFTWARE")
>>>                 Dim queryStr As String = serverVars("QUERY_STRING")
>>>                 Dim queryStr1 As String = serverVars("Form")
>>>                 Dim requestParams As NameValueCollection =
>>> IIf(Request.HttpMethod = "POST", Request.Form, Request.QueryString)
>>>                 Dim sessionId As String = Request.QueryString("SESSION")
>>>                 Dim realPath As String =
>>> Request.ServerVariables("APPL_PHYSICAL_PATH")
>>>                 Dim configPath As String = realPath + "webconfig.ini"
>>>                 MapGuideApi.MgInitializeWebTier(configPath)
>>>                 Dim userInfo As MgUserInformation = New
>>> MgUserInformation(sessionId)
>>>                 Dim siteConnection As MgSiteConnection = New
>>> MgSiteConnection
>>>                 siteConnection.Open(userInfo)
>>>                 Dim resService As MgResourceService =
>>> siteConnection.CreateService(MgServiceType.ResourceService)
>>>                 Dim featureService As MgFeatureService =
>>> siteConnection.CreateService(MgServiceType.FeatureService)
>>>                 Dim fetresource As MgResourceIdentifier = New
>>> MgResourceIdentifier("Library://propertytax/resource.FeatureSource")
>>>                 Dim nameQuery As MgFeatureQueryOptions = New
>>> MgFeatureQueryOptions()
>>>                 Dim val As String = "PARCEL_ID"
>>>                 nameQuery.AddFeatureProperty(val)
>>>                 Dim queryval As String = Session("id1")
>>>                 Dim totquery As String = val & "=" & "'" & queryval & "'"
>>>                 nameQuery.SetFilter(totquery)
>>>                 Dim tabname As String = "PROPERTY LAYER"
>>>                 Dim map As MgMap = New MgMap()
>>>                 map.Open(resService, "oramap")
>>>                 Dim layer As MgLayer = map.GetLayers().GetItem("PROPERTY
>>> LAYER")
>>>                 Dim geometryReaderWriter As MgAgfReaderWriter = New
>>> MgAgfReaderWriter()
>>>                 Dim featureReader As MgFeatureReader =
>>> featureService.SelectFeatures(fetresource, layer.GetFeatureClassName(),
>>> nameQuery)
>>>                 Dim geometryFactory As MgGeometryFactory = New
>>> MgGeometryFactory()
>>>                 While featureReader.ReadNext()
>>>                    Dim byteReader As MgByteReader =
>>> featureReader.GetGeometry("GEOMETRY")
>>>                    Dim geometry As MgGeometry =
>>> geometryReaderWriter.Read(byteReader)
>>>                    Dim centroid As MgPoint = geometry.GetCentroid()
>>>                   mapCenterX = centroid.GetCoordinate().GetX()
>>>                    mapCenterY = centroid.GetCoordinate().GetY()
>>>          Page.ClientScript.RegisterStartupScript(Page.GetType(), "test",
>>> "highlight(" & mapCenterX & "," & mapCenterY & ");", True)
>>>                 'End While
>>>                 featureReader.Close()
>>>                 Dim resService1 As MgResourceService =
>>> CType(siteConnection.CreateService(MgServiceType.ResourceService),
>>> MgResourceService)
>>>                 Dim featureService1 As MgFeatureService =
>>> CType(siteConnection.CreateService(MgServiceType.FeatureService),
>>> MgFeatureService)
>>>                 Dim fetresource1 As MgResourceIdentifier = New
>>> MgResourceIdentifier("Library://propertytax/resource.FeatureSource")
>>>                 Dim nameQuery1 As MgFeatureQueryOptions = New
>>> MgFeatureQueryOptions()
>>>                 Dim val1 As String = "PARCEL_ID"
>>>                 nameQuery1.AddFeatureProperty(val1)
>>>                 Dim queryval1 As String = Session("id1")
>>>                 Dim totquery1 As String = val1 + "=" + "'" + queryval1 +
>>> "'"
>>>                 nameQuery1.SetFilter(totquery1)
>>>                 Dim layer1 As MgLayer = map.GetLayers().GetItem("PROPERTY
>>> LAYER")
>>>                 Dim featureReader1 As MgFeatureReader =
>>> featureService1.SelectFeatures(fetresource1,
>>> layer1.GetFeatureClassName(),
>>> nameQuery1)
>>>                 Dim selection As MgSelection = New MgSelection(map)
>>>                 selection.AddFeatures(layer1, featureReader1, 0)
>>>                 Dim selectXML As String = selection.ToXml()
>>>                 selection.Save(resService1, "oramap")
>>>                 Page.ClientScript.RegisterStartupScript(Page.GetType(),
>>> "test", "select('" & selectXML & "')", True)
>>>                 featureReader1.Close()
>>>
>>>             End If
>>>                   
>>>          
>>>         Catch ex As Exception
>>>             'MsgBox(ex.Message)
>>>         End Try
>>>
>>> -----------------------------------------------------------------------
>>>
>>> and my java script functions are
>>>
>>>
>>> function select(val) {
>>>      
>>>          var selectionXML = val;
>>>           parent.parent.SetSelectionXML(selectionXML); 
>>>          //    parent.parent.mapFrame.ZoomToView(x,y,2000,true); 
>>>         
>>>        parent.parent.refresh;
>>>          alert("Selected");
>>>          
>>>         }
>>>         function highlight(x,y) 
>>>         {
>>>            //  alert("2nd");
>>>              
>>>            var xval = x;
>>>            var yval = y;
>>>        
>>>           parent.parent.mapFrame.ZoomToView(xval,yval,1000,true); 
>>>          
>>>         }
>>>
>>> i wrote all this code in taskpane page loading even
>>> but i didnt get the exact zoom level of that parcel it remains same as
>>> the
>>> initial view
>>>
>>> can any one plz tell me the solution????????????????????????????
>>>
>>>
>>> Regards,
>>> padmini.
>>>
>>>
>>>   
>>>       
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>>
>>
>>     
>
>   
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