Tuesday, May 2, 2017

Code snippet: To highlight selected feature in ArcMap programmatically using ArcObjects

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Code snippet to highlight selected feature in ArcMap programmatically using ArcObjects and return the STGeomFromWKB   string of selected feature.

To return the geometry you should import Microsoft.SqlServer.Types  from Nuget and SqlServerSpatial140.dll  from C:\Windows\System32

 using System;  
 using System.Collections.Generic;  
 using System.Data.SqlTypes;  
 using System.Linq;  
 using System.Runtime.InteropServices;  
 using System.Text;  
 using System.Windows;  
 using ESRI.ArcGIS.ArcMapUI;  
 using ESRI.ArcGIS.Carto;  
 using ESRI.ArcGIS.Catalog;  
 using ESRI.ArcGIS.CatalogUI;  
 using ESRI.ArcGIS.Desktop.AddIns;  
 using ESRI.ArcGIS.Display;  
 using ESRI.ArcGIS.esriSystem;  
 using ESRI.ArcGIS.Framework;  
 using ESRI.ArcGIS.Geodatabase;  
 using ESRI.ArcGIS.Geometry;  
 using Microsoft.SqlServer.Types;  
   
   
 namespace Test.Addin.ArcCommands  
 {  
   class SelectFeatureTool : ESRI.ArcGIS.Desktop.AddIns.Tool  
   {  
     protected override void OnMouseDown(MouseEventArgs arg)  
     {  
       IMxDocument mxDocument = ArcMap.Application.Document as IMxDocument;  
       IActiveView activeView = mxDocument.ActiveView;  
       IMap map = mxDocument.FocusMap;  
       ILayer layer = map.get_Layer(0); //Get 1st Layer  
       IFeatureLayer featureLayer = (IFeatureLayer) layer;  
   
       IPoint identifyPoint = activeView.ScreenDisplay.DisplayTransformation.ToMapPoint(arg.X, arg.Y);  
       ESRI.ArcGIS.Carto.IIdentify identifyLayer = (IIdentify)layer;  
       IArray array = identifyLayer.Identify(identifyPoint);  
         
       int oid = -1;  
       if (array != null)  
       {  
         object obj = array.get_Element(0);  
         IFeatureIdentifyObj fobj = obj as IFeatureIdentifyObj;  
         IRowIdentifyObject irow = fobj as IRowIdentifyObject;  
         IFeature feature = irow.Row as IFeature;  
         oid = feature.OID;  
       }  
       HighlightClickedFeature(featureLayer, oid, activeView);  
     }  
   

Friday, April 14, 2017

Code Snippet: Select feature polygon(s) on Mouse Click ArcObjects C#

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Code snippet of custom feature(s) selection tool on mouse click and highlight it using ArcObjects and C#.

 class SelectFeatureTool : ESRI.ArcGIS.Desktop.AddIns.Tool  
   {  
     protected override void OnMouseDown(MouseEventArgs arg)  
     {  
       IMxDocument mxDocument = ArcMap.Application.Document as IMxDocument;  
       IActiveView activeView = mxDocument.ActiveView;  
       IMap map = mxDocument.FocusMap;  
       ILayer layer = map.get_Layer(0); //Get 1st Layer  
       IFeatureLayer featureLayer = (IFeatureLayer) layer;  
   
       IPoint identifyPoint = activeView.ScreenDisplay.DisplayTransformation.ToMapPoint(arg.X, arg.Y);  
       ESRI.ArcGIS.Carto.IIdentify identifyLayer = (IIdentify)layer;  
       IArray array = identifyLayer.Identify(identifyPoint);  
         
       int oid = -1;  
       if (array != null)  
       {  
         object obj = array.get_Element(0);  
         IFeatureIdentifyObj fobj = obj as IFeatureIdentifyObj;  
         IRowIdentifyObject irow = fobj as IRowIdentifyObject;  
         IFeature feature = irow.Row as IFeature;  
         oid = feature.OID;  
       }  
       HighlightClickedFeature(featureLayer, oid, activeView);  
     }  
   

Wednesday, March 22, 2017

Catch Exception - Attempted to read or write protected memory in ESRI ArcObjects .Net 4.0 Framework

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First - Don't write the code to throw "Attempted to read or write protected memory" ..it is bad.

Second - If you are working on legacy codes and COM objects that throws "Attempted to read or write protected memory" while writing ArcMap add-ins, catch exceptions to prevent application crash, in my case ArcMap.


Step #1 - Add following snippet to config file - app.config for Arc-addin

<configuration>
   <runtime>
      <legacyCorruptedStateExceptionsPolicy enabled="true" />
   </runtime>
</configuration>
Step #2

Add -

[HandleProcessCorruptedStateExceptions] 
[SecurityCritical]
on the top of function you are tying catch the exception

[HandleProcessCorruptedStateExceptions]
[SecurityCritical]
public IFeatureLayer GetOrCreateFeatureLayer(string path, esriGeometryType type, ISpatialReference sr)
{
//body
}

Thursday, January 19, 2017

Code snippet : Create/update polygon attribute fields using Ogr and ESRI Arcobjects

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A code snippet example to check if a feature is standalone ESRI Shape or featureclass inside ESRI Gdb, then add new filed or update attribute value in attribute table .... standalone shape/features are created/updated using GDAL/OGR implementation and feature/featureclass stored in ESRI personal GDB are created/updated using ESRI ArcObjects.  Any solution to replace later with GDAL/Ogr is highly appreciated.  Please comment below if you find one.

 public void AddUpdateAttributeField(string oldFeatureFile)  
     {  
       DriverUtils.RegisterOgrDriver();  
       DataSource dataSource;  
       Layer layer;  
       var isShapeFile = IsShapeInGdb(oldFeatureFile);  
       if (isShapeFile)  
       {  
         dataSource = Ogr.Open(oldFeatureFile, 1); //second argument in open specifies mode of data, 1 RW & 0 readonly mode  
         layer = dataSource.GetLayerByIndex(0);  
         FieldDefn gdalFiedlDefn = new FieldDefn("FID_GDAL",FieldType.OFTInteger);  
         layer.CreateField(gdalFiedlDefn, 0);  
         Feature feature = layer.GetNextFeature();  
         while (feature!= null)  
         {  
           feature.SetField("FID_GDAL",feature.GetFID()); // Add FID shapefile  
           layer.SetFeature(feature);  
           feature = layer.GetNextFeature();  
         }  
         dataSource.FlushCache();  
       }  
       else  
       {  
         try  
         {  
           EnableEsriLiscences();  
           string gdbPath = Path.GetDirectoryName(oldFeatureFile);  
           string featureName = Path.GetFileNameWithoutExtension(oldFeatureFile);  
           IWorkspaceFactory workspaceFactory = new FileGDBWorkspaceFactory();  
           IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspaceFactory.OpenFromFile(gdbPath, 1);  
           IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(featureName);  
           IFields fields = featureClass.Fields;  
           if (fields.FindField("FID_GDAL") == -1)  
           {  
             // Create a Int field called "FID_GDAL" for the fields collection

Thursday, October 8, 2015

Clip a raster from feature shape file using C# and ArcObject's geoprocessor

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Code snippet in clipping a raster from feature shape file using C# and ArcObject's geoprocessor -

 public static void ClipRaster(string inRaster, string inClipFeature, string outTempRaster)  
     {  
       Clip clipTool = new Clip();  
   
       //set clip parameters  
       clipTool.in_raster = inRaster;  
       clipTool.out_raster = outTempRaster;  
   
       //clip extent  
       clipTool.in_template_dataset = inClipFeature;  
   
       Geoprocessor gp = new Geoprocessor();  
       gp.OverwriteOutput = true;  
       gp.AddOutputsToMap = false;  
         
       try  
       {  
         IGeoProcessorResult result = (IGeoProcessorResult)gp.ExecuteAsync(clipTool);  
         while(result.Status != esriJobStatus.esriJobSucceeded)  
         {  
           //Console.WriteLine(result.Status.ToString());  
           System.Threading.Thread.Sleep(100);  
         }  
       }  
       catch (Exception ex)  
       {  
         object level = 0;  
         Console.WriteLine(gp.GetMessages(ref level));  
         Console.WriteLine(" Failed to clip raster using ESRI clip tool " + ex.Message);  
       }  
   
     }  

Thursday, September 24, 2015

Calculate zonal-statistics using ESRI ArcObjects and C#

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Import the following references in the project.

using ESRI.ArcGIS.Geoprocessor;
using ESRI.ArcGIS.SpatialAnalystTools;
using ESRI.ArcGIS.esriSystem;

This solution is only works for single band raster. For multi-band raster zonal statistics I will make a separate post soon.

 public static void ComputeZonalStatisticsFromEsri(string feature, string zoneField, string valueRaster, string outputTable)  
     {  
   
       ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.Desktop);  
       ESRI.ArcGIS.RuntimeManager.BindLicense(ESRI.ArcGIS.ProductCode.Desktop);  
   
       UID pUid = new UIDClass();  
       pUid.Value = "esriSpatialAnalystUI.SAExtension";  
   
       // Add Spatial Analyst extension to the license manager.  
       object v = null;  
       IExtensionManagerAdmin extensionManagerAdmin = new ExtensionManagerClass();  
       extensionManagerAdmin.AddExtension(pUid, ref v);  
   
       // Enable the license.  
       IExtensionManager extensionManager = (IExtensionManager)extensionManagerAdmin;  
       IExtension extension = extensionManager.FindExtension(pUid);  
       IExtensionConfig extensionConfig = (IExtensionConfig)extension;   
   

Wednesday, September 16, 2015

Feature to Raster Conversion Using C# and ArcGIS

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Import ArcGIS.ConversionTools and ArcGIS.Geoprocessor then pass the file paths as param into following function you will get the resulting raster out of shapefile.

 using ESRI.ArcGIS.ConversionTools;  
 using ESRI.ArcGIS.Geoprocessor;  
   
 public static void Rasterize(string inputFeature, string outRaster, string fieldName, int cellSize)  
     {      
         //Runtime manager to find the ESRI product installed in the system  
         ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.Desktop);  
   
         Geoprocessor geoprocessor = new Geoprocessor();  
         geoprocessor.OverwriteOutput = true;  
   
         FeatureToRaster featureToRaster = new FeatureToRaster();  
         featureToRaster.cell_size = cellSize;  
         featureToRaster.in_features = inputFeature;  
         featureToRaster.out_raster = outRaster;  
         featureToRaster.field = fieldName;  
   
         geoprocessor.Execute(featureToRaster, null);  
     }  

Tuesday, March 10, 2015

Draw features in ArcMap using ArcGIS Addin tool (Arcobject's IRubberband Interface)

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 protected override void OnMouseDown(ESRI.ArcGIS.Desktop.AddIns.Tool.MouseEventArgs arg)  
 {  
      //create geometery  
      if (ArcMap.Document != null)  
      {  
           IScreenDisplay screenDisplay = ArcMap.Document.ActiveView.ScreenDisplay;  
           // Constants  
           screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)esriScreenCache.esriNoScreenCache);  
           // Explicit Cast  
           IRgbColor rgbColor = new RgbColorClass();  
           rgbColor.Red = 255;  
           rgbColor.Transparency = 75;  
           IColor color = rgbColor; // Implicit Cast  
           ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();  
           simpleFillSymbol.Color = color;  
           //Draw geometry  
           ISymbol symbol = simpleFillSymbol as ISymbol; // Dynamic Cast  
           IRubberBand rubberBand = new RubberPolygonClass();  
           IGeometry geometry = rubberBand.TrackNew(screenDisplay, symbol);  
           //check for valid geometery  
           if (geometry != null)  
           {  
                screenDisplay.SetSymbol(symbol);  
                screenDisplay.DrawPolygon(geometry);  
                screenDisplay.FinishDrawing();  
                //Open addattributes wpf form  
                AddAtrributesView addAtrributesView = new AddAtrributesView(geometry);  
                addAtrributesView.ShowInTaskbar = false;  
                addAtrributesView.ShowDialog();  
                ArcMap.Document.ActivatedView.Refresh();  
           }  
      }       
 }  

Monday, February 2, 2015

Getting into ESRI ArcGIS Add-in Development in .Net and ArcObjects

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Recently, I landed into a project for ArcGIS/ArcMap Desktop add-in development using ArcObjects in C#. I am a newbie in both ArcObjects and add-in development. Googling through I got tons of snippets on the ArcMap add-in development, but I was not familiar with tailoring them to make a working application.

Then, I started to look after Youtube and Amazon to see if any good basic books or tutorials that gives me basic concepts on tailoring the  ArcObjects/.Net snippets. On youtube, I came across a video tutorials series on “.Net programming with ArcOjects”, an excellent tutorial on ArcObjects and .Net development with sample Gis data and codes to download  by Hussein Nasser. I watched all 15 episodes on add-in development using VB.Net.

From the Amazon, I bought a book entitled, “Beginning ArcGIS for Desktop Development using .NET ” by Pouria Amirian, with a blind believe on the reviewers, but it turned out the 
The book is wonderful! The author does an excellent job of explaining basic .NET concepts and tying them into ArcObjects.This book was long overdue and it seems like the author really took his time to ensure the content was organized in a logical way and concepts are thoroughly explained.

I would recommend this book and Youtube video to anyone who is interested in learning ArcObjects in .NET. The both author includes .NET code samples as well as the solutions in C#/VB. Lots of useful stuff in there and I think when you finished you will have a good starting point to ArcGIS Desktop development.

Friday, January 23, 2015

Parenting Win-form and WPF form in ArcMap

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Parenting of Win-form windows and WPF windows within a ArcMap application using C#.Net code snippets-

Step 1: Create a ArcMapWrapper.cs, wrapper class

        using System;
        using System.Windows.Forms;
        using ESRI.ArcGIS.Framework;

        namespace ArcMapClassLibrary2
        {
               class ArcMapWrapper:IWin32Window
               {
                    private IApplication _arcMapApplication;

                    public ArcMapWrapper( IApplication mApplication)
                    {
                       _arcMapApplication = mApplication;
                    }

                    public IntPtr Handle
                    {
                       get { return new IntPtr(_arcMapApplication.hWnd); }
           
                     }
                 }
           }

Step 2: Access from Win-form

              WinForm fm = new WinForm();                        
              ArcMapWrapper wrapper= new ArcMapWrapper(map_application);  
              fm.ShowInTaskbar = false;        
              fm.Show(wrapper);

              //Try, it behaves like a modal dialog
              //fm.ShowDialog()

Tuesday, January 13, 2015

Create standalone feature class and feature class inside feature dataset on Geodatabase using ArcObjects

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 public void StartUp()   
    {   
     try   
     {   
       //create gdb   
      const string path = "D:/SampleDatasets/NewShp";   
      const string fileGDBName = "sample.gdb";   
      const string fileGDBAddress = path + "/" + fileGDBName;   
      const string featureDatasetname="polygonFeatureClasses";   
      const string featureClassname = "MytestPolygons";   
      if (System.IO.Directory.Exists(fileGDBAddress))   
      {   
       Console.WriteLine("already exist");   
       // return;   
      }   
      Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBWorkspaceFactory");   
      IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance(factoryType);   
      IWorkspaceName workspaceName = workspaceFactory.Create(path, fileGDBName, null,ArcMap.Application.hWnd);   
      MessageBox.Show("gbd created!");   
      
      //Create feature dataset   
      IFeatureWorkspace fws = workspaceFactory.OpenFromFile(fileGDBAddress, ArcMap.Application.hWnd) as IFeatureWorkspace;   
      
     //check the existance of FeatureDataset   
      IWorkspace2 ws = fws as IWorkspace2;   
      if(ws.get_NameExists(esriDatasetType.esriDTFeatureDataset,featureDatasetname)==true)   
      {   
       MessageBox.Show("Feature dataset is already exists");   
      }  

      #region feature Class inside feature Dataset : Region_1 (Choose either Region_1 or Region_2)  
     
      //Create a spatial refrence/extract spatial refrence from map   
      //Infuture will access through the arcmap   
      ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();   
      int coordinateSystemID = (int) esriSRGeoCSType.esriSRGeoCS_WGS1984;   
      ISpatialReference spatialReference =spatialReferenceFactory.CreateGeographicCoordinateSystem(coordinateSystemID);   
      

Wednesday, January 9, 2013

GIS Programming for GIS Analyst using Python

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Penn state has a nice collection of ArcGIS & Python programming step by step guide for their GEOG 485 students, which is also available for non-students via Penn state website.  This course’s is main aim is to make student able to use the Python scripting language to automate GIS tasks in ArcMap, assemble ArcView geoprocessing tools into models to solve GIS problems, and run the tools from scripts to automate GIS tasks. 

Although no previous programming experience is assumed, the course's target is to make a student as a GIS programmer/analyst in ArcGIS and Python environment. 

The course is basically divided into four parts:

Tuesday, March 13, 2012

Solved: AutomationException 0x80004005 - Unspecified error

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I was writing ArcGIS extension for Geoprocessing using JAVA and ArcObjects 10. My need was to process about 1000 PRISM raster datasets globally to compute various environments.

My application did work up to 45- 50 raster files without any problems in loop, then if fails with “AutomationException 0x80004005 - Unspecified error”. If I restarted the application again works for next 45-50 raster files and then crashes with the same error.

I still couldn’t figure out what was the exact cause for application failure-my guess is it may be due to memory management/garbage collection problem among ArcGIS COM objects and JAVA objects.
Fortunately, I solved this issue by reinitializing ArcGIS engine (hope re-initialization breaks the locks and flushes the garbage) after 20 raster files processing. Now, the application works well without any breaks but little bit slower while initializing the ArcGIS engine after 20 raster files processing.
 

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