How to create a simple python add-in tool for ArcGIS Desktop

How to create a simple python add-in for ArcGIS Desktop

TOOL USED:  Python Add-in Assistant

WORKING OF THE TOOL:

Creating a Simple python add-in assistant for ArcGIS Desktop to add a Fishnet table to the ArcMap using the python

Type of Python Add-in: Tool Type

Function: At the end of drawing a rectangle on the ArcMap a fishnet with specified rows and columns should appear on the Screen

A python add-in tool is very similar to a button. But, a tool requires user to interact with the map application based on that interaction some business logic will get executed. The Zoom In tool  in ArcMap will be a great example, when the user draws a rectangle on the ArcMap ,then the map will be redrawn with that rectangle as an extent.

Below steps will help you to create both Toolbox as well as a Tool on it

PROCEDURE:

Steps to Create a Toolbar for your Tool:

1.     To create your own toolbar. Open the Add-n assistant and Go to Add-in Contents tab and give the information about the add-in which you are going to create.
Note: A tool can reside on a Toolbar but cannot sits on a Menu

2.     Click the Add-In Contents tab and begin declaring your add-in customizations. A tool can reside on a toolbar but not on a menu. See creating an add-in toolbar for more detailed procedure.

3.     To Create the tool on your new Toolbar

Right-click the new toolbar and choose New Tool on the right click Menu.

Python addin assistant window

At once you have finished giving out the information and details about the add-in. Click on Save button at the bottom of the wizard. All the necessary files and folders will get created within the working folder of your add-in assistant.

Now it is the time to work on the main code. Go to the python script located on the install folder and open it using your Python idle. Code will appear as shown below with the class name same as your button name.
Note: Do not change the button name as it is directly linked with the button and registered in the your Config.xml file

 

Onclick() methof of the addin button class

The Onclick () method shown on idle will get executed on when the user click on the tool . But I our case the fishnet should get created whenever the user draw the tool is selected and draw an rectangle on the Map. So to do that OnRectangle () method of the python add-in will comes in to Picture. Replace on click method with OnRectangle () method as shown below:

Fishnet content added to On Rectangle method

·         The code will check for any preexistence of fishnet on the memory using the Exist() Method and deletes if anyone is already there using the Delete_Management() function.

·         CreateFishnet_management is the core function which is going to do the actual work after supply all the necessary parameters to it

·         Refresh the active view to redraw the Map and return the path of the fishnet to the calling function.

How to check for condition in Geoprocessing Service or Model Builder

How to check for if/else conditions in Geoprocessing Service

TOOL USED:  

Arc python and Script tool

Python script will be deployed in the ARC Toolbox to create the Conversion Tool 

WORKING OF THE TOOL:

Script tool is created in the ArcMap and the required input & Output Parameter are set. The script tool source is set to the custom python code present in an Python file(.py)

Out motive is to use check for the count of a features in an feature class and performing an conditional Execution

PROCEDURE:

• Open ArcMap 10.0+ 
• Create your own Geometric Network or Open your Existing Geometric Network
• Add your Geometric network to the Table of contents in the ArcMap as Shown Below

·         Create a new Model in your myToolBox .Right Click on MyToolBox > New > Model.Following window will appear on the Screen 

•    Add your desired feature class to the Model. (Right Click on any empty space and select ADD DATA  and select your feature class in the object browser)
• ·         Add Get Count and Calculate value Model from the System Toolbox Connect the model as shown below 

• ·         Now open calculate value Model and in the Expression Textbox call the function Calculate(%RowCount%)
• ·         Here %RowCount% will act as an Inline Variable and Compiler automatically replace the %RowCount% with the value of the rowcount field
• ·         At the Code block defined the function Calculate as

def calculate(row):

if row>0:

return true

else:

return false

• ·         Make the return Data type as Boolean
• ·         The output Boolean can be set as a precondition for any model. So that the Model  get executes only when the output of calculate value is true

Performance issues on ArcGIS Geoprocessing Service

How to improve Geo-processing Execution Speed

Geoprocessing services hosted in the ArcGIS server needs to be pretty fast and accurate. User will always want the service to be the fastest. Since ArcGIS Server will be able to service multiple users at one instant of time, inefficient services can overload your server and increase the processing time. The more efficient and intelligent your services, the more users can be serviced with the same computing resources at a smaller amount of time.

Below are some of the tips and techniques that helps in increasing the performance of your Geo-processing Services.

Use local paths to data and resources

The more faster the data requires to be processed is accessible by the server the more faster your service will be.It is good to copy your data to the server rather than placing it on the shared location and asking the server to access it.(Copying the server will be effective only if the Geo processing input data is very small in size and also when the input data is not dynamic)

Reading data from the local area network will be slow compared to accessing the data from the local disk.. 

Reading and Writing the Intermediate data IN_Memory

The service execution speed will get increased by multiple times when the intermediate data is allowed to stored in the machine memory(RAM).Input and output operation is the slowest of all the computing operations.In Geoprocessing storing the intermediate data in a file geodatabase or personnel Geodatabase will take maximum of the execution time.

Please be sure the data which your are storing in the memory as an intermediate data need not be necessary after the execution is complete.Because once the execution is complete the data in the memory will get cleared.Don't write large amount of data to the in_memory as it may affect the performance of the processing service.

To write to your computer's memory, use the pathname in_memory, as follows:

          in_memory\your featureclassname

Use layers from a source map document

If a service uses a source map document instead of feature classes and datasets, it will tremendously increase the performance of the service.Your models and scripts can use map layers from the source map document so that it will impose less load on the processor and significantly decrease the execution time. A layer references a dataset on disk or feature class on a geodatabase, and some layers cache properties about the dataset. Therefore by using dataset layer instead of the direct dsataset or feature class,there is a performance advantage because ArcMap opens the dataset once, caches basic properties of the dataset, and keeps the dataset open. When the Service executes, the dataset need not to be  reopened because the source map document already it is opened and it will gives us a performance boost.

Write data to shapefiles

Storing the data to shapefiles is a bit faster than writing to other formats but writing data to memory, described above, is the fastest of all. Even then there is further more limitations on the shapefiles such field names should be  as 10 character , no null values, and limited support for date/time, to name a few. This become more helpful if the you are running your model locally on your Desktop

ArcObjects to add a flag to the Geometric Network .Net

Creating a Flag in ArcMap using ArcObjects .NET

1. Add a new add-in component to the CreatingOutputs solution and name the component

AddFlagTool. Select Tool as the type of add-in, set the confi guration of the tool as shown in

2. Enter the following using directives at the top of the AddFlagTool.cs fi le’s code window:

using ESRI.ArcGIS.ArcMapUI;

using ESRI.ArcGIS.Geometry;

using ESRI.ArcGIS.Display;

using ESRI.ArcGIS.Carto;

3. You are going to write the code for handling the OnMouseDown event. In other words, you want

your code to be executed when a user clicks somewhere in the main window of the software application. Because all the events and their handlers are defined in the base class of all tools(ESRI.ArcGIS.Desktop.AddIns.Tool), you have to override the necessary handlers. So write

the following code in the AddflagTool.cs file inside the definition for the AddflagTool class and outside of any method: protected override

As soon as you type these two keywords and press the spacebar, you will see the list of all available handlers.

Find OnMouseDown in the list as shown in  below Figure and press Enter.

4.On the Mouse down event call the add flag function in the another library

5.For the Add flag function add the following code in the other library addflag function

        public static void AddFlag(IPoint pPnt, IApplication app, double snapTol)

        {

            //IProgressDialogFactory pProDFact = null;

            //IStepProgressor pStepPro = null;

            //IProgressDialog2 pProDlg = null;

            //ITrackCancel pTrkCan = null;

            IGeometricNetwork gn = null;

            IPoint snappedPoint = null;

            IFlagDisplay pFlagDisplay = null;

            INetFlag startNetFlag = null;

            INetworkAnalysisExt pNetAnalysisExt = null;

            IMap pMap = null;

            UID pID = null;

            int EID = -1;

            try

            {

                pID = new UID();

                pID.Value = "esriEditorExt.UtilityNetworkAnalysisExt";

                pNetAnalysisExt = (INetworkAnalysisExt)app.FindExtensionByCLSID(pID);

                gn = pNetAnalysisExt.CurrentNetwork;

                pMap = (app.Document as IMxDocument).FocusMap;

                startNetFlag = Globals.GetJunctionFlagWithGN(ref pPnt, ref pMap, ref gn, snapTol,out snappedPoint, out EID, out  pFlagDisplay, true) as INetFlag;

                if (startNetFlag == null)

                {

                    //startNetFlag = Globals.GetEdgeFlag(ref pPnt, ref pMap, ref gnList, snapTol, ref gnIdx, out snappedPoint, out EID, out distanceAlong, out  pFlagDisplay, true) as INetFlag;

                }

                if (app != null)

                {

                    

                    Globals.AddFlagToGN(ref pNetAnalysisExt, ref  gn, ref pFlagDisplay);

                    //  pFlagDisplay

                    pNetAnalysisExt = null;

                    pID = null;

                }

            }

            catch (Exception)

            {

                

                throw;

            }

        }

5. The above function will make a call to the getJunctionflag code.create a function block called "getjunctionflag" with the class library Global  and place the below code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using ESRI.ArcGIS.SystemUI;

using ESRI.ArcGIS.Geometry;

using ESRI.ArcGIS.GeoDatabaseUI;

using ESRI.ArcGIS.Geodatabase;

using ESRI.ArcGIS.Framework;

using ESRI.ArcGIS.esriSystem;

using ESRI.ArcGIS.Display;

using ESRI.ArcGIS.DataSourcesGDB;

using ESRI.ArcGIS.DataSourcesFile;

using ESRI.ArcGIS.CartoUI;

using ESRI.ArcGIS.Carto;

using ESRI.ArcGIS.ArcMapUI;

using ESRI.ArcGIS.ArcMap;

using ESRI.ArcGIS.NetworkAnalysis;

using ESRI.ArcGIS.NetworkAnalyst;

using ESRI.ArcGIS.EditorExt;

namespace Toolkit

{

    class Globals

    {

        public enum GNTypes

        {

            Flags = 1, Barries = 2, Results = 3

        };

        public enum flagType { EdgeFlag, JunctionFlag, EdgeBarrier, JunctionBarrier };

    

        public static IJunctionFlag GetJunctionFlagWithGN(ref IPoint point, ref IMap map, ref IGeometricNetwork gn, double snapTol, out IPoint snappedPoint, out int EID, out  IFlagDisplay pFlagDisplay, bool Flag)

        {

            //Initialize output variables

            snappedPoint = null;

            EID = -1;

            pFlagDisplay = null;

            int FCID = -1, FID = -1, subID = -1;

            IGeoDataset pDS = null;

            IPointToEID pointToEID = null;

            INetElements netElements = null;

            INetFlag junctionFlag = null;

            try

            {

                pFlagDisplay = null;

                pDS = gn.FeatureDataset as IGeoDataset;

                point.Project(pDS.SpatialReference);

                pointToEID = new PointToEIDClass() as IPointToEID;

                // find the nearest junction element to this Point

                pointToEID.GeometricNetwork = gn as IGeometricNetwork;

                pointToEID.SourceMap = map;

                pointToEID.SnapTolerance = snapTol;

                try

                {

                    pointToEID.GetNearestJunction(point, out EID, out snappedPoint);

                }

                catch (Exception ex)

                {

                }

                if (snappedPoint == null)

                    return null;

                // convert the EID to a feature class ID, feature ID, and sub ID

                netElements = gn.Network as INetElements;

                try

                {

                    netElements.QueryIDs(EID, esriElementType.esriETJunction, out FCID, out FID, out subID);

                }

                catch (Exception ex)

                {

                    return null;

                }

                //Create flag for start of trace

                junctionFlag = new JunctionFlagClass() as INetFlag;

                junctionFlag.UserClassID = FCID;

                junctionFlag.UserID = FID;

                junctionFlag.UserSubID = subID;

                if (junctionFlag is IEdgeFlag)

                {

                    pFlagDisplay = new EdgeFlagDisplayClass();

                    if (Flag)

                        pFlagDisplay.Symbol = CreateNetworkFlagBarrierSymbol(flagType.EdgeFlag) as ISymbol;

                    else

                        pFlagDisplay.Symbol = CreateNetworkFlagBarrierSymbol(flagType.EdgeBarrier) as ISymbol;

                }

                else

                {

                    pFlagDisplay = new JunctionFlagDisplayClass();

                    if (Flag)

                        pFlagDisplay.Symbol = CreateNetworkFlagBarrierSymbol(flagType.JunctionFlag) as ISymbol;

                    else

                        pFlagDisplay.Symbol = CreateNetworkFlagBarrierSymbol(flagType.JunctionBarrier) as ISymbol;

                }

                pFlagDisplay.ClientClassID = FCID;

                pFlagDisplay.FeatureClassID = FID;

                pFlagDisplay.SubID = subID;

                pFlagDisplay.Geometry = snappedPoint;

                return junctionFlag as IJunctionFlag;

            }

            catch

            {

                return null;

            }

            finally

            {

                pDS = null;

                pointToEID = null;

                netElements = null;

            }

        }

        public static ISimpleMarkerSymbol CreateNetworkFlagBarrierSymbol(flagType flgType)

        {

            ISimpleMarkerSymbol pSymbolFlag = null;

            switch (flgType)

            {

                case flagType.EdgeFlag:

                    pSymbolFlag = new SimpleMarkerSymbolClass();

                    pSymbolFlag.Style = esriSimpleMarkerStyle.esriSMSSquare;

                    pSymbolFlag.Angle = 0;

                    //pSymbolFlag.Color = 

                    pSymbolFlag.Outline = true;

                    pSymbolFlag.OutlineSize = 1;

                    //pSymbolFlag.OutlineColor = GetColor(0, 0, 0);

                    pSymbolFlag.Size = 10; //TODO: UserConfig

                    break;

                case flagType.JunctionFlag:

                    pSymbolFlag = new SimpleMarkerSymbolClass();

                    pSymbolFlag.Style = esriSimpleMarkerStyle.esriSMSCircle;

                    pSymbolFlag.Angle = 0;

                    //pSymbolFlag.Color = GetColor(0, 255, 0);

                    pSymbolFlag.Outline = true;

                    pSymbolFlag.OutlineSize = 1;

                    //pSymbolFlag.OutlineColor = GetColor(0, 0, 0);

                    pSymbolFlag.Size = 10; //TODO: UserConfig

                    break;

                case flagType.EdgeBarrier:

                    pSymbolFlag = new SimpleMarkerSymbolClass();

                    pSymbolFlag.Style = esriSimpleMarkerStyle.esriSMSDiamond;

                    pSymbolFlag.Angle = 0;

                    //pSymbolFlag.Color = GetColor(255, 0, 0);

                    pSymbolFlag.Outline = true;

                    pSymbolFlag.OutlineSize = 1;

                    //pSymbolFlag.OutlineColor = GetColor(0, 0, 0);

                    pSymbolFlag.Size = 10; //TODO: UserConfig

                    break;

                case flagType.JunctionBarrier:

                    pSymbolFlag = new SimpleMarkerSymbolClass();

                    pSymbolFlag.Style = esriSimpleMarkerStyle.esriSMSX;

                    pSymbolFlag.Angle = 0;

                    //pSymbolFlag.Color = GetColor(255, 0, 0);

                    pSymbolFlag.Outline = true;

                    pSymbolFlag.OutlineSize = 1;

                    //pSymbolFlag.OutlineColor = GetColor(0, 0, 0);

                    pSymbolFlag.Size = 10; //TODO: UserConfig

                    break;

                default:

                    pSymbolFlag = new SimpleMarkerSymbolClass();

                    pSymbolFlag.Style = esriSimpleMarkerStyle.esriSMSCircle;

                    pSymbolFlag.Angle = 0;

                    //pSymbolFlag.Color = GetColor(0, 255, 0);

                    pSymbolFlag.Outline = true;

                    pSymbolFlag.OutlineSize = 1;

                    //pSymbolFlag.OutlineColor = GetColor(0, 0, 0);

                    pSymbolFlag.Size = 10; //TODO: UserConfig

                    break;

            }

            return pSymbolFlag;

        }

        public static void AddFlagToGN(ref INetworkAnalysisExt pNetworkAnalysisExt, ref ESRI.ArcGIS.Geodatabase.IGeometricNetwork pGeomNet, ref  IFlagDisplay pFlagDsiplay)

        {

            INetworkAnalysisExtFlags pNetworkAnalysisExtFlags = null;

            try

            {

                if (pNetworkAnalysisExt.CurrentNetwork != pGeomNet)

                {

                    pNetworkAnalysisExt.CurrentNetwork = pGeomNet;

                }

                pNetworkAnalysisExtFlags = (INetworkAnalysisExtFlags)pNetworkAnalysisExt;

                if (pFlagDsiplay is IEdgeFlagDisplay)

                {

                    pNetworkAnalysisExtFlags.AddEdgeFlag(pFlagDsiplay as IEdgeFlagDisplay);

                }

                else

                {

                    pNetworkAnalysisExtFlags.AddJunctionFlag(pFlagDsiplay as IJunctionFlagDisplay);

                }

            }

            catch

            {

            }

            finally

            {

                pNetworkAnalysisExtFlags = null;

            }

        }

    }

}

6. Run code and set the default debug application as ArcMap

7. Once the ArcMap is open go to customise code and in the command tab add the tool to your window

8.click on the tool will add an flag symbol to the map(use f5 to refresh the map)

Addin Setting flow direction in Geometric Network

Addin source code for setup flow direction   

1.Create an c# object with establish flow as a function

2.Call this function from the addin on click method by passing the application reference and the type of flow direction you wish to set to your network

To know more about geometric network setting flow direction setting flow direction

Setting Flow Direction through ArcObjects Code

public static void EstablishFlow(Globals.GNFlowDirection flowDirection, IApplication app)
        {
            IProgressDialog2 progressDialogs= default(IProgressDialog2);
            IProgressDialogFactory progressDialogFactorys = null;
            IEditor editing = null;
         
            IMouseCursor appCursor = null;
            INetworkAnalysisExt netExt = null;
            UID pUID = null;
         
            List<IGeometricNetwork> geonetworklist= null;
            ITrackCancel trackCancel = null;
            Int32 int32_hWnd;
            IStepProgressor stepProgressorobj= null;
            IMxDocument mxdoc = null;
   IEditLayers eLayers = null;
   IMap pMap = null;
            try
            {




                int calcCount = 0;

                //Get editing

                editing = Globals.geteditor(ref app);

                if (editing.EditState != esriEditState.esriStateEditing)
                {
                    MessageBox.Show(Teamgeofunctions.Localizer.GetString("MustBEditg"), Teamgeofunctions.Localizer.GetString("GeoNetToolsLbl_2"));
                    return;
                }

                eLayers = editing as IEditLayers;

                //Change mouse cursor to wait - automatically changes back (ArcGIS Desktop only)
                appCursor = new MouseCursorClass();
                appCursor.SetCursor(2);

                ESRI.ArcGIS.esriSystem.IStatusBar statusBar = app.StatusBar;
                statusBar.set_Message(0, Teamgeofunctions.Localizer.GetString("GeoNetToolsWait_1"));

                //Get NA Extension in order to update the current network with the first visible network
                pUID = new UIDClass();
                pUID.Value = "esriEditorExt.UtilityNetworkAnalysisExt";
                netExt = app.FindExtensionByCLSID(pUID) as INetworkAnalysisExt;

                //Get Visible geometric networks
                pMap = editing.Map;
                geonetworklist= Globals.GetGeometricNetworksCurrentlyVisible(ref pMap);


                if (gnList.Count > 0)
                {


                    //ProgressBar
                    progressDialogFactorys= new ProgressDialogFactoryClass();

                    // Create a CancelTracker
                    trackCancel = new CancelTrackerClass();

                    // Set the properties of the Step Progressor
                    int32_hWnd = app.hWnd;
                    stepProgressorobj= progressDialogFactory.Create(trackCancel, int32_hWnd);
                    stepProgressor.MinRange = 0;
                    stepProgressor.MaxRange = gnList.Count;
                    stepProgressor.StepValue = 1;
                    stepProgressor.Message = "";
                    stepProgressor.Hide();

                    // Create the ProgressDialog. This automatically displays the dialog
                    progressDialogs= (ESRI.ArcGIS.Framework.IProgressDialog2)stepProgressor; // Explict Cast

                    // Set the properties of the ProgressDialog
                    progressDialog.CancelEnabled = false;
                    progressDialog.Description = Teamgeofunctions.Localizer.GetString("GeoNetToolsDesc_1");
                    progressDialog.Title = Teamgeofunctions.Localizer.GetString("GeoNetToolsTitle_1");
                    progressDialog.Animation = ESRI.ArcGIS.Framework.esriProgressAnimationTypes.esriProgressSpiral;

                    bool editStarted = false;
                    try
                    {// Create an edit operation enabling undo/redo
                        editing.StartOperation();
                        editStarted = true;
                    }
                    catch
                    {
                        editStarted = false;
                    }
                    IGeometricNetwork gn = null;
                    IEnumFeatureClass enumFC = null;
                    INetwork net = null;
                    IUtilityNetworkGEN unet = null;
                    IEnumNetEID edgeEIDs = null;
                    //IFeatureLayer fLayer = null;
                    try
                    {

                        for (int i = 0; i < gnList.Count; i++)
                        {

                            gn = gnList[i] as IGeometricNetwork;
                         
                            stepProgressor.Message = Teamgeofunctions.Localizer.GetString("GeoNetToolsProc_1");// +fLayer.Name;
                            //Establish flow using AncillaryRole values


                            if (flowDirection == Globals.GNFlowDirection.AncillaryRole)
                            {
                                enumFC = gn.get_ClassesByNetworkAncillaryRole(esriNetworkClassAncillaryRole.esriNCARSourceSink);
                                if (enumFC.Next() == null)
                                    MessageBox.Show(Teamgeofunctions.Localizer.GetString("GeoNetToolsError_1a") + gn.FeatureDataset.Name + Teamgeofunctions.Localizer.GetString("GeoNetToolsError_1b") + Environment.NewLine +
                                                    Teamgeofunctions.Localizer.GetString("GeoNetToolsError_1c"), Teamgeofunctions.Localizer.GetString("GeoNetToolsProc_2"));
                                else
                                {
                                    gn.EstablishFlowDirection();
                                    calcCount += 1;
                                }
                            }

                            //Establish flow direction based on digitized direction.
                            else
                            {
                                net = gn.Network;
                                unet = net as IUtilityNetworkGEN;
                                edgeEIDs = net.CreateNetBrowser(esriElementType.esriETEdge);
                                edgeEIDs.Reset(); int edgeEID;
                                for (long j = 0; j < edgeEIDs.Count; j++)
                                {
                                    edgeEID = edgeEIDs.Next();
                                    unet.SetFlowDirection(edgeEID, esriFlowDirection.esriFDWithFlow);
                                }
                                calcCount += 1;
                            }
                            stepProgressor.Step();

                        }
                    }

                    catch (Exception ex)
                    {
                        editing.AbortOperation();
                        MessageBox.Show(Teamgeofunctions.Localizer.GetString("GeoNetToolsProc_2") + "\n" + ex.Message, ex.Source);
                    }
                    finally
                    {
                        if (enumFC != null)
                            Marshal.ReleaseComObject(enumFC);

                        gn = null;
                        enumFC = null;
                        net = null;
                        unet = null;
                        edgeEIDs = null;
                        //fLayer = null;
                    }
                    if (editStarted)
                    {   // Stop the edit operation
                        if (flowDirection == Globals.GNFlowDirection.AncillaryRole)
                            editing.StopOperation(Teamgeofunctions.Localizer.GetString("GeoNetToolsProc_2"));
                        else
                            editing.StopOperation(Teamgeofunctions.Localizer.GetString("GeoNetToolsProc_3"));
                    }
                    object Missing = Type.Missing;
                    mxdoc = app.Document as IMxDocument;
                    mxdoc.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, Missing, mxdoc.ActiveView.Extent);

           
            }
            catch (Exception ex)
            {
       
                return;


            }
            finally
            {
                // delete the references to cleanup the memory
                if (progressDialogs!= null)
                    progressDialog.HideDialog();
                progressDialogs= null;
                progressDialogFactorys= null;
                editing = null;
                eLayers = null;
                appCursor = null;
                netExt = null;
                pUID = null;
                pMap = null;
                geonetworklist= null;
                trackCancel = null;

                stepProgressorobj= null;
                mxdoc = null;
            }

Custom Geoprocessing Tool

Arcobjects Geoprocessing Procedure:

1. Create a geoprocessor object and set its properties.
2. Set the appropriate values for the tool’s parameters.
3. Execute a tool using the geoprocessor object’s Execute() method.

In order to create a geoprocessor object, the IGeoProcessor2 interface can be used. This interface
is defined in the geoprocessing library of ArcObjects and is implemented by the GeoProcessor
CoClass.

IGeoProcessor2 gp = new GeoProcessorClass();
//add the result of geoprocessing as a new layer to Map
gp.AddOutputsToMap = true;
//if output of geoprocessing exists before the execution of tool
//it will be overwritten
gp.OverwriteOutput = true;

Assume that you want to create Thiessen polygons for the cities FeatureClass to create proximal
zones for all cities. The proximal zones represent full areas where any location inside the zone is
closer to its associated city than any other city. Based on the Create Thiessen Polygons reference
page, you have to provide at least an input point FeatureLayer and the path to the output
FeatureClass.
In order to create and set each parameter, the IVariantArray interface of the System library must
be used.

IVariantArray parameters = new VarArrayClass();

Each parameter has to be added to the IVariantArray interface in the exact order that is specified
on the tool’s reference page.

//in_features
parameters.Add(@"D:\DataFolder\fileGDB.gdb\cities");
//out_feature_class
parameters.Add(@"D:\DataFolder\fileGDB.gdb\citiesThiessen");
//fields_to_copy(Optional)
parameters.Add("ALL");

As it is illustrated on the Create Thiessen Polygons reference page, the third parameter is optional.
You can simply not add any value to IVariantArray or, as shown in the preceding code, you can
provide an appropriate value for the optional parameter. You can skip the optional parameter
using an empty string as input to IVariantArray’s Add() method. For example, look at the
reference page of the Buffer tool; you can see that three of the seven available parameters are
mandatory. The following code demonstrates how to skip the fourth parameter and specify the
fifth parameter:

//1-in_features
parameters.Add(@"D:\test.gdb\cities");
//2-out_feature_class
parameters.Add(@"D:\test.gdb\citiesBuffer");
//3-buffer_distance_or_field
parameters.Add("50 kilometers");
//4-line_side(Optional)
parameters.Add("");
//5-line_end_type(Optional)
parameters.Add("ROUND");
//6 &7 there is no need to provide empty string
//for the rest of parameters since you don't want to set them
After setting all the required parameters, all you need to run a tool is to call the Execute() method
of the geoprocessor object. The Execute() method solicits the name of the tool and its parameters.

gp.Execute("CreateThiessenPolygons_analysis", parameters, null);
The following code shows the complete code for this example. In order to run the code, you need to
add references to the Geoprocessing and System libraries of ArcObjects:
IGeoProcessor2 gp = new GeoProcessorClass();
//add the result of geoprocessing as a new layer to Map
gp.AddOutputsToMap = true;
//if output of geoprocessing exists before the execution of tool
//it will be overwritten
gp.OverwriteOutput = true;
IVariantArray parameters = new VarArrayClass();
//in_features
parameters.Add(@"D:\DataFolder\fileGDB.gdb\cities");
//out_feature_class
parameters.Add(@"D:\DataFolder\fileGDB.gdb\citiesThiessen");
//fields_to_copy(Optional)
parameters.Add("ALL");
//or parameters.Add("");
gp.Execute("CreateThiessenPolygons_analysis", parameters, null);


The Geoprocessing library of ArcObjects is accessible through the ESRI.ArcGIS.Geoprocessing
namespace. This library contains a few hundred types which can be used to run and manage tools
and GIS workfl ows. You learned earlier in this section that IGeoProcessor2 is the main interface of
this library and the easiest way to run a geoprocessing tool is to call its Execute() method.
However, using IGeoProcessor2 is not the only approach to run a geoprocessing tool or model.
There are some managed assemblies created by Esri to performing geoprocessing in a managed
way. A managed way means there is a native .NET assembly (the Geoprocessor assembly) that is
a wrapper for some types in the Geoprocessing library of ArcObjects, and there are other .NET
assemblies for each system toolbox.
These native .NET assemblies provide an even easier way to run a system tool. In general, the
procedure for running a tool using the Geoprocessor-managed assembly is the same as running a tool

Working with Group layers through Python

 This tool will be helpful in accessing the Trace Managaement Results

TOOL USED:  arcpy.mapping

Python script will be deployed in the ARC Toolbox to create the Conversion Tool

WORKING OF THE TOOL:

This tool will iterate through each layer in the group layer and perform operation on each layer for every iterations

PROCEDURE:

·         Create a New Script tool in your toolbox of your ArcCatalog

·         Set any empty python code file as source file in which you are going to write your script

·         Set Output layer as input parameter and group layers as the data Type

·         Copy the following code into your python code file

import arcpy

from arcpy import env

arcpy.env.overwriteOutput=1

outputgrouplayer=arcpy.GetParameter(0)

#Assign the output group layer to a variable, to be used later

lyrs =outputgrouplayer

print lyrs

#Create a Mapping Layer out of the Group Layer

groupLayer = arcpy.mapping.Layer(lyrs)

#Get a list of all the mappping layers, the first return will be the Group Layer itself

newLyrs = arcpy.mapping.ListLayers(groupLayer)

#Iterate through all of the Layers (mapping layers)

for lyr in newLyrs:

    #Because the first return is the group layer itself, we check for this, and move on

    if not lyr.isGroupLayer:

        print "Layer name is: {0}. Count is: {1}.".format(lyr.name, str(arcpy.GetCount_management(lyr)))

• This will print the layer name and count of feature for every layer in the Group layer inputted
•  Run the script tool and target your group layer as the input in the parameter box. Click on Ok
• Now it is Party time. Happy Coding