arcengine自己做一个工具Tool放到工具箱中

// Copyright 2010 ESRI
//
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
//
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
//
// See the use restrictions at <your ArcGIS install location>/DeveloperKit10.0/userestrictions.txt.
// 

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Geoprocessing;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.ADF.CATIDs;

namespace GPCalculateArea
{

    public class CalculateAreaFunction : IGPFunction2
    {
         private string m_ToolName = "CalculateArea"; //Function Name
        //Local members

        private string m_metadatafile = "CalculateArea_area.xml";
        private IArray m_Parameters;             // Array of Parameters
        private IGPUtilities m_GPUtilities;      // GPUtilities object

        public CalculateAreaFunction()
        {
            m_GPUtilities = new GPUtilitiesClass();
        }

        #region IGPFunction Members

        // Set the name of the function tool.
        // This name appears when executing the tool at the command line or in scripting.
        // This name should be unique to each toolbox and must not contain spaces.
        public string Name
        {
            get { return m_ToolName; }
        }

        // Set the function tool Display Name as seen in ArcToolbox.
        public string DisplayName
        {
            get { return "Calculate Area"; }
        }

        // This is the location where the parameters to the Function Tool are defined.
        // This property returns an IArray of parameter objects (IGPParameter).
        // These objects define the characteristics of the input and output parameters.
        public IArray ParameterInfo
        {
            get
            {
                //Array to the hold the parameters
                IArray parameters = new ArrayClass();

                //Input DataType is GPFeatureLayerType
                IGPParameterEdit3 inputParameter = new GPParameterClass();
                inputParameter.DataType = new GPFeatureLayerTypeClass();

                // Default Value object is GPFeatureLayer
                inputParameter.Value = new GPFeatureLayerClass();

                // Set Input Parameter properties
                inputParameter.Direction = esriGPParameterDirection.esriGPParameterDirectionInput;
                inputParameter.DisplayName = "Input Features";
                inputParameter.Name = "input_features";
                inputParameter.ParameterType = esriGPParameterType.esriGPParameterTypeRequired;
                parameters.Add(inputParameter);

                // Area field parameter
                inputParameter = new GPParameterClass();
                inputParameter.DataType = new GPStringTypeClass();

                // Value object is GPString
                IGPString gpStringValue = new GPStringClass();
                gpStringValue.Value = "Area";
                inputParameter.Value = (IGPValue)gpStringValue;

                // Set field name parameter properties
                inputParameter.Direction = esriGPParameterDirection.esriGPParameterDirectionInput;
                inputParameter.DisplayName = "Area Field Name";
                inputParameter.Name = "field_name";
                inputParameter.ParameterType = esriGPParameterType.esriGPParameterTypeRequired;
                parameters.Add(inputParameter);

                // Output parameter (Derived) and data type is DEFeatureClass
                IGPParameterEdit3 outputParameter = new GPParameterClass();
                outputParameter.DataType = new GPFeatureLayerTypeClass();

                // Value object is DEFeatureClass
                outputParameter.Value = new DEFeatureClassClass();

                // Set output parameter properties
                outputParameter.Direction = esriGPParameterDirection.esriGPParameterDirectionOutput;
                outputParameter.DisplayName = "Output FeatureClass";
                outputParameter.Name = "out_featureclass";
                outputParameter.ParameterType = esriGPParameterType.esriGPParameterTypeDerived;

                // Create a new schema object - schema means the structure or design of the feature class (field information, geometry information, extent)
                IGPFeatureSchema outputSchema = new GPFeatureSchemaClass();
                IGPSchema schema = (IGPSchema)outputSchema;

                // Clone the schema from the dependency.
                //This means update the output with the same schema as the input feature class (the dependency).
                schema.CloneDependency = true;               

                // Set the schema on the output because this tool will add an additional field.
                outputParameter.Schema = outputSchema as IGPSchema;
                outputParameter.AddDependency("input_features");
                parameters.Add(outputParameter);

                return parameters;
            }
        }

        // Validate:
        // - Validate is an IGPFunction method, and we need to implement it in case there
        //   is legacy code that queries for the IGPFunction interface instead of the IGPFunction2
        //   interface.
        // - This Validate code is boilerplate - copy and insert into any IGPFunction2 code..
        // - This is the calling sequence that the gp framework now uses when it QI's for IGPFunction2..
        public IGPMessages Validate(IArray paramvalues, bool updateValues, IGPEnvironmentManager envMgr)
        {
            if (m_Parameters == null)
                m_Parameters = ParameterInfo;

            // Call UpdateParameters().
            // Only Call if updatevalues is true.
            if (updateValues == true)
            {
                UpdateParameters(paramvalues, envMgr);
            }

            // Call InternalValidate (Basic Validation). Are all the required parameters supplied?
            // Are the Values to the parameters the correct data type?
            IGPMessages validateMsgs = m_GPUtilities.InternalValidate(m_Parameters, paramvalues, updateValues, true, envMgr);

            // Call UpdateMessages();
            UpdateMessages(paramvalues, envMgr, validateMsgs);

            // Return the messages
            return validateMsgs;
        }

        // This method will update the output parameter value with the additional area field.
        public void UpdateParameters(IArray paramvalues, IGPEnvironmentManager pEnvMgr)
        {
            m_Parameters = paramvalues;

            // Retrieve the input parameter value
            IGPValue parameterValue = m_GPUtilities.UnpackGPValue(m_Parameters.get_Element(0));

            // Get the derived output feature class schema and empty the additional fields. This will ensure you don't get duplicate entries.
            IGPParameter3 derivedFeatures = (IGPParameter3)paramvalues.get_Element(2);
            IGPFeatureSchema schema = (IGPFeatureSchema)derivedFeatures.Schema;
            schema.AdditionalFields = null;

            // If we have an input value, create a new field based on the field name the user entered.
            if  (parameterValue.IsEmpty() == false)
            {
                IGPParameter3 fieldNameParameter = (IGPParameter3)paramvalues.get_Element(1);
                string fieldName = fieldNameParameter.Value.GetAsText();

                // Check if the user's input field already exists
                IField areaField = m_GPUtilities.FindField(parameterValue, fieldName);
                if (areaField == null)
                {
                    IFieldsEdit fieldsEdit = new FieldsClass();
                    IFieldEdit fieldEdit = new FieldClass();
                    fieldEdit.Name_2 = fieldName;
                    fieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
                    fieldsEdit.AddField(fieldEdit);

                    // Add an additional field for the area values to the derived output.
                    IFields fields = fieldsEdit as IFields;
                    schema.AdditionalFields = fields;
                }

            }
        }

        // Called after returning from the update parameters routine.
        // You can examine the messages created from internal validation and change them if desired.
        public void UpdateMessages(IArray paramvalues, IGPEnvironmentManager pEnvMgr, IGPMessages Messages)
        {
            // Check for error messages
            IGPMessage msg = (IGPMessage)Messages;
            if (msg.IsError())
                return;    

            // Get the first Input Parameter
            IGPParameter parameter = (IGPParameter)paramvalues.get_Element(0);

            // UnPackGPValue. This ensures you get the value either form the dataelement or GpVariable (ModelBuilder)
            IGPValue parameterValue = m_GPUtilities.UnpackGPValue(parameter);

            // Open the Input Dataset - Use DecodeFeatureLayer as the input might be a layer file or a feature layer from ArcMap.
            IFeatureClass inputFeatureClass;
            IQueryFilter qf;
            m_GPUtilities.DecodeFeatureLayer(parameterValue, out inputFeatureClass, out qf);

            IGPParameter3 fieldParameter = (IGPParameter3)paramvalues.get_Element(1);
            string fieldName = fieldParameter.Value.GetAsText();

            // Check if the field already exists and provide a warning.
            int indexA = inputFeatureClass.FindField(fieldName);
            if (indexA > 0)
            {
                Messages.ReplaceWarning(1, "Field already exists. It will be overwritten.");
            }

            return;
        }

        // Execute: Execute the function given the array of the parameters
        public void Execute(IArray paramvalues, ITrackCancel trackcancel, IGPEnvironmentManager envMgr, IGPMessages message)
        {

            // Get the first Input Parameter
            IGPParameter parameter = (IGPParameter)paramvalues.get_Element(0);

            // UnPackGPValue. This ensures you get the value either form the dataelement or GpVariable (ModelBuilder)
           IGPValue parameterValue = m_GPUtilities.UnpackGPValue(parameter);

            // Open Input Dataset
            IFeatureClass inputFeatureClass;
            IQueryFilter qf;
            m_GPUtilities.DecodeFeatureLayer(parameterValue, out inputFeatureClass, out qf);

            if (inputFeatureClass == null)
            {
                message.AddError(2, "Could not open input dataset.");
                return;
            } 

            // Add the field if it does not exist.
            int indexA;

            parameter = (IGPParameter)paramvalues.get_Element(1);
            string field = parameter.Value.GetAsText();

            indexA = inputFeatureClass.FindField(field);
            if (indexA < 0)
            {
                IFieldEdit fieldEdit = new FieldClass();
                fieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
                fieldEdit.Name_2 = field;
                inputFeatureClass.AddField(fieldEdit);
            }

             int featcount = inputFeatureClass.FeatureCount(null);     

             //Set the properties of the Step Progressor
            IStepProgressor pStepPro = (IStepProgressor)trackcancel;
            pStepPro.MinRange = 0;
            pStepPro.MaxRange = featcount;
            pStepPro.StepValue = (1);
            pStepPro.Message = "Calculating Area";
            pStepPro.Position = 0;
            pStepPro.Show();

            // Create an Update Cursor
            indexA = inputFeatureClass.FindField(field);
            IFeatureCursor updateCursor = inputFeatureClass.Update(qf, false);
            IFeature updateFeature = updateCursor.NextFeature();
            IGeometry geometry;
            IArea area;
            double dArea;   

            while (updateFeature != null)
            {
                geometry = updateFeature.Shape;
                area = (IArea)geometry;
                dArea = area.Area;
                updateFeature.set_Value(indexA, dArea);
                updateCursor.UpdateFeature(updateFeature);
                updateFeature.Store();
                updateFeature = updateCursor.NextFeature();
                pStepPro.Step();
            }

           pStepPro.Hide();

            // Release the update cursor to remove the lock on the input data.
           System.Runtime.InteropServices.Marshal.ReleaseComObject(updateCursor);
        }

        // This is the function name object for the Geoprocessing Function Tool.
        // This name object is created and returned by the Function Factory.
        // The Function Factory must first be created before implementing this property.
        public IName FullName
        {
            get
            {
                // Add CalculateArea.FullName getter implementation
                IGPFunctionFactory functionFactory = new CalculateAreaFunctionFactory();
                return (IName)functionFactory.GetFunctionName(m_ToolName);
            }
        }

        // This is used to set a custom renderer for the output of the Function Tool.
        public object GetRenderer(IGPParameter pParam)
        {
            return null;
        }

        // This is the unique context identifier in a [MAP] file (.h).
        // ESRI Knowledge Base article #27680 provides more information about creating a [MAP] file.
        public int HelpContext
        {
            get { return 0; }
        }

        // This is the path to a .chm file which is used to describe and explain the function and its operation.
        public string HelpFile
        {
            get { return ""; }
        }

        // This is used to return whether the function tool is licensed to execute.
        public bool IsLicensed()
        {
            IAoInitialize aoi = new AoInitializeClass();
            ILicenseInformation licInfo = (ILicenseInformation)aoi;

            string licName = licInfo.GetLicenseProductName(aoi.InitializedProduct());

            if (licName == "ArcInfo")
            {
                 return true;
            }
            else
                return false;
        }

        // This is the name of the (.xml) file containing the default metadata for this function tool.
        // The metadata file is used to supply the parameter descriptions in the help panel in the dialog.
        // If no (.chm) file is provided, the help is based on the metadata file.
        // ESRI Knowledge Base article #27000 provides more information about creating a metadata file.
        public string MetadataFile
        {
            get { return m_metadatafile; }
        }

        // By default, the Toolbox will create a dialog based upon the parameters returned
        // by the ParameterInfo property.
        public UID DialogCLSID
        {
            // DO NOT USE. INTERNAL USE ONLY.
            get { return null; }
        }

        #endregion
    }

    //////////////////////////////
    // Function Factory Class
    ////////////////////////////
    [
    Guid("2554BFC7-94F9-4d28-B3FE-14D17599B35A"),
    ComVisible(true)
    ]
    public class CalculateAreaFunctionFactory : IGPFunctionFactory
    {
        private const string m_ToolName = "ylArea"; //Function Name
        // Register the Function Factory with the ESRI Geoprocessor Function Factory Component Category.
        #region "Component Category Registration"
        [ComRegisterFunction()]
        static void Reg(string regKey)
        {

            GPFunctionFactories.Register(regKey);
        }

        [ComUnregisterFunction()]
        static void Unreg(string regKey)
        {
            GPFunctionFactories.Unregister(regKey);
        }
        #endregion

        // Utility Function added to create the function names.
        private IGPFunctionName CreateGPFunctionNames(long index)
        {
            IGPFunctionName functionName = new GPFunctionNameClass();
            functionName.MinimumProduct = esriProductCode.esriProductCodeProfessional;
            IGPName name;

            switch (index)
            {
                case (0):
                    name = (IGPName)functionName;
                    name.Category = "AreaCalculation";
                    name.Description = "Calculate Area for FeatureClass";
                    name.DisplayName = "Calculate Area";
                    name.Name = m_ToolName;
                    name.Factory = (IGPFunctionFactory)this;
                    break;
            }

            return functionName;
        }

        // Implementation of the Function Factory
        #region IGPFunctionFactory Members

        // This is the name of the function factory.
        // This is used when generating the Toolbox containing the function tools of the factory.
        public string Name
        {
            get { return m_ToolName; }
        }

        // This is the alias name of the factory.
        public string Alias
        {
            get { return "area"; }
        }

        // This is the class id of the factory.
        public UID CLSID
        {
            get
            {
                UID id = new UIDClass();
                id.Value = this.GetType().GUID.ToString("B");
                return id;
            }
        }

        // This method will create and return a function object based upon the input name.
        public IGPFunction GetFunction(string Name)
        {
            switch (Name)
            {
                case (m_ToolName):
                    IGPFunction gpFunction = new CalculateAreaFunction();
                    return gpFunction;
            }

            return null;
        }

        // This method will create and return a function name object based upon the input name.
        public IGPName GetFunctionName(string Name)
        {
            IGPName gpName = new GPFunctionNameClass();

            switch (Name)
            {
                case (m_ToolName):
                    return (IGPName)CreateGPFunctionNames(0);

            }
            return null;
        }

        // This method will create and return an enumeration of function names that the factory supports.
        public IEnumGPName GetFunctionNames()
        {
            IArray nameArray = new EnumGPNameClass();
            nameArray.Add(CreateGPFunctionNames(0));
            return (IEnumGPName)nameArray;
        }

        // This method will create and return an enumeration of GPEnvironment objects.
        // If tools published by this function factory required new environment settings,
        //then you would define the additional environment settings here.
        // This would be similar to how parameters are defined.
        public IEnumGPEnvironment GetFunctionEnvironments()
        {
            return null;
        }

        #endregion
    }

}