×
INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

SSIS and ArcGIS Rest API

SSIS and ArcGIS Rest API

SSIS and ArcGIS Rest API

(OP)
Hi,

I am trying to read data from a REST API from ESRI ArcGIS rest services, but I get the following error message when I try this:
SystemNullReferenceException: Object reference not set to an instance of an object. at ScriptMain.<CreateNewoutputRows>d__0.MoveNext()

I can read the array that gets back from the rest api, I can step thought all the data with a for loop and a messagebox for example, but when I try to put this in the OutputBuffer, it won't work.

Here is the code (the used website is password protected):
#region Help: Introduction to the Script Component
/* The Script Component allows you to perform virtually any operation that can be accomplished in
* a .Net application within the context of an Integration Services data flow.
*
* Expand the other regions which have "Help" prefixes for examples of specific ways to use
* Integration Services features within this script component. */
#endregion

#region Namespaces
using System;
using System.Data;
using System.Threading.Tasks;
using System.Windows.Forms;
using Esri.ArcGISRuntime.Http;
using Esri.ArcGISRuntime.Security;
using Esri.ArcGISRuntime.Tasks.Query;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;
#endregion

/// <summary>
/// This is the class to which to add your code. Do not change the name, attributes, or parent
/// of this class.
/// </summary>
[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPoint]
public class ScriptMain : UserComponent
{
#region Help: Using Integration Services variables and parameters
/* To use a variable in this script, first ensure that the variable has been added to
* either the list contained in the ReadOnlyVariables property or the list contained in
* the ReadWriteVariables property of this script component, according to whether or not your
* code needs to write into the variable. To do so, save this script, close this instance of
* Visual Studio, and update the ReadOnlyVariables and ReadWriteVariables properties in the
* Script Transformation Editor window.
* To use a parameter in this script, follow the same steps. Parameters are always read-only.
*
* Example of reading from a variable or parameter:
* DateTime startTime = Variables.MyStartTime;
*
* Example of writing to a variable:
* Variables.myStringVariable = "new value";
*/
#endregion

#region Help: Using Integration Services Connnection Managers
/* Some types of connection managers can be used in this script component. See the help topic
* "Working with Connection Managers Programatically" for details.
*
* To use a connection manager in this script, first ensure that the connection manager has
* been added to either the list of connection managers on the Connection Managers page of the
* script component editor. To add the connection manager, save this script, close this instance of
* Visual Studio, and add the Connection Manager to the list.
*
* If the component needs to hold a connection open while processing rows, override the
* AcquireConnections and ReleaseConnections methods.
*
* Example of using an ADO.Net connection manager to acquire a SqlConnection:
* object rawConnection = Connections.SalesDB.AcquireConnection(transaction);
* SqlConnection salesDBConn = (SqlConnection)rawConnection;
*
* Example of using a File connection manager to acquire a file path:
* object rawConnection = Connections.Prices_zip.AcquireConnection(transaction);
* string filePath = (string)rawConnection;
*
* Example of releasing a connection manager:
* Connections.SalesDB.ReleaseConnection(rawConnection);
*/
#endregion

#region Help: Firing Integration Services Events
/* This script component can fire events.
*
* Example of firing an error event:
* ComponentMetaData.FireError(10, "Process Values", "Bad value", "", 0, out cancel);
*
* Example of firing an information event:
* ComponentMetaData.FireInformation(10, "Process Values", "Processing has started", "", 0, fireAgain);
*
* Example of firing a warning event:
* ComponentMetaData.FireWarning(10, "Process Values", "No rows were received", "", 0);
*/
#endregion



public async override void CreateNewOutputRows()
{
/*
Add rows by calling the AddRow method on the member variable named "<Output Name>Buffer".
For example, call MyOutputBuffer.AddRow() if your output was named "MyOutput".
*/
SignOn();
// Query task initialization
var url = "https://tap-portal.com/arcgis/rest/services/Geodat...";

QueryTask queryTask = new QueryTask(new Uri(url));
//queryTask.ExecuteCompleted += QueryTask_ExecuteCompleted;
//queryTask.Failed += QueryTask_Failed;

// Query task parameters. Return geometry, state, and population density.
var timeWindow = new Esri.ArcGISRuntime.Data.TimeExtent(DateTime.Now.Subtract(new TimeSpan(0, 5, 0, 0)), DateTime.Now);

Query query = new Query(timeWindow);
query.Where = "1=1";
query.OutFields.AddRange(new string[] { "OBJECTID", "FIRSTNAME", "LASTNAME" });

// Use textbox text as query condition.
//query.Where = QueryTextBox.Text;



MyOutputBuffer.AddRow();
MyOutputBuffer.OBJECTID = 1;
MyOutputBuffer.LASTNAME = "Hoog";
MyOutputBuffer.FIRSTNAME = "Thomas";

MessageBox.Show("after addrow");



//for (int i = 1; i <= 100; i++)
//{
// MyOutputBuffer.AddRow();
// MyOutputBuffer.OBJECTID = i;
// MyOutputBuffer.FIRSTNAME = "Ram " + i.ToString();
//}


try
{
QueryResult queryResult = await queryTask.ExecuteAsync(query);

Esri.ArcGISRuntime.Data.FeatureSet resultFeatures = queryResult.FeatureSet;
MessageBox.Show(resultFeatures.Features.Count.ToString());

foreach (Esri.ArcGISRuntime.Data.Feature f in resultFeatures.Features)
{
//MessageBox.Show("test");
MessageBox.Show(f.Attributes["FIRSTNAME"]?.ToString()
+ f.Attributes["LASTNAME"]?.ToString()
+ f.Attributes["OBJECTID"].ToString());
MyOutputBuffer.AddRow();
MyOutputBuffer.OBJECTID = int.Parse(f.Attributes["OBJECTID"].ToString());
MyOutputBuffer.FIRSTNAME = f.Attributes["FIRSTNAME"]?.ToString();
MyOutputBuffer.LASTNAME = f.Attributes["LASTNAME"]?.ToString();

}


}
catch (Exception e)
{
MessageBox.Show(e.ToString());
MessageBox.Show("exceptions");
}

MessageBox.Show("einde");
}
public async Task<Credential> CreateHardCodedCredentialAsync(CredentialRequestInfo requestInfo)
{
var opts = new GenerateTokenOptions();
opts.TokenAuthenticationType = TokenAuthenticationType.ArcGISToken;

var cred = await IdentityManager.Current.GenerateCredentialAsync(
"https://tap-portal.com/arcgis/rest/services",
"*****",
"*****", opts);

return cred;
}

public void SignOn()
{
try
{
var myChallenger = new Esri.ArcGISRuntime.Security.ChallengeHandler
(this.CreateHardCodedCredentialAsync);
IdentityManager.Current.ChallengeHandler = myChallenger;
}
catch (ArcGISWebException webExp)
{
MessageBox.Show("Unable to authenticate with ArcGIS Server at PLEDoc: " + webExp.Message);
}
catch (Exception exp)
{
MessageBox.Show("Unable to load secured layer: " + exp.Message);
}
}
}

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close