Error creating a map in a core host Application

AndreasRuloffs2 — Mon, 14 Mar 2022 12:47:11 GMT

Hi everybody,

I have to write an console application, that creates an lyrx-File of a wms-service.

I should be able to create a Layer using the Layer Factory, but it needs a map.

So I try to Create an empty Map first.

When I do, I get an Exception:

System.NullReferenceException
HResult = 0x80004003
Nachricht = Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
Quelle = ArcGIS.Desktop.Mapping
Stapelüberwachung:
at ArcGIS.Desktop.Mapping.MapFactory.<>c__DisplayClass5_0.<CreateMap>b__0()
at ArcGIS.Desktop.Internal.Mapping.Utilities.MakeBasicServiceCall[T](Func`1 serviceCall)
at ArcGIS.Desktop.Mapping.MapFactory.CreateMap(String name, MapType mapType, MapViewingMode defaultViewingMode, Basemap basemap)

Unfortunately I have no idea what my error is.

Thank you, for reading

Andreas Ruloffs

using ArcGIS.Core.CIM; using ArcGIS.Core.Hosting; using ArcGIS.Desktop.Framework.Threading.Tasks; using ArcGIS.Desktop.Mapping; using Microsoft.Win32; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Reflection; using System.Text; using System.Threading.Tasks; namespace ProCoreHost3 { class Program { //[STAThread] must be present on the Application entry point [STAThread] static void Main(string[] args) { AppDomain currentDomain = AppDomain.CurrentDomain; currentDomain.AssemblyResolve += new ResolveEventHandler(ResolveProAssemblyPath); if (args.Length != 3) { Console.Out.WriteLine("usage: CreateWMSLyr <wmsurl> <visibleLayer seperated by commas> <outputfile name"); Environment.Exit(1); } String wmsURL = args[0]; String visibleLayerStr = args[1]; String outFile = args[2]; String[] visibleLayer = visibleLayerStr.Split(new char[] { ',' }); MainAsync(wmsURL, visibleLayer, outFile).GetAwaiter().GetResult(); } static async Task MainAsync(String wmsURL, String[] visibleLayer, String outFile) { //Call Host.Initialize before constructing any objects from ArcGIS.Core try { Host.Initialize(); } catch (Exception e) { // Error (missing installation, no license, 64 bit mismatch, etc.) Console.WriteLine(string.Format("Initialization failed: {0}", e.Message)); return; } Map map = MapFactory.Instance.CreateMap("test", MapType.Map, MapViewingMode.Map, Basemap.None); CIMInternetServerConnection serverConnection = new CIMInternetServerConnection { URL = wmsURL }; CIMWMSServiceConnection connection = new CIMWMSServiceConnection { ServerConnection = serverConnection }; Layer layer = LayerFactory.Instance.CreateLayer(connection, MapView.Active.Map); LayerDocument layerdocument = new LayerDocument(layer); layerdocument.Save(outFile); } static Assembly ResolveProAssemblyPath(object sender, ResolveEventArgs args) { string folderPath = @"C:\Program Files\ArcGIS\Pro\bin"; //Get this from registry string assemblyPath = Path.Combine(folderPath, new AssemblyName(args.Name).Name + ".dll"); if (!File.Exists(assemblyPath)) return null; Assembly assembly = Assembly.LoadFrom(assemblyPath); return assembly; } } }

Re: Error creating a map in a core host Application

GKmieliauskas — Mon, 14 Mar 2022 13:36:51 GMT

Hi,

Corehost supports access to GDB and Geometry only. CoreHost application cannot use many of the constructs provided by the ArcGIS.Desktop dlls

Re: Error creating a map in a core host Application

Aashis — Mon, 14 Mar 2022 14:44:53 GMT

In addition to @GKmieliauskas , attempting to access any of the ArcGIS Pro UI elements or types in other assemblies in an ArcEngine-like fashion will crash the program.

Details: Corehost Conceptual doc

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Error creating a map in a core host Application

Re: Error creating a map in a core host Application

Re: Error creating a map in a core host Application