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As you already know that since you need to use COM API's AcadDocument.Export() to export WMF file, you need to build an AcadSelectionSet object.
After you create he AcadSelectionSet object, you have different ways to populate the AcadSelectionSet object.
1. Simply use the COM method AcadSelectionSet.Select()/Selectxxx(). It is very simple if you only need to select all entities.
2. If you like to write a lot of code and try .NET API way to select thinfs in AutoCAD, you can use .NET API's Editor.SelectXXX() method, as you did in your 2 posts. However, you must convert the selected objects in .NET API into correctc CPM API type in order to add them into AcadSelectionSet.
AcadSelectionSet.AddItems() takes an array of AcadEntity object, nothing else. which you did wrong in your 2 posted code snippets. In the first set of code, you tried to use Aitodesk.AutoCAD.EditorInput.SelectionSet as AcadSelectionSet. Naturally, they are not the same thing. In the second try, you tries to add and array of Autodesk.AutoCAD.DatabaseService.DBObject into AcadSelectionSet. Again, DBObject in .NET API is not the samething as COM API's AcadEntity.
Below is the code that worked (I used both COM API AcadSelectionSet.Select() and .NET API's Editor.SelectAll() to populate AcadSelectionSet, just to show how to do things in both way):
using System.Collections.Generic;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
[assembly: CommandClass(typeof(ExportWmf.MyCommands))]
namespace ExportWmf
{
public class MyCommands
{
private static string wmfFile=@"C:\Temp\MyDrawing";
[CommandMethod("WmfExport")]
public static void RunMyCommand()
{
Document dwg = Application.DocumentManager.MdiActiveDocument;
Editor ed = dwg.Editor;
AcadSelectionSet ss = null;
AcadDocument doc = (AcadDocument)dwg.AcadDocument;
try
{
AcadApplication app=Application.AcadApplication as AcadApplication;
app.ZoomExtents();
//--Use COM API to select objects
//ss = GetAcadSelectionSet1(doc);
//Use .NET API to select objects, and
//selected objects must to be cast to AcadEntity
//before populated into AcadSelecctionSet
ss = GetAcadSelectionSet2(dwg);
if (System.IO.File.Exists(wmfFile)) System.IO.File.Delete(wmfFile);
doc.Export(wmfFile, "WMF", ss);
}
catch (System.Exception ex)
{
ed.WriteMessage("\nCommand \"MyCmd\" failed:");
ed.WriteMessage("\n{0}\n{1}", ex.Message, ex.StackTrace);
}
finally
{
ss.Delete();
Autodesk.AutoCAD.Internal.Utils.PostCommandPrompt();
}
}
private static AcadSelectionSet GetAcadSelectionSet1(AcadDocument doc)
{
AcadSelectionSet ss = doc.SelectionSets.Add("WmfSet");
ss.Select(AcSelect.acSelectionSetAll);
return ss;
}
private static AcadSelectionSet GetAcadSelectionSet2(Document dwg)
{
AcadDocument doc = dwg.AcadDocument as AcadDocument;
AcadSelectionSet ss = doc.SelectionSets.Add("WmfSet");
List<AcadEntity> lst = new List<AcadEntity>();
PromptSelectionResult res = dwg.Editor.SelectAll();
if (res.Status == PromptStatus.OK)
{
using (Transaction tran = dwg.TransactionManager.StartTransaction())
{
foreach (ObjectId id in res.Value.GetObjectIds())
{
Entity ent = (Entity)tran.GetObject(id, OpenMode.ForRead);
lst.Add(ent.AcadObject as AcadEntity);
}
tran.Commit();
}
ss.AddItems(lst.ToArray());
return ss;
}
else
{
return null;
}
}
}
}
HTH
