Topic: Last group in drawing

[BillZndl]

For some reason, if I open the group dialog, then just rename a group and hit okay,
the group dialog closes but the main modeless form remains dead.

Is there a better way to prevent working with the modeless form
while another dialog is up or if another command is running?

The better way is to use the finally statement :

private void button6_Click(object sender, EventArgs e)
        {
          try
           {
            if (Autodesk.AutoCAD.ApplicationServices.Application.IsQuiescent)
            {
                base.Enabled = false;
                OpenGroupCommandDialog.CallGroupCommand();
            }
           }
          catch (SytemException exception)
            {
              Message.Show{ blah blah blah};
             }
          finally
             {
              base.Enabled = true;
             }
        }

The finally statement is executed no matter what.
 

[It's Alive!]

try this and see if it works  

Code: [Select]

using System;
using System.Collections.Generic;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Runtime;
using AcAp = Autodesk.AutoCAD.ApplicationServices;
using AcDb = Autodesk.AutoCAD.DatabaseServices;
using AcEd = Autodesk.AutoCAD.EditorInput;

[assembly: CommandClass(typeof(ExecMethod.Commands))]

namespace ExecMethod
{
 public class Commands
 {
  [CommandMethod("lastgroup")]
  static public void lastgroup()
  {
   try
   {
    AcAp.Document activeDocument = AcAp.Application.DocumentManager.MdiActiveDocument;
    AcEd.Editor editor = activeDocument.Editor;
    AcDb.Database database = HostApplicationServices.WorkingDatabase;
    AcDb.TransactionManager manager = activeDocument.TransactionManager;
    List<Int64> handleVals = new List<Int64>();

    using(Transaction transaction = manager.StartTransaction())
    {
     AcDb.DBDictionary groupDictionary =
       transaction.GetObject(database.GroupDictionaryId, OpenMode.ForRead)
          as AcDb.DBDictionary;

     foreach(DBDictionaryEntry item in groupDictionary)
     {
       AcDb.Group group =
         transaction.GetObject(item.Value, OpenMode.ForRead)
           as AcDb.Group;
       if (group.NumEntities > 0)
        handleVals.Add(item.Value.Handle.Value);
     }

     if(handleVals.Count > 0)
     {
      handleVals.Sort();
      handleVals.Reverse();
      AcDb.Group lastgroup =
        transaction.GetObject(database.GetObjectId
          (false, new Handle(handleVals[0]), 0), OpenMode.ForRead)
             as AcDb.Group;

      editor.WriteMessage(lastgroup.Name);
     }
    }
   }
   catch (System.Exception ex)
   {
    AcAp.Application.DocumentManager.
      MdiActiveDocument.Editor.WriteMessage
       ("\n{0}\n{1}", ex.Message, ex.StackTrace);
   }
  }
 }
}


[BillZndl]

Thanks, but no it doesn't work.
I keep getting "DBDictionaryEntry could not be found" error.
Probably because I'm using VS2005 ex and net 2.0?



 

[BillZndl]

try this and see if it works   

Okay, now that I take a better look at it, this does simplify what I was doing.

I never would've thought to sort the handle values directly, then get the objectId of the group from the value. 

This also eliminates the sorted list, which I understand is the same as using 2 arrays, so I'll assume for now that the List<int64> is a more efficient way to handle things, not to mention the reverse method which the sorted list doesn't have.

I chose to not check the group for number of entities as I list them even if empty

and to obtain the Object id using the GetAt method (don't know if it's better than opening for read or not, I'm thinking it is ).

The DBDictionaryEntry = DictionaryEntry on my platform.

Oh, one question, why do I see some using:

Code: [Select]

Group grp = (Group)tr.GetObject(db.GetObjectId(false, new Handle(handleVals[0]), 0), OpenMode.ForRead) as Group;When it works without using the "as Group":

Code: [Select]

Group grp = (Group)tr.GetObject(db.GetObjectId(false, new Handle(handleVals[0]), 0), OpenMode.ForRead);

Thanks for the tips!

Here's what I end up with, any critique appreciated, just don't get too carried away! 

Code: [Select]

using System;
using System.Collections;
using System.Collections.Generic;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.ApplicationServices;
using AcadApp = Autodesk.AutoCAD.ApplicationServices.Application;


namespace PartGroupsMonitor
{
    public class LastGroupInDrawing
    {
        public string FindLastGroup()
        {
          Document doc = AcadApp.DocumentManager.MdiActiveDocument;         
          Database db = HostApplicationServices.WorkingDatabase;
          List<Int64> handleVals = new List<Int64>();

          using (DocumentLock dloc = doc.LockDocument())
          {
              using (Transaction tr = db.TransactionManager.StartTransaction())
              {
                  DBDictionary groups = (DBDictionary)tr.GetObject(db.GroupDictionaryId, OpenMode.ForRead);
                  ObjectIdCollection objIDs = new ObjectIdCollection();

                  foreach (DictionaryEntry DicEnt in groups)
                  {
                      ObjectId Did = groups.GetAt(DicEnt.Key.ToString());                     
                      handleVals.Add(Did.Handle.Value);                     
                  }
                  if (handleVals.Count > 0)                     
                  {
                      handleVals.Sort();
                      handleVals.Reverse();
                      Group grp = (Group)tr.GetObject(db.GetObjectId(false, new Handle(handleVals[0]), 0), OpenMode.ForRead);

                      return grp.Name;
                  }
                  else
                  {
                      return "No";
                  }
              }           
          }
       }       
       
   }
}


[It's Alive!]

it's not a Visual Studio issue or a .NET issue, it's a managed library issue.
this should work with Acad05

Code: [Select]

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

using Autodesk.AutoCAD.GraphicsInterface;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.LayerManager;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Colors;

using AcAp = Autodesk.AutoCAD.ApplicationServices;
using AcGe = Autodesk.AutoCAD.Geometry;
using AcRx = Autodesk.AutoCAD.Runtime;
using AcDb = Autodesk.AutoCAD.DatabaseServices;


[assembly: CommandClass(typeof(ExecMethod.Commands))]
namespace ExecMethod
{
 public class Commands
 {
  [CommandMethod("lastgroup")]
  static public void lastgroup()
  {
   try
   {
    AcAp.Document activeDocument = AcAp.Application.DocumentManager.MdiActiveDocument;
    AcDb.Database database = HostApplicationServices.WorkingDatabase;
    AcDb.TransactionManager manager = activeDocument.TransactionManager;
    List<Int64> handleVals = new List<Int64>();

    using (Transaction transaction = manager.StartTransaction())
    {
     AcDb.DBDictionary groupDictionary =
       transaction.GetObject(database.GroupDictionaryId, OpenMode.ForRead)
          as AcDb.DBDictionary;

     foreach (System.Collections.DictionaryEntry item in groupDictionary)
     {
      ObjectId id = (ObjectId)item.Value;
      AcDb.Group group =
        transaction.GetObject(id, OpenMode.ForRead)
          as AcDb.Group;
      if (group.NumEntities > 0)
       handleVals.Add(id.Handle.Value);
     }

     if (handleVals.Count > 0)
     {
      handleVals.Sort();
      handleVals.Reverse();
      Handle hnd = new Handle();
      hnd.Value = handleVals[0];
      AcDb.Group lastgroup =
        transaction.GetObject(database.GetObjectId
          (false, hnd, 0), OpenMode.ForRead)
             as AcDb.Group;

      AcAp.CommandLinePrompts.Message(lastgroup.Name);
     }
    }
   }
   catch (System.Exception ex)
   {
    AcAp.CommandLinePrompts.Message
     (String.Format("\n{0}\n{1}", ex.Message, ex.StackTrace));
   }
  }
 }
}



[It's Alive!]

oops, I see you got it