Re: Fatal Error while inserting block with DrawJig

GrzesiekGP · ‎01-14-2015

Hi!

I want to insert block with showing it when user is moving mouse.

I used this code:

http://adndevblog.typepad.com/autocad/2012/07/how-to-show-a-block-when-positioning-it-using-c.html

Everything works fine, but suddendly I'm getting fatal error.

The worst thing is that I don't know why.

It happens very rare and the only way to fix this, is copy everything to the new file.

In attachments I sent this file.

Maybe someone could help me? Or there is some other way to show block while inserting?

using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
 
 
namespace MySamples
{
 
  public class BlockJigCmds
  {
 
    // Ask the user to place the block named "TEST", showing it
    //   during the dragging.
    // Make sure that a block with this name exists in the drawing.
    //===============================================================
    [CommandMethod("BlockJig")]
    static public void BlockJig()
    {
      Editor ed =
              Application.DocumentManager.MdiActiveDocument.Editor;
      Database db = ed.Document.Database;
      try
      {
        using (Transaction tr =
                           db.TransactionManager.StartTransaction())
        {
          // Find the "TEST" block in the current drawing
          BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId,
                                                   OpenMode.ForRead);
          BlockTableRecord block = (BlockTableRecord)tr.GetObject(
                                       bt["TEST"], OpenMode.ForRead);
 
          // Create the Jig and ask the user to place the block
          //----------------------------------------------------
          MyBlockJig blockJig = new MyBlockJig();
          Point3d point;
          PromptResult res = blockJig.DragMe( block.ObjectId,
                                              out point);
          if (res.Status == PromptStatus.OK)
          {
            // Now we need to do the usual steps to place
            //   the block insert at the position where the user
            //   did the click
            BlockTableRecord curSpace =
              (BlockTableRecord)tr.GetObject(
                               db.CurrentSpaceId, OpenMode.ForWrite);
            BlockReference insert = new BlockReference(point,
                                                     block.ObjectId);
            curSpace.AppendEntity(insert);
            tr.AddNewlyCreatedDBObject(insert, true);
          }
          tr.Commit();
        } // using
      }
      catch (System.Exception ex)
      {
        ed.WriteMessage(ex.ToString());
      }
    } // BlockJig()
 
  } // class BlockJigCmds
 
 
  // This Jig will show the given block during the dragging.
  //=================================================================
  public class MyBlockJig : DrawJig
  {
    public Point3d _point;
    private ObjectId _blockId = ObjectId.Null;
 
    // Shows the block until the user clicks a point.
    // The 1st parameter is the Id of the block definition.
    // The 2nd is the clicked point.
    //---------------------------------------------------------------
    public PromptResult DragMe(ObjectId i_blockId, out Point3d o_pnt)
    {
      _blockId = i_blockId;
      Editor ed =
              Application.DocumentManager.MdiActiveDocument.Editor;
 
      PromptResult jigRes = ed.Drag(this);
      o_pnt = _point;
      return jigRes;
    }
 
 
    // Need to override this method.
    // Updating the current position of the block.
    //--------------------------------------------------------------
    protected override SamplerStatus Sampler(JigPrompts prompts)
    {
      JigPromptPointOptions jigOpts = new JigPromptPointOptions();
      jigOpts.UserInputControls =
                          (UserInputControls.Accept3dCoordinates |
                           UserInputControls.NullResponseAccepted);
      jigOpts.Message = "Select a point:";
      PromptPointResult jigRes = prompts.AcquirePoint(jigOpts);
 
      Point3d pt = jigRes.Value;
      if (pt == _point)
        return SamplerStatus.NoChange;
 
      _point = pt;
      if (jigRes.Status == PromptStatus.OK)
        return SamplerStatus.OK;
 
      return SamplerStatus.Cancel;
    }
 
 
    // Need to override this method.
    // We are showing our block in its current position here.
    //--------------------------------------------------------------
    protected override bool WorldDraw(
                  Autodesk.AutoCAD.GraphicsInterface.WorldDraw draw)
    {
      BlockReference inMemoryBlockInsert =
                               new BlockReference(_point, _blockId);
      draw.Geometry.Draw(inMemoryBlockInsert);
 
      inMemoryBlockInsert.Dispose();
 
      return true;
    } // WorldDraw()
 
  } // class BlockJig
 
} // namespace MySamples