topic Re: Vertices or Grip Points of MULTILEADER in .NET Forum

Vertices or Grip Points of MULTILEADER

subash.nalla — Fri, 18 Apr 2025 12:27:42 GMT

Hi Team, I have to get the vertices or Grip points of a MULTILEADER and looking for C# code for that.

Re: Vertices or Grip Points of MULTILEADER

norman.yuan — Fri, 18 Apr 2025 16:15:28 GMT

Have you looked into/tried with MLeader.GetVertex(int, int) ? You may also need to look into MLeader.GetFirst[Last]Vertex(int).

Re: Vertices or Grip Points of MULTILEADER

subash.nalla — Mon, 21 Apr 2025 04:58:35 GMT

Hi Norman. I have tried both options but getting the attached exception (Exception.PNG). Can you please suggest me what I am doing wrong here.

This is my code, please let me know for any other information.

Entity ent = tr.GetObject(selObj.ObjectId, OpenMode.ForRead) as Entity;
MLeader mLeader = ent as MLeader;

Point3d pntFirst = mLeader.GetVertex(0, 0); or Point3d pntFirst = mLeader.GetFirstVertex(0);

I am getting same exception for when tried using both options.

Re: Vertices or Grip Points of MULTILEADER

norman.yuan — Mon, 21 Apr 2025 16:40:43 GMT

Well, following code works for me with a simple MLeader entity as shown in picture below:

[CommandMethod("MLTest")] public static void TestMLeader() { var dwg = CadApp.DocumentManager.MdiActiveDocument; var ed = dwg.Editor; var res = ed.GetEntity("\nSelect an MLEADER entity:"); if (res.Status == PromptStatus.OK) { using (var tran = dwg.TransactionManager.StartTransaction()) { var mleader = (MLeader)tran.GetObject(res.ObjectId, OpenMode.ForRead); var leaderIndex = (int)mleader.GetLeaderIndexes()[0]; var leaderlineIndexes = mleader.GetLeaderLineIndexes(leaderIndex); var leaderlineIndex = (int)leaderlineIndexes[0]; var firstVertex = mleader.GetFirstVertex(leaderlineIndex); var lastVertex = mleader.GetLastVertex(leaderlineIndex); ed.WriteMessage( $"\nFirst vertex = {firstVertex.ToString()}"); ed.WriteMessage( $"\nLast vertex = {lastVertex.ToString()}"); var vertex = mleader.GetVertex(leaderlineIndex, 0); ed.WriteMessage( $"\nFirst vertex of the first leader line = {vertex.ToString()}"); tran.Commit(); } } }

Basically, you need to call GetLeaderIndexes() and GetLeaderLineIndexes() to see if there is how many leaders and how many leader lines. there could be leader only (i.e. a leader without leader line). Since you need to get vertex on LEADERLINE, there must be at least one LeaderLine for your code to work.

Re: Vertices or Grip Points of MULTILEADER

subash.nalla — Tue, 22 Apr 2025 05:44:09 GMT

Hi Norman, thanks for the code sample and looks like I am able to get the vertices now and only thing missing in my code was

var leaderlineIndex = (int)leaderlineIndexes[0];

I was passing leaderlineIndexes to find the first or last vertex.