拡張データを割り当て、取得する(.NET)

拡張データ(xdata)を、図面内のオブジェクトのリンク情報として利用できます。

選択セット内のすべてのオブジェクトに拡張データを割り当てる

次の例では、図面からオブジェクトを選択するよう指示するプロンプトを表示します。選択したオブジェクトが選択セットに入れられ、指定した拡張データが選択セット内のすべてのオブジェクトにアタッチされます。

C# の例

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;

[CommandMethod("AttachXDataToSelectionSetObjects")]
public void AttachXDataToSelectionSetObjects()
{
    // Get the current database and start a transaction
    Database acCurDb;
    acCurDb = Application.DocumentManager.MdiActiveDocument.Database;

    Document acDoc = Application.DocumentManager.MdiActiveDocument;

    string appName = "MY_APP";
    string xdataStr = "This is some xdata";

    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Request objects to be selected in the drawing area
        PromptSelectionResult acSSPrompt = acDoc.Editor.GetSelection();

        // If the prompt status is OK, objects were selected
        if (acSSPrompt.Status == PromptStatus.OK)
        {
            // Open the Registered Applications table for read
            RegAppTable acRegAppTbl;
            acRegAppTbl = acTrans.GetObject(acCurDb.RegAppTableId, OpenMode.ForRead) as RegAppTable;

            // Check to see if the Registered Applications table record for the custom app exists
            if (acRegAppTbl.Has(appName) == false)
            {
                using (RegAppTableRecord acRegAppTblRec = new RegAppTableRecord())
                {
                    acRegAppTblRec.Name = appName;

                    acTrans.GetObject(acCurDb.RegAppTableId, OpenMode.ForWrite);
                    acRegAppTbl.Add(acRegAppTblRec);
                    acTrans.AddNewlyCreatedDBObject(acRegAppTblRec, true);
                }
            }

            // Define the Xdata to add to each selected object
            using (ResultBuffer rb = new ResultBuffer())
            {
                rb.Add(new TypedValue((int)DxfCode.ExtendedDataRegAppName, appName));
                rb.Add(new TypedValue((int)DxfCode.ExtendedDataAsciiString, xdataStr));

                SelectionSet acSSet = acSSPrompt.Value;

                // Step through the objects in the selection set
                foreach (SelectedObject acSSObj in acSSet)
                {
                    // Open the selected object for write
                    Entity acEnt = acTrans.GetObject(acSSObj.ObjectId,
                                                     OpenMode.ForWrite) as Entity;

                    // Append the extended data to each object
                    acEnt.XData = rb;
                }
            }
        }

        // Save the new object to the database
        acTrans.Commit();

        // Dispose of the transaction
    }
}

選択セット内のすべてのオブジェクトの拡張データを表示する

次の例では、前の例でアタッチした拡張データを表示します。文字列(タイプ 1000)以外の拡張データをアタッチする場合は、このコードを変更する必要があります。

C# の例

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;

[CommandMethod("ViewXData")]
public void ViewXData()
{
    // Get the current database and start a transaction
    Database acCurDb;
    acCurDb = Application.DocumentManager.MdiActiveDocument.Database;

    Document acDoc = Application.DocumentManager.MdiActiveDocument;

    string appName = "MY_APP";
    string msgstr = "";

    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Request objects to be selected in the drawing area
        PromptSelectionResult acSSPrompt = acDoc.Editor.GetSelection();

        // If the prompt status is OK, objects were selected
        if (acSSPrompt.Status == PromptStatus.OK)
        {
            SelectionSet acSSet = acSSPrompt.Value;

            // Step through the objects in the selection set
            foreach (SelectedObject acSSObj in acSSet)
            {
                // Open the selected object for read
                Entity acEnt = acTrans.GetObject(acSSObj.ObjectId,
                                                 OpenMode.ForRead) as Entity;

                // Get the extended data attached to each object for MY_APP
                ResultBuffer rb = acEnt.GetXDataForApplication(appName);

                // Make sure the Xdata is not empty
                if (rb != null)
                {
                    // Get the values in the xdata
                    foreach (TypedValue typeVal in rb)
                    {
                        msgstr = msgstr + "\n" + typeVal.TypeCode.ToString() + ":" + typeVal.Value;
                    }
                }
                else
                {
                    msgstr = "NONE";
                }

                // Display the values returned
                Application.ShowAlertDialog(appName + " xdata on " + acEnt.GetType().ToString() + ":\n" + msgstr);

                msgstr = "";
            }
        }

        // Ends the transaction and ensures any changes made are ignored
        acTrans.Abort();

        // Dispose of the transaction
    }
}