<?xml encoding=”UTF-8″>By Deepak Nadig
Here is a blog by Kean Walmsley, which demonstrates Extracting XML data from drawings.
To extract data from the selected objects of current drawing, following modification to the code in the Kean’s blog is required :
1) Current drawing name and path can be used in place of that of the external file.
2) Create a List<Handle> of selected objects.
2) The List<Handle> of selected objects to be assigned to the API “IDxDrawingDataExtractor.Settings.SelectedObjects”
Here is the modified code:
<p>using System;<br>using Autodesk.AutoCAD.Runtime;<br>using Autodesk.AutoCAD.ApplicationServices;<br>using Autodesk.AutoCAD.DatabaseServices;<br>using Autodesk.AutoCAD.Geometry;<br>using Autodesk.AutoCAD.EditorInput;</p>
<p>using System.Collections;<br>using System.Collections.Specialized;</p>
<p>using System.Collections.Generic;<br>using Autodesk.AutoCAD.DataExtraction;<br>using System.IO;</p>
<p>namespace DataExtraction<br>{</p>
<p>// This class is instantiated by AutoCAD for each document when<br> // a command is called by the user the first time in the context<br> // of a given document. In other words, non static data in this class<br> // is implicitly per-document!<br> public class MyCommands<br> {<br> const string outputXmlFile =<br> @"c:tempExtAttr.xml";</p>
<p>[CommandMethod("extd")]<br> public void extractData()<br> {<br> Document doc = Application.DocumentManager.MdiActiveDocument;<br> Database db = doc.Database;<br> Editor ed = doc.Editor;<br> string fileName = Path.GetFileName(doc.Name); <br> string path = Path.GetDirectoryName(doc.Name) + "\";</p>
<p>try<br> {<br> if (!System.IO.File.Exists(path + fileName))<br> {<br> ed.WriteMessage("nFile does not exist.");<br> return;<br> }</p>
<p>//List to get handle of all the selected objects<br> List<Handle> selObjsHandle = new List<Handle>();</p>
<p>PromptSelectionResult selectionRes = ed.SelectImplied();<br> // If there's no pickfirst set available...<br> if (selectionRes.Status == PromptStatus.Error)<br> {<br> // ... ask the user to select entities<br> PromptSelectionOptions selectionOpts = new PromptSelectionOptions();<br> selectionOpts.MessageForAdding = "nSelect objects to extract data: ";<br> selectionRes = ed.GetSelection(selectionOpts);<br> }<br> else<br> {<br> // If there was a pickfirst set, clear it<br> ed.SetImpliedSelection(new ObjectId[0]);<br> }</p>
<p>// If the user has not cancelled...<br> if (selectionRes.Status == PromptStatus.OK)<br> {<br> // ... take the selected objects one by one<br> Transaction tr =<br> doc.TransactionManager.StartTransaction();<br> try<br> {<br> ObjectId[] objIds =<br> selectionRes.Value.GetObjectIds();<br> foreach (ObjectId objId in objIds)<br> {</p>
<p>DBObject obj =<br> tr.GetObject(objId, OpenMode.ForRead);<br> Entity ent = (Entity)obj;<br> // This time access the properties directly<br> ed.WriteMessage("n Handle: " + ent.Handle.ToString());<br> selObjsHandle.Add(ent.Handle);<br> obj.Dispose();<br> }<br> // Although no changes were made, use Commit()<br> // as this is much quicker than rolling back<br> tr.Commit();<br> }<br> catch (Autodesk.AutoCAD.Runtime.Exception ex)<br> {<br> ed.WriteMessage(ex.Message);<br> tr.Abort();<br> }<br> }</p>
<p>// Create some settings for the extraction</p>
<p>IDxExtractionSettings es =<br> new DxExtractionSettings();</p>
<p>IDxDrawingDataExtractor de =<br> es.DrawingDataExtractor;</p>
<p>de.Settings.ExtractFlags =<br> ExtractFlags.ModelSpaceOnly |<br> ExtractFlags.XrefDependent |<br> ExtractFlags.Nested;</p>
<p>// Add a single file to the settings</p>
<p>IDxFileReference fr =<br> new DxFileReference(path, path + fileName);</p>
<p>de.Settings.DrawingList.AddFile(fr);</p>
<p>//selected objects handle list assigned to IDxDrawingDataExtractor<br> de.Settings.SelectedObjects = selObjsHandle;</p>
<p>// Scan the drawing for object types & their properties<br> de.DiscoverTypesAndProperties(path);</p>
<p>List<IDxTypeDescriptor> types = de.DiscoveredTypesAndProperties;</p>
<p>// Select all the types and properties for extraction<br> // by adding them one-by-one to these two lists</p>
<p>List<string> selTypes = new List<string>();<br> List<string> selProps = new List<string>();</p>
<p>foreach (IDxTypeDescriptor type in types)<br> {<br> selTypes.Add(type.GlobalName);<br> foreach (<br> IDxPropertyDescriptor pr in type.Properties<br> )<br> {<br> if (!selProps.Contains(pr.GlobalName))<br> selProps.Add(pr.GlobalName);<br> }<br> }</p>
<p>// Pass this information to the extractor<br> de.Settings.SetSelectedTypesAndProperties(<br> types,<br> selTypes,<br> selProps<br> );</p>
<p>// Now perform the extraction itself<br> de.ExtractData(path);</p>
<p>// Get the results of the extraction<br> System.Data.DataTable dataTable =<br> de.ExtractedData;</p>
<p>// Output the extracted data to an XML file</p>
<p>if (dataTable.Rows.Count > 0)<br> {<br> dataTable.TableName = "My_Data_Extract";<br> dataTable.WriteXml(outputXmlFile);<br> }</p>
<p>}<br> catch (Autodesk.AutoCAD.Runtime.Exception ex)<br> {<br> ed.WriteMessage(ex.Message);<br> }<br> }</p>
<p>}</p>
<p>}</p>
<h3 class="entry-header"> </h3>
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