This post is the latest in the series of closer looks at the new APIs in AutoCAD 2009. It covers the Data Extraction API, a new .NET API allowing you to drive the Data Extraction feature inside AutoCAD.
There is a very thorough C# sample included on the ObjectARX SDK (under samples/dotNet/DataExtraction), so I thought I'd focus on a much simpler example where we extract data from a single drawing.
Here's the C# code:
using System.Collections.Generic;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.DataExtraction;
namespace DataExtraction
{
public class Commands
{
const string path =
@"c:\Program Files\Autodesk\AutoCAD 2009\Sample\";
const string fileName =
"Visualization - Aerial.dwg";
const string outputXmlFile =
@"c:\temp\data-extract.xml";
[CommandMethod("extd")]
public void extractData()
{
if (!System.IO.File.Exists(path + fileName))
{
Document doc =
Application.DocumentManager.MdiActiveDocument;
Editor ed =
doc.Editor;
ed.WriteMessage("\nFile does not exist.");
return;
}
// Create some settings for the extraction
IDxExtractionSettings es =
new DxExtractionSettings();
IDxDrawingDataExtractor de =
es.DrawingDataExtractor;
de.Settings.ExtractFlags =
ExtractFlags.ModelSpaceOnly |
ExtractFlags.XrefDependent |
ExtractFlags.Nested;
// Add a single file to the settings
IDxFileReference fr =
new DxFileReference(path, path + fileName);
de.Settings.DrawingList.AddFile(fr);
// Scan the drawing for object types & their properties
de.DiscoverTypesAndProperties(path);
List<IDxTypeDescriptor> types =
de.DiscoveredTypesAndProperties;
// Select all the types and properties for extraction
// by adding them one-by-one to these two lists
List<string> selTypes = new List<string>();
List<string> selProps = new List<string>();
foreach (IDxTypeDescriptor type in types)
{
selTypes.Add(type.GlobalName);
foreach (
IDxPropertyDescriptor pr in type.Properties
)
{
if (!selProps.Contains(pr.GlobalName))
selProps.Add(pr.GlobalName);
}
}
// Pass this information to the extractor
de.Settings.SetSelectedTypesAndProperties(
types,
selTypes,
selProps
);
// Now perform the extraction itself
de.ExtractData(path);
// Get the results of the extraction
System.Data.DataTable dataTable =
de.ExtractedData;
// Output the extracted data to an XML file
if (dataTable.Rows.Count > 0)
{
dataTable.TableName = "My_Data_Extract";
dataTable.WriteXml(outputXmlFile);
}
}
}
}
Here are the first few objects from the output file found in c:\temp\data-extract.xml after running the EXTD command:
<?xml version="1.0" standalone="yes"?>
<DocumentElement>
<My_Data_Extract>
<AcDxHandleData>183</AcDxHandleData>
<Layer>0</Layer>
<LinetypeScale>1</LinetypeScale>
<PlotStyleName>ByLayer</PlotStyleName>
<LineWeight>ByLayer</LineWeight>
<Material>Material 3</Material>
<Linetype>ByLayer</Linetype>
<Color>ByLayer</Color>
<AcDxObjectTypeName>3D Solid</AcDxObjectTypeName>
<AcDxObjectTypeGlobalName>
Autodesk.AutoCAD.DatabaseServices.Solid3d
</AcDxObjectTypeGlobalName>
<AcDxDwgSummaryDwgName>
Visualization - Aerial.dwg
</AcDxDwgSummaryDwgName>
<AcDxDwgSummaryDwgLocation>
c:\Program Files\Autodesk\AutoCAD 2009\Sample
</AcDxDwgSummaryDwgLocation>
<AcDxDwgSummaryDwgSize>472480</AcDxDwgSummaryDwgSize>
<AcDxDwgSummaryDwgCreated>
2007-01-03T00:44:20+01:00
</AcDxDwgSummaryDwgCreated>
<AcDxDwgSummaryDwgModified>
2007-01-03T00:44:20+01:00
</AcDxDwgSummaryDwgModified>
<AcDxDwgSummaryDwgAccessed>
2008-03-03T11:40:53.796875+01:00
</AcDxDwgSummaryDwgAccessed>
<AcDxDwgSummaryDwgTitle />
<AcDxDwgSummaryDwgSubject />
<AcDxDwgSummaryDwgAuthor />
<AcDxDwgSummaryDwgKeywords />
<AcDxDwgSummaryDwgComments />
<AcDxDwgSummaryDwgHyperLinkBase />
<AcDxDwgSummaryDwgLastSavedBy>
thompsl
</AcDxDwgSummaryDwgLastSavedBy>
<AcDxDwgSummaryDwgRevisionNumber />
<AcDxDwgSummaryDwgTotalEditingTime>
1179
</AcDxDwgSummaryDwgTotalEditingTime>
<AcDxEntityHyperlink />
</My_Data_Extract>
<My_Data_Extract>
<AcDxHandleData>191</AcDxHandleData>
<Layer>0</Layer>
<LinetypeScale>1</LinetypeScale>
<PlotStyleName>ByLayer</PlotStyleName>
<LineWeight>ByLayer</LineWeight>
<Material>Material 3</Material>
<Linetype>ByLayer</Linetype>
<Color>ByLayer</Color>
<AcDxObjectTypeName>3D Solid</AcDxObjectTypeName>
<AcDxObjectTypeGlobalName>
Autodesk.AutoCAD.DatabaseServices.Solid3d
</AcDxObjectTypeGlobalName>
<AcDxDwgSummaryDwgName>
Visualization - Aerial.dwg
</AcDxDwgSummaryDwgName>
<AcDxDwgSummaryDwgLocation>
c:\Program Files\Autodesk\AutoCAD 2009\Sample
</AcDxDwgSummaryDwgLocation>
<AcDxDwgSummaryDwgSize>472480</AcDxDwgSummaryDwgSize>
<AcDxDwgSummaryDwgCreated>
2007-01-03T00:44:20+01:00
</AcDxDwgSummaryDwgCreated>
<AcDxDwgSummaryDwgModified>
2007-01-03T00:44:20+01:00
</AcDxDwgSummaryDwgModified>
<AcDxDwgSummaryDwgAccessed>
2008-03-03T11:40:53.796875+01:00
</AcDxDwgSummaryDwgAccessed>
<AcDxDwgSummaryDwgTitle />
<AcDxDwgSummaryDwgSubject />
<AcDxDwgSummaryDwgAuthor />
<AcDxDwgSummaryDwgKeywords />
<AcDxDwgSummaryDwgComments />
<AcDxDwgSummaryDwgHyperLinkBase />
<AcDxDwgSummaryDwgLastSavedBy>
thompsl
</AcDxDwgSummaryDwgLastSavedBy>
<AcDxDwgSummaryDwgRevisionNumber />
<AcDxDwgSummaryDwgTotalEditingTime>
1179
</AcDxDwgSummaryDwgTotalEditingTime>
<AcDxEntityHyperlink />
</My_Data_Extract>
<!-- Stuff deleted from the XML output -->
<!-- ... -->
</DocumentElement>
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