Search Text In DWG AutoCAD File

Search Text In DWG AutoCAD File

Aspose.CAD for .NET API allows you to search text in a DWG AutoCAD file. Aspose.CAD API exposes the CadText class that represents text entities in the DWG AutoCAD file. The CadMText class is also included in the Aspose.CAD API because some other entities may also contain text. Following is the code demonstration of the text search in the DWG AutoCAD file. The code snippet is self-explanatory.

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "search.dwg";
// Load an existing DWG file as CadImage.
using (Aspose.CAD.FileFormats.Cad.CadImage cadImage = (Aspose.CAD.FileFormats.Cad.CadImage)Aspose.CAD.Image.Load(sourceFilePath))
{
    // Search for text in the file 
    foreach (Aspose.CAD.FileFormats.Cad.CadObjects.CadBaseEntity entity in cadImage.Entities)
    {
        // Please, note: we iterate through CadText entities here, but some other entities may contain text also, e.g. CadMText and others
        IterateCADNodes(entity);
    }

    // Search for text on specific layout get all layout names and link each layout with corresponding block with entities
    Aspose.CAD.FileFormats.Cad.CadLayoutDictionary layouts = cadImage.Layouts;
    string[] layoutNames = new string[layouts.Count];
    int i = 0;
    foreach (Aspose.CAD.FileFormats.Cad.CadObjects.CadLayout layout in layouts.Values)
    {
        layoutNames[i++] = layout.LayoutName;
        System.Console.WriteLine("Layout " + layout.LayoutName + " is found");

        // Find block, applicable for DWG only
        Aspose.CAD.FileFormats.Cad.CadTables.CadBlockTableObject blockTableObjectReference = null;
        foreach (Aspose.CAD.FileFormats.Cad.CadTables.CadBlockTableObject tableObject in cadImage.BlocksTables)
        {
            if (string.Equals(tableObject.HardPointerToLayout, layout.ObjectHandle))
            {
                blockTableObjectReference = tableObject;
                break;
            }
        }

        if (blockTableObjectReference !=null)
        {
            // Collection cadBlockEntity.Entities contains information about all entities on specific layout if this collection has no elements it means layout is a copy of Model layout and contains the same entities
            Aspose.CAD.FileFormats.Cad.CadObjects.CadBlockEntity cadBlockEntity = cadImage.BlockEntities[blockTableObjectReference.BlockName];
        }
    }

    //Export to pdf
    Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions = new Aspose.CAD.ImageOptions.CadRasterizationOptions();
    rasterizationOptions.PageWidth = 1600;
    rasterizationOptions.PageHeight = 1600;
    rasterizationOptions.AutomaticLayoutsScaling = true;
    

    // Please, note: if cadBlockEntity collection mentioned above (for dwg) for selected layout or entitiesOnLayouts collection by layout's BlockTableRecordHandle (for dxf) is empty - export result file will be empty and you should draw Model layout instead
    rasterizationOptions.Layouts = new[] { "Layout1" };

    Aspose.CAD.ImageOptions.PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions();

    pdfOptions.VectorRasterizationOptions = rasterizationOptions;
    cadImage.Save(MyDir + "SearchText_out.pdf", pdfOptions);
}
            
        }

      
public static void SearchTextInDWGAutoCADFile() 
       {
// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "search.dwg";
// Load an existing DWG file as CadImage. 
CadImage cadImage = (CadImage) Image.Load(sourceFilePath); 
          
// Search for text in the entities section 
foreach (var entity in cadImage.Entities) { 
   IterateCADNodes(entity); 
} 

// Search for text in the block section 
foreach (CadBlockEntity blockEntity in cadImage.BlockEntities.Values) { 
   foreach (var entity in blockEntity.Entities) { 
       IterateCADNodes(entity); 
   } 
} 
       } 



private static void IterateCADNodes(CadBaseEntity obj) 
       { 
switch (obj.TypeName) { 
   case CadEntityTypeName.TEXT: 
       CadText childObjectText = (CadText) obj; 

       Console.WriteLine(childObjectText.DefaultValue); 

       break; 

   case CadEntityTypeName.MTEXT: 
       CadMText childObjectMText = (CadMText) obj; 

       Console.WriteLine(childObjectMText.Text); 

       break; 

   case CadEntityTypeName.INSERT: 
       CadInsertObject childInsertObject = (CadInsertObject) obj; 

       foreach (var tempobj in childInsertObject.ChildObjects) { 
           IterateCADNodes(tempobj); 
       } 
       break; 

   case CadEntityTypeName.ATTDEF: 
       CadAttDef attDef = (CadAttDef) obj; 

       Console.WriteLine(attDef.DefaultString); 
       break; 

   case CadEntityTypeName.ATTRIB: 
       CadAttrib attAttrib = (CadAttrib) obj; 

       Console.WriteLine(attAttrib.DefaultText); 
       break; 
} 
     
       
       }
     }