在 DWG AutoCAD 文件中搜索文本

在 DWG AutoCAD 文件中搜索文本

Aspose.CAD for .NET API 允许您在 DWG AutoCAD 文件中搜索文本。Aspose.CAD API 暴露了 CadText 类，该类表示 DWG AutoCAD 文件中的文本实体。 CadMText 类也包含在 Aspose.CAD API 中，因为其他一些实体也可能包含文本。以下是 DWG AutoCAD 文件中文本搜索的代码演示。代码片段自我解释。

// 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; 
} 
     
       
       }
     }