objectarx代码 acedSSGet 选择集生成匿名块

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这段代码中，我们没有创建新的块定义，而是直接使用了一个空的AcDbObjectId来创建匿名块参照，然后将选中的每个实体移动到该匿名块中。请注意，匿名块的特点是它不会出现在块表中，而且通常仅用于临时存储或内部操作。当涉及到多个实体合并为一个整体时，这种方式可以简化处理流程，但请确保了解其适用场景和限制。

1. #include "acedinpt.h" // For acedSSGet
2. #include "dbmain.h" // For AcDbEntity and related classes
3. #include "dbidmap.h" // For AcDbIdMapping
5. // Function to create anonymous blocks from the selected set of entities
6. void CreateAnonymousBlocksFromSelection()
7. {
8.     ads采用name ss;
9.     struct resbuf rb;
11.     // Get the user selection
12.     acedSSGet(NULL, NULL, NULL, NULL, ss);
14.     // Check if there's a valid selection
15.     if (ss != RTNORM)
16.         return;
18.     AcDbVoidPtrArray entities;
19.     Acad::ErrorStatus es = acdbGsMarker(ss, entities);
20.     if (es != Acad::eOk)
21.     {
22.         acutPrintf("\nFailed to get entities from selection.");
23.         return;
24.     }
26.     if (entities.isEmpty())
27.     {
28.         acutPrintf("\nNo entities were selected.");
29.         return;
30.     }
32.     // Iterate over selected entities
33.     for (int i = 0; i < entities.length(); ++i)
34.     {
35.         AcDbEntity* pEnt;
36.         es = acdbOpenObject(pEnt, (AcDbObjectId)entities[i], AcDb::kForWrite);
37.         if (es == Acad::eOk)
38.         {
39.             AcGeMatrix3d oldToNew;
40.             oldToNew.setToIdentity();
42.             // Create an anonymous block reference
43.             AcDbBlockReference* pBlkRef = new AcDbBlockReference();
45.             // Instead of creating a named block, we'll use an empty objectId to create an anonymous block
46.             AcDbObjectId blkRecId = AcDbObjectId::kNull;
48.             pBlkRef->setBlockTableRecord(blkRecId);
49.             pBlkRef->setPosition(pEnt->position()); // Set insert point to entity's original position
50.             pBlkRef->setTransform(oldToNew);
52.             // Copy the entity into the anonymous block
53.             AcDbIdMapping idMap;
54.             es = pEnt->handOverTo(idMap, pBlkRef);
55.             if (es != Acad::eOk)
56.             {
57.                 delete pBlkRef;
58.                 acutPrintf("\nFailed to handover entity to anonymous block reference.");
59.                 continue;
60.             }
62.             // Erase the original entity and replace with the anonymous block reference
63.             pEnt->erase();
64.             pBlkRef->close(); // Close the block reference without explicitly opening it for write (since it was just created)
66.             // No need to close pEnt here as it should have been erased already
67.         }
68.     }
70.     // Clear the selection set
71.     acdbClear采用ss(ss);
72. }
74. // Call the function
75. CreateAnonymousBlocksFromSelection();

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