[每日一码] 获得属性块的所有属性值

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1. #include <dbobjptr.h>
2. void PrintBlockAttributes()
3. {
4.   // get the current database
5.   AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();
6.   assert(pDb);
8.   // in this sample we will only process block references in model space;
9.   // it is also possible to have block references in paper space
10.   // but I will leave it up to you to update the code to do so
11.   AcDbBlockTableRecordPointer pModelSpace(ACDB采用MODEL采用SPACE, pDb, AcDb::kForRead);
12.   assert(pModelSpace.openStatus() == Acad::eOk);
14.   // request an iterator for the entities in the block table record
15.   AcDbBlockTableRecordIterator *pIterator;
16.   pModelSpace->newIterator(pIterator);
18.   // iterate through each entity
19.   for( ; !pIterator->done(); pIterator->step())
20.   {
21.     AcDbObjectId id;
22.     pIterator->getEntityId(id);
23.     // we are only interested in block references;
24.     // ignore anything else
25.     AcDbObjectPointer<AcDbBlockReference> pBlockReference(id, AcDb::kForRead);
26.     if (pBlockReference.openStatus() != Acad::eOk)
27.       continue;
29.     // lets request the block reference for an attribute iterator
30.     AcDbObjectIterator *pAttributeIterator = NULL;
31.     pAttributeIterator = pBlockReference->attributeIterator();
33.     // iterate through each attribute and print its value
34.     for( ; !pAttributeIterator->done(); pAttributeIterator->step())
35.     {
36.       AcDbObjectId attributeId = pAttributeIterator->objectId();
37.       // open the attribute
38.       AcDbAttribute *pAttribute;
39.       Acad::ErrorStatus es = pBlockReference->openAttribute(pAttribute, attributeId, AcDb::kForRead);
40.       // finally; we are at a point where we have access tothe
41.       // value of the attribute -- for now, simply display it
43.       // AcDbAttribute is derived from AcDbText where the tag
44.       // value is stored
45.       ACHAR *pTag = pAttribute->tag();
46.       assert(pTag != NULL);
48.       ACHAR *pValue = pAttribute->textString();
49.       assert(pValue != NULL);
51.       // display
52.       acutPrintf(L"Tag: %s = Value: %s\n", pTag, pValue);
54.       // we no longer need this attribute so lets close it
55.       // and clean up the memory
56.       pAttribute->close();
57.       delete [] pTag;
58.       delete [] pValue;
59.     }
61.     // it is the programmer's responsibility to delete the
62.     // attribute iterator
63.     delete pAttributeIterator;
64.   }
66.   // it is the programmer's responsibility to delete the
67.   // block table record iterator
68.   delete pIterator;
69. }

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