图块分解

AcDbBlockTable *pBT1;  acdbCurDwg()->getBlockTable(pBT1,AcDb::kForRead);app  AcDbBlockTableRecord *pBTR1;  pBT1->getAt(ACDB_MODEL_SPACE,pBTR1,AcDb::kForWrite);  AcDbBlockTableRecordIterator * pBTRIt;g
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