arx读取dwg文件并选择块插入当前数据库的问题

oeuf 发表于 2004-10-12 16:34:00

请问关于arx读取文件的问题 用AcDbDatabase pDb建一个临时数据库 用它来读取dwg文件， pDb->readDwgFile(fileName); 然后得到所需块的id

AcDbBlockTable *pBlockTable; pDb->getBlockTable(pBlockTable, AcDb::kForRead);

AcDbBlockTableRecord *pBlockTableRecord; pBlockTable->getAt(blockName,blockId);//blockName已知 pBlockTable->close();

 这样得到blockId后如何将这个块插入到当前数据库并显示？ 谢谢！

pengst 发表于 2004-10-13 23:15:00

基本概念错误

想的太简单了

从一个文件中的块定义Id不能直接拿到另一个文件中作为块参照Id用的,给你一个函数参考

它将外部DWG文件中的块定义复制到当前文件中作为块定义,之后用这个块在当前文件中的块定义Id并插入

//将外部DWG中的块定义导入到当前图形中 //如果当前有同名块定义，则无论是否被参照都将被覆盖，同时参照实体更新 Acad::ErrorStatus ImportBlockDefineFromDwg(CString strSourceDwgFile,CString strBlockName,CString strNewBlockName) { AcDbDatabase* pSourceDb; Acad::ErrorStatus es;

//打开外部文件 pSourceDb=new AcDbDatabase(Adesk::kFalse); es=pSourceDb->readDwgFile(strSourceDwgFile); if (es!=Acad::eOk) { //ads_printf("Error readDwgFile %d",es); delete pSourceDb; return es; } //获取源文件中的块表 AcDbBlockTable *pBlockTable; #ifdef ACADR14 es=pSourceDb->getBlockTable(pBlockTable,AcDb::kForRead); #else es=pSourceDb->getSymbolTable(pBlockTable,AcDb::kForRead); #endif if (es!=Acad::eOk) { //ads_printf("Error getSymBolTable %d",es); delete pSourceDb; return es; } //寻找块strBlockName AcDbBlockTableRecord * pBlockTableRecord; es = pBlockTable->getAt(strBlockName,pBlockTableRecord,AcDb::kForRead); if (es!=Acad::eOk) { //源DWG中未找到块定义 delete pSourceDb; pBlockTable->close(); return es; }

//插入到目标DWG中 AcDbObjectId eId; AcGePoint3d ptBase; AcDbObjectIdArray ayBlock,aySolids; AcDbDatabase *pBlockDatabase; AcDbEntity *pEnt; ptBase.set(0,0,0);

//遍历源DWG中组成块定义的实体，并添加到实体表ayBlock中 AcDbBlockTableRecordIterator *pBlkIter; pBlockTableRecord->newIterator(pBlkIter); for (pBlkIter->start();!pBlkIter->done();pBlkIter->step()) { pBlkIter->getEntityId(eId); if (acdbOpenObject(pEnt,eId,AcDb::kForRead)==Acad::eOk) { if (pEnt->isKindOf(AcDbSolid::desc()) || pEnt->isKindOf(AcDb2dPolyline::desc()) || pEnt->isKindOf(AcDbPolyline::desc()) || pEnt->isKindOf(AcDbFace::desc()) || pEnt->isKindOf(CommonPolyline::desc()) || pEnt->isKindOf(CommonSolid::desc()) ) { aySolids.append(eId); } else { ayBlock.append(eId); } pEnt->close(); } } delete pBlkIter; //将aySolids中底实体按大至小排序,先显示大图形 int i; int iLen=aySolids.length(); if (iLen>0) { BOOL bExchange=TRUE; double dArea; AcDbExtents extEnt1,extEnt2; AcGePoint3d ptExt; AcDbObjectId eId1,eId2; AcDbEntity *pEnt1,*pEnt2;

while (bExchange==TRUE) { bExchange=FALSE; for (i=0;i<iLen-1;i++) { eId1=aySolids; eId2=aySolids; if (acdbOpenObject(pEnt1,eId1,AcDb::kForRead)==Acad::eOk) { if (acdbOpenObject(pEnt2,eId2,AcDb::kForRead)==Acad::eOk) { if (pEnt1->getGeomExtents(extEnt1)==Acad::eOk) { if (pEnt2->getGeomExtents(extEnt2)==Acad::eOk) { ptExt=extEnt1.minPoint(); ptExt=extEnt1.maxPoint(); dArea=fabs((ptExt-ptExt)*(ptExt-ptExt)); ptExt=extEnt2.minPoint(); ptExt=extEnt2.maxPoint(); dArea=fabs((ptExt-ptExt)*(ptExt-ptExt)); if (dArea<dArea) { bExchange=TRUE; aySolids=eId2; aySolids=eId1; } } } pEnt2->close(); } pEnt1->close(); } if (bExchange==TRUE) {break;} } } for (i=0;i<ayBlock.length();i++) {aySolids.append(ayBlock);} ayBlock=aySolids; } /////////////////////////////////////////////////////////////////////////////////// pBlockTableRecord->close(); pBlockTable->close();

//写新块数据到pBlockDatabase; es=pSourceDb->wblock(pBlockDatabase,ayBlock,ptBase); //ads_printf("\nwblock=%d",es);

AcDbObjectId eNewBlockId; //将数据pBlockDatabase读入到目标DWG中,新块定义eNewBlockId; es = CurrectWorkingDWG->insert(eNewBlockId, strNewBlockName, pBlockDatabase, Adesk::kTrue); //ads_printf("\nInsert=%d",es); delete pBlockDatabase; delete pSourceDb; return es; }

oeuf 发表于 2004-10-14 14:17:00

谢谢回复！！！不过我还想问问？？

我以前的做法是用一个临时数据库读取dwg文件，然后insert到当前数据库

但是这样的做就会把所有的块都先插入到当前数据库后，再选择自己想要的

如果我原来的那个dwg定义了10个block，而我只要插入一个的话，那就很不合理了，因为这10个都已经放到当前数据库了，并且还有一个newId，很浪费

不知道这个怎么解决？？？

AcDbDatabase *pDb = new AcDbDatabase(Adesk::kFalse); if (Acad::eOk != pDb->readDwgFile(path)) { acedAlert( "Error reading DWG!" ); return; }

AcDbObjectId newId; acdbHostApplicationServices()->workingDatabase()->insert(newId,"newBlock",pDb); delete pDb;

AcDbBlockTable *pBlockTable; acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable,AcDb::kForRead); AcDbObjectId blockId; pBlockTable->getAt(blockName,blockId);

AcDbBlockReference *pBlkRef=new AcDbBlockReference(); pBlkRef->setBlockTableRecord(blockId); AcDbBlockTableRecord *pBlockTableRecord; pBlockTable->getAt(ACDB_MODEL_SPACE,pBlockTableRecord,AcDb::kForWrite); pBlockTable->close();

pBlockTableRecord->appendAcDbEntity(pBlkRef); pBlockTableRecord->close(); pBlkRef->close();

后来我又找到doc里面有个sample，是讲clone的，它的做法也是用一个临时的Database读取，然后遍历到另一个database里，然后Insert到当前数据库

但是我把其中一个小地方改了一下就不行了，郁闷

它的源码是这样：

AcDbObjectId id; AcDbObjectIdArray list; AcDbDatabase extDatabase( Adesk::kFalse );

if (Acad::eOk != extDatabase.readDwgFile(path)) { acedAlert( "Error reading DWG!" ); return; } AcDbBlockTable* pBT; if (Acad::eOk != extDatabase.getSymbolTable( pBT, AcDb::kForRead )) { acedAlert( "Error getting BlockTable of DWG" ); return; }

AcDbBlockTableRecord* pBTR; Acad::ErrorStatus es = pBT->getAt( ACDB_MODEL_SPACE, pBTR, AcDb::kForRead ); pBT->close(); if (Acad::eOk != es) { acedAlert( "Error getting model space of DWG" ); return; }

 AcDbBlockTableRecordIterator* pIT; if (Acad::eOk != pBTR->newIterator( pIT )) { acedAlert( "Error iterating model space of DWG" ); pBTR->close(); return; }

 for ( ; !pIT->done(); pIT->step()) { if (Acad::eOk == pIT->getEntityId( id )) { acutPrintf(" %lx",id); list.append( id );

AcDbEntity *pEnt; if ( Acad::eOk == pIT->getEntity(pEnt, AcDb::kForRead)) { AcDbObjectId obj; if ((obj = pEnt->extensionDictionary()) != AcDbObjectId::kNull) { AcDbDictionary *pDict = NULL; acdbOpenObject(pDict, obj, AcDb::kForWrite); if (pDict) { pDict->setTreatElementsAsHard(Adesk::kTrue); pDict->close(); } } pEnt->close(); } } } delete pIT;

pBTR->close();

if (list.isEmpty()) { acedAlert( "No entities found in model space of DWG" ); return; }

AcDbDatabase *pTempDb;

if (Acad::eOk != extDatabase.wblock( pTempDb, list, AcGePoint3d::kOrigin )) { acedAlert( "wblock failed!" ); return; } if (Acad::eOk != acdbHostApplicationServices()->workingDatabase() ->insert( AcGeMatrix3d::kIdentity, pTempDb )) acedAlert( "insert failed!" );

delete pTempDb; 

它是遍历每个实体，而我只想要我自己想要的

所以我改成了这样

AcDbObjectId id; AcDbObjectIdArray list; AcDbDatabase extDatabase( Adesk::kFalse );

if (Acad::eOk != extDatabase.readDwgFile(path)) { acedAlert( "Error reading DWG!" ); return; } AcDbBlockTable* pBT; if (Acad::eOk != extDatabase.getSymbolTable( pBT, AcDb::kForRead )) { acedAlert( "Error getting BlockTable of DWG" ); return; }

pBT->getAt(blockName,id); //修改的地方 acutPrintf(" %lx",id); //修改的地方 list.append( id ); //修改的地方

if (list.isEmpty()) { acedAlert( "No entities found in model space of DWG" ); return; }

AcDbDatabase *pTempDb;

if (Acad::eOk != extDatabase.wblock( pTempDb, list, AcGePoint3d::kOrigin )) { acedAlert( "wblock failed!" ); return; } if (Acad::eOk != acdbHostApplicationServices()->workingDatabase() ->insert( AcGeMatrix3d::kIdentity, pTempDb )) acedAlert( "insert failed!" );

delete pTempDb;

这样就不行了

提示就是wblock failed!

这又是什么原因呢？照理说应该行的啊？

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