大虾帮忙看看程序吧

lanhaiou

整个程序主要是为了从dwg文件中得到图块的包罗矩形的两个点.(不知道有没有其他的方法)

下面怎么老是得不到 包络矩形的两个点呢?

只会得到**Error on get the extents point...

不知道是那里出问题了?大虾们帮忙看看吧

//插入图形
 
 Acad::ErrorStatus es;
 CString filename="E:\\AutoCAD\\dwgfile\\qq.dwg";//已经存在的文件
 AcDbDatabase *pNewDb=new AcDbDatabase(Adesk::kFalse);
 es=pNewDb->readDwgFile(filename,_SH_DENYNO,false);
 if(es!=Acad::eOk)
 {
  acutPrintf("\nThe file %s cannot be opend",filename);
  return;
 }
 
 AcDbDatabase *pDb;
 pDb=acdbHostApplicationServices()->workingDatabase();

 CString pBlockName="testblock";
 AcDbObjectId blockID;
 
 if((es=pDb->insert(blockID, pBlockName,pNewDb,true))==Acad::eOk)
 { acutPrintf("\ninsert ok\n");
  delete pNewDb;}
 else
 { AfxMessageBox("Insert failed");
  delete pNewDb;
  return; }

 
 AcGePoint3d pt(100.0,200.0,0.0);
 AcDbBlockReference *pBlkRef = new AcDbBlockReference;
 pBlkRef->setBlockTableRecord(blockID);//指向blockId;
 pBlkRef->setPosition(pt);//设定位置 

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

 AcDbBlockTableRecord *pBlockTableRecord;
 pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
 pBlockTable->close();
 AcDbObjectId newEntId;
 pBlockTableRecord->appendAcDbEntity(newEntId, pBlkRef);
 pBlockTableRecord->close();
 pBlkRef->close();

///////取得包络矩形的两个顶点

  AcDbEntity *pEnt;
  acdbOpenAcDbEntity(pEnt,newEntId,AcDb::kForRead);

 AcDbExtents exts;
  if(pEnt->getGeomExtents(exts)!=Acad::eOk);
  {
   acutPrintf("\n**Error on get the extents point...");
   pEnt->close();
   return;
  }
  acutPrintf("\nThe maxPoint=%0.4f,%0.4f",exts.maxPoint()[X],exts.maxPoint()[Y]);
  acutPrintf("\nThe minPoint=%0.4f,%0.4f",exts.minPoint()[X],exts.minPoint()[Y]);
  pEnt->close();

easypower

你这种好象要通过事务处理才能实现

lanhaiou

哦，可是必须要事务处理吗？

不能把图块读到当前数据库中，再对图块操作吗？

lanhaiou

好了，问题解决了。这样就得到了。谢谢easypower 的答复

 Acad::ErrorStatus es;
 CString filename="E:\\autocad\\dwgfile\\qq.dwg";//已经存在的文件
 AcDbDatabase *pNewDb=new AcDbDatabase(Adesk::kFalse);
 es=pNewDb->readDwgFile(filename,_SH_DENYNO,false);
 if(es!=Acad::eOk)
 {
  acutPrintf("\nThe file %s cannot be opend",filename);
  return;
 }
 
 AcDbDatabase *pDb;
 pDb=acdbHostApplicationServices()->workingDatabase();

 CString pBlockName="testblock";
 AcDbObjectId blockID;
 
 if((es=pDb->insert(blockID, pBlockName,pNewDb,true))==Acad::eOk)
 { acutPrintf("\ninsert ok\n");
  delete pNewDb;}
 else
 { AfxMessageBox("Insert failed");
  delete pNewDb;
  return; }

 //
 AcDbExtents exts;
 //
 AcDbBlockReference *pBlkRef = new AcDbBlockReference;
 pBlkRef->setBlockTableRecord(blockID);//指向blockId;

 //
 pBlkRef->getGeomExtents(exts);
  acutPrintf("\nThe maxPoint=%0.4f,%0.4f",exts.maxPoint()[X],exts.maxPoint()[Y]);
  acutPrintf("\nThe minPoint=%0.4f,%0.4f",exts.minPoint()[X],exts.minPoint()[Y]);
 //
 pBlkRef->close();

 

不过,如果程序这样写

if(pBlkRef->getGeomExtents(exts)!=Acad::eOk)

{

acutPrintf("\nerror\n");

}

if中的语句会是“假”，得到error，不知道为什么啊？