为什么已经切换当前数据库，acedSSGet还是对老的数据库操作？

freejustin 发表于 2006-3-1 11:17:00

bool CBlueprintDrawing::CreateBlueprint(long lBluePrintTemplateID, int iPageNo) {  Acad::ErrorStatus es;  AcDbDatabase *pDb;  CString m_BlueprintFileFullName;  CString t_BlueprintTemplateFileName;
 pDb = new AcDbDatabase;
  //获取模板文件名  es = pDb->readDwgFile( t_BlueprintTemplateFileName);  if( es != Acad::eOk )  {   acutPrintf("\n没有发现 %c 文件!\n", t_BlueprintTemplateFileName);   delete pDb;   return false;  }
 AcDbDatabase *pOldDb = acdbHostApplicationServices()->workingDatabase();  acdbHostApplicationServices()->setWorkingDatabase(pDb);
 AcDbBlockTable *pBlockTable;     pDb->getSymbolTable(pBlockTable, AcDb::kForRead);  //acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead);
    AcDbBlockTableRecord *pBlockTableRecord;     pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);  pBlockTable->close();     //---- 绘制图形  CBlueprintDrawing::CreateTableGroup( pBlockTableRecord );    //---- 绘制图纸框架 //?????????????? 选择集出现问题 //如果pOldDb中在选择区域中有实体，就可以；反之不行。 //希望pDb中在选择区域中有实体，就可以；反之不行。 //pDb已经是当前数据库为什么还关联pOldDb  CBlueprintDrawing::CreateFrameLine( pBlockTableRecord );
 //---- 关闭块表  pBlockTableRecord->close();  
 //切换回原工作表  acdbHostApplicationServices()->setWorkingDatabase(pOldDb);  //保存图纸  pDb->saveAs(m_BlueprintFileFullName);
 delete pDb; }
bool CBlueprintDrawing::CreateFrameLine(AcDbBlockTableRecord *pBlockTableRecord) {  int stat;  long Number;  ads_name SSName;
 ads_point t_ptW0, t_ptW1;  AcGePoint3d ptW0(0, 0, 0), ptW1(0, 297, 0);
 Number = 0; 
 t_ptW0 = 210.0;  t_ptW0 = 0.0;  t_ptW0 = 0.0;
 t_ptW1 = 420.0;  t_ptW1 = 297.0;  t_ptW1 = 0.0;
 //建一个交叉窗口选择集  stat = acedSSGet("C", t_ptW0, t_ptW1, NULL, SSName);   if ( stat != RTNORM )  {   acedAlert("创建交叉选择集不成功!");  }  else  {   acedSSLength(SSName, &Number);   acedAlert("创建交叉选择集成功!");   while ( Number != 0 )   {    ptW0.x = t_ptW0;    ptW1.x = t_ptW1;
   t_ptW0 +=  210.0;    t_ptW1 +=  210.0;
   Number = 0;    acedSSFree(SSName);
   acedSSGet("C", t_ptW0, t_ptW1, NULL, SSName);    acedSSLength(SSName, &Number);   }  } 
 //--    绘制外框线  AcGePoint3d pt0(0, 0, 0), pt1(0, 297, 0), pt2(0, 0, 0), pt3(0, 0, 0);
 pt2.x = ptW1.x;  pt2.y = ptW1.y;  pt3.x = ptW1.x;  pt3.y = ptW0.y;
 CreateLine(pBlockTableRecord, pt0, pt1);  CreateLine(pBlockTableRecord, pt1, pt2);  CreateLine(pBlockTableRecord, pt2, pt3);  CreateLine(pBlockTableRecord, pt3, pt0);
 return true; }

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为什么已经切换当前数据库，acedSSGet还是对老的数据库操作？