[每日一码] ARX实例代码--获得XREF的路径而不管是否在图中保存

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1. Acad::ErrorStatus getXrefPath( AcDbObjectId pId, const char *&pName )
2. {
3.     AcDbObject *pObj,*pRecObj;
4.     AcDbBlockReference *pBlkRef;
5.     AcDbObjectId pBTRId;
6.     AcDbBlockTableRecord* pRec;
7.     Acad::ErrorStatus es;
9.     //    open entiry
10.     es = acdbOpenObject(pObj, pId, AcDb::kForRead);
11.     assert(es == Acad::eOk);
13.     if(pObj->isKindOf(AcDbBlockReference::desc()))    // Is it a blockreference?
14.     {
15.         pBlkRef = AcDbBlockReference::cast(pObj);
16.         assert( pBlkRef );
18.         // get ID of the block table record that pObj referenced.
19.         pBTRId = pBlkRef->blockTableRecord();
20.         pObj->close();
22.         // open the block table record that pObj referenced.
23.         es = acdbOpenObject(pRecObj, pBTRId, AcDb::kForRead);
24.         assert(es == Acad::eOk);
26.         if(pRecObj->isKindOf(AcDbBlockTableRecord::desc())) // Is it a block table record?
27.         {
28.             pRec = AcDbBlockTableRecord::cast(pRecObj);
29.             assert( pRec );
31.             if( pRec->isFromExternalReference() )    // Is it a XREF?
32.             {
33. // The following lines apply to all conditions, retaining path information or not
34.                 pName =pRec->xrefDatabase(true)->originalFileName();
36. //    The following line just apply to XREF retaining the path information when inserted
37. //                pRec->pathName(pName);    // get path name if retained when insert
39.                 if(pName)
40.                     es = Acad::eOk;
41.                 else
42.                     es = Acad::eInvalidInput;
43.             }
44.             else
45.                 es = Acad::eInvalidInput;
46.         }
47.         else
48.             es = Acad::eInvalidInput;
49.     }
50.     else
51.     {
52.         pObj->close();
53.         es = Acad::eInvalidInput;
54.     }
56.     pRecObj->close();    // close XREF object
57.     return es;
58. }
60. //Please bear in mind that the above code will retrieve the path name of the copied drawing instead of the original drawing if XLOADCTL is set to 2.

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