arx DynamicBlock 有一个 “Visibility” 属性

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1. void SetDynamicBlkProperty()
3. {
5. ads_name ename;
7. ads_point pt;
9. if(acedEntSel(L"\nSelect a dynamic block reference: ", ename, pt) != RTNORM)
11. {
13.   acutPrintf(L"\nError selecting entity.");
15.   return;
17. }
21. AcDbObjectId eId;
23. acdbGetObjectId(eId, ename);
25. AcDbEntity* pEnt = NULL;
29. if (acdbOpenObject(pEnt, eId , AcDb::kForRead) != Acad::eOk)
31. {
33.   acutPrintf(L"\nError opening entity.");
35.   if(pEnt)
37.     pEnt->close();
39.   return;
41. }
45. if(pEnt->isA() != AcDbBlockReference::desc())
47. {
49.   acutPrintf(L"\nMust select a block insert.");
51.   pEnt->close();
53.   return;
55. }
59. AcDbBlockReference *pBlkRef = AcDbBlockReference::cast(pEnt);
63. // initialise a AcDbDynBlockReference from the object id of the blockreference
65. AcDbDynBlockReference* pDynBlkRef = new AcDbDynBlockReference(pBlkRef->objectId());
69. //Don't forget to close the blockreference here,
71. //otherwise you wont be able to modify properties
73. pEnt->close();
77. if (pDynBlkRef)
79. {
81.   AcDbDynBlockReferencePropertyArray blkPropAry;
83.   pDynBlkRef->getBlockProperties(blkPropAry);
87.   Acad::ErrorStatus err;
89.   AcDbDynBlockReferenceProperty blkProp;
93.   for(long lIndex1=0L ; lIndex1<blkPropAry.length() ; ++lIndex1)
95.   {
97.    blkProp = blkPropAry[lIndex1];
101.    //look for the relevant property
103.    if (wcscmp(blkProp.propertyName().kACharPtr(), L"Visibility") != 0) continue;
107.    //Get allowed values for property
109.    AcDbEvalVariantArray evalAry;
113.    if ((err = blkProp.getAllowedValues(evalAry)) == Acad::eOk )
115.    {
117.     if( evalAry.length() >= 1)
119.     {
121.      AcDbEvalVariant eval = evalAry[1];
125.      if(!blkProp.readOnly())
127.      {
129.       if((err = blkProp.setValue(eval)) != Acad::eOk)
131.       {
133.        acutPrintf(L"\nError setting property value...");
135.       }
137.      }
139.     }
141.    }
143.   }
147.   //Don't forget to delete this reference, otherwise you will have problems.
149.   delete pDynBlkRef;
151. }
153. }
157. Here is the C# version:
159. [CommandMethod("SetDynamicBlkProperty")]
161. static public void SetDynamicBlkProperty()
163. {
165.     Document doc = Application.DocumentManager.MdiActiveDocument;
167.     Database db = doc.Database;
169.     Editor ed = doc.Editor;
173.     PromptEntityOptions prEntOptions = new PromptEntityOptions(
175.         "Select a dynamic block reference...");
179.     PromptEntityResult prEntResult = ed.GetEntity(prEntOptions);
183.     if (prEntResult.Status != PromptStatus.OK)
185.     {
187.         ed.WriteMessage("Error...");
189.         return;
191.     }
195.     using(Transaction Tx = db.TransactionManager.StartTransaction())
197.     {
199.         BlockReference bref = Tx.GetObject(
201.             prEntResult.ObjectId,
203.             OpenMode.ForWrite)
205.                 as BlockReference;
209.         if (bref.IsDynamicBlock)
211.         {
213.             DynamicBlockReferencePropertyCollection props =
215.                 bref.DynamicBlockReferencePropertyCollection;
219.             foreach (DynamicBlockReferenceProperty prop in props)
221.             {
223.                 object[] values = prop.GetAllowedValues();
227.                 //Switch Property
229.                 if (prop.PropertyName == "Visibility" && !prop.ReadOnly)
231.                 {
233.                     if (prop.Value.ToString() == values[0].ToString())
235.                         prop.Value = values[1];
239.                     else
241.                         prop.Value = values[0];
243.                 }
245.             }
247.         }
251.         Tx.Commit();
253.     }
255. }

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