[每日一码] 如何通过程序创建一个多线样式（AcDbMlineStyle）

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1. // minimal error checking for code brevity
2. void createMlineStyle()
3. {
4.     AcDbLinetypeTable* pTable = NULL;  
5. AcDbObjectId id;   
6. AcDbDatabase* pDb = curDoc()->database();
7. // open ByLayer linetypetablerecord for use in MLineStyle later
8. pDb->getLinetypeTable(pTable, AcDb::kForRead);
9. if((pTable->getAt(L"ByLayer", id)) != Acad::eOk)
10. {
11.     acutPrintf(L"\nlinetype ByLayer not found.");   
12.     return;   
13. }
14. pTable->close();
16.     AcDbDictionary* pDict = NULL;
17. // open MLStyleDictionary (its sored in the NOD)  
18. Acad::ErrorStatus es = pDb->getMLStyleDictionary(pDict, AcDb::kForRead);
19. if(es != Acad::eOk)   
20. {     
21.   acutPrintf(L"\nCan't open mline style dictionary for read.");  
22.   return;   
23. }  
24. const ACHAR mlineStyleName[] = L"test";
25. AcDbMlineStyle* ps = NULL;
26. // does MLStyle "test" already exist?
27. es = pDict->getAt(mlineStyleName, (AcDbObject*&)ps, AcDb::kForWrite);
28. // If it doesn't exist, create it  
29. if(es != Acad::eOk)  
30. {      
31.   ps = new AcDbMlineStyle;      
32.   AcDbObjectId mId;  
33.   ps->initMlineStyle();  
34.   pDict->upgradeOpen();   
35.   pDict->setAt(mlineStyleName, ps, mId);
36. }   
37. pDict->close();
38.     // set MLStyle attributes and elements   
39. es = ps->setName(mlineStyleName);
40. AcCmColor cm;     cm.setColorIndex(256);
41.     int a=0, b=0;   
42. es = ps->addElement(a, -0.25, cm, id);  
43. assert(es == Acad::eOk);  
44. es = ps->addElement(b, 0.25, cm, id);
45.     assert(es == Acad::eOk);  
46. ps->close();
47. acutPrintf(L"\nMline style: %s created.", mlineStyleName);
48. }

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