[ARX 程序]：长事务处理一例，摘自某书示例

bobofu

2. 
   
3. #include <rxregsvc.h>
   
4. #include <aced.h>
   
5. 
   
6. #include <dbidmap.h>
   
7. #include <lngtrans.h>
   
8. #include <dbltrans.h>
   
9. 
   
10. #include <dbmain.h>
    
11. #include <dbsymtb.h>
    
12. #include <dbents.h>
    
13. #include <dbapserv.h>
    
14. #include <adslib.h>
    
15. 
    
16. void
    
17. refEdit()
    
18. {
    
19. 
    
20.     AcDbObjectId transId;
    
21.     AcDbDatabase* pDb;
    
22.     char *fname;
    
23.     struct resbuf *rb;
    
24. 
    
25.     rb = acutNewRb(RTSTR);
    
26.     int stat = acedGetFileD("Pick a drawing", NULL, "dwg", 0, rb);
    
27.    
    
28.     if ((stat != RTNORM) || (rb == NULL))
    
29.         {
    
30.         acutPrintf("\nYou must pick a drawing file.");
    
31.         return;
    
32.     }
    
33. 
    
34.     fname = (char*)acad_malloc(strlen(rb->resval.rstring) + 1);
    
35.     strcpy(fname, rb->resval.rstring);
    
36.     acutRelRb(rb);
    
37.    
    
38.     pDb = new AcDbDatabase(Adesk::kFalse);
    
39.     if (pDb->readDwgFile(fname) != Acad::eOk)
    
40.         {
    
41.         acutPrintf("\nSorry, that draing is probably already open.");
    
42.         return;
    
43.     }
    
44. 
    
45.     AcDbBlockTable *pBlockTable;
    
46.     pDb->getSymbolTable(pBlockTable, AcDb::kForRead);
    
47.     AcDbBlockTableRecord *pOtherMsBtr;
    
48.     pBlockTable->getAt(ACDB_MODEL_SPACE, pOtherMsBtr, AcDb::kForRead);
    
49.     pBlockTable->close();
    
50. 
    
51.     AcDbBlockTableRecordIterator *pIter;
    
52.     pOtherMsBtr->newIterator(pIter);
    
53. 
    
54.     AcDbObjectIdArray objIdArray;
    
55. 
    
56.     for (pIter->start(); !pIter->done(); pIter->step()) {
    
57.         AcDbEntity *pEntity;
    
58.         pIter->getEntity(pEntity, AcDb::kForRead);
    
59. 
    
60.         if (pEntity->isKindOf(AcDbCircle::desc())) {
    
61.             objIdArray.append(pEntity->objectId());
    
62.         }
    
63.         pEntity->close();
    
64.     }
    
65.     delete pIter;
    
66.     pOtherMsBtr->close();
    
67. 
    
68.     if (objIdArray.isEmpty()) {
    
69.         acad_free(fname);
    
70.         acutPrintf("\nYou must pick a drawing file that contains circles.");
    
71.         return;
    
72.     }
    
73. 
    
74.     AcDbBlockTable *pThisBlockTable;
    
75.     acdbHostApplicationServices()->workingDatabase()
    
76.         ->getSymbolTable(pThisBlockTable, AcDb::kForRead);
    
77. 
    
78.     AcDbBlockTableRecord *pThisMsBtr;
    
79.     pThisBlockTable->getAt(ACDB_MODEL_SPACE, pThisMsBtr, AcDb::kForWrite);
    
80.     pThisBlockTable->close();
    
81.    
    
82.     AcDbObjectId id = pThisMsBtr->objectId();
    
83.     pThisMsBtr->close();
    
84. 
    
85. 
    
86.     AcDbIdMapping errorMap;
    
87.     acapLongTransactionManagerPtr()->checkOut(transId, objIdArray, id, errorMap);
    
88. 
    
89.     int colorIndex;
    
90.         double radius;
    
91.     acedGetInt("\nEnter color number to circles center line: ", &colorIndex);
    
92.         acedGetReal("\nEnter circle radius: ",&radius);
    
93.         if (radius<=0)
    
94.         {
    
95.                 acutPrintf("\nError:Radius can't less than 0!");
    
96.                 return;
    
97.         }
    
98.     AcDbObject* pObj;
    
99.     if (acdbOpenObject(pObj, transId, AcDb::kForRead) == Acad::eOk)
    
100.         {
     
101. 
     
102.         AcDbLongTransaction* pLongTrans = AcDbLongTransaction::cast(pObj);
     
103.         if (pLongTrans != NULL)
     
104.                 {
     
105. 
     
106.             AcDbLongTransWorkSetIterator* pWorkSetIter;
     
107.             pLongTrans->newWorkSetIterator(pWorkSetIter);
     
108. 
     
109.             for (pWorkSetIter->start(); !pWorkSetIter->done(); pWorkSetIter->step())
     
110.                         {
     
111.                 AcDbEntity *pEntity;
     
112.                 acdbOpenAcDbEntity(pEntity, pWorkSetIter->objectId(), AcDb::kForWrite);
     
113.                             pEntity->setColorIndex(colorIndex);
     
114.                                 ((AcDbCircle*)pEntity)->setRadius(radius);
     
115.                 pEntity->close();
     
116.             }
     
117.             delete pWorkSetIter;
     
118.         }
     
119.         pObj->close();
     
120.     }
     
121. 
     
122.     char str[132];
     
123.     acedGetString(0, "\nSee the new colors and radius. Press return to back", str);
     
124. 
     
125.     acapLongTransactionManagerPtr()->checkIn(transId, errorMap);
     
126. 
     
127.     pDb->saveAs(fname);
     
128. 
     
129.     delete pDb;
     
130.     pDb = NULL;
     
131. 
     
132.     acad_free(fname);
     
133. }
     
134. 
     
135. void
     
136. initApp()
     
137. {
     
138. 
     
139.     acedRegCmds->addCommand("EXAM04A",
     
140.                 "LONGTRANS",
     
141.                 "LONGTRANS",
     
142.                 ACRX_CMD_MODAL,
     
143.                 refEdit);
     
144. 
     
145. }
     
146. 
     
147. 
     
148. void unloadApp()
     
149. {
     
150.     acedRegCmds->removeGroup("EXAM04A");
     
151. 
     
152. }
     
153. 
     
154. extern "C" AcRx::AppRetCode
     
155. acrxEntryPoint(AcRx::AppMsgCode msg, void* appId)
     
156. {
     
157.     switch (msg) {
     
158.     case AcRx::kInitAppMsg:
     
159.         acrxDynamicLinker->unlockApplication(appId);
     
160.         acrxDynamicLinker->registerAppMDIAware(appId);
     
161.         initApp();
     
162.         break;
     
163.     case AcRx::kUnloadAppMsg:
     
164.         unloadApp();
     
165.         break;
     
166.     case AcRx::kLoadDwgMsg:
     
167. 
     
168.         break;
     
169.     case AcRx::kUnloadDwgMsg:
     
170. 
     
171.         break;
     
172.     case AcRx::kInvkSubrMsg:
     
173. 
     
174.         break;
     
175.     default:
     
176.         ;
     
177.     }
     
178.     return AcRx::kRetOK;
     
179. }
     

<br /> #include <rxregsvc.h><br /> #include <aced.h><br /> <br /> #include <dbidmap.h><br /> #include <lngtrans.h><br /> #include <dbltrans.h><br /> <br /> #include <dbmain.h><br /> #include <dbsymtb.h><br /> #include <dbents.h><br /> #include <dbapserv.h><br /> #include <adslib.h><br /> <br /> void<br /> refEdit()<br /> {<br /> <br />     AcDbObjectId transId;<br />     AcDbDatabase* pDb;<br />     char *fname;<br />     struct resbuf *rb;<br /> <br />     rb = acutNewRb(RTSTR);<br />     int stat = acedGetFileD("Pick a drawing", NULL, "dwg", 0, rb);<br />     <br />     if ((stat != RTNORM) || (rb == NULL)) <br />         {<br />         acutPrintf("\nYou must pick a drawing file.");<br />         return;<br />     }<br /> <br />     fname = (char*)acad_malloc(strlen(rb->resval.rstring) + 1);<br />     strcpy(fname, rb->resval.rstring);<br />     acutRelRb(rb);<br />     <br />     pDb = new AcDbDatabase(Adesk::kFalse);<br />     if (pDb->readDwgFile(fname) != Acad::eOk) <br />         {<br />         acutPrintf("\nSorry, that draing is probably already open.");<br />         return;<br />     }<br /> <br />     AcDbBlockTable *pBlockTable;<br />     pDb->getSymbolTable(pBlockTable, AcDb::kForRead);<br />     AcDbBlockTableRecord *pOtherMsBtr;<br />     pBlockTable->getAt(ACDB_MODEL_SPACE, pOtherMsBtr, AcDb::kForRead);<br />     pBlockTable->close();<br /> <br />     AcDbBlockTableRecordIterator *pIter;<br />     pOtherMsBtr->newIterator(pIter);<br /> <br />     AcDbObjectIdArray objIdArray;<br /> <br />     for (pIter->start(); !pIter->done(); pIter->step()) {<br />         AcDbEntity *pEntity;<br />         pIter->getEntity(pEntity, AcDb::kForRead);<br /> <br />         if (pEntity->isKindOf(AcDbCircle::desc())) {<br />             objIdArray.append(pEntity->objectId());<br />         }<br />         pEntity->close();<br />     }<br />     delete pIter;<br />     pOtherMsBtr->close();<br /> <br />     if (objIdArray.isEmpty()) {<br />         acad_free(fname);<br />         acutPrintf("\nYou must pick a drawing file that contains circles.");<br />         return;<br />     }<br /> <br />     AcDbBlockTable *pThisBlockTable;<br />     acdbHostApplicationServices()->workingDatabase()<br />         ->getSymbolTable(pThisBlockTable, AcDb::kForRead);<br /> <br />     AcDbBlockTableRecord *pThisMsBtr;<br />     pThisBlockTable->getAt(ACDB_MODEL_SPACE, pThisMsBtr, AcDb::kForWrite);<br />     pThisBlockTable->close();<br />     <br />     AcDbObjectId id = pThisMsBtr->objectId();<br />     pThisMsBtr->close();<br /> <br /> <br />     AcDbIdMapping errorMap;<br />     acapLongTransactionManagerPtr()->checkOut(transId, objIdArray, id, errorMap);<br /> <br />     int colorIndex;<br />         double radius;<br />     acedGetInt("\nEnter color number to circles center line: ", &colorIndex);<br />         acedGetReal("\nEnter circle radius: ",&radius);<br />         if (radius<=0)<br />         {<br />                 acutPrintf("\nError:Radius can't less than 0!");<br />                 return;<br />         }<br />     AcDbObject* pObj;<br />     if (acdbOpenObject(pObj, transId, AcDb::kForRead) == Acad::eOk) <br />         {<br /> <br />         AcDbLongTransaction* pLongTrans = AcDbLongTransaction::cast(pObj);<br />         if (pLongTrans != NULL) <br />                 {<br /> <br />             AcDbLongTransWorkSetIterator* pWorkSetIter;<br />             pLongTrans->newWorkSetIterator(pWorkSetIter);<br /> <br />             for (pWorkSetIter->start(); !pWorkSetIter->done(); pWorkSetIter->step()) <br />                         {<br />                 AcDbEntity *pEntity;<br />                 acdbOpenAcDbEntity(pEntity, pWorkSetIter->objectId(), AcDb::kForWrite);<br />                             pEntity->setColorIndex(colorIndex);<br />                                 ((AcDbCircle*)pEntity)->setRadius(radius);<br />                 pEntity->close();<br />             }<br />             delete pWorkSetIter;<br />         }<br />         pObj->close();<br />     }<br /> <br />     char str[132];<br />     acedGetString(0, "\nSee the new colors and radius. Press return to back", str);<br /> <br />     acapLongTransactionManagerPtr()->checkIn(transId, errorMap);<br /> <br />     pDb->saveAs(fname);<br /> <br />     delete pDb;<br />     pDb = NULL;<br /> <br />     acad_free(fname);<br /> }<br /> <br /> void<br /> initApp()<br /> {<br /> <br />     acedRegCmds->addCommand("EXAM04A", <br />                 "LONGTRANS", <br />                 "LONGTRANS", <br />                 ACRX_CMD_MODAL, <br />                 refEdit);<br /> <br /> }<br /> <br /> <br /> void unloadApp()<br /> {<br />     acedRegCmds->removeGroup("EXAM04A");<br /> <br /> }<br /> <br /> extern "C" AcRx::AppRetCode <br /> acrxEntryPoint(AcRx::AppMsgCode msg, void* appId)<br /> {<br />     switch (msg) {<br />     case AcRx::kInitAppMsg:<br />         acrxDynamicLinker->unlockApplication(appId);<br />         acrxDynamicLinker->registerAppMDIAware(appId);<br />         initApp();<br />         break;<br />     case AcRx::kUnloadAppMsg:<br />         unloadApp();<br />         break;<br />     case AcRx::kLoadDwgMsg:<br /> <br />         break;<br />     case AcRx::kUnloadDwgMsg:<br /> <br />         break;<br />     case AcRx::kInvkSubrMsg:<br /> <br />         break;<br />     default:<br />         ;<br />     }<br />     return AcRx::kRetOK;<br /> }<br />

why1025

啥是长事物，干什么用的，谁能解释下