[求助]：关层有问题!

jjiangia

我用以下程序在acad 14中关掉层LayName:
AcDbLayerTable *pLayTbl;
acdbCurDwg()->getLayerTable(pLayTbl,AcDb::kForRead);
AcDbLayerTableRecord *pLayTblRcd;
pLayTbl->getAt(LayName,pLayTblRcd,AcDb::kForWrite);
pLayTblRcd->setIsOff(TRUE);
pLayTblRcd->close();
pLayTbl->close();

层LayName被关掉,但我在命令状态下输入Undo取消刚才的命令,结果层LayName仍不显示,至到我用一次layer命令层LayName才正常显示,请问是怎么回事?(在r2000以上版本没有此问题)

XDSoft

最初由 jjiangia 发布
[B]我用以下程序在acad 14中关掉层LayName:
AcDbLayerTable *pLayTbl;
acdbCurDwg()->getLayerTable(pLayTbl,AcDb::kForRead);
AcDbLayerTableRecord *pLayTblRcd;
pLayTbl->getAt(LayName,pLayTblRcd,AcDb::kForWr... [/B]

UNDO只有记录的UNDO信息的，才会恢复，对象修改后，调用下
assertWriteEnabled() ，参数给autoundo

1. <normalfont>
   
2. The assertWriteEnabled() function has the following signature:
   
3. 
   
4. void assertWriteEnabled(
   
5.     Adesk::Boolean autoUndo = Adesk::kTrue,
   
6.     Adesk::Boolean recordModified = Adesk::kTrue);
   
7. When a modification function calls assertWriteEnabled(), it first checks the value of the recordModified parameter.
   
8. If recordModified is kFalse, no undo recording is performed. If recordModified is kTrue,
   
9. it next checks the autoUndo parameter, which specifies whether an auto undo operation should be performed.
   
10. 
    
11. If autoUndo is kTrue (the default), the full object state is automatically written to the object's undo filer.
    
12. If you specify kFalse for autoUndo, no information is recorded. AutoCAD assumes that your modification
    
13. function will take care of recording the changed object state to the object's undo filer.
    
14. 
    
15. Even if you plan to implement a partial undo mechanism for your class, you can rely on automatic
    
16. undo in the first stages of development.
    
17. 
    
18. </normalfont>

复制代码

urgod

小东说的没错，可是跟楼主说的毫无干系

rave

最初由 urgod 发布
[B]小东说的没错，可是跟楼主说的毫无干系 [/B]

你认真读读，就会发现干系大大的有

jjiangia

我在pLayTblRcd->close()前加下pLayTblRcd->assertWriteEnabled(),仍然不行,是不是我用得不对?