【转帖】acdbobject::upgradeopen()出现的问题！
 

acdbobject::upgradeopen()出现的问题！
acdbobject::upgradeopen()出现的问题！
当用acdbobject::upgradeopen()将一个层表记录改为 kforwrite时，提示acad::ehadmultiplereaders,无法改变其读写的状态
只有用->close()函数关闭层表记录，再执行upgradeopen() ，操作成功。
是不是运用upgradeopen() 前必须关闭对象呢？
但是我在另外一个工程中却没有这样的问题，不解！请高手指教，呵呵。。。
silence of happiness....
acad::errorstatus
upgradeopen();
if the object is currently open acdb::kforread with only one reader, then this function upgrades the object to open acdb::kforwrite. in the process of changing to open for write, the object is closed, thus triggering any pertinent notification.
returns acad::eok if successful. if the object has more than one reader, then the open status is not changed and adesk::ehadmultiplereaders is returned. if the object is already open acdb::kforwrite, then acad::ewasopenforwrite is returned. if the object is currently sending notification, then the open status is not changed and acad::ewasnotifying is returned.
note a call of this function does not need to be matched with a call to downgradeopen(), since a call to close() or cancel() will sufficiently cleanup the entity抯 open state.
注意这个函数中的说明 if the object has more than one reader, then the open status is not changed and adesk::ehadmultiplereaders is returned
江苏昆山小城，欢迎交流
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没有啊，层表记录只有在获得层表记录时以kforread模式打开的，然后马上用upgradeopen()函数将其改为kforwrite状态。应该是没有问题的。
还有一个问题是：同是这个程序，放在另外一个工程中并没有这样的问题，百思不得其解。
silence of happiness....
不好意思，我是现在还是菜鸟，还有很多的问题不懂呢....
望有达人们来解决吧
江苏昆山小城，欢迎交流
本职工作五金模具设计及加工
及ｃａｄ软件开发
我还未为达人，建议看看帮助文件