将组添加到组字典

下面的代码从 andfunctions 中创建的行和圆中创建一组 （），并将该组放入 GROUP 字典中。线和圆的对象 ID 将传递到函数中。请注意如何打开 GROUP 字典进行写入、修改，然后显式关闭。pGroupcreateLine()createCircle()

void
createGroup(AcDbObjectIdArray& objIds, char* pGroupName)
{
    AcDbGroup *pGroup = new AcDbGroup(pGroupName);
    // Put the group in the group dictionary which resides
    // in the named object dictionary.
    //
    AcDbDictionary *pGroupDict;
    acdbHostApplicationServices()->workingDatabase()
        ->getGroupDictionary(pGroupDict, AcDb::kForWrite);
    AcDbObjectId pGroupId;
    pGroupDict->setAt(pGroupName, pGroup, pGroupId);
    pGroupDict->close();
    // Now that the group has been added, it has an ObjectID.
    // This is important since the group will become a persistent
    // reactor for the added entities...
    for (int i = 0; i < objIds.length(); i++) {
        pGroup->append(objIds[i]);
        }
    pGroup->close();
}