【转帖】请各位帮忙
 

请各位帮忙
请各位帮忙
提示 用户选择两个点，将两点联成直线
为何不能实现啊 ，代码如下：
ads_point startpt, endpt;
acedgetpoint(null,"\nlocate start point : ", startpt);
acedgetpoint(null,"\nlocate end point : ", endpt);
acdbline *pline = new acdbline(startpt,endpt);
//error c2664: '__thiscall acdbline::acdbline(const class acgepoint3d &,const class acgepoint3d &)' : cannot convert parameter 1 from 'double [3]' to 'const class acgepoint3d &'
reason: cannot convert from 'double [3]' to 'const class acgepoint3d'
no constructor could take the source type, or constructor overload resolution was ambiguous
请各位帮忙指点一二
第一点，acdbline接受的不是ads_point而是acgepoint3d,要把ads_point 转换为acgepoint3d，可以这样写：
(假定 ads_point s;acgepoint3d p;)
p.set(s[0],s[1],s[2]);
但是你得程序可以有更快的写法：
acdbline *pline = new acdbline(*(acgepoint3d*)startpt,*(acgepoint3d*)endpt);
第二点，你必须把你的图元加入到数据库中才行，这个可以参考sdk上的写法：
acdbblocktable *pblocktable;
acdbhostapplicationservices()->workingdatabase()
->getsymboltable(pblocktable, acdb::kforread);
acdbblocktablerecord *pblocktablerecord;
pblocktable->getat(acdb_model_space, pblocktablerecord,
acdb::kforwrite);
pblocktable->close();
acdbobjectid lineid;
pblocktablerecord->appendacdbentity(lineid, pline);
pblocktablerecord->close();
pline->close();
我的qq 172522850