Qt-interest Archive, May 2007
When should I choose “-nometaobject” in Qt\4.3.0beta\bin\dumpcpp ?
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When should I choose “-nometaobject” in Qt\4.3.0beta\bin\dumpcpp ?
(This question is not limited to this version only.)
Qt doc says: “-nometaobject : Do not generate a .cpp file with the meta
object information. The meta object is then generated in runtime.”
In my practice, if dumpcpp without “-nometaobject” I got link error:
error LNK2001: unresolved external symbol "public: virtual void *
__thiscall rptaxLib::ITwoImagesWidget::qt_metacast(char const *)
This error was triggered by a handler declared for an interface:
rptaxLib::ITwoImagesWidget iobj(iDispatch);
where, rptaxLib is a namespace, and ITwoImagesWidget can be found in the
machine-generated wrapper.
However, with “-nometaobject” , no error, and an exe was created, but
the iobj didn’t seem working well in runtime.
“not work well” means loose dynamic call. If, for example, make a call:
iobj.dynamicCall("setNames(QStringList)", params);
The QAxBase::dynamicCallHelper will say “No such property” in Debug
window.
So question is when should I choose “-nometaobject” ?
Thanks in advance,
Lingfa
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