OOOOOOK, so now I find the answer..
ExtensionSize(lights)
This is the right way to know the size;
But why don't google write it out int its documentation???
在 2014年4月2日星期三UTC+8下午9时19分31秒，Zhiqian Yuan写道：
>
> Hi guys,
>
> I am blocked by this tricky issue. That is when I define a repeated
> string field in one extension, I find there's no way to know the size of
> that extension. For example:
>
> extend Truck {
> repeated string lights = 1001;
> };
>
> In this case, if you would like to get one "light" string out from the
> extension, you can surely call obj->GetExtension(lights, index); In this
> way you may get the string stored at the position that index indicates;
> however, there should be a way to know the total number of this field
> anyway, otherwise you won't know where to stop, right?
>
> Now this is the problem! There's simply no such a way for us to know the
> size of "lights".
>
> I have no idea, I checked the documentation and read the code. But I
> haven't found any clue. Could anyone please help me? I appreciate a lot for
> any clue you guys would share :)
>
> Regards
> Zhiqian
>
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