有一篇类似的文章是这样的:> ///////////// VisInterface.h> class VisInterface> {> public:> virtual QList<VisFactory*> visualizations()const=0;> };> Q_DECLARE_INTERFACE(VisInterface, "flt.VisInterface")> ///////////// End VisInterface.h>> ///////////// 3DVisPlugin.h> class C3DVisPlugin : public QObject,public VisInterface> {> Q_OBJECT> Q_INTERFACES(VisInterface)> public:> virtual QList<VisFactory*> visualizations()const;> };> ///////////// End 3DVisPlugin.h>> I get the following two warning/errors when I try to moc the files:> MOC VisInterFace.h> VisInterFace.h(0): Warning: No relevant classes found. No output generated.>> MOC 3DVisPlugin.h> 3DVisPlugin.h(12): Error: Undefined interface>> I'd greatly apppreciate any help on fixing/sidestepping this problemYou don't need to run moc on VisInterface.h, but when moc'ing 3DVisPlugin.h you need to make sure to pass the -I option with an include path that makes it possible for moc to find VisInterface.h as you #include it in 3DVisPlugin.h.这个怎么理解啊?要哪个文件找到哪个文件?