Q_OBJECT链接器错误！ [英] Q_OBJECT linker error!

问题描述

我在建立我的应用程式时收到以下连结程式错误。

I am receiving the following linker error when I build my application.

HIMyClass.obj :: error：
unresolved外部符号public：
virtual struct QMetaObject const *
__thiscall CHIMyClass :: metaObject（void）const

（？metaObject @ CHIMyClass @@ UBEPBUQMetaObject @@ XZ）
文件未找到：HIMyClass.obj

HIMyClass.obj:: error: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall CHIMyClass::metaObject(void)const " (?metaObject@CHIMyClass@@UBEPBUQMetaObject@@XZ) File not found : HIMyClass.obj

HIMyClass.obj ::错误：
未解析的外部符号public：
virtual void * __thiscall
CHIMyClass :: qt_metacast（char
const *）
（？qt_metacast @ CHIMyClass @@ UAEPAXPBD @ Z）找不到文件：HIMyClass.obj

HIMyClass.obj:: error: unresolved external symbol "public: virtual void * __thiscall CHIMyClass::qt_metacast(char const *)" (?qt_metacast@CHIMyClass@@UAEPAXPBD@Z) File not found : HIMyClass.obj

HIMyClass.obj :: error：
unresolved external symbolpublic：
virtual int __thiscall
CHIMyClass :: qt_metacall（enum
QMetaObject :: Call，int，void * *）
（？qt_metacall @ CHIMyClass @@ UAEHW4Call @ QMetaObject @@ HPAPAX @ Z）找不到文件：HIMyClass.obj

HIMyClass.obj:: error: unresolved external symbol "public: virtual int __thiscall CHIMyClass::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@CHIMyClass@@UAEHW4Call@QMetaObject@@HPAPAX@Z) File not found : HIMyClass.obj

我的类声明是

class CHIMyClass:public QDialog
{
   Q_OBJECT

   ....

};

当我注释Q_OBJECT链接器错误关闭（，显然我不能使用信号和插槽）。我使用Qt Creator作为IDE和Qt 4.5.3。当我给重建全部时，确定将调用 QMake 。我想，它的moc_ *文件的生成是问题所在。我使用Windows XP和cl作为编译器。

When I comment Q_OBJECT the linker error goes off (and obviously I am not able to use signals and slots). I am using Qt Creator as IDE and Qt 4.5.3. When I give Rebuild All it's definite that QMake will be called. I guess that, its the generation of moc_* files is where the problem lies. I am using Windows XP and cl as the compiler.

这个链接器错误背后的原因是什么？

What might be the reason behind this linker error?

推荐答案

这样的错误通常意味着你没有添加你的类的头到HEADERS变量在pro文件（元对象编译器生成moc_文件只为此变量列出的头）。记住在更改.pro file！

Such errors usually mean that you haven't added the header of your class to "HEADERS" variable in pro file (meta object compiler generates moc_ files only for headers listed in this variable). Remember to run qmake after you change .pro file!

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