Qt metaObject链接器问题 [英] Qt metaObject linker problem

问题描述

在整合Qt与Vs，并试图编译.pro文件后，我得到以下错误：

 错误9错误LNK2001 ：未解析的外部符号public：virtual int __thiscall Multiplication_dialog :: qt_metacall（enum QMetaObject :: Call，int，void * *）（？qt_metacall @ Multiplication_dialog @@ UAEHW4Call @ QMetaObject @@ HPAPAX @ Z）
 
错误7错误LNK2001：未解析的外部符号public：virtual struct QMetaObject const * __thiscall Multiplication_dialog :: metaObject（void）const（？metaObject @ Multiplication_dialog @@ UBEPBUQMetaObject @@ XZ）
 
 
 Error 8 error LNK2001：未解析的外部符号public：virtual void * __thiscall Multiplication_dialog :: qt_metacast（char const *）（？qt_metacast @ Multiplication_dialog @@ UAEPAXPBD @ Z）
  / pre> 
 
 
如何处理这个问题？
解决方案
当你的项目中没有编译/链接foo.h（包含你的类标记为Q_OBJECT）的moc_foo.cpp时，得到这些错误。
 
 
 
在VS中工作
 
 
使用'qmake -tp vc'或
创建.vcproj文件
 
使用Qt Visual Studio加载项，它会自动处理所有的moc魔术（不能用于VC Express版本）。
 
 
使用加载项时，您可以通过
触发创建moc_foo.cpp 
 
 
 
 
确保对象的头文件
 
 
从Multiplication_dialog的头文件中删除所有出现的Q_OBJECT。
 $ b $  b 
保存文件
 
 
再次添加Q_OBJECT 
 
 
保存文件
 
 
 
 
 
现在您应该在解决方案资源管理器中的Generated Files文件夹中有两个版本的moc_multiplication_dialog.cpp。一个用于调试，一个用于释放。 
确保这些文件之一不从构建中排除。
 
After integrating Qt with Vs and trying to compile .pro file I'm getting following errors:   
Error   9   error LNK2001: unresolved external symbol "public: virtual int __thiscall Multiplication_dialog::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@Multiplication_dialog@@UAEHW4Call@QMetaObject@@HPAPAX@Z)     

Error   7   error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall Multiplication_dialog::metaObject(void)const " (?metaObject@Multiplication_dialog@@UBEPBUQMetaObject@@XZ)  


    Error   8   error LNK2001: unresolved external symbol "public: virtual void * __thiscall Multiplication_dialog::qt_metacast(char const *)" (?qt_metacast@Multiplication_dialog@@UAEPAXPBD@Z)    
What to do with this?
解决方案
You usally get these errors when the moc_foo.cpp for foo.h (which contains your class marked with Q_OBJECT) is not compiled / linked in your project.

To make a Qt project work in VS you either

Create a .vcproj file with 'qmake -tp vc' or
Use the Qt Visual Studio Add-in which handles all the moc magic automatically for you (doesn't work with VC Express versions though).
When using the add-in you can trigger the creation of the moc_foo.cpp by


Make sure the header file of the object in question appears in the VS project
List item
remove all occurrances of Q_OBJECT from the header file of Multiplication_dialog.
save the file
add Q_OBJECT again
save the file


Now you should have two versions of moc_multiplication_dialog.cpp in your "Generated Files" folder in the Solution Explorer. One for "Debug" and one for "Release".
Make sure that one of these files is not excluded from build.

                        
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