Error message in QThread

[marc2050]

Hi.

I did a clean and rebuild. I also make sure I've Q_Object macro in mythread.
Now I got the following errors. Before I added Q_Object, I've only the LNK2019 error.
Also, can you confirm that even for custom signals like the earlier author Rachol replied,
that I still do not need to provide implementation of the valueChanged function?
If so, how do I resolve these metaobject error below?

Please help. I'm losing my hair over this and cant move on.

mythread.obj:-1: error: LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall mythread::metaObject(void)const " (?metaObject@mythread@@UBEPBUQMetaObject@@XZ)
mythread.obj:-1: error: LNK2001: unresolved external symbol "public: virtual void * __thiscall mythread::qt_metacast(char const *)" (?qt_metacast@mythread@@UAEPAXPBD@Z)
mythread.obj:-1: error: LNK2001: unresolved external symbol "public: virtual int __thiscall mythread::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@mythread@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
mythread.obj:-1: error: LNK2019: unresolved external symbol "protected: void __thiscall mythread::valueChanged(int)" (?valueChanged@mythread@@IAEXH@Z) referenced in function "public: void __thiscall mythread::init(void)" (?init@mythread@@QAEXXZ)
mythread.obj:-1: error: LNK2001: unresolved external symbol "public: static struct QMetaObject const mythread::staticMetaObject" (?staticMetaObject@mythread@@2UQMetaObject@@B)

mythread.obj:-1: error: LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall mythread::metaObject(void)const " (?metaObject@mythread@@UBEPBUQMetaObject@@XZ)
mythread.obj:-1: error: LNK2001: unresolved external symbol "public: virtual void * __thiscall mythread::qt_metacast(char const *)" (?qt_metacast@mythread@@UAEPAXPBD@Z)
mythread.obj:-1: error: LNK2001: unresolved external symbol "public: virtual int __thiscall mythread::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@mythread@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
mythread.obj:-1: error: LNK2019: unresolved external symbol "protected: void __thiscall mythread::valueChanged(int)" (?valueChanged@mythread@@IAEXH@Z) referenced in function "public: void __thiscall mythread::init(void)" (?init@mythread@@QAEXXZ)
mythread.obj:-1: error: LNK2001: unresolved external symbol "public: static struct QMetaObject const mythread::staticMetaObject" (?staticMetaObject@mythread@@2UQMetaObject@@B)

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[stampede]

You do not provide implementation of any signals, because moc will do that. You need to implement slots if you have any.
This looks like moc code is not compiled, how do you build your project ? If you have a .pro file, post it here. Show the header too, maybe you have some obvious errors, typos etc.

[marc2050]

Hi.
Below is my .pro file.
I'm using QT creator as my IDE.
Yes. I've implemented my slots.
I think you're right. I'm missing the moc codes.
So, how do I ask QT creator to build moc codes?

#-------------------------------------------------
#
# Project created by QtCreator 2011-04-25T10:51:02
#
#-------------------------------------------------
 
QT       += core gui
 
TARGET = mylittleProgram
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp \
    mylittleheader.cpp \
    mylittlerender.cpp \
    mylittlereaddata.cpp \
    mythread.cpp
 
HEADERS  += mainwindow.h \
    mylittleheader.h \
    mylittlerender.h \
    mylittlereaddata.h \
    mythread.h
 
 
FORMS    += mainwindow.ui

#-------------------------------------------------
#
# Project created by QtCreator 2011-04-25T10:51:02
#
#-------------------------------------------------

QT       += core gui

TARGET = mylittleProgram
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp \
    mylittleheader.cpp \
    mylittlerender.cpp \
    mylittlereaddata.cpp \
    mythread.cpp

HEADERS  += mainwindow.h \
    mylittleheader.h \
    mylittlerender.h \
    mylittlereaddata.h \
    mythread.h


FORMS    += mainwindow.ui

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[stampede]

It should do it automatically.
.pro file looks ok, so I'd start by running qmake and check if Makefiles contains correct moc build targets.