使用了Q_OBJECT宏之后在编译的时候会遇到下面的错误：
--------------------Configuration: testqt - Win32 Debug--------------------
Linking...
test.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall MyMainWindow::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@MyMainWindow@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
test.obj : error LNK2001: unresolved external symbol "public: virtual void * __thiscall MyMainWindow::qt_metacast(char const *)" (?qt_metacast@MyMainWindow@@UAEPAXPBD@Z)
test.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall MyMainWindow::metaObject(void)const " (?metaObject@MyMainWindow@@UBEPBUQMetaObject@@XZ)
debug/testqt.exe : fatal error LNK1120: 3 unresolved externals
Error executing link.exe.
testqt.exe - 4 error(s), 0 warning(s)
LINK2001的错误就是找不到函数的实现。
在文件末尾加入：#include "test.moc"
*.moc qmake生成的moc文件。
有关moc的东西请参考：