学习C++ GUI Programming with Qt 4遇到的问题（1）

1.编译提示下面错误

说明：FindDialog是我写的QDialog的子类，findPrevious是FindDialog的signal

finddialog.cpp:(.text+0x567): undefined reference to `FindDialog::findPrevious(QString const&, Qt::CaseSensitivity)'

finddialog.cpp:(.text+0x591): undefined reference to `FindDialog::findNext(QString const&, Qt::CaseSensitivity)'

原因：在FindDialog的definition中没有Q_OBJECT

解决办法加入Q_OBJECT即可解决

2.编译提示下面错误

finddialog.o: In function `FindDialog::FindDialog(QWidget*)':

finddialog.cpp:(.text+0x27): undefined reference to `vtable for FindDialog'

finddialog.cpp:(.text+0x2f): undefined reference to `vtable for FindDialog'

finddialog.cpp:(.text+0x3b): undefined reference to `FindDialog::staticMetaObject'

finddialog.cpp:(.text+0xb5): undefined reference to `FindDialog::staticMetaObject'

finddialog.cpp:(.text+0xfe): undefined reference to `FindDialog::staticMetaObject'

finddialog.cpp:(.text+0x147): undefined reference to `FindDialog::staticMetaObject'

finddialog.cpp:(.text+0x190): undefined reference to `FindDialog::staticMetaObject'

finddialog.o:finddialog.cpp:(.text+0x36f): more undefined references to `FindDialog::staticMetaObject' follow

finddialog.o: In function `FindDialog::findClicked()':

finddialog.cpp:(.text+0x567): undefined reference to `FindDialog::findPrevious(QString const&, Qt::CaseSensitivity)'

finddialog.cpp:(.text+0x591): undefined reference to `FindDialog::findNext(QString const&, Qt::CaseSensitivity)'

原因：工程文件没有更新

解决办法：重新进行编译

qmake -project

qmake 工程名.pro

make