qfilesystemwatcher未解决的外部

QFileSystemWatcher unresolved external

本文关键字：外部 未解决 qfilesystemwatcher      更新时间：2023-10-16

我在此示例之后，我会摆弄QFileSystemWatcher。但是，当编译时，我会得到未解决的外部符号错误。这是我的代码：

#include <QCoreApplication>
#include <QFileSystemWatcher>
#include <QObject>
#include <iostream>
class MyClass : public QObject
{
    Q_OBJECT
public:
    MyClass(QObject* parent = nullptr) : QObject(parent){}
public slots:
    void on_dir_change(const QString& path)
    {
        std::cout << "folder modified: (" << path.toStdString() << ")" << 
std::endl;
    }
};
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QFileSystemWatcher watcher;
    watcher.addPath("C:/test");
    MyClass* mc = new MyClass();
    QObject::connect(&watcher, SIGNAL(directoryChanged(QString)), mc, 
SLOT(on_dir_change(QString)));
    return a.exec();
}

在编译时会产生以下错误消息：

main.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl MyClass::metaObject(void)const " (?metaObject@MyClass@@UEBAPEBUQMetaObject@@XZ)

main.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl MyClass::qt_metacast(char const *)" (?qt_metacast@MyClass@@UEAAPEAXPEBD@Z)

main.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl MyClass::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@MyClass@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)

debugFileSystemWatcherTest.exe : fatal error LNK1120: 3 unresolved externals

我在做什么错？

尝试将MyClass定义放在单独的.h文件

中
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