Qt错误 error: collect2: ld returned 1 exit status求解答，以贴源代码

C/C++ code

#include<QThread>#include<QCoreApplication>#include<iostream>using namespace std;class MyThread : public QThread {     Q_OBJECT  public:     MyThread();     ~MyThread();  protected:     void    run()     {         cout << "I run the thread" <<endl;     } };MyThread::MyThread(){}MyThread::~MyThread(){}int main(int argc, char *argv[]) {     QCoreApplication a(argc, argv);     MyThread myThread;     myThread.start();     return a.exec(); }

: error: collect2: ld returned 1 exit status
: undefined reference to `vtable for MyThread'

[解决办法]
用到了：Q_OBJECT宏，就要老老实实的按照要求来写代码。
这个程序要分成3个文件。
MyThread.h
MyThread.cpp
main.cpp
否则不会被正确编译。