Question

我不断收到错误错误：未定义引用＆＃39;同时努力学习在Qt中发展。该程序旨在通过线程GUI进行练习并使用此信号和插槽功能。

标题文件：

mythread.h

 #ifndef MYTHREAD_H
 #define MYTHREAD_H
 #include <QObject>
 #include <QThread>
 class MyThread : public QThread
 {
    Q_OBJECT
  public:
     MyThread(QObject *parent = 0);
    ~MyThread();
  void run();
    bool Stop;
  signals:
     void numberchange(int);
 };

 #endif // MYTHREAD_H

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "mythread.h"

namespace Ui {
   class MainWindow;
}

class MainWindow : public QMainWindow
{
     Q_OBJECT

 public:
      explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();
     MyThread *mthread;
private slots:
      void on_startbtn_clicked();
      void onNumberChange(int);
      void on_stop_clicked();
private:
      Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

源文件： mythread.cpp

#include "mythread.h"
#include <QMutex>

MyThread::MyThread(QObject *parent): QThread(parent)
{
   Stop = true;
}

MyThread::~MyThread()
{

}

void MyThread::run()
{
    QMutex mutex;
    static int i = 0;
    for(;i < 10000; i++)
    {
        mutex.lock();
        if(this->Stop)
            break;
        mutex.unlock();
        emit numberchange(i);
        this->msleep(1000);
    }
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "mythread.h"
#include <QString>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    mthread = new MyThread(this);
    connect(mthread, &MyThread::numberchange, this,         &MainWindow::onNumberChange); // I get an error on this line for the numberchanged function, both numberchange and onNumberChange have the same arguments
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_startbtn_clicked()
{
   mthread->start();
}

void MainWindow::on_stop_clicked()
{
    mthread->Stop = false;
}

void MainWindow::onNumberChange(int number)
{
    ui->label->setText(QString::number(number));
}

错误：

C:\Qt\Tools\QtCreator\bin\Threaded_GUI\mainwindow.cpp:12: error: undefined reference to `MyThread::numberchange(int)'
C:\Qt\5.4\mingw491_32\include\QtCore\qobject.h:239: error: undefined reference to `MyThread::staticMetaObject'
C:\Qt\Tools\QtCreator\bin\Threaded_GUI\mythread.cpp:4: error: undefined reference to `vtable for MyThread'
C:\Qt\Tools\QtCreator\bin\Threaded_GUI\mythread.cpp:9: error: undefined reference to `vtable for MyThread'
C:\Qt\Tools\QtCreator\bin\Threaded_GUI\mythread.cpp:24: error: undefined reference to `MyThread::numberchange(int)'
collect2.exe:-1: error: error: ld returned 1 exit status

我不知道为什么我在第一次

中的连接功能时出现错误

Qt＆＃39;未定义参考＆＃39;功能？

0 个答案: