QT编译出错：expected unqualified-id before'.'token

Question

出错位置：
void MainWindow::on_pushButton_clicked()
{
this->close();
detectingwindow.show();//出错
detectingwindow.exec();//出错
this->show();
}
这个程序段是mainwindow.cpp里的，我开头有#include "mainwindow.h"，在mainwindow.h里有#include "detectingwindow.h"，detecting.h内容如下：
#ifndef DETECTINGWINDOW_H
#define DETECTINGWINDOW_H

#include <QWidget>

namespace Ui {
class detectingwindow;
}

class detectingwindow : public QWidget
{
Q_OBJECT

public:
explicit detectingwindow(QWidget *parent = 0);
~detectingwindow();

private:
Ui::detectingwindow *ui;
};

#endif // DETECTINGWINDOW_H

Answer 1

detectingwindow的声明和定义在哪？

detectingwindow* pwin = new detectingwindow();

pwin->show();
pwin->exec();本回答被提问者采纳

Answer 2

detectingwindow是个类不是对象名，没定义