C++ 在Qt中打开第二个窗口

我正在尝试使用Qt-Creator编译用C++编写的代码。我正在尝试创建第二个窗口，该窗口将在单击主窗口中的菜单项后显示，该窗口应具有单独的.ui文件。但是在编译过程中，我得到了这个错误：

/home/martin/Code/C++/Map_generator/map_generator/preferenceswindow.cpp:4: error: prototype for 'Ui::PreferencesWindow::PreferencesWindow(QWidget*)' does not match any in class 'Ui::PreferencesWindow'
 Ui::PreferencesWindow::PreferencesWindow(QWidget *parent)
 ^

/home/bo/Code/C++/Map_generator/build-map_generator-Desktop-Debug/ui_preferenceswindow.h:88: error: candidates are: constexpr Ui::PreferencesWindow::PreferencesWindow(Ui::PreferencesWindow&&)
     class PreferencesWindow: public Ui_PreferencesWindow {};
           ^

有什么不对劲吗

优先权

#ifndef PREFERENCESWINDOW_H
#define PREFERENCESWINDOW_H

#include <QWidget>

namespace Ui
{
    class PreferencesWindow;
}

class PreferencesWindow : public QWidget
{
    Q_OBJECT
public:
    explicit PreferencesWindow(QWidget *parent = 0);

signals:

//public Q_SLOTS:
private:
    PreferencesWindow *uip;
};    
#endif // PREFERENCESWINDOW_H

preferenceswindow.ui文件

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>PreferencesWindow</class>
 <widget class="QWidget" name="PreferencesWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>326</width>
    <height>159</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <widget class="QPushButton" name="pushButton">
   <property name="geometry">
    <rect>
     <x>200</x>
     <y>100</y>
     <width>99</width>
     <height>27</height>
    </rect>
   </property>
   <property name="text">
    <string>Save</string>
   </property>
  </widget>
  <widget class="QSpinBox" name="spinBox">
   <property name="geometry">
    <rect>
     <x>90</x>
     <y>100</y>
     <width>81</width>
     <height>27</height>
    </rect>
   </property>
   <property name="minimum">
    <number>1</number>
   </property>
   <property name="maximum">
    <number>200</number>
   </property>
   <property name="value">
    <number>15</number>
   </property>
  </widget>
  <widget class="QSpinBox" name="spinBox_2">
   <property name="geometry">
    <rect>
     <x>90</x>
     <y>20</y>
     <width>81</width>
     <height>27</height>
    </rect>
   </property>
   <property name="minimum">
    <number>1</number>
   </property>
   <property name="maximum">
    <number>1000</number>
   </property>
   <property name="value">
    <number>100</number>
   </property>
  </widget>
  <widget class="QSpinBox" name="spinBox_3">
   <property name="geometry">
    <rect>
     <x>90</x>
     <y>60</y>
     <width>81</width>
     <height>27</height>
    </rect>
   </property>
   <property name="minimum">
    <number>1</number>
   </property>
   <property name="maximum">
    <number>1000</number>
   </property>
   <property name="value">
    <number>60</number>
   </property>
  </widget>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>20</x>
     <y>30</y>
     <width>67</width>
     <height>17</height>
    </rect>
   </property>
   <property name="text">
    <string>Columns</string>
   </property>
  </widget>
  <widget class="QLabel" name="label_2">
   <property name="geometry">
    <rect>
     <x>20</x>
     <y>70</y>
     <width>67</width>
     <height>17</height>
    </rect>
   </property>
   <property name="text">
    <string>Rows</string>
   </property>
  </widget>
  <widget class="QLabel" name="label_3">
   <property name="geometry">
    <rect>
     <x>20</x>
     <y>110</y>
     <width>67</width>
     <height>17</height>
    </rect>
   </property>
   <property name="text">
    <string>Grid Size</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

优先权
0
0
326
159
形式
200
100
99
27
拯救
90
100
81
27
1.
200
15
90
20
81
27
1.
1000
100
90
60
81
27
1.
1000
60
20
30
67
17
柱
20
70
67
17
排
20
110
67
17
网格大小

当您希望将uip变量声明为

PreferencesWindow

时，您的uip变量将声明为

Ui:：PreferencesWindow

：

private:
    PreferencesWindow *uip;

换成

private:
    Ui::PreferencesWindow *uip;

您还在PreferencesWindow.cpp中定义

Ui:：PreferencesWindow

构造函数。这不是你想做的。您想在那里定义

首选项swindow

构造函数。像这样：

PreferencesWindow::PreferencesWindow(QWidget *parent)
    :QWidget(parent), uip(new Ui::PreferencesWindow)
{
    uip->setupUi(this);
}

PreferencesWindow::PreferencesWindow(QWidget *parent)
    :QWidget(parent), uip(new Ui::PreferencesWindow)
{
    uip->setupUi(this);
}