Ошибка invalid use of incomplete type class ui mainwindow

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• C:UsersLorence30Desktoptestmainwindow.h:32: error: invalid use of incomplete type ‘class Ui::MainWindow’ ui->grassyTile
  ^

  why i keep getting this error?

  I have my Q_OBJECT macro inside the MainWindow class.

  *[link text](link url) class MainWindow : public QMainWindow
  {
  Q_OBJECT

  public:
  explic[it MainWindow(QWidget *parent = 0);
  ~MainWindow();](link url)

  private slots:
  void changeTile();
  void pushTile();

  private:
  Ui::MainWindow *ui;
  int counter;

  std::array<Tile,1> tile_list
  {
      ui->grassyTile // heres where error coming from
  };
  

  };

  ---

• @Lorence said:

  grassyTile

  What type is that ?

  «use of incomplete type» often means a include file is missing
  or you forwarded a class
  like
  class SomeClass;

  And try to use it in a context where it needs to be fully defined.
  Like adding to some template lists.

  Not sure what you tried to define here ?

  std::array<Tile,1> tile_list <—- ; missing here?
  {
  ui->grassyTile // heres where error coming from
  };

  ---

• grassyTile is of type Tile that is inheriting QLabel

  Not sure what you tried to define here ?
  i dont know how to list intialize an array on constructor so i decided to do it in side a class definition

  ---

• @mrjj said:

  and «tile.h» is included ?
  in mainwindow.h

  do you mean like ?
  std::array<std::string, 2> strings = {{ «a», «b» }};

  ---

• and «tile.h» is included ?

  yes i got all i need included.

  do you mean like ?
  std::array<std::string, 2> strings = {{ «a», «b» }};

  yes, in the mainwindow.cpp i can freely use ui->grassyTile; without error.

  ---

• @Lorence
  Ok so it must be the tile_list statement.

  Would it like
  std::array<Tile,1> tile_list {{ui->grassyTile }};

  ---

• Would it like
  std::array<Tile,1> tile_list {{ui->grassyTile }};

  thanks for the help but i still get the same error

  ---

• @Lorence
  Ok, and you are 100% it knows the tile type here?
  you can declare one over the tile_list and it will like it ?
  Tile *Test;

  One thing I wonder, you say
  std::array<Tile> and not std::array<Tile *) or & so it must make a copy of
  it (the tile). Is that the effect you want?

  ---

• ---

• @Lorence
  Hmm it seems its «ui» it do not like.
  Let me test.

  ---

• @mrjj
  ahh, Ui::MainWindow is defined in
  #include «ui_main_window.h»
  which is included in the CPP file so the type is not fully defined so you cannot say
  ui->Somename
  as Ui::MainWindow is not defined yet.

  moving
  #include «ui_main_window.h»
  to the minwin.h file allows it but not sure if it will confuse Qt Creator.

  Also it will complain about not being able to convert Tile to Tile * as list is not pointers and ui->grassyTile will be.

  ---

• ahh, Ui::MainWindow is defined in
  #include «ui_main_window.h»

  didnt think of that, thanks! but new error comes

  View post on imgur.com

  ---

• @Lorence

  Yeah, it tries to construct a new Tile to go into the list.

  Can I ask if you want a list of pointers to tiles you have on screen or
  a list with new Tiles that has nothing to do with those on screen?

  ---

• sorry for the late reply.

  i just want a list of tiles to choose from.

  but QT disabled the copying of QLabel,
  so i really need to have a pointer of tiles?

  ---

• @Lorence
  heh 9 mins is not considered late

  then the list must be pointer type or it will be new ones and not the ones on screen.

  so
  std::array<Tile> should be std::array<Tile *> or std::array<Tile &>
  so its the ones on screen and not new ones
  Yes you must at least use & as it must «point» to the real one.

  ---

• then the list must be pointer type
  yea, i edited my last reply

  it will be new ones and not the ones on screen.

  it is the ones on the screen, there will be a list of tiles on the screen and the user will choose what tiles they want to render

  *so
  std::array<Tile> should be std::array<Tile > or std::array<Tile &>
  so its the ones on screen and not new ones
  Yes you must at least use & as it must «point» to the real one.

  thanks!!!!!!!!

  all my problem is fixed I have not coded for weeks and C++ is already kicking me damit

  ---

• @mrjj said:
  ok. Super

  and tile_list is the ones to choose from ?

  Dont worry. I programmed c++ for 20 years and it still kicks me

  ---

• and tile_list is the ones to choose from ?

  yes, it is a list of Tile which is inheriting QLabel

  Dont worry. I programmed c++ for 20 years and it still kicks me

  woaaaaa, me is about a year, and started this QT last week, i choose this for my tile engine’s interface from SFML, i still have more ways to go !^_^

  ---

• @Lorence said:
  welcome on board to Qt. its a nice frame work.

  Oh so its some sort of game editor your are making ?

  ---

• welcome on board to Qt. its a nice frame work.

  Yes my first choice is wxwidget and windows form application, but signals and slots mechanism of qt makes me decide to choose qt

  Oh so its some sort of game editor your are making ?
  yes exatcly, like the rpg maker vx ace of steam

  ---

• @Lorence
  Well IMHO Qt is more feature rich than wxwidget even I did like that also.

  Oh. Wow. thats a huge project. !
  So its an editor and and tile engine for making tile games. Pretty cool.

  ---

• Well IMHO Qt is more feature rich than wxwidget even I did like that also.
  yea, in other forum’s debation, QT always win, whats IMHO?

  Oh. Wow. thats a huge project. !
  yes this is a huge project for me XD,
  and i still got no idea about integrating script language into this project

  ---

• @Lorence
  IMHO = In my humble opinion
  Well I tested both and choose Qt.

  Would also be huge for me to make as single person if we are talking full
  game editor and engine

  I would have a good look at http://doc.qt.io/qt-5/qtscript-index.html
  Should be fast enough and quite easy to mix c++ and script.

  ---

• I see

  Im planning to finish this as in 100%

  I would have a good look at http://doc.qt.io/qt-5/qtscript-index.html
  Should be fast enough and quite easy to mix c++ and script.

  thanks!

  We have group on skype do you want to join?

  ---

• @Lorence
  ok. to make it a full product? To sell or make games and sell ?

  — We have group on skype do you want to join?
  Oh thanks for the offer but I only use skype at work as I sit in the living room and
  taking in mics drives the others crazy
  So no Team Speak for me either

  So you are a group of people making this?

  ---

• ok. to make it a full project ? To sell or make games and sell ?
  I want to sell the whole project. i dont want wasting time doing things that is unrelated to programming so i dont want to make games and sell.

  okay i see np.

  So you are a group of people making this?
  No im the only one making this. the skype group is a group of programmers experts and newbies. just for teaching things

  ---

• @Lorence
  Ok, a game maker product.
  You should also consider how to handle support.
  Takes more time than one realizes.

  Ah, that way. Did not know skype has such forums/groups.

  Really good luck with it.

  ---

• yea thanks.

  Ah, that way. Did not know skype has such forums/groups.
  oh no, im really bad at explaining things. i mean
  you can create a conversation group in skype and invite people as many as you can. so i just found this group and then i joined

  okay thanks again

  ---

• my friends,i had a similar case and found this happens when you mix different versions of Qt to compile the project
  they simply change the ui_*.h files or sometimes they empty it and thus this happens. Occured at least with me ..

  ---

• @mrjj Thanks, you are right for saying that some header files might be missing.

  ---

• Forum
• Beginners
• Invalid use of incomplete type

Invalid use of incomplete type

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#ifndef ADDDIALOG_H #define ADDDIALOG_H #include <QDialog> namespace Ui { class AddDialog; } class AddDialog : public QDialog { Q_OBJECT public: explicit AddDialog(QWidget *parent = 0); ~AddDialog(); private: Ui::AddDialog *ui; }; #endif // ADDDIALOG_H 

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#include "addDialog.h" #include "ui_addDialog.h" AddDialog::AddDialog(QWidget *parent) : QDialog(parent), ui(new Ui::AddDialog) { ui->setupUi(this); } AddDialog::~AddDialog() { delete ui; } 

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#ifndef GPA_H #define GPA_H #include <QMainWindow> namespace Ui { class Gpa; } class Gpa : public QMainWindow { Q_OBJECT public: explicit Gpa(QWidget *parent = 0); ~Gpa(); private slots: void on_pushButton_3_clicked(); private: Ui::Gpa *ui; }; #endif // GPA_H 

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#include "gpa.h" #include "ui_gpa.h" Gpa::Gpa(QWidget *parent) : QMainWindow(parent), ui(new Ui::Gpa) { ui->setupUi(this); } Gpa::~Gpa() { delete ui; }

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Я пытался решить эту проблему, но должно быть какое-то недопонимание в том, как я понимаю предварительную декларацию.

Я получаю следующую ошибку:

src/algorithm.cpp: In constructor ‘Algorithm::Algorithm(MainWindow*)’: src/algorithm.cpp:22:20: error: invalid use of incomplete type ‘struct Ui::MainWindow’ src/mainwindow.h:23:10: error: forward declaration of ‘struct Ui::MainWindow’ 

У меня есть эти файлы (я пропустил некоторые строки и файлы и вставил только соответствующий код):

algorithm.cpp

#include "algorithm.h"#include "mainwindow.h" Algorithm::Algorithm(MainWindow *mainWindow) { this->mainWindow = mainWindow; QAction *action = new QAction(this); action->setObjectName(QStringLiteral("action")); action->setText(this->getName()); mainWindow->m_ui->menuAlgorithms->addAction(action); mainWindow->connect(action, SIGNAL(triggered()), this, SLOT(this->start())); } 

algorithm.h

#ifndef ALGORITHM_H #define ALGORITHM_H #include <QObject> #include "graphwidget.h"#include "edge.h"#include "vertex.h" class MainWindow; class Algorithm : public QObject { public: MainWindow *mainWindow; Algorithm(MainWindow *mainWindow); void start(); virtual void solve(); virtual QString getDescription(); virtual QString getName(); }; 

mainwindow.cpp

#include "mainwindow.h"#include "algorithm.h"#include "../ui/ui_mainwindow.h"#include "vertex.h"#include "edge.h"#include "warning.h" mode_type mode; MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), m_ui(new Ui::MainWindow) { gundirected = NULL; gdirected = NULL; m_ui->setupUi(this); ... 

mainwindow.h

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include <QSystemTrayIcon> #include <QSignalMapper> #include <QUndoView> #include <QGraphicsView> #include <QGraphicsScene> #include <QKeyEvent> #include <QGraphicsSceneMouseEvent> #include <QLabel> #include <QVBoxLayout> #include <QPushButton> #include "graphwidget.h" enum mode_type {NORMAL, VERTEX, EDGE}; // vyctovy typ pro urceni editoacniho modu extern mode_type mode; namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); Ui::MainWindow *m_ui; ... 

4

Проблема в вашем коде в том, что вы пытаетесь использовать m_ui член MainWindow класс в вашем Algorithm класс и тип m_ui является Ui::MainWindow, но твой Algorithm класс не знает о таком типе. Вы можете решить эту проблему, включив ui_mainwindow.h в вашем algorithm.cpp,

Но это все еще плохой дизайн. m_ui должен быть частным членом MainWindow учебный класс. Вы не должны получать к нему доступ из других классов. Вместо этого создайте функции в вашем MainWindow класс, который позволит вам делать то, что вы хотите.

Например, создайте публичную функцию следующим образом:

void MainWindow::addCustomAction(QAction *action) { m_ui->menuAlgorithms->addAction(action); } 

Затем вызовите эту функцию из вашего Algorithm учебный класс:

Algorithm::Algorithm(MainWindow *mainWindow) { this->mainWindow = mainWindow; QAction *action = new QAction(this); action->setObjectName(QStringLiteral("action")); action->setText(this->getName()); mainWindow->addCustomAction(action); connect(action, SIGNAL(triggered()), this, SLOT(start())); } 

4

Ваша предварительная декларация появляется в пространстве имен UI, но объявление вашего класса появляется за пределами этого пространства имен. Вы должны изменить это на

 namespace UI { class MainWindow : public QMainWindow { Q_OBJECT // ... }; } 

Также кажется, что вам вообще не нужно предоставлять предварительную декларацию, но измените предварительную декларацию в Algorithm.h снова появиться MainWindow в правильном пространстве имен:

 namespace UI { class MainWindow; } 

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1. 1. Project structure
2. 2. Exterior windows
3. 3. main.cpp
4. 4. mainwindow.h
5. 5. mainwindow.cpp
6. 6. anotherwindow.h
7. 7. anotherwindow.cpp
8. 8. Result. Switch between windows
9. 9. Video