Stuck in this Error :::invalid use of incomplete type ‘class Ui::Dialog’ ui(new Ui::Dialog) ^~~~~~

[sankarapandiyan]

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"
#include <QProgressDialog>
#include <QDebug>
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
}
Dialog::~Dialog()
{
    delete ui;
}
void Dialog::on_modalButton_clicked()
{
    int numTasks = 100000;
    QProgressDialog progress("Task in progress...", "Cancel", 0, numTasks, this);
    progress.setWindowModality(Qt::WindowModal);
    for (int i = 0; i < numTasks; i++) {
        progress.setValue(i);
       if (progress.wasCanceled())
            break;
    }
    progress.setValue(numTasks);
}
void Dialog::on_modelessButton_clicked()
{
    myTask = new MyTask;
}

[Christian Ehrlicher]

So how did you name you widget in the designer? Looking into ui_dialog.h will show you that it's at least not 'Dialog'

[jsulm]

@sankarapandiyan Do you use qmake?
Did you check whether ui_dialog.h contains Dialog class inside Ui namespace?

[J.Hilk]

@sankarapandiyan nobody will be able to find the error here, show us your header file

also pls use the code tag to display code:

[sankarapandiyan]

@Christian-Ehrlicher in designer i have used only Dialog , then why its shows the error , please give some suggestion to fix this error

[sankarapandiyan]

@J-Hilk YEs i have done it .please give me some suggestion about the error

[jsulm]

@sankarapandiyan He asked you to post the code...

[sankarapandiyan]

@jsulm sure check it

[sankarapandiyan]

@J-Hilk I have done it

[jsulm]

@sankarapandiyan said in Stuck in this Error :::invalid use of incomplete type ‘class Ui::Dialog’ ui(new Ui::Dialog) ^~~~~~:

I have done it

Where? I can't see the code from your header files anywhere...

[sankarapandiyan]

@jsulm i have done

[jsulm]

@sankarapandiyan Sorry, but I can't see it anywhere...

[J.Hilk]

@sankarapandiyan neither can I

[mrjj]

Hi
Please also show

dialog.h

and most important

ui_dialog.h

[sankarapandiyan]

@mrjj

``

i have included #include <ui_dialog.h> in dialog.h 



#ifndef DIALOG_H
#define DIALOG_H


#include <QDialog>
#include "mytask.h"
#include <ui_dialog.h>
namespace Ui {
class Dialog;
}
 but the error remains the same   /home/adx-soft1/Desktop/Sankarapandiyan/ProgDial/dialog.cpp:10: error: invalid use of incomplete type ‘class Ui::Dialog’
     ui(new Ui::Dialog)
                ^~~~~~



this is my dialog.h 


#ifndef DIALOG_H
#define DIALOG_H


#include <QDialog>
#include "mytask.h"
#include <ui_dialog.h>



namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

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

private slots:
    void on_modalButton_clicked();

    void on_modelessButton_clicked();

private:
    Ui::Dialog *ui;
    MyTask *myTask;
};

#endif // DIALOG_H

[jsulm]

@sankarapandiyan Can you please simply provide the content of ui_dialog.h? This is what we are asking all the time.

[sankarapandiyan]

@jsulm [url=https://postimg.cc/tZyZdZ4R][img]https://i.postimg.cc/tZyZdZ4R/Screenshot-from-2019-10-31-13-33-16.png[/img][/url]

[url=https://postimg.cc/rd5RtCcY][img]https://i.postimg.cc/rd5RtCcY/Screenshot-from-2019-10-31-13-33-28.png[/img][/url]

[jsulm]

@sankarapandiyan This is not what we asked you to provide!
AGAIN: post the content of ui_dialog.h ! It is a normal C++ header file, so symply copy its text and post it here directly...

[sankarapandiyan]

@jsulm ```
code_text

#define DIALOG_H

#include <QDialog>
#include<QTimer>
#include<QProgressDialog>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
public slots:
    void myfunction();
    void perform();
    void cancel();

private:
    Ui::Dialog *ui;
    int steps;
    QProgressDialog*pd;
    QTimer*timer;
};

#endif // DIALOG_H
This is the hedder file of dialog.h

[jsulm]

@sankarapandiyan Sorry I will stop here as I'm tired to explain that you simply need to copy text from ui_dialog.h and paste it here...

[sankarapandiyan]

@jsulm i didnt have a content of ui dialog . h , And i am having dialog.h file only is there thats why i have uploaded repeatedly

[J.Hilk]

@sankarapandiyan
it will not be inside QtCreator as it is a automatically created file.

But you will find in in your build directory, if you use a normal file explorer, the one that comes with your operating system

[sankarapandiyan]

This post is deleted!

[mrjj]

@sankarapandiyan
Nope thats the actual UI file
its
ui_dialog.h
we are after to see if its broken somehow.
Its auto generated file and lives in the build folder
not in project folder.

[sankarapandiyan]

Thanks a lot ... @mrjj ... Finally ,Here there is a code of ui.dialog.h file , @J-Hilk @jsulm

** Form generated from reading UI file 'dialog.ui'
**
** Created by: Qt User Interface Compiler version 5.10.1
**
** WARNING! All changes made in this file will be lost when recompiling UI file!
********************************************************************************/

#ifndef UI_DIALOG_H
#define UI_DIALOG_H

#include <QtCore/QVariant>
#include <QtWidgets/QAction>
#include <QtWidgets/QApplication>
#include <QtWidgets/QButtonGroup>
#include <QtWidgets/QDialog>
#include <QtWidgets/QGridLayout>
#include <QtWidgets/QHeaderView>
#include <QtWidgets/QPushButton>
#include <QtWidgets/QSpacerItem>

QT_BEGIN_NAMESPACE

class Ui_Dialog
{
public:
    QGridLayout *gridLayout;
    QPushButton *pushButton;
    QPushButton *modelessButton;
    QPushButton *modalButton;
    QSpacerItem *verticalSpacer;

    void setupUi(QDialog *Dialog)
    {
        if (Dialog->objectName().isEmpty())
            Dialog->setObjectName(QStringLiteral("Dialog"));
        Dialog->resize(304, 95);
        gridLayout = new QGridLayout(Dialog);
        gridLayout->setSpacing(6);
        gridLayout->setContentsMargins(11, 11, 11, 11);
        gridLayout->setObjectName(QStringLiteral("gridLayout"));
        pushButton = new QPushButton(Dialog);
        pushButton->setObjectName(QStringLiteral("pushButton"));

        gridLayout->addWidget(pushButton, 2, 1, 1, 1);

        modelessButton = new QPushButton(Dialog);
        modelessButton->setObjectName(QStringLiteral("modelessButton"));

        gridLayout->addWidget(modelessButton, 0, 1, 1, 1);

        modalButton = new QPushButton(Dialog);
        modalButton->setObjectName(QStringLiteral("modalButton"));

        gridLayout->addWidget(modalButton, 0, 0, 1, 1);

        verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);

        gridLayout->addItem(verticalSpacer, 1, 1, 1, 1);


        retranslateUi(Dialog);
        QObject::connect(pushButton, SIGNAL(clicked()), Dialog, SLOT(close()));

        QMetaObject::connectSlotsByName(Dialog);
    } // setupUi

    void retranslateUi(QDialog *Dialog)
    {
        Dialog->setWindowTitle(QApplication::translate("Dialog", "QProgressDialog Launcher", nullptr));
        pushButton->setText(QApplication::translate("Dialog", "Cancel", nullptr));
        modelessButton->setText(QApplication::translate("Dialog", "Modeless", nullptr));
        modalButton->setText(QApplication::translate("Dialog", "Modal", nullptr));
    } // retranslateUi

};

namespace Ui {
    class Dialog: public Ui_Dialog {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_DIALOG_H
code_text

[jsulm]

@sankarapandiyan OK, the file looks good.
Try to do a complete rebuild:

• Delete the content of the build directory
• Run qmake
• And build

[sankarapandiyan]

Yes it Run Thanks a Lot ..