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  4. Invalid use of incomplete type; forward declaration of struct.....from auto-generated code
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Invalid use of incomplete type; forward declaration of struct.....from auto-generated code

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  • T Offline
    T Offline
    tesmai4
    wrote on 18 Jul 2014, 11:41 last edited by
    #1

    Dear all,

    I created a "QWizardPage form class" in my project. I get the following errors from the auto-generated code:

    registerwizardpage.cpp: In constructor 'RegisterWizardPage::RegisterWizardPage(QWidget*)':
    registerwizardpage.cpp:6: error: invalid use of incomplete type 'struct Ui::RegisterWizardPage'
    registerwizardpage.h:7: error: forward declaration of 'struct Ui::RegisterWizardPage'
    registerwizardpage.cpp:8: error: invalid use of incomplete type 'struct Ui:RegisterWizardPage'
    registerwizardpage.h:7: error: forward declaration of 'struct Ui::RegisterWizardPage'
    registerwizardpage.cpp: In destructor 'virtual RegisterWizardPage::~RegisterWizardPage()':
    registerwizardpage.cpp:13: warning: possible problem detected in invocation of delete operator:
    registerwizardpage.cpp:13: warning: invalid use of incomplete type 'struct Ui::RegisterWizardPage'
    registerwizardpage.h:7: warning: forward declaration of 'struct Ui::RegisterWizardPage'

    Any help for resolving this error please.

    RegisterWizardPage.h

    @#ifndef REGISTERWIZARDPAGE_H
    #define REGISTERWIZARDPAGE_H

    #include <QWizardPage>

    namespace Ui {
    class RegisterWizardPage;
    }

    class RegisterWizardPage : public QWizardPage
    {
    Q_OBJECT

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

    private:
    Ui::RegisterWizardPage *ui;
    };

    #endif // REGISTERWIZARDPAGE_H
    @

    RegisterWizardPage.cpp

    @#include "registerwizardpage.h"
    #include "ui_registerwizardpage.h"

    RegisterWizardPage::RegisterWizardPage(QWidget *parent) :
    QWizardPage(parent),
    ui(new Ui::RegisterWizardPage)
    {
    ui->setupUi(this);
    }

    RegisterWizardPage::~RegisterWizardPage()
    {
    delete ui;
    }
    @

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    • D Offline
      D Offline
      dheerendra
      Qt Champions 2022
      wrote on 18 Jul 2014, 12:03 last edited by
      #2

      Hope you did not change the objectName of Wizard in Designer.

      In order to check this, can you create new project for the same type of wizard and don't change any parameters/properties in designer form.
      Now compile and run. See if you observe the same errors.

      Dheerendra
      @Community Service
      Certified Qt Specialist
      http://www.pthinks.com

      1 Reply Last reply
      0
      • T Offline
        T Offline
        tesmai4
        wrote on 18 Jul 2014, 12:10 last edited by
        #3

        Thanks for your reply.

        I did change the objectName of QWizard instance in QT Designer. I did not change any parameters.
        I did clean my project and executed QMake before build all.
        How can I correct/avoid this error?

        Why and how is it important to not the change name of QWizard in designer?

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        0
        • D Offline
          D Offline
          dheerendra
          Qt Champions 2022
          wrote on 18 Jul 2014, 13:52 last edited by
          #4

          Following code snippet depends on objectName

          @namespace Ui {
          class WizardPage;
          }

          and

          private:
          Ui::WizardPage *ui;
          @

          Dheerendra
          @Community Service
          Certified Qt Specialist
          http://www.pthinks.com

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          0
          • T Offline
            T Offline
            tesmai4
            wrote on 18 Jul 2014, 14:13 last edited by
            #5

            Thanks for your reply. Problem solved.

            Could you please have a look at this "issue":https://qt-project.org/forums/viewthread/45125/

            Regards,

            1 Reply Last reply
            0

            2/5

            18 Jul 2014, 12:03

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